component
HT3845BRZ
Public Made by Adomby adom
HTCSEMI AC-DC Controllers And 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
markdownHT3845BRZ
HTCSEMI · AC-DC Controllers And Regulators · SOP-8
HT3845BRZ from HTCSEMI, 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 | Compensation | output | This pin is the Error Amplifier output and is made available for loop compensation. |
| 2 | Voltage Feedback | input | This is the inverting input of the Error Amplifier, normally connected to the switching power supply output through a resistor divider, and the Current Sense and Voltage Feedback inputs are rated -0.3 V to +5.5 V. |
| 3 | Current Sense | input | A voltage proportional to inductor current is connected to this input, and the PWM uses it to terminate output switch conduction; the input is rated -0.3 V to +5.5 V. |
| 4 | RT/CT | passive | The oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground, and oscillator operation to 1.0 kHz is possible. |
| 5 | GND | power_in | This pin is the combined control circuitry and power ground. |
| 6 | Output | output | This output directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A and switching at one-half the oscillator frequency. |
| 7 | VCC | power_in | This pin is the positive supply of the control IC, with bias and driver voltages VCC and VC rated at 36 V maximum. |
| 8 | Vref | power_out | This is the 5.0 V reference output that provides charging current for capacitor CT through resistor RT, is short-circuit protected, and can provide in excess of 20 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference Output Voltage (IO = 1.0 mA, TJ = 25C) | Vref | 4.9 | 5 | 5.1 | V | IO = 1.0 mA, TJ = 25C | 2 |
| Total Output Variation over Line, Load, & Temperature | Vref | 4.82 | 5.18 | V | 2 | ||
| Line Regulation | 2 | 20 | mV | VCC = 12 V to 25 V | 2 | ||
| Load Regulation | 3 | 25 | mV | IO = 1.0 mA to 20 mA | 2 | ||
| Output Short Circuit Current | ISC | -30 | -85 | -180 | mA | 2 | |
| Oscillator Frequency TJ = 25C | fOSC | 49 | 52 | 55 | kHz | TJ = 25C, RT = 10 k, CT = 3.3 nF | 2 |
| Oscillator Frequency TA = Tlow to Thigh | fOSC | 48 | 56 | kHz | TA = 0C to +70C, RT = 10 k, CT = 3.3 nF | 2 | |
| Oscillator Frequency TJ = 25C (RT = 6.2 k, CT = 1.0 nF) | fOSC | 225 | 250 | 275 | kHz | TJ = 25C, RT = 6.2 k, CT = 1.0 nF | 2 |
| Frequency Change with Voltage | MfOSC/MV | 0.2 | 1 | % | VCC = 12 V to 25 V | 2 | |
| Discharge Current TJ = 25C | Idischg | 7.8 | 8.3 | 8.8 | mA | VOSC = 2.0 V, TJ = 25C | 3 |
| Discharge Current TA = Tlow to Thigh (HT384XB) | Idischg | 7.6 | 8.8 | mA | VOSC = 2.0 V, TA = Tlow to Thigh (HT384XB) | 3 | |
| Voltage Feedback Input | VFB | 2.42 | 2.5 | 2.58 | V | VO = 2.5 V | 3 |
| Input Bias Current | IIB | -0.1 | -2 | µA | VFB = 5.0 V | 3 | |
| Open Loop Voltage Gain | AVOL | 65 | 90 | dB | VO = 2.0 V to 4.0 V | 3 | |
| Unity Gain Bandwidth | BW | 0.7 | 1 | MHz | TJ = 25C | 3 | |
| Power Supply Rejection Ratio (Error Amplifier) | PSRR | 60 | 70 | dB | VCC = 12 V to 25 V | 3 | |
| Error Amp Output Current Sink | ISink | 2 | 12 | mA | VO = 1.1 V, VFB = 2.7 V | 3 | |
