# SN75176BM

**HGSEMI** · RS-485 / RS-422 ICs · SOP-8

SN75176BM from HGSEMI, 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 | RO | output | Receiver output: when /RE is low, RO is high if A - B ≥ -50mV and low if A - B ≤ -200mV. |
| 2 | /RE | input | Receiver output enable: driving /RE low enables RO, and RO is high impedance when /RE is high; driving /RE high and DE low puts the device into low-power shutdown mode. |
| 3 | DE | input | Driver output enable: driving DE high enables the driver outputs, which are high impedance when DE is low; driving /RE high and DE low puts the device into low-power shutdown mode. |
| 4 | DI | input | Driver input: with DE high, a low on DI forces the noninverting output low and the inverting output high. |
| 5 | GND | power_in | Ground reference for the device. |
| 6 | A | bidirectional | Noninverting receiver input and noninverting driver output; the receiver input resistance is specified for -7V ≤ VCM ≤ 12V. |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output; the receiver input resistance is specified for -7V ≤ VCM ≤ 12V. |
| 8 | VCC | power_in | Positive supply; the absolute maximum supply voltage is +7V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Interface |
| 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 |  |  | 7 | V |  | 3 |
| Control Input Voltage (/RE, DE) |  | -0.3 |  |  | V |  | 3 |
| Driver Input Voltage (DI) |  | -0.3 |  |  | V |  | 3 |
| Driver Output Voltage (A,B) |  | -13 |  | 13 | V |  | 3 |
| Receiver Input Voltage (A,B) |  | -13 |  | 13 | V |  | 3 |
| Receiver Output Voltage (RO) |  | -0.3 |  |  | V |  | 3 |
| Operating Temperature (SN75176B) | TOPR | 0 |  | 70 | ℃ |  | 3 |
| Storage Temperature | TSTG | -65 |  | 150 | ℃ |  | 3 |
| Lead Temperature (Soldering, 10 seconds) |  |  |  | 260 | ℃ | Soldering, 10 seconds | 3 |
| Differential Driver Output | VOD2 | 1.8 |  |  | V |  | 4 |
| Change in Magnitude of Differential Output Voltage | ΔVOD |  |  | 0.2 | V |  | 4 |
| Driver Common-Mode Output Voltage | VOC | 1 |  | 3 | V |  | 4 |
| Change in Magnitude of Common-Mode Voltage | ΔVOC |  |  | 0.2 | V |  | 4 |
| Input High Voltage | VIH | 2 |  |  | V | DE, DI, /RE | 4 |
| Input Low Voltage | VIL |  |  | 0.8 | V | DE, DI, /RE | 4 |
| Driver Input Current (A and B) | IIN1 |  |  | 150 | µA | VIN=12V DE=0V, Vcc=0V/5.25V | 4 |
| Driver Input Current (A and B) | IIN1 | -150 |  |  | µA | VIN=-7V | 4 |
| Driver Short-Circuit Output Current | IOSD | -100 |  | 100 | mA | A and B Short-Circuit | 4 |
| Receiver Differential Threshold Voltage | VTH | -200 | -125 | -50 | mV | -7V≤VCM≤12V | 4 |
| Receiver Output Low Voltage | VOL |  |  | 0.4 | V | IO=4mA, VID=-200mV | 4 |
| Three-State Output Current at Receiver | IOZR | -1 |  | 1 | µA | 0.4V≤Vo≤2.4V | 4 |
| Receiver Input Resistance | RIN | 96 |  |  | KΩ | -7V≤VCM≤12V | 4 |
| Receiver Output Short-Circuit Current | IOSR | -7 |  | 100 | mA | 0V≤VRO≤VCC | 4 |
| Supply Current (DE=VCC) | ICC |  | 450 | 900 | µA | DE=VCC No Load /RE=DI=VCC/GND | 4 |
| Supply Current (DE=GND) | ICC |  | 450 | 600 | µA | DE=GND | 4 |
| Supply Current in Shutdown Mode | ISHDN |  |  | 10 | µA | DE=GND, /RE=VCC, DI=VCC/GND | 4 |
| Driver Input to Output | tDPLH |  | 30 | 60 | ns | Figure 3 and 5, RDIFF=54Ω, CL1=CL2=100pF | 5 |
| Driver Output Skew | tDSKEW |  |  | 20 | ns |  | 5 |
| Driver Rise or Fall Time | tDR, tDF |  |  | 30 | ns |  | 5 |
| Maximum Data Rate | FMAX | 10 |  |  | Mbps |  | 5 |
| Driver Enable to Output High | tDZH |  |  | 70 | ns | Figure 4 and 6, CL=100pF S2 closed | 5 |
| Driver Disable Time from High | tDHZ |  |  | 70 | ns |  | 5 |
| Driver Enable to Output Low | tDZL |  |  | 70 | ns | Figure 4 and 6, CL=100pF S1 closed | 5 |
| Driver Disable Time from Low | tDLZ |  |  | 70 | ns |  | 5 |
| Receiver Input to Output | tRPLH, tRPHL |  | 90 | 250 | ns | Figure 7 and 9, /VID/ ≥ 2.0V, rise and fall time of VID≦15ns | 5 |
| Receiver Enable to Output Low | tRZL |  | 30 | 70 | ns | Figure 2 and 8, CRL=15pF S1 closed | 5 |
| Receiver Disable Time from Low | tRLZ |  | 30 | 70 | ns |  | 5 |
| Receiver Enable to Output High | tRZH |  | 30 | 70 | ns | Figure 2 and 8, CRL=15pF S2 closed | 5 |
| Receiver Disable Time from High | tRHZ |  | 30 | 70 | ns |  | 5 |
| Time to Shutdown | tSHDN |  | 200 | 600 | ns |  | 5 |
| Receiver Differential Skew | tRSKD |  | 30 |  | ns |  | 5 |
| Receiver Input Hysteresis | ΔVTH |  | 40 |  | mV |  | 4 |
| DI Input Hysteresis | VHYS |  | 100 |  | mV |  | 4 |

## CAD (KiCad official)

- Symbol: `SN75176BM`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `sn75176bm-etched.step` / `sn75176bm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn75176bm.step` / `sn75176bm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8770707219660980224) (11 pp, sha256 `7d4bdeed8f8cd636`, retrieved 2026-10-19, 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/sn75176bm-datasheet.pdf)