component
ACS709LLFTR-35BB-T
Public Made by Adomby adom
Allegro MicroSystems, LLC Current Sensors, QSOP-24. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ACS709LLFTR-35BB-T
Allegro MicroSystems, LLC · Current Sensors · QSOP-24
ACS709LLFTR-35BB-T from Allegro MicroSystems, LLC, in a QSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 2 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 3 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 4 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 5 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 6 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 7 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 8 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 9 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 10 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 11 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 12 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 13 | NC | unconnected | No connection. |
| 14 | NC | unconnected | No connection. |
| 15 | GND | power_in | Device ground connection. |
| 16 | VZCR | output | Voltage reference output pin giving a zero-current (0 A) reference whose output voltage scales with VCC. |
| 17 | FILTER | passive | Filter pin; connect an external capacitor from this pin to GND to set the device bandwidth. |
| 18 | VIOUT | output | Analog output pin whose output voltage is proportional to the current flowing through the loop between the IP+ and IP- pins. |
| 19 | FAULT | output | Overcurrent Fault pin that transitions to a logic low state when the current between the IP+ and IP- pins exceeds the overcurrent fault threshold. |
| 20 | VCC | power_in | Supply voltage pin. |
| 21 | VOC | input | Overcurrent Input pin; the analog input voltage on this pin sets the overcurrent fault threshold. |
| 22 | FAULT_EN | input | Fault enable pin that enables overcurrent faulting when high and resets the FAULT output when low. |
| 23 | NC | unconnected | No connection. |
| 24 | NC | unconnected | No connection. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Allegro MicroSystems, LLC |
| Package | QSOP-24 |
| Category | Sensors |
| Pins | 24 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3 | 5.5 | V | 4 | ||
| Output Capacitance Load | CLOAD | 10 | nF | VIOUT pin to GND | 4 | ||
| Output Resistive Load | RLOAD | 10 | kΩ | VIOUT pin to GND | 4 | ||
| Supply Current | ICC | 11 | 14.5 | mA | VIOUT open, FAULT pin high, VCC = 5 V (all versions but -6BB) | 4 | |
| Full Range Linearity | ELIN | -0.75 | 0.75 | % | IP = ±IP0A | 4 | |
| Symmetry | ESYM | 99.1 | 100 | 100.9 | % | IP = ±IP0A | 4 |
| Setting Voltage for Overcurrent Switch Point | VOC | 0.25 | 0.4 | V | 4 | ||
| Signal Noise at Overcurrent Comparator Input | INCOMP | -1 | 1 | A | 4 | ||
| Overcurrent Fault Switch Point Error | EOC | -5 | 5 | % | Switch point in VOC safe operating area; assumes INCOMP = 0 A | 4 | |
| Overcurrent FAULT Pin Output Voltage | VFAULT | 0.4 | V | 1 mA sink current at FAULT pin | 4 | ||
| Fault Enable (FAULT_EN Pin) Input Low Voltage Threshold | VIL | 0.1 | V | 4 | |||
| Fault Enable (FAULT_EN Pin) Input High Voltage Threshold | VIH | 0.8 | V | 4 | |||
| Overcurrent Input Pin Resistance | ROC | 2 | MΩ | TA = 25°C, VOC pin to GND | 5 | ||
| Voltage Reference Output Load Current (source) | IZCR | 3 | mA | Source current | 5 | ||
| Voltage Reference Output Load Current (sink) | IZCR | 50 | µA | Sink current | 5 | ||
| Voltage Reference Output Drift | ΔVZCR | -10 | 10 | mV | 5 | ||
| Optimized Accuracy Range | IP(OA) | -37.5 | 37.5 | A | X35BB (VCC = 5 V) | 7 | |
| Linear Sensing Range | IP(LIN) | -75 | 75 | A | X35BB (VCC = 5 V) | 7 | |
| Sensitivity | Sens | 27 | 29.5 | mV/A | IP = 25 A, TA = 25°C to 150°C | 7 | |
| Electrical Offset Voltage | VOE | -5 | 5 | mV | IP = 0 A, TA = 25°C | 7 | |
| Electrical Offset Voltage | VOE | -25 | 25 | mV | IP = 0 A, TA = 25°C to 150°C | 7 | |
