Small HBridge is a compact dual full-bridge motor driver board built around the Allegro A4954 PWM motor driver IC. Onboard linear regulation, current-sense trim, and protection circuitry make it a self-contained driver stage for small DC motors — designed to be dropped into a larger system via JST connectors rather than used standalone.
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🔝 Top Side 
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🔻 Bottom Side 
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The board's real STEP-exported 3D model is included as assets/Hbridge.step.obj / assets/Hbridge.step.mtl — used to render an actual (not procedural) 3D view of this board on the portfolio site.
| Goal | Specification |
|---|---|
| ⚙️ Motor Driver | Allegro A4954 dual full-bridge PWM driver (TSSOP-16EP) |
| 🔌 System Interface | JST connectors (2-pin and 5-pin variants) for power/signal |
| 🎚️ Current Sense Trim | Bourns TC33 trimpot |
| 🛡️ Protection | Bidirectional Zener + Bourns DO214AC SMA diode |
| ⚡ Onboard Regulation | Diodes Inc AP7381 — 150mA low-quiescent-current fast-transient LDO |
| Reference | Part | Function |
|---|---|---|
| Motor driver | Allegro A4954 (TSSOP-16EP) | Dual full-bridge PWM motor driver |
| LDO regulator | Diodes Inc AP7381 | 150mA low-IQ fast-transient linear regulator |
| Trim | Bourns TC33 | Potentiometer (current-sense trim) |
| Protection diode | Bourns DO214AC (SMA) | Bidirectional/flyback protection |
| Connectors | JST BM02B-GHS-TBT, BM02B-PASS-TF, BM05B-GHS-TBT | Power/signal I/O |
| Passives | MLCC (0402/0603) + aluminum electrolytic caps, chip resistors | Decoupling/filtering |
PRJ-PCB-1004-2024-HBridge.github.io/
│
├── assets/
│ ├── HBridge-TOP.png ← Top view render (PNG)
│ ├── HBridge-BOT.png ← Bottom view render (PNG)
│ ├── Hbridge.step.obj ← Real 3D model (from STEP export)
│ └── Hbridge.step.mtl ← Material definitions for the model
│
├── index.html ← Interactive PCB/BOM viewer
└── README.md ← This file
| Resource | URL |
|---|---|
| 🌐 Interactive PCB View | hiibrarahmad.github.io/PRJ-PCB-1004-2024-HBridge.github.io |
| 👤 Designer | github.com/hiibrarahmad |
PRJ-PCB-1004-2024-HBridge
Small H-Bridge Motor Driver Board · Designed by Ibrar Ahmad
© 2026 ibrar Ahmad. All Rights Reserved.