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AP3844CMTR-E1
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Diodes Incorporated AC-DC Controllers & Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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AP3844CMTR-E1
Diodes Incorporated · AC-DC Controllers & Regulators · SOIC-8
AP3844CMTR-E1 from Diodes Incorporated, in a SOIC-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 | COMP | output | Error amplifier output, made available for loop compensation, with a rated error amplifier output sink current of 10 mA maximum. |
| 2 | VFB | input | Inverting input of the error amplifier, normally connected to the switching power supply output through a resistor divider, with an input voltage of 2.45 V to 2.55 V at pin 1 = 2.5 V. |
| 3 | ISENSE | input | Input carrying a voltage proportional to inductor current that the PWM uses to terminate output switch conduction, with a maximum input signal of 0.9 V to 1.1 V (1 V typical). |
| 4 | RT/CT | passive | Oscillator timing pin where resistor RT connects to VREF and capacitor CT connects to ground to program the oscillator frequency and maximum duty cycle, with operation to 500 kHz possible. |
| 5 | GND | power_in | Combined control circuitry and power ground, which is the reference for all voltages on the device. |
| 6 | OUTPUT | output | Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A. |
| 7 | VCC | power_in | Positive supply of the control IC, with an absolute maximum supply voltage of 30 V. |
| 8 | VREF | power_out | Reference output that provides 5.00 V typical (4.90 V to 5.10 V at TA = 25 °C, IREF = 1 mA) and supplies charging current for CT through RT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOIC-8 |
| Category | Power Management |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 30 | V | 5 | |||
| Output Current | IO | -1 | 1 | A | 5 | ||
| Analog Inputs | V(ANA) | -0.3 | 6.3 | V | 5 | ||
| Error Amp Output Sink Current | ISINK(E.A) | 10 | mA | 5 | |||
| Power Dissipation (SOIC-8) | PD | 460 | mW | TA<25 oC, Note 3 | 5 | ||
| Junction Operating Temperature | TJ | -40 | 150 | oC | 5 | ||
| Storage Temperature Range | TSTG | -65 | 150 | oC | 5 | ||
| Lead Temperature (Soldering, 10 sec) | TLEAD | 300 | oC | Soldering, 10 sec | 5 | ||
| ESD (Machine Model) | 250 | V | Machine Model | 5 | |||
| Oscillation Frequency | f | 500 | KHz | 5 | |||
| Ambient Temperature | TA | -40 | 85 | oC | 5 | ||
| Thermal Resistance (Junction to Ambient, SOIC-8) | θJA | 160 | oC/W | SOIC-8 | 5 | ||
| Reference Output Voltage | VREF | 4.9 | 5 | 5.1 | V | TA=25oC, IREF=1mA | 6 |
| Total Output Variation | 4.82 | 5.18 | V | Line, Load, Temp. | 6 | ||
| Line Regulation | ΔVREF | 4 | 15 | mV | 12V ≤ VCC ≤25V | 6 | |
| Load Regulation | ΔVREF | 4 | 15 | mV | 1mA ≤ IREF ≤20mA | 6 | |
| Short Circuit Output Current | ISC | -100 | -180 | mA | TA=25oC | 6 | |
| Reference Temperature Stability | 0.3 | mV/oC | Note 6 | 6 | |||
| Oscillation Frequency | f | 47 | 52 | 57 | KHz | TA=25oC | 6 |
| Oscillator Amplitude | VOSC | 1.7 | V | Pin 4, peak to peak, Note 6 | 6 | ||
| Oscillator Temperature Stability | 2.5 | % | Note 6 | 6 | |||
| Oscillator Voltage Stability | 0.2 | 1 | % | 12V ≤ VCC ≤ 25V | 6 | ||
| Discharge Current | 8.5 | 9.5 | 10.5 | mA | Vpin 4 = 2V, Note 7 | 6 | |
| Error Amplifier Input Voltage | VI | 2.45 | 2.5 | 2.55 | V | Vpin 1 = 2.5V | 6 |
| Error Amplifier Output Sink Current | ISINK | 5 | 8 | mA | Vpin1 = 1.1V | 6 | |
| Error Amplifier Output Source Current | ISOURCE | -0.5 | -0.8 | mA | Vpin1 = 5V | 6 | |
| Error Amplifier High Output Voltage | VOH | 5 | 7 | V | RL = 15kΩ to GND | 6 | |
| Error Amplifier Low Output Voltage | VOL | 0.7 | 1.1 | V | RL = 15kΩ to pin 8 | 6 | |
| Error Amplifier Voltage Gain | 65 | 90 | dB | 2V ≤ VO ≤ 4V | 6 | ||