| Error Amp Output Current Source | ISource | -0.5 | -1 | mA | VO = 5.0 V, VFB = 2.3 V | 3 | |
| Error Amp Output Voltage Swing High State | VOH | 5 | 6.2 | V | RL = 15 k to ground, VFB = 2.3 V | 3 | |
| Error Amp Output Voltage Swing Low State (HT384XB) | VOL | 0.8 | 1.1 | V | RL = 15 k to Vref, VFB = 2.7 V | 3 | |
| Current Sense Input Voltage Gain (HT384XB) | AV | 2.85 | 3 | 3.15 | V/V | Notes 9 & 10 | 3 |
| Maximum Current Sense Input Threshold (HT384XB) | Vth | 0.9 | 1 | 1.1 | V | Note 9: measured at latch trip point with VFB = 0 V | 3 |
| Current Sense Input Bias Current | IIB | -2 | -10 | µA | 3 | ||
| Propagation Delay (Current Sense Input to Output) | tPLH(In/Out) | 150 | 300 | ns | 3 | ||
| Output Voltage Low State (ISink = 20 mA) | VOL | 0.1 | 0.4 | V | ISink = 20 mA | 3 | |
| Output Voltage Low State (ISink = 200 mA, HT384XB) | VOL | 1.6 | 2.2 | V | ISink = 200 mA | 3 | |
| Output Voltage High State (ISource = 20 mA, HT384XB) | VOH | 13 | 13.5 | V | ISource = 20 mA | 3 | |
| Output Voltage High State (ISource = 200 mA) | VOH | 12 | V | ISource = 200 mA | 3 | ||
| Output Voltage with UVLO Activated | VOL(UVLO) | 0.1 | 1.1 | V | VCC = 6.0 V, ISink = 1.0 mA | 3 | |
| Output Voltage Rise Time | tr | 50 | 150 | ns | CL = 1.0 nF, TJ = 25C | 3 | |
| Output Voltage Fall Time | tf | 50 | 150 | ns | CL = 1.0 nF, TJ = 25C | 3 | |
| Startup Threshold (UCX845B) | Vth | 7.8 | 8.4 | 9 | V | UCX845B row | 3 |
| Minimum Operating Voltage After Turn-On (UCX845B) | VCC(min) | 7 | 7.6 | 8.2 | V | UCX845B row | 3 |
| Maximum Duty Cycle (HT384XB) | DC(max) | 47 | 48 | 50 | % | 4 | |
| Minimum Duty Cycle | DC(min) | 0 | % | 4 | |||
| Power Supply Current Startup (UCX845B) | ICC | 0.3 | 0.5 | mA | VCC = 6.5 V for UCX845B | 4 | |
| Power Supply Current Operating | ICC | 12 | 17 | mA | Note 11 | 4 | |
| Power Supply Zener Voltage | VZ | 30 | 36 | V | ICC = 25 mA | 4 | |
| Bias and Driver Voltages (VCC, VC) | VCC, VC | 36 | V | Zero series impedance | 2 | ||
| Total Power Supply and Zener Current | ICC + IZ | 30 | mA | 2 | |||
| Output Current, Source or Sink | IO | 1 | A | Note 2 | 2 | ||
| Output Energy (Capacitive Load per Cycle) | W | 5 | µJ | 2 | |||
| Current Sense and Voltage Feedback Inputs | Vin | -0.3 | 5.5 | V | 2 | ||
| Error Amp Output Sink Current | IO | 10 | mA | 2 | |||
| Maximum Power Dissipation (SOIC-8, D1 suffix) | PD | 862 | mW | TA = 25C | 2 | ||
| Thermal Resistance, Junction-to-Air (SOIC-8, D1 suffix) | RSJA | 145 | C/W | 2 | |||
| Operating Junction Temperature | TJ | 150 | C | 2 | |||
| Operating Ambient Temperature (HT3844B, HT3845B) | TA | 0 | 70 | C | HT3844B, HT3845B | 2 | |
| Storage Temperature Range | Tstg | -65 | 150 | C | 2 |
CAD (KiCad official)
- Symbol:
HT3845BRZ - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
ht3845brz-etched.step/ht3845brz-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ht3845brz.step/ht3845brz.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HTCSEMI datasheet (16 pp, sha256
f6c539a7600d4bdb, retrieved 2026-10-17, 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).