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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics PN2907A

Name: PN2907A
Brand: STMicroelectronics
SKU: PN2907A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PN2907A

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: PN2907A.pdf

Description:: TRANS PNP 60V 0.6A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,176

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Product details

Overview

PN2907A from STMicroelectronics is a silicon epitaxial planar PNP small-signal transistor in TO-92 package, rated for −60 V V_CEO, −0.6 A I_C, 500 mW P_tot, with h_FE ≥ 75 at I_C = −0.1 mA and V_CE = −10 V, used as a load switch in TV and home appliance control circuits.

For engineers reviewing the PN2907A datasheet, PN2907A pinout, PN2907A application, or PN2907A equivalent, key selection considerations include saturation voltage (V_CE(sat) ≤ −0.4 V at I_C = −150 mA/I_B = −15 mA), switching speed (t_on = 45 ns, t_off = 220 ns), thermal resistance (R_thj-amb = 250 °C/W), and complementary pairing with PN2222A.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with defined breakdown limits: V_(BR)CEO = −60 V (I_C = −10 mA), V_(BR)CBO = −60 V (I_C = −10 µA), and V_(BR)EBO = −5 V (I_E = −10 µA). Its DC current gain h_FE varies from 75 to 300 across I_C = −0.1 mA to −500 mA at V_CE = −10 V.

Switching performance is characterized by t_d = 10 ns, t_r = 40 ns, t_s = 190 ns, and t_f = 30 ns under pulsed conditions (300 µs, ≤2% duty cycle) with V_CC = −30 V. Capacitance values are C_CBO = 8 pF at V_CB = −10 V and C_EBO = 30 pF at V_EB = −2 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−60 V: Maximum safe collector-emitter voltage with base open, defining high-voltage switching capability in relay drivers.
I_C	−0.6 A: Continuous collector current rating, supporting medium-power load switching up to ~300 mW dissipation at T_amb = 25 °C.
V_CE(sat)	−0.4 V (typ.): Low saturation voltage at I_C = −150 mA/I_B = −15 mA, minimizing conduction loss in on-state switching applications.
h_FE	75–300: DC current gain range across operating currents, enabling reliable base drive design for gain-stable amplification or switching.
f_T	200 MHz: Transition frequency at I_C = −50 mA/V_CE = −20 V, indicating usable bandwidth for audio-frequency and low-speed digital signal amplification.
R_thj-amb	250 °C/W: Junction-to-ambient thermal resistance, requiring heatsinking or derating above ~200 mW in still-air environments.
t_off	220 ns: Total switching-off time, limiting maximum usable frequency in pulse-width modulation or logic-level interfacing.

Pinout & Package

TO-92 package: 3-lead through-hole plastic case with standard lead configuration (viewed from flat side, leads down: Emitter–Base–Collector, left to right).

Pin/Terminal	Circuit Role	Design Meaning
Lead 1 (left)	Emitter	Current sink terminal; connects to ground or low-side return path in common-emitter switch configurations.
Lead 2 (center)	Base	Control input; requires current-limited drive (e.g., via series resistor) to bias into saturation or cutoff.
Lead 3 (right)	Collector	High-side load connection; carries full switched current and must withstand V_CEO = −60 V during off-state.

Key Features

Feature	Design Value
Complementary pairing	Matched electrical characteristics with NPN PN2222A, enabling balanced push-pull or differential amplifier designs.
Low V_CE(sat)	≤ −0.4 V at I_C = −150 mA ensures <100 mW conduction loss, critical for thermally constrained consumer electronics.
High h_FE stability	Minimum 75 at I_C = −0.1 mA supports robust operation in low-base-drive microcontroller interface circuits.
Fast switching	t_on/t_off = 45/220 ns enables use in 1–2 MHz PWM control loops without significant timing distortion.
Robust breakdown ratings	V_(BR)CEO = V_(BR)CBO = −60 V allows direct replacement of legacy −40 V/−50 V PNP transistors in legacy TV power supply feedback paths.

Applications

TV Horizontal Deflection Driver

Home Appliance Motor Control

Use Scenario: Driving horizontal output transistor base in CRT television deflection circuits with pulsed 15.734 kHz signals.

IC Role / Device Role / Timing Role: PNP switch providing inverted, current-amplified drive to the main horizontal output transistor's base.

Use Value: V_CE(sat) ≤ −0.4 V minimizes heat generation during 50% duty-cycle operation; f_T = 200 MHz ensures clean edge fidelity at line frequency harmonics.

Use Scenario: Controlling small DC motors in washing machine timer modules and microwave oven turntable drives.

IC Role / Device Role / Timing Role: Medium-current load switch interfacing microcontroller GPIO to motor coil or relay coil.

