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MJD127G TO-252 PNP Darlington Transistor — TIP127 / MJD127 Series (5pcs)
MJD127G TO-252 PNP Darlington Transistor TIP127 / MJD127 Series (5pcs)
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MJD127G — TO-252 PNP Darlington Transistor (TIP127 / MJD127 Series)
The MJD127G is a PNP Darlington transistor in compact TO-252 SMD package, part of the TIP127 / MJD127 series. With a collector current of 5A, collector-emitter voltage of 100V, and Darlington gain exceeding hFE > 1000, it's ideal for high-current switching, motor drivers, and relay drivers controlled by low-current microcontroller signals. This listing provides 5 pieces.
Key Specifications
| Parameter | Value |
|---|---|
| Part Numbers | MJD127G / MJD127 / TIP127 (equiv.) |
| Type | PNP Darlington BJT |
| Package | TO-252 (D-PAK, SMD) |
| Collector-Emitter Voltage (Vceo) | 100V |
| Collector Current (Ic) | 5A (continuous) |
| Power Dissipation (Pd) | 20W (with heatsink/PCB copper) |
| DC Current Gain (hFE) | >1000 (Darlington) |
| Saturation Voltage (Vce(sat)) | ~2V @ 3A |
| Built-in Flyback Diode | Yes (base-emitter) |
| Operating Temperature | -55°C to +150°C |
| Quantity | 5 PCS |
MJD127 vs TIP127 Comparison
| Feature | MJD127G (TO-252) | TIP127 (TO-220) |
|---|---|---|
| Package | TO-252 SMD | TO-220 Through-hole |
| Vceo | 100V | 100V |
| Ic | 5A | 5A |
| Pd | 20W | 65W (with heatsink) |
| PCB Mount | SMD (compact) | Through-hole |
Why Choose MJD127G?
- ✅ Darlington gain hFE > 1000 — 5A load switched by <5mA base current from MCU GPIO
- ✅ TO-252 SMD package — compact footprint, PCB-mountable without heatsink at moderate currents
- ✅ 100V Vceo — handles inductive load voltage spikes safely
- ✅ Built-in flyback diode — protects against inductive kickback from motors and relays
- ✅ TIP127 pin-compatible — SMD equivalent for existing TIP127 designs
Compatible With / Works With
- Arduino/ESP32 GPIO high-current switching (5V/3.3V base drive)
- Relay coil driver (12V relay, 100mA coil current)
- DC motor driver (low-speed, low-current motors up to 5A)
- LED array driver (high-current LED matrix, common-anode)
- Complementary NPN pair: MJD117G (NPN Darlington, TO-252)
Typical Applications
- Relay Driver — Arduino GPIO drives 12V relay coil via MJD127G PNP switch
- Motor Driver — high-side PNP switch for DC motor in H-bridge configuration
- LED Array Driver — common-anode LED matrix row driver with 5A capability
- Load Switch — high-side switch for 12V/24V loads controlled by 3.3V MCU
- Audio Power Stage — PNP output transistor in class-AB amplifier
FAQ
Q: Can MJD127G replace TIP127 directly?
A: Electrically yes — same Vceo, Ic, and hFE. Package differs: MJD127G is TO-252 (SMD), TIP127 is TO-220 (through-hole). Use MJD127G for SMD PCB designs; TIP127 for through-hole or breadboard.
Q: Does MJD127G need a base resistor when driven from Arduino?
A: Yes. Calculate base resistor: Rb = (Vcc - Vbe) / Ib. For 5V Arduino driving 1A load: Ib = 1A / 1000 = 1mA, Rb = (5V - 1.4V) / 1mA = 3.6kΩ. Use 3.3kΩ or 4.7kΩ.
Q: What is the Vce(sat) of MJD127G?
A: ~2V at 3A (Darlington transistors have higher saturation voltage than single BJTs). For low-dropout switching, consider a MOSFET (IRF4905 P-channel) instead.
Package Contents
- 5× MJD127G TO-252 PNP Darlington Transistor
