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LT1521CMS8#PBF
Public Made by Adomby adom
Analog Devices Linear Voltage Regulators (LDO), MSOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LT1521CMS8#PBF
Analog Devices · Linear Voltage Regulators (LDO) · MSOP-8
LT1521CMS8#PBF from Analog Devices, in a MSOP-8. 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 | OUT | power_out | Regulator output supplying up to 300mA to the load, requiring a minimum output capacitor of 1.5µF to prevent oscillations. |
| 2 | ADJ | input | Error amplifier input on the adjustable LT1521 with a 3.75V reference, 50nA bias current flowing into the pin, internal clamps at 6V and -0.6V, and an output range of 3.75V to 20V. |
| 3 | NC | unconnected | No internal connection on the MS8 package. |
| 4 | GND | power_in | Ground pin of the MS8 package (the only ground lead on this package). |
| 5 | SHDN | input | Active-low shutdown input that turns the output off when pulled low, is internally clamped to 7V and -0.6V, can be left open to keep the device on, and has pull-up current limited to 5mA. |
| 6 | NC | unconnected | No internal connection on the MS8 package. |
| 7 | NC | unconnected | No internal connection on the MS8 package. |
| 8 | IN | power_in | Power input withstanding reverse voltages up to 20V (absolute maximum ±20V), to be bypassed with 1µF to 10µF if far from the main input filter capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-8 |
| Category | Power Management ICs |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Regulated Output Voltage (ADJ pin tied to output) | VOUT | 3.695 | 3.75 | 3.805 | V | VIN = 4.3V, IOUT = 1mA, TJ = 25°C | 3 |
| Regulated Output Voltage (ADJ pin tied to output) | VOUT | 3.64 | 3.75 | 3.86 | V | 4.8V < VIN < 20V, 1mA < IOUT < 300mA, over temperature | 3 |
| Line Regulation | 1.5 | 20 | mV | ΔVIN = 4.3 to 20V, IOUT = 1mA | 3 | ||
| Load Regulation | -20 | -30 | mV | ΔILOAD = 1mA to 300mA, TJ ≤ 25°C | 3 | ||
| Load Regulation | -20 | -55 | mV | ΔILOAD = 1mA to 300mA, TJ > 25°C | 3 | ||
| Dropout Voltage | 130 | 170 | mV | ILOAD = 1mA, TJ = 25°C | 3 | ||
| Dropout Voltage | 250 | mV | ILOAD = 1mA, over temperature | 3 | |||
| Dropout Voltage | 290 | 350 | mV | ILOAD = 50mA, TJ = 25°C | 3 | ||
| Dropout Voltage | 450 | mV | ILOAD = 50mA, over temperature | 3 | |||
| Dropout Voltage | 350 | 420 | mV | ILOAD = 100mA, TJ = 25°C | 3 | ||
| Dropout Voltage | 550 | mV | ILOAD = 100mA, over temperature | 3 | |||
| Dropout Voltage | 400 | 470 | mV | ILOAD = 150mA, TJ = 25°C | 3 | ||
| Dropout Voltage | 600 | mV | ILOAD = 150mA, over temperature | 3 | |||
| Dropout Voltage | 500 | 600 | mV | ILOAD = 300mA, TJ = 25°C | 3 | ||
| Dropout Voltage | 750 | mV | ILOAD = 300mA, over temperature | 3 | |||
| Ground Pin Current | 12 | 25 | µA | ILOAD = 0mA | 3 | ||
| Ground Pin Current | 65 | 100 | µA | ILOAD = 1mA | 3 | ||
| Ground Pin Current | 300 | 450 | µA | ILOAD = 10mA | 3 | ||
| Ground Pin Current | 0.8 | 1.5 | mA | ILOAD = 50mA | 3 | ||
| Ground Pin Current | 1.4 | 2.5 | mA | ILOAD = 100mA | 3 | ||
| Ground Pin Current | 2.2 | 4 | mA | ILOAD = 150mA | 3 | ||
| Ground Pin Current | 6.5 | 12 | mA | ILOAD = 300mA | 3 | ||
| Adjust Pin Bias Current | 50 | 100 | nA | TJ = 25°C | 3 | ||
| Shutdown Threshold (Off to On) | 1.2 | 2.8 | V | VOUT = Off to On | 3 | ||
| Shutdown Threshold (On to Off) | 0.25 | 0.75 | V | VOUT = On to Off | 3 | ||
| Shutdown Pin Current | 2 | 5 | µA | VSHDN = 0V | 3 | ||
| Quiescent Current in Shutdown | 6 | 12 | µA | VIN = VOUT (NOMINAL) + 1V, VSHDN = 0V | 3 | ||