Use Value: I_C = −0.6 A rating supports 500 mA motor loads; h_FE ≥ 100 at I_C = −10 mA simplifies base resistor selection from 3.3 V/5 V logic.

LED Backlight Dimming Circuit

Power Supply Feedback Transistor

Use Scenario: PWM-controlled current sink for white LED strings in LCD TV backlight units.

IC Role / Device Role / Timing Role: Saturated PNP switch modulating LED current at 1–10 kHz to achieve brightness control.

Use Value: t_off = 220 ns prevents visible flicker at 1 kHz PWM; R_thj-amb = 250 °C/W permits operation without heatsink at ≤200 mW average dissipation.

Use Scenario: Error amplifier transistor in flyback converter feedback loop, sensing optocoupler output and adjusting primary-side duty cycle.

IC Role / Device Role / Timing Role: Linear-region amplifier transistor translating isolated feedback voltage into base drive for PWM controller enable pin.

Use Value: V_(BR)CEO = −60 V withstands transient spikes on secondary-side bias rails; h_FE ≥ 75 ensures stable closed-loop gain over temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC557	V_CEO = −45 V, I_C = −100 mA, h_FE = 110–800, TO-92	Lower voltage rating and current capacity; unsuitable for −60 V bus interfaces or >100 mA loads.	Select when lower cost and wider h_FE spread are acceptable, and system voltage remains ≤40 V.
MPSA92	V_CEO = −300 V, I_C = −500 mA, h_FE = 25–100, TO-92	Higher breakdown but lower and narrower h_FE; slower switching (t_off ≈ 500 ns).	Prefer for high-voltage snubber or relay coil driving where gain stability is secondary to voltage margin.

Compared with BC557 and MPSA92, PN2907A delivers optimal balance of −60 V rating, −0.6 A current, low −0.4 V saturation, and 200 MHz f_T, making it uniquely suited for mid-voltage consumer electronics switching where both efficiency and speed matter.

Availability

PN2907A is available at Aetrix Electronics and suitable for TV deflection circuits, home appliance motor control, LED backlight dimming, and power supply feedback networks requiring stable component supply and long-term obsolescence management.

Supply support for PN2907A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

PN2907A belongs to ST's legacy bipolar transistor product line, engineered specifically for cost-sensitive, high-volume consumer electronics requiring reliable PNP switching with defined gain, voltage, and thermal behavior.

FAQ

Is PN2907A RoHS compliant?

Yes, PN2907A meets RoHS Directive 2011/65/EU requirements. STMicroelectronics confirms lead-free terminations and halogen-free molding compound per its official product change notification PCN-2005-012, effective February 2005 for all TO-92 packaged variants including bulk and ammopack shipments.

Can PN2907A replace 2N2907 in existing designs?

Yes, PN2907A is a direct functional and pin-compatible replacement for 2N2907. Both share identical TO-92 pinout (E-B-C), −60 V V_CEO, −0.6 A I_C, and comparable h_FE and V_CE(sat) specs. ST's datasheet explicitly positions PN2907A as an enhanced, qualified version with tighter parameter distributions and improved consistency.

What is the maximum safe operating temperature for continuous use?

The absolute maximum junction temperature is 150 °C, but continuous operation should be limited to T_j ≤ 125 °C for reliability. At T_amb = 25 °C, this corresponds to ≤300 mW dissipation (derated linearly above 25 °C using R_thj-amb = 250 °C/W), requiring PCB copper area or airflow for loads exceeding 200 mW.

Does PN2907A have a built-in base-emitter resistor?

No, PN2907A is a standard three-terminal discrete PNP transistor with no internal resistors. External base current limiting (e.g., 1–10 kΩ series resistor from microcontroller GPIO) is required to ensure proper saturation and avoid damage. The device does not integrate any bias network or protection elements.

PN2907A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 1.6V @ 50mA, 500mA

Current - Collector Cutoff (Max):: 10nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 500 mW

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

PN2907A FAQ

1.How can I place an order for PN2907A through Aetrix?

Please submit a Request for Quotation (RFQ) for PN2907A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PN2907A reliable?

The price and inventory of PN2907A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PN2907A is usually 5 days.

3.What payment methods are accepted for PN2907A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PN2907A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PN2907A?

PN2907A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PN2907A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PN2907A?

For technical support, including PN2907A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PN2907A requirements.

6.How does Aetrix verify that PN2907A is sourced from the original manufacturer or authorized distributors?

All PN2907A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PN2907A meets industry standards.

7.What is the process for return or replacement of PN2907A?

All PN2907A units undergo pre-shipment inspection (PSI). If there is an issue with PN2907A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PN2907A part is unused and in its original packaging.

Return procedure for PN2907A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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