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U2043G
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UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOP-8. 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
markdownU2043G
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOP-8
U2043G from UTC Unisonic Tech, 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 | GND | power_in | IC ground, the reference point for the device; in case of battery reversal, external resistor R4 to ground protects the IC against damage. |
| 2 | VSS | power_in | Supply voltage VSS (+10); operating range 9 to 15 V with an absolute maximum rating of 16.5 V, and the connection must keep the resistance from VSS to pin 6 lower than to pin 2. |
| 3 | REL | output | Relay control output, a high-side driver with low saturation voltage (1.0 V max at 150 mA with VSS = 9 V) that drives a relay coil of at least 60 Ω, with output current rated at 0.3 A. |
| 4 | OSC | passive | Oscillator C1 connection; flashing frequency is set by R1 and C1 with C1 ≤ 47 µF. |
| 5 | OSC | passive | Oscillator R1 connection; R1 must be between 6.8 kΩ and 510 kΩ. |
| 6 | VSS | power_in | Supply voltage sense input; a minimized layer resistance from the shunt to pin 6 is recommended for accurate lamp current monitoring. |
| 7 | LD | input | Lamp failure detection input to comparator K1 with a reference of about 77 mV at VSS = 12 V, monitoring lamp current through external shunt R3 (about 29 mΩ in the example). |
| 8 | SI | input | Start input; flashing starts when the voltage at this pin is below VSS − 5 V (flasher switch closed), and the pin must stay above the K2 threshold during bright phase and below K3 during dark phase. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| 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 Range | VSS(+10) | 9 | 15 | V | 3 | ||
| Frequency Determining Resistor | R1 | 6.8 | 510 | kΩ | 3 | ||
| Frequency Determining Capacitor | C1 | 47 | μF | 3 | |||
| Frequency Tolerance | Δf1 | -5 | 5 | % | Normal flashing, f1 excluding the tolerance of R1 and C1 | 3 | |
| Bright Period | Δf1 | 47 | 53 | % | Basic frequency f1 | 3 | |
| Bright Period | Δf2 | 37 | 45 | % | Control frequency f2 | 3 | |
| Frequency Increase | f2 | 2.15 | 2.3 | xf1 | Lamp outage | 3 | |
| Control Signal Threshold VR3 | VR3 | 75 | 86 | 97 | mV | VSS = 15V Pin 7 | 3 |
| Control Signal Threshold VR3 | VR3 | 56 | 66 | 76 | mV | VSS = 9V | 3 |
| Control Signal Threshold VR3 | VR3 | 66 | 77 | 87 | mV | VSS = 12V | 3 |
| Leakage Resistance | RLEAK | 2 | 5 | kΩ | 10a to GND | 3 | |
| Lamp Load | PL | 10 | W | 3 | |||
| Supply current, dark phase or stand-by | ISS | 4.5 | 8 | mA | Dark phase or stand-by | 3 | |
| Supply current, bright phase | ISS | 7 | 11 | mA | Bright phase | 3 | |
| Relay Coil Resistance | RL | 60 | Ω | 3 | |||
| Relay Output Reverse Current | IOUT | 0.1 | mA | 3 | |||
| Start Delay | tON | 10 | ms | First bright phase | 3 | ||
| Relay Output Saturation voltage | VOUT | 1 | V | IOUT=150mA, VSS = 9V | 3 | ||
| Supply Voltage Pins 2, 6 | VSS | 16.5 | V | Pins 2, 6 | 3 | ||
| Surge Forward Current | IFSM | 1.5 | A | tp = 0.1ms, Pins 2, 6 | 3 | ||
| Surge Forward Current | IFSM | 1 | A | tp = 2ms, Pins 2, 6 | 3 | ||
| Surge Forward Current | IFSM | 50 | mA | tp = 2ms, Pin 8 | 3 | ||
| Output Current Pin 3 | IOUT | 0.3 | A | 3 | |||
| Power Dissipation SOP-8 | PD | 340 | mW | TA = 95°C | 3 | ||
| Power Dissipation SOP-8 | PD | 560 | mW | TA = 60°C | 3 | ||
| Junction Temperature | TJ | 150 | °C | 3 | |||
| Ambient Temperature | TA | -40 | 95 | °C | 3 | ||
| Storage Temperature | TSTG | -55 | 150 | °C | 3 | ||
| Thermal Resistance (Junction to Ambient) SOP-8 | θJA | 160 | K/W | 3 |
CAD (KiCad official)
- Symbol:
U2043G - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
u2043g-etched.step/u2043g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);u2043g.step/u2043g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (4 pp, sha256
26a177ed3d1eb0c4, retrieved 2026-10-18, 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).