| Ripple Rejection | 50 | 58 | dB | VIN, VOUT = 1V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 150mA | 3 | ||
| Current Limit | 400 | 800 | mA | VIN, VOUT = 7V, TJ = 25°C | 3 | ||
| Current Limit | 320 | 400 | mA | VIN = VOUT (NOMINAL) + 1.5V, ∆VOUT =, 0.1V | 3 | ||
| Input Reverse Leakage Current | 1 | mA | VIN =, 20V, VOUT = 0V | 4 | |||
| Reverse Output Current | 5 | 10 | µA | VOUT = 3.8V, VIN < 3.75V, TJ = 25°C | 4 | ||
| Input Voltage | -20 | 20 | V | 2 | |||
| Output Pin Reverse Current | 10 | mA | 2 | ||||
| Adjust Pin Current | 10 | mA | 2 | ||||
| Shutdown Pin Input Voltage | -0.6 | 6.5 | V | 2 | |||
| Shutdown Pin Input Current | 5 | mA | 2 | ||||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Operating Junction Temperature Range, Commercial | 0 | 125 | °C | Commercial | 2 | ||
| Lead Temperature (Soldering, 10 sec) | 300 | °C | 2 | ||||
| Maximum Junction Temperature | TJMAX | 125 | °C | MS8 package | 2 | ||
| Thermal Resistance Junction-to-Ambient | θJA | 125 | °C/W | MS8 package | 2 | ||
| Thermal Resistance Junction-to-Ambient | 110 | °C/W | MS8, 2500mm2 topside copper, 2500mm2 backside, 2500mm2 board area | 10 | |||
| Thermal Resistance Junction-to-Ambient | 130 | °C/W | MS8, 100mm2 topside copper, 2500mm2 backside, 2500mm2 board area | 10 |
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 | 3/32" FR-4 board with one ounce copper. All NC leads were | 10 |
CAD (KiCad official)
- Symbol:
LT1521CMS8#PBF - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files:
lt1521cms8-pbf-etched.step/lt1521cms8-pbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt1521cms8-pbf.step/lt1521cms8-pbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (16 pp, sha256
a580c39ec72785d9, retrieved 2026-10-31, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# LT1521CMS8#PBF
**Analog Devices** · Linear Voltage Regulators (LDO) · MSOP-8
LT1521CMS8#PBF from Analog Devices, in a MSOP-8. 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 | OUT | power_out | Regulator output supplying up to 300mA to the load, requiring a minimum output capacitor of 1.5µF to prevent oscillations. |
| 2 | ADJ | input | Error amplifier input on the adjustable LT1521 with a 3.75V reference, 50nA bias current flowing into the pin, internal clamps at 6V and -0.6V, and an output range of 3.75V to 20V. |
| 3 | NC | unconnected | No internal connection on the MS8 package. |
| 4 | GND | power_in | Ground pin of the MS8 package (the only ground lead on this package). |
| 5 | SHDN | input | Active-low shutdown input that turns the output off when pulled low, is internally clamped to 7V and -0.6V, can be left open to keep the device on, and has pull-up current limited to 5mA. |
| 6 | NC | unconnected | No internal connection on the MS8 package. |
| 7 | NC | unconnected | No internal connection on the MS8 package. |
| 8 | IN | power_in | Power input withstanding reverse voltages up to 20V (absolute maximum ±20V), to be bypassed with 1µF to 10µF if far from the main input filter capacitor. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-8 |
| Category | Power Management ICs |
| Pins | 8 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Regulated Output Voltage (ADJ pin tied to output) | VOUT | 3.695 | 3.75 | 3.805 | V | VIN = 4.3V, IOUT = 1mA, TJ = 25°C | 3 |
| Regulated Output Voltage (ADJ pin tied to output) | VOUT | 3.64 | 3.75 | 3.86 | V | 4.8V < VIN < 20V, 1mA < IOUT < 300mA, over temperature | 3 |
| Line Regulation | | | 1.5 | 20 | mV | ΔVIN = 4.3 to 20V, IOUT = 1mA | 3 |