| Error Amplifier Power Supply Rejection Ratio | PSRR | 60 | 70 | dB | 12V ≤ VCC ≤ 25V | 6 | |
| Maximum Input Signal | VI(MAX) | 0.9 | 1 | 1.1 | V | Vpin1 = 5V, Note 4 | 6 |
| Current Sense Gain | GV | 2.85 | 3 | 3.15 | V/V | Note 4, 5 | 6 |
| Current Sense Power Supply Rejection Ratio | PSRR | 70 | dB | 12V ≤ VCC ≤ 25V, Note 4, 6 | 6 | ||
| Delay to Output | 150 | 300 | ns | Vpin3 = 0 to 2V, Note 6 | 6 | ||
| Input Bias Current | IBIAS | -3 | -10 | μA | 6 | ||
| Low Output Voltage (20 mA sink) | VOL | 0.1 | 0.4 | V | ISINK = 20mA | 6 | |
| Low Output Voltage (200 mA sink) | VOL | 1.4 | 2.2 | V | ISINK = 200mA | 6 | |
| High Output Voltage (20 mA source) | VOH | 13 | 14 | V | ISOURCE = 20mA | 6 | |
| High Output Voltage (200 mA source) | VOH | 12 | 13 | V | ISOURCE = 200mA | 6 | |
| Rise Time | tR | 50 | 150 | ns | TA=25oC, CL=1nF, Note 6 | 6 | |
| Fall Time | tF | 50 | 150 | ns | TA=25oC, CL=1nF, Note 6 | 6 | |
| Start Threshold (AP3844C) | VTH(ST) | 15 | 16 | 17 | V | AP3842C/AP3844C | 7 |
| Min. Operation Voltage After Turn On (AP3844C) | VOPR(Min.) | 8.5 | 10 | 11.5 | V | AP3842C/AP3844C | 7 |
| Max. Duty Cycle (AP3844C) | D(Max.) | 46 | 48 | 50 | % | AP3844C/AP3845C | 7 |
| Min. Duty Cycle | D(Min.) | 0 | % | 7 | |||
| Start-up Current (AP3844C) | IST | 50 | 80 | μA | AP3842C/AP3844C, VCC = 14V | 7 | |
| Operating Supply Current | ICC(OPR) | 8 | 12 | mA | Vpin3 = Vpin2 = 0V | 7 | |
| Zener Voltage | VZ | 30 | 34 | V | ICC = 25mA | 7 | |
| Shutdown Temperature | TSHUT | 155 | oC | Note 6 | 7 | ||
| Temperature Hysteresis | THYS | 25 | oC | Note 6 | 7 |
CAD (KiCad official)
- Symbol:
AP3844CMTR-E1 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
ap3844cmtr-e1-etched.step/ap3844cmtr-e1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ap3844cmtr-e1.step/ap3844cmtr-e1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (14 pp, sha256
489e939c4048332f, retrieved 2026-11-05, 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).
# AP3844CMTR-E1
**Diodes Incorporated** · AC-DC Controllers & Regulators · SOIC-8
AP3844CMTR-E1 from Diodes Incorporated, in a SOIC-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 | COMP | output | Error amplifier output, made available for loop compensation, with a rated error amplifier output sink current of 10 mA maximum. |
| 2 | VFB | input | Inverting input of the error amplifier, normally connected to the switching power supply output through a resistor divider, with an input voltage of 2.45 V to 2.55 V at pin 1 = 2.5 V. |
| 3 | ISENSE | input | Input carrying a voltage proportional to inductor current that the PWM uses to terminate output switch conduction, with a maximum input signal of 0.9 V to 1.1 V (1 V typical). |
| 4 | RT/CT | passive | Oscillator timing pin where resistor RT connects to VREF and capacitor CT connects to ground to program the oscillator frequency and maximum duty cycle, with operation to 500 kHz possible. |
| 5 | GND | power_in | Combined control circuitry and power ground, which is the reference for all voltages on the device. |
| 6 | OUTPUT | output | Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A. |
| 7 | VCC | power_in | Positive supply of the control IC, with an absolute maximum supply voltage of 30 V. |
| 8 | VREF | power_out | Reference output that provides 5.00 V typical (4.90 V to 5.10 V at TA = 25 °C, IREF = 1 mA) and supplies charging current for CT through RT. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOIC-8 |
| Category | Power Management |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | | | 30 | V | | 5 |
| Output Current | IO | -1 | | 1 | A | | 5 |
| Analog Inputs | V(ANA) | -0.3 | | 6.3 | V | | 5 |
| Error Amp Output Sink Current | ISINK(E.A) | | | 10 | mA | | 5 |
| Power Dissipation (SOIC-8) | PD | | | 460 | mW | TA<25 oC, Note 3 | 5 |
