PNP transistor, -20V VCEO, -1A Ic, 1.5W, hFE 85-375, SOT-223-4, NPN complement BCP68, -65~150°C
17474
Image for reference only
BCP69T1G
SOT-223-4 / TO-261-4 (6.5 x 3.5 x 1.75 mm, 2.3mm pitch, tab = collector pins 2&4)
The BCP69T1G from onsemi is a PNP medium-power bipolar junction transistor in a SOT-223-4 (TO-261-4) surface-mount package. Key specs include -20 V VCEO, -1.0 A continuous collector current, 1.5 W power dissipation at TA=25°C, 85-375 hFE DC current gain range, -500 mV max VCE(sat) at IC=-1.0 A, 60 MHz transition frequency, and -65°C to +150°C operating temperature range. The NPN complement is BCP68. The T1G suffix denotes 1000-unit tape-and-reel, Pb-free, halogen-free, RoHS-compliant packaging.
The BCP69T1G from onsemi is a PNP general-purpose bipolar junction transistor in the industry-standard SOT-223-4 surface-mount package. It is designed for low-voltage, medium-current switching and amplification applications. The device offers 1.5-W power dissipation and 1-A collector current in a compact footprint, making it one of the most popular medium-power SMD transistors.
The SOT-223-4 package features a large collector tab (pins 2 and 4) that serves as both the electrical collector connection and the primary thermal path. The flat mounting surface and formed leads provide improved thermal conduction to the PCB and allow visual inspection of solder joints — advantages over smaller packages like SOT-23 for power applications.
The hFE range of 85 to 375 (at IC = -500 mA, VCE = -1 V) provides adequate gain for direct drive from MCU GPIO pins. At IC = -1.0 A, hFE drops to 50 minimum, but remains usable with sufficient base drive. The 500-mV maximum VCE(sat) at IC = -1.0 A and IB = -100 mA is typical for a general-purpose transistor — not as low as dedicated low-VCE(sat) types (e.g., PBSS303PX at <50 mV), but adequate for non-critical switching applications. The NPN complement (BCP68) enables push-pull output stage, H-bridge, and complementary driver designs. Both devices share the same SOT-223-4 footprint and similar electrical characteristics, simplifying complementary circuit design. An automotive-qualified version (NSVBCP69T1G) is available with AEC-Q101 qualification and PPAP capability for automotive applications requiring unique site and control change requirements. The 60-MHz transition frequency limits the BCP69 to audio and low-frequency switching applications. For higher-frequency operation, consider the BCF29 (200 MHz) or BFS17 (400 MHz) in similar packages.
**PNP Bipolar Junction Transistor:** The BCP69 uses a PNP structure where current flows from emitter to collector when the base-emitter junction is forward-biased (VBE negative relative to emitter). Holes are injected from the emitter into the base region, and most of these holes are swept across the thin base into the collector, producing collector current proportional to base current (IC = hFE × IB).
**Saturation Operation:** In switching applications, the transistor is driven into saturation by applying sufficient base current (IB > IC/hFE). In saturation, VCE drops to VCE(sat), typically 100-500 mV depending on IC and IB. The BCP69 specifies VCE(sat) = 500 mV max at IC = -1.0 A with IB = -100 mA (forced hFE = 10). Overdriving the base (lower forced hFE) reduces VCE(sat) at the expense of increased base current and slower turn-off.
**Thermal Management:** The SOT-223-4 package provides RθJA = 83.3°C/W when mounted on a standard FR4 PCB with a minimum collector pad area of 0.93 sq. in. The 1.5-W power dissipation rating at TA = 25°C corresponds to a junction temperature of approximately 150°C. For reliable operation, junction temperature should be kept below 125°C, limiting practical dissipation to about 1.2 W at ambient temperatures up to 50°C.
**Darlington Alternative:** When higher current gain is needed, the BCP69 can be used as the output transistor in a Darlington configuration with a small-signal PNP pre-driver, achieving effective hFE > 1000 at 1 A.
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | Base | I | Base input; controls collector current; VBE(on) = -1.0V max at IC=-1A; drive with IB > IC/hFE for saturation |
| 2 | Collector (tab) | O | Collector; large tab for thermal dissipation; must be connected to pin 4 on PCB; solder tab to copper pour with thermal vias |
| 3 | Emitter | P | Emitter; current flows in from emitter to collector when base is driven low relative to emitter |
| 4 | Collector | O | Collector (parallel with pin 2/tab); both collector pins must be connected together on PCB |
| Application | Description |
|---|---|
| Low-Side PNP Load Switch | Switch 5V/3.3V loads (relays, LEDs, motors) from high-side; MCU GPIO drives base through resistor; PNP connects load to VCC; VCE(sat) of 500mV at 1A; pair with NPN pre-driver for logic-level control from MCU |
| Linear Voltage Regulator Pass Element | Use as pass transistor in discrete LDO regulator; op-amp drives base; emitter connected to unregulated supply; collector delivers regulated output; 1.5W dissipation adequate for 500mA at 3V dropout; heat-sink PCB copper pour required |
| Push-Pull Audio Output | Complementary push-pull with BCP68 (NPN); Class-AB bias for audio amplifier; 1A peak per device; 60MHz fT adequate for audio bandwidth; total harmonic distortion depends on bias point and feedback |
| Model | Manufacturer | Compatibility | Key Difference |
|---|---|---|---|
| BCP68T1G | onsemi | Complementary Pair | NPN complement; same SOT-223-4 package; 20V VCEO; 1A Ic; hFE 85-375; use with BCP69 for push-pull and bridge circuits |
| PBSS303PX | Nexperia | Competitive Upgrade | PNP low-VCE(sat) transistor; SOT-223; -30V; -3.5A; VCE(sat) <50mV at -1A; much lower saturation voltage; use for high-efficiency switching |
| NSVBCP69T1G | onsemi | Automotive Version | Same die as BCP69T1G; AEC-Q101 qualified; PPAP capable; use for automotive applications requiring qualification |
| BC856B | Nexperia | Smaller Package Alternative | PNP transistor; -65V; -100mA; hFE 220-475; SOT-23-3; much smaller but lower current; use for signal-level switching |
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
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