| Load Regulation | | | -20 | -30 | mV | ΔILOAD = 1mA to 300mA, TJ ≤ 25°C | 3 |
| Load Regulation | | | -20 | -55 | mV | ΔILOAD = 1mA to 300mA, TJ > 25°C | 3 |
| Dropout Voltage | | | 130 | 170 | mV | ILOAD = 1mA, TJ = 25°C | 3 |
| Dropout Voltage | | | | 250 | mV | ILOAD = 1mA, over temperature | 3 |
| Dropout Voltage | | | 290 | 350 | mV | ILOAD = 50mA, TJ = 25°C | 3 |
| Dropout Voltage | | | | 450 | mV | ILOAD = 50mA, over temperature | 3 |
| Dropout Voltage | | | 350 | 420 | mV | ILOAD = 100mA, TJ = 25°C | 3 |
| Dropout Voltage | | | | 550 | mV | ILOAD = 100mA, over temperature | 3 |
| Dropout Voltage | | | 400 | 470 | mV | ILOAD = 150mA, TJ = 25°C | 3 |
| Dropout Voltage | | | | 600 | mV | ILOAD = 150mA, over temperature | 3 |
| Dropout Voltage | | | 500 | 600 | mV | ILOAD = 300mA, TJ = 25°C | 3 |
| Dropout Voltage | | | | 750 | mV | ILOAD = 300mA, over temperature | 3 |
| Ground Pin Current | | | 12 | 25 | µA | ILOAD = 0mA | 3 |
| Ground Pin Current | | | 65 | 100 | µA | ILOAD = 1mA | 3 |
| Ground Pin Current | | | 300 | 450 | µA | ILOAD = 10mA | 3 |
| Ground Pin Current | | | 0.8 | 1.5 | mA | ILOAD = 50mA | 3 |
| Ground Pin Current | | | 1.4 | 2.5 | mA | ILOAD = 100mA | 3 |
| Ground Pin Current | | | 2.2 | 4 | mA | ILOAD = 150mA | 3 |
| Ground Pin Current | | | 6.5 | 12 | mA | ILOAD = 300mA | 3 |
| Adjust Pin Bias Current | | | 50 | 100 | nA | TJ = 25°C | 3 |
| Shutdown Threshold (Off to On) | | | 1.2 | 2.8 | V | VOUT = Off to On | 3 |
| Shutdown Threshold (On to Off) | | | 0.25 | 0.75 | V | VOUT = On to Off | 3 |
| Shutdown Pin Current | | | 2 | 5 | µA | VSHDN = 0V | 3 |
| Quiescent Current in Shutdown | | | 6 | 12 | µA | VIN = VOUT (NOMINAL) + 1V, VSHDN = 0V | 3 |
| Ripple Rejection | | 50 | 58 | | dB | VIN, VOUT = 1V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 150mA | 3 |
| Current Limit | | | 400 | 800 | mA | VIN, VOUT = 7V, TJ = 25°C | 3 |
| Current Limit | | 320 | 400 | | mA | VIN = VOUT (NOMINAL) + 1.5V, ∆VOUT =, 0.1V | 3 |
| Input Reverse Leakage Current | | | | 1 | mA | VIN =, 20V, VOUT = 0V | 4 |
| Reverse Output Current | | | 5 | 10 | µA | VOUT = 3.8V, VIN < 3.75V, TJ = 25°C | 4 |
| Input Voltage | | -20 | | 20 | V | | 2 |
| Output Pin Reverse Current | | | | 10 | mA | | 2 |
| Adjust Pin Current | | | | 10 | mA | | 2 |
| Shutdown Pin Input Voltage | | -0.6 | | 6.5 | V | | 2 |
| Shutdown Pin Input Current | | | | 5 | mA | | 2 |
| Storage Temperature Range | | -65 | | 150 | °C | | 2 |
| Operating Junction Temperature Range, Commercial | | 0 | | 125 | °C | Commercial | 2 |
| Lead Temperature (Soldering, 10 sec) | | | | 300 | °C | | 2 |
| Maximum Junction Temperature | TJMAX | | | 125 | °C | MS8 package | 2 |
| Thermal Resistance Junction-to-Ambient | θJA | | 125 | | °C/W | MS8 package | 2 |
| Thermal Resistance Junction-to-Ambient | | | 110 | | °C/W | MS8, 2500mm2 topside copper, 2500mm2 backside, 2500mm2 board area | 10 |
| Thermal Resistance Junction-to-Ambient | | | 130 | | °C/W | MS8, 100mm2 topside copper, 2500mm2 backside, 2500mm2 board area | 10 |
## 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 | | 3/32" FR-4 board with one ounce copper. All NC leads were | 10 |
## CAD (KiCad official)
- Symbol: `LT1521CMS8#PBF`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lt1521cms8-pbf-etched.step` / `lt1521cms8-pbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lt1521cms8-pbf.step` / `lt1521cms8-pbf.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/1521335fb.pdf) (16 pp, sha256 `a580c39ec72785d9`, retrieved 2026-10-31, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/lt1521cms8-pbf-datasheet.pdf)