| Electrical Offset Voltage | VOE | -40 | 40 | mV | IP = 0 A, TA =, 40°C to 25°C | 7 | |
| Total Output Error | ETOT | -3 | 3 | % | Tested at IP = 25 A, IP applied for 5 ms, TA = 25°C to 150°C | 7 | |
| Supply Voltage (absolute maximum) | VCC | 8 | V | 2 | |||
| Filter Pin Voltage | VFILTER | 8 | V | 2 | |||
| Analog Output Pin Voltage | VIOUT | 32 | V | 2 | |||
| Overcurrent Input Pin Voltage | VOC | 8 | V | 2 | |||
| Overcurrent Fault Pin Voltage | VFAULT | 8 | V | 2 | |||
| Fault Enable Pin Voltage | VFAULTEN | 8 | V | 2 | |||
| Voltage Reference Output Pin Voltage | VZCR | 8 | V | 2 | |||
| DC Reverse Voltage (supply, filter, analog output, overcurrent input, overcurrent fault, fault enable, voltage reference output pins) | VRdcx | -0.5 | V | 2 | |||
| Output Current Source | IIOUT(Source) | 3 | mA | 2 | |||
| Output Current Sink | IIOUT(Sink) | 1 | mA | 2 | |||
| Operating Ambient Temperature Range L | TA | -40 | 150 | °C | Range L | 2 | |
| Junction Temperature | TJ(max) | 165 | °C | 2 | |||
| Storage Temperature | Tstg | -65 | 170 | °C | 2 | ||
| Steady State Package Thermal Resistance | RθJA | 21 | °C/W | Tested with 30 A DC current, ACS709 demo board in 1 cu. ft. of still air | 8 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | 1 through 6 IP+ Sensed current copper conduction path pins. Terminals for current being sensed; | 3 |
CAD (KiCad official)
- Symbol:
ACS709LLFTR-35BB-T - Footprint:
Package_SO:QSOP-24_3.9x8.7mm_P0.635mm - 3D model: QSOP-24 (KiCad packages3D, STEP)
- 3D model files:
acs709llftr-35bb-t-etched.step/acs709llftr-35bb-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);acs709llftr-35bb-t.step/acs709llftr-35bb-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Allegro MicroSystems, LLC datasheet (21 pp, sha256
28234f2ddfd5160e, retrieved 2026-10-31, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).
# ACS709LLFTR-35BB-T
**Allegro MicroSystems, LLC** · Current Sensors · QSOP-24
ACS709LLFTR-35BB-T from Allegro MicroSystems, LLC, in a QSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 2 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 3 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 4 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 5 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 6 | IP+ | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP- pins, with unidirectional or bidirectional current flow. |
| 7 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 8 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 9 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 10 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 11 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 12 | IP- | passive | Sensed current copper conduction path pin; terminal for the current being sensed, fused internally and looped to the IP+ pins, with unidirectional or bidirectional current flow. |
| 13 | NC | unconnected | No connection. |
| 14 | NC | unconnected | No connection. |
| 15 | GND | power_in | Device ground connection. |
| 16 | VZCR | output | Voltage reference output pin giving a zero-current (0 A) reference whose output voltage scales with VCC. |
| 17 | FILTER | passive | Filter pin; connect an external capacitor from this pin to GND to set the device bandwidth. |
| 18 | VIOUT | output | Analog output pin whose output voltage is proportional to the current flowing through the loop between the IP+ and IP- pins. |
| 19 | FAULT | output | Overcurrent Fault pin that transitions to a logic low state when the current between the IP+ and IP- pins exceeds the overcurrent fault threshold. |
| 20 | VCC | power_in | Supply voltage pin. |
| 21 | VOC | input | Overcurrent Input pin; the analog input voltage on this pin sets the overcurrent fault threshold. |
| 22 | FAULT_EN | input | Fault enable pin that enables overcurrent faulting when high and resets the FAULT output when low. |
| 23 | NC | unconnected | No connection. |