| Junction Operating Temperature | TJ | -40 | | 150 | oC | | 5 |
| Storage Temperature Range | TSTG | -65 | | 150 | oC | | 5 |
| Lead Temperature (Soldering, 10 sec) | TLEAD | | | 300 | oC | Soldering, 10 sec | 5 |
| ESD (Machine Model) | | | | 250 | V | Machine Model | 5 |
| Oscillation Frequency | f | | | 500 | KHz | | 5 |
| Ambient Temperature | TA | -40 | | 85 | oC | | 5 |
| Thermal Resistance (Junction to Ambient, SOIC-8) | θJA | | 160 | | oC/W | SOIC-8 | 5 |
| Reference Output Voltage | VREF | 4.9 | 5 | 5.1 | V | TA=25oC, IREF=1mA | 6 |
| Total Output Variation | | 4.82 | | 5.18 | V | Line, Load, Temp. | 6 |
| Line Regulation | ΔVREF | 4 | | 15 | mV | 12V ≤ VCC ≤25V | 6 |
| Load Regulation | ΔVREF | 4 | | 15 | mV | 1mA ≤ IREF ≤20mA | 6 |
| Short Circuit Output Current | ISC | -100 | | -180 | mA | TA=25oC | 6 |
| Reference Temperature Stability | | | 0.3 | | mV/oC | Note 6 | 6 |
| Oscillation Frequency | f | 47 | 52 | 57 | KHz | TA=25oC | 6 |
| Oscillator Amplitude | VOSC | | 1.7 | | V | Pin 4, peak to peak, Note 6 | 6 |
| Oscillator Temperature Stability | | | 2.5 | | % | Note 6 | 6 |
| Oscillator Voltage Stability | | 0.2 | | 1 | % | 12V ≤ VCC ≤ 25V | 6 |
| Discharge Current | | 8.5 | 9.5 | 10.5 | mA | Vpin 4 = 2V, Note 7 | 6 |
| Error Amplifier Input Voltage | VI | 2.45 | 2.5 | 2.55 | V | Vpin 1 = 2.5V | 6 |
| Error Amplifier Output Sink Current | ISINK | 5 | | 8 | mA | Vpin1 = 1.1V | 6 |
| Error Amplifier Output Source Current | ISOURCE | -0.5 | | -0.8 | mA | Vpin1 = 5V | 6 |
| Error Amplifier High Output Voltage | VOH | 5 | | 7 | V | RL = 15kΩ to GND | 6 |
| Error Amplifier Low Output Voltage | VOL | 0.7 | | 1.1 | V | RL = 15kΩ to pin 8 | 6 |
| Error Amplifier Voltage Gain | | 65 | | 90 | dB | 2V ≤ VO ≤ 4V | 6 |
| Error Amplifier Power Supply Rejection Ratio | PSRR | 60 | | 70 | dB | 12V ≤ VCC ≤ 25V | 6 |
| Maximum Input Signal | VI(MAX) | 0.9 | 1 | 1.1 | V | Vpin1 = 5V, Note 4 | 6 |
| Current Sense Gain | GV | 2.85 | 3 | 3.15 | V/V | Note 4, 5 | 6 |
| Current Sense Power Supply Rejection Ratio | PSRR | | 70 | | dB | 12V ≤ VCC ≤ 25V, Note 4, 6 | 6 |
| Delay to Output | | 150 | | 300 | ns | Vpin3 = 0 to 2V, Note 6 | 6 |
| Input Bias Current | IBIAS | -3 | | -10 | μA | | 6 |
| Low Output Voltage (20 mA sink) | VOL | 0.1 | | 0.4 | V | ISINK = 20mA | 6 |
| Low Output Voltage (200 mA sink) | VOL | 1.4 | | 2.2 | V | ISINK = 200mA | 6 |
| High Output Voltage (20 mA source) | VOH | 13 | 14 | | V | ISOURCE = 20mA | 6 |
| High Output Voltage (200 mA source) | VOH | 12 | 13 | | V | ISOURCE = 200mA | 6 |
| Rise Time | tR | 50 | | 150 | ns | TA=25oC, CL=1nF, Note 6 | 6 |
| Fall Time | tF | 50 | | 150 | ns | TA=25oC, CL=1nF, Note 6 | 6 |
| Start Threshold (AP3844C) | VTH(ST) | 15 | 16 | 17 | V | AP3842C/AP3844C | 7 |
| Min. Operation Voltage After Turn On (AP3844C) | VOPR(Min.) | 8.5 | 10 | 11.5 | V | AP3842C/AP3844C | 7 |
| Max. Duty Cycle (AP3844C) | D(Max.) | 46 | 48 | 50 | % | AP3844C/AP3845C | 7 |
| Min. Duty Cycle | D(Min.) | 0 | | | % | | 7 |
| Start-up Current (AP3844C) | IST | 50 | 80 | | μA | AP3842C/AP3844C, VCC = 14V | 7 |
| Operating Supply Current | ICC(OPR) | 8 | 12 | | mA | Vpin3 = Vpin2 = 0V | 7 |
| Zener Voltage | VZ | 30 | 34 | | V | ICC = 25mA | 7 |
| Shutdown Temperature | TSHUT | | 155 | | oC | Note 6 | 7 |
| Temperature Hysteresis | THYS | | 25 | | oC | Note 6 | 7 |
## CAD (KiCad official)
- Symbol: `AP3844CMTR-E1`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ap3844cmtr-e1-etched.step` / `ap3844cmtr-e1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ap3844cmtr-e1.step` / `ap3844cmtr-e1.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Diodes Incorporated datasheet](docs/ap3844cmtr-e1-datasheet.pdf) (14 pp, sha256 `489e939c4048332f`, retrieved 2026-11-05, 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/ap3844cmtr-e1-datasheet.pdf)