component

SD4938TR

Public Made by Adom

by adom

SILAN(士兰微) , SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SD4938TR

SILAN(士兰微) · IC · SOP-8

SD4938TR from SILAN(士兰微), in a SOP-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 VDD power_in Supplies the control circuitry; the datasheet gives a startup threshold of 12.1-13.9V (13V typ), an undervoltage point of 7.9-9.5V (8.7V typ), an overvoltage point of 21.5-24.5V (23V typ), a clamp of 28-35V (31V typ), and an operating range of 10-21V after startup.
2 NC unconnected No connection; the datasheet lists this pin as not connected.
3 NC unconnected No connection; the datasheet lists this pin as not connected.
4 NC unconnected No connection; the datasheet lists this pin as not connected.
5 DRAIN output Drain of the internal power MOSFET; the DRAIN-to-SOURCE high-voltage rating is 155V maximum, and the device is specified for a 20V to 150V input.
6 DRAIN output Drain of the internal power MOSFET; the DRAIN-to-SOURCE high-voltage rating is 155V maximum, and the device is specified for a 20V to 150V input.
7 VSET input Sets the output voltage: left floating gives 12V, tied to GND gives 15V, and a 51kΩ resistor to GND gives 18V.
8 GND power_in Source of the power MOSFET and reference ground for the control circuit.

Key specifications

Parameter Value
Manufacturer SILAN(士兰微)
Package SOP-8
Category
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
VDD operating voltage range (after startup) VDD 10 21 V 启动后 3
VDD start-up voltage VDDON 12.1 13 13.9 V 3
VDD under-voltage protection point VDDOFF 7.9 8.7 9.5 V 3
VDD restart threshold VDDRESTART 6 6.5 7 V 3
VDD over-voltage protection voltage VDDOVP 21.5 23 24.5 V 3
VDD clamp voltage VDDCLAMP 28 31 35 V 3
Normal operating switching frequency fSW1 54 60 66 KHz 3
Frequency jitter range FD -5 5 % 3
Maximum duty cycle DMAX 74 80 86 % 3
Peak current limit point IPKLIM 1.4 1.6 1.8 A 3
High-voltage input (DRAIN to SOURCE) VHV,MAX 155 V 2
Supply voltage (VDD to SOURCE) VDD,MAX 30 V 2
Power dissipation PD 0.8 W 2
Junction temperature TJ 150 C 2
Storage temperature range TSTG -55 150 C 2
Operating ambient temperature range Tamb -40 125 C 2
Thermal resistance junction-to-ambient θja 140 C/W 2
Thermal resistance junction-to-case (surface) θjc 28 C/W 2

CAD (KiCad official)

  • Symbol: SD4938TR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: sd4938tr-etched.step / sd4938tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sd4938tr.step / sd4938tr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: SILAN(士兰微) datasheet (8 pp, sha256 4906b119d773c253, retrieved 2026-10-19, 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, 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