component
MT7938
Public Made by Adomby adom
MAXIC Tech LED Drivers, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownMT7938
MAXIC Tech · LED Drivers · SOT-23-6
MT7938 from MAXIC Tech, in a SOT-23-6. 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 | TADJ | input | Over-temperature regulation setting pin; the temperature regulation threshold is set by the ratio of the external resistor R7 to the DSEN resistance (R7/(RDSEN+9kΩ)), giving 88°C to 148°C (148°C when floating). |
| 2 | GND | power_in | Chip ground. |
| 3 | CS | input | Current sense pin; cycle-by-cycle over-current protection trips when CS exceeds 1.8V, with 240ns internal leading-edge blanking and an absolute maximum of 5V. |
| 4 | DRV | output | Gate drive output for the external power MOSFET, with 0.2A sink and 0.2A source capability at DRV=4V and an absolute maximum of 24V. |
| 5 | VDD | power_in | Chip power supply, operating range 6.8V to 20V (start-up at 20V, UVLO 6.8V falling, clamp 20V, OVP threshold 27V). |
| 6 | DSEN | input | Auxiliary winding feedback voltage sensed via a resistor divider to reflect output voltage; output OVP trips above 3.6V and the absolute maximum is 5V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MAXIC Tech |
| Package | SOT-23-6 |
| Category | Nixie Tube Driver/LED Driver |
| Pins | 6 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Primary current sense reference voltage | VFB | 392 | 400 | 408 | mV | VDD=15V, TA=25°C | 4 |
| VDD pin voltage | VDD | -0.3 | V | to VDD clamp voltage | 2 | ||
| DRV pin voltage | DRV | -0.3 | 24 | V | 2 | ||
| TADJ/CS/DSEN pin voltage | -0.3 | 5 | V | 2 | |||
| Power dissipation | PDMAX | 0.5 | W | 2 | |||
| Soldering temperature | 260 | °C | soldering, 10 s | 2 | |||
| Storage temperature | TSTG | -55 | 150 | °C | 2 | ||
| Operating junction temperature | TJ | -40 | 150 | °C | 2 | ||
| Supply voltage | 6.8 | 20 | V | 2 | |||
| Operating ambient temperature | -40 | 125 | °C | 2 | |||
| Thermal resistance junction to ambient | RθJA | 145 | °C/W | TA=25°C, JEDEC 51-3, 2"x2" FR-4 | 2 | ||
| Thermal resistance junction to case | RθJC | 80 | °C/W | TA=25°C, JEDEC 51-3, 2"x2" FR-4 | 2 | ||
| Startup current | ISTART | 50 | μA | 4 | |||
| Undervoltage lockout threshold | VUVLO | 6.8 | V | VDD pin voltage falling | 4 | ||
| Startup voltage | VSTART | 20 | V | VDD pin voltage rising | 4 | ||
| Quiescent current | IQ | 0.5 | mA | 4 | |||
| VDD clamp current | IVDD_CLAMP | 10 | mA | VDD>20V | 4 | ||
| VDD clamp voltage | VDDCLM | 20 | V | 4 | |||
| VDD pin OVP threshold | VOVP1 | 27 | V | 4 | |||
| DSEN pin OVP threshold | VOVP2 | 3.6 | V | 4 | |||
| Off-state leading edge blanking time | TOFF_LEB | 2.1 | μs | 4 | |||
| Maximum on time | TON_MAX | 25 | μs | 4 | |||
| Maximum off time | TOFF_MAX | 250 | μs | 4 | |||
| Minimum switching period | TMIN | 10 | μs | 4 | |||
| CS pin leading edge blanking time | TCS_LEB | 240 | ns | 4 | |||
| CS pin overcurrent protection threshold | VCS_OCP | 1.8 | V | 4 | |||
| Maximum over-temperature regulation threshold | TOTR_MAX | 148 | °C | TADJ pin floating | 4 | ||
| Minimum over-temperature regulation threshold | TOTR_MIN | 88 | °C | TADJ pin resistor adjusted | 4 | ||
| Maximum driver sink current | ISINK | 0.2 | A | DRV=4V | 4 | ||
| Maximum driver source current | ISOURCE | 0.2 | A | DRV=4V | 4 |
CAD (KiCad official)
- Symbol:
MT7938 - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
mt7938-etched.step/mt7938-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mt7938.step/mt7938.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MAXIC Tech datasheet (7 pp, sha256
b459f1b30c271350, retrieved 2026-10-27, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).