| 24 | NC | unconnected | No connection. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Allegro MicroSystems, LLC |
| Package | QSOP-24 |
| Category | Sensors |
| Pins | 24 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3 | | 5.5 | V | | 4 |
| Output Capacitance Load | CLOAD | | | 10 | nF | VIOUT pin to GND | 4 |
| Output Resistive Load | RLOAD | 10 | | | kΩ | VIOUT pin to GND | 4 |
| Supply Current | ICC | | 11 | 14.5 | mA | VIOUT open, FAULT pin high, VCC = 5 V (all versions but -6BB) | 4 |
| Full Range Linearity | ELIN | -0.75 | | 0.75 | % | IP = ±IP0A | 4 |
| Symmetry | ESYM | 99.1 | 100 | 100.9 | % | IP = ±IP0A | 4 |
| Setting Voltage for Overcurrent Switch Point | VOC | 0.25 | | 0.4 | V | | 4 |
| Signal Noise at Overcurrent Comparator Input | INCOMP | -1 | | 1 | A | | 4 |
| Overcurrent Fault Switch Point Error | EOC | -5 | | 5 | % | Switch point in VOC safe operating area; assumes INCOMP = 0 A | 4 |
| Overcurrent FAULT Pin Output Voltage | VFAULT | | | 0.4 | V | 1 mA sink current at FAULT pin | 4 |
| Fault Enable (FAULT_EN Pin) Input Low Voltage Threshold | VIL | | | 0.1 | V | | 4 |
| Fault Enable (FAULT_EN Pin) Input High Voltage Threshold | VIH | 0.8 | | | V | | 4 |
| Overcurrent Input Pin Resistance | ROC | 2 | | | MΩ | TA = 25°C, VOC pin to GND | 5 |
| Voltage Reference Output Load Current (source) | IZCR | 3 | | | mA | Source current | 5 |
| Voltage Reference Output Load Current (sink) | IZCR | 50 | | | µA | Sink current | 5 |
| Voltage Reference Output Drift | ΔVZCR | -10 | | 10 | mV | | 5 |
| Optimized Accuracy Range | IP(OA) | -37.5 | | 37.5 | A | X35BB (VCC = 5 V) | 7 |
| Linear Sensing Range | IP(LIN) | -75 | | 75 | A | X35BB (VCC = 5 V) | 7 |
| Sensitivity | Sens | 27 | | 29.5 | mV/A | IP = 25 A, TA = 25°C to 150°C | 7 |
| Electrical Offset Voltage | VOE | -5 | | 5 | mV | IP = 0 A, TA = 25°C | 7 |
| Electrical Offset Voltage | VOE | -25 | | 25 | mV | IP = 0 A, TA = 25°C to 150°C | 7 |
| Electrical Offset Voltage | VOE | -40 | | 40 | mV | IP = 0 A, TA =, 40°C to 25°C | 7 |
| Total Output Error | ETOT | -3 | | 3 | % | Tested at IP = 25 A, IP applied for 5 ms, TA = 25°C to 150°C | 7 |
| Supply Voltage (absolute maximum) | VCC | | | 8 | V | | 2 |
| Filter Pin Voltage | VFILTER | | | 8 | V | | 2 |
| Analog Output Pin Voltage | VIOUT | | | 32 | V | | 2 |
| Overcurrent Input Pin Voltage | VOC | | | 8 | V | | 2 |
| Overcurrent Fault Pin Voltage | VFAULT | | | 8 | V | | 2 |
| Fault Enable Pin Voltage | VFAULTEN | | | 8 | V | | 2 |
| Voltage Reference Output Pin Voltage | VZCR | | | 8 | V | | 2 |
| DC Reverse Voltage (supply, filter, analog output, overcurrent input, overcurrent fault, fault enable, voltage reference output pins) | VRdcx | -0.5 | | | V | | 2 |
| Output Current Source | IIOUT(Source) | | | 3 | mA | | 2 |
| Output Current Sink | IIOUT(Sink) | | | 1 | mA | | 2 |
| Operating Ambient Temperature Range L | TA | -40 | | 150 | °C | Range L | 2 |
| Junction Temperature | TJ(max) | | | 165 | °C | | 2 |
| Storage Temperature | Tstg | -65 | | 170 | °C | | 2 |
| Steady State Package Thermal Resistance | RθJA | | 21 | | °C/W | Tested with 30 A DC current, ACS709 demo board in 1 cu. ft. of still air | 8 |
## Materials and finish
As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | | 1 through 6 IP+ Sensed current copper conduction path pins. Terminals for current being sensed; | 3 |
## CAD (KiCad official)
- Symbol: `ACS709LLFTR-35BB-T`
- Footprint: `Package_SO:QSOP-24_3.9x8.7mm_P0.635mm`
- 3D model: QSOP-24 (KiCad packages3D, STEP)
- 3D model files: `acs709llftr-35bb-t-etched.step` / `acs709llftr-35bb-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `acs709llftr-35bb-t.step` / `acs709llftr-35bb-t.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Allegro MicroSystems, LLC datasheet](docs/acs709llftr-35bb-t-datasheet.pdf) (21 pp, sha256 `28234f2ddfd5160e`, retrieved 2026-10-31, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/acs709llftr-35bb-t-datasheet.pdf)