Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi 2N5771

Name: 2N5771
Brand: onsemi
SKU: 2N5771
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2N5771

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N5771.pdf

Description:: TRANS PNP 15V 0.2A TO-92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,272

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

2N5771 from Fairchild Semiconductor is a PNP bipolar junction transistor designed for very high-speed saturated switching at collector currents up to 100 mA, with V_CEO = 15 V, I_C = 200 mA continuous, and t_off = 20 ns. It is commonly used in pulse-width modulation circuits, digital logic level translation, and low-power switching regulators.

For engineers reviewing the 2N5771 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical characteristics, TO-92 package mapping, thermal resistance values (R_θJA = 357 °C/W), switching timing data, and validated alternative transistors for design-in decisions.

Technical Context

The 2N5771 operates as a discrete PNP BJT optimized for fast saturation and recovery, featuring h_FE = 35–120 at I_C = 1–50 mA and V_CE = 0.3–1.0 V. Its small-signal current gain h_fe = 8.5 MHz at 10 mA/10 V confirms suitability for medium-frequency switching rather than RF amplification.

Thermal performance is defined by R_θJC = 125 °C/W and R_θJA = 357 °C/W on FR-4 PCB (1.6" × 1.6"), with maximum junction temperature of +150 °C. All voltage and current ratings carry negative polarity per PNP convention, and absolute maximums are validated under steady-state conditions only.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	15 V - Maximum safe collector-emitter voltage before breakdown under open-base condition
I_C (continuous)	200 mA - Sustained collector current capability without thermal derating at 25°C
t_off	20 ns - Turn-off delay time critical for >5 MHz switching applications
h_FE @ 10 mA	50–120 - DC current gain range enabling predictable base drive sizing
V_CE(sat) @ 10 mA	0.18 V - Low saturation voltage minimizes conduction loss in switching mode
C_cb	3.0 pF - Collector-base capacitance limiting high-frequency Miller effect
R_θJA	357 °C/W - Junction-to-ambient thermal resistance on standard FR-4 board

Pinout & Package

2N5771 is packaged in TO-92 plastic case with straight leads and no lead clip. Pin identification follows standard TO-92 orientation: flat side facing viewer, leads down, left-to-right = Emitter (E), Base (B), Collector (C).

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current source terminal for PNP operation	Connected to higher potential rail; base-emitter forward bias initiates conduction
B (Base)	Control electrode	Receives negative current relative to emitter to saturate transistor; requires current-limiting resistor
C (Collector)	Current sink terminal	Connected to load and lower-potential node; carries switched load current when saturated

Key Features

Feature	Design Value
Very high-speed switching	20 ns turn-off time enables use in PWM controllers operating above 5 MHz
Saturated switching optimization	V_CE(sat) ≤ 0.18 V at I_C = 10 mA ensures minimal power dissipation during ON state
Wide operating temperature range	−55°C to +150°C junction range supports industrial and automotive under-hood environments
Low leakage performance	I_CBO ≤ 10 nA at V_CB = 8 V reduces standby current in battery-powered systems
TO-92 mechanical compatibility	Standard through-hole footprint allows drop-in replacement in legacy designs using PN2907 or MPSA92

Applications

DC-DC Converter Switching Stage	Digital Logic Level Shifter
Use Scenario: Used as low-side switch in non-isolated buck converter feedback path or gate driver stage. IC Role / Device Role / Timing Role: PNP BJT acting as saturated switch controlling MOSFET gate or optocoupler LED current. Use Value: 20 ns t_off and 0.18 V V_CE(sat) reduce switching losses and improve efficiency at 1–5 MHz frequencies.	Use Scenario: Translates TTL/CMOS logic levels between 3.3 V and 5 V domains in microcontroller I/O interfaces. IC Role / Device Role / Timing Role: Discrete level translator providing inverted output with controlled rise/fall times. Use Value: h_FE ≥ 50 at 1 mA ensures reliable saturation with minimal base drive, reducing MCU GPIO loading.
LED Driver for Indicator Circuits	Pulse Generator Output Stage
Use Scenario: Drives multiple indicator LEDs in instrumentation panels requiring low quiescent current. IC Role / Device Role / Timing Role: Constant-current switch regulating LED brightness via base current control. Use Value: I_C = 200 mA rating supports parallel LED strings; V_BE(sat) = 0.75–0.95 V simplifies bias network design.	Use Scenario: Forms part of monostable multivibrator or Schmitt trigger output buffer in test equipment. IC Role / Device Role / Timing Role: Fast-switching element shaping clean digital pulses with sharp edges. Use Value: C_cb = 3.0 pF and t_on = 15 ns preserve signal integrity up to 10 MHz repetition rates.

DC-DC Converter Switching Stage

Digital Logic Level Shifter

Use Scenario: Used as low-side switch in non-isolated buck converter feedback path or gate driver stage.

IC Role / Device Role / Timing Role: PNP BJT acting as saturated switch controlling MOSFET gate or optocoupler LED current.

Use Value: 20 ns t_off and 0.18 V V_CE(sat) reduce switching losses and improve efficiency at 1–5 MHz frequencies.

Use Scenario: Translates TTL/CMOS logic levels between 3.3 V and 5 V domains in microcontroller I/O interfaces.

IC Role / Device Role / Timing Role: Discrete level translator providing inverted output with controlled rise/fall times.

Use Value: h_FE ≥ 50 at 1 mA ensures reliable saturation with minimal base drive, reducing MCU GPIO loading.

LED Driver for Indicator Circuits

Pulse Generator Output Stage

Use Scenario: Drives multiple indicator LEDs in instrumentation panels requiring low quiescent current.

IC Role / Device Role / Timing Role: Constant-current switch regulating LED brightness via base current control.

Use Value: I_C = 200 mA rating supports parallel LED strings; V_BE(sat) = 0.75–0.95 V simplifies bias network design.

Use Scenario: Forms part of monostable multivibrator or Schmitt trigger output buffer in test equipment.

IC Role / Device Role / Timing Role: Fast-switching element shaping clean digital pulses with sharp edges.

Use Value: C_cb = 3.0 pF and t_on = 15 ns preserve signal integrity up to 10 MHz repetition rates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA92	V_CEO = 30 V, I_C = 500 mA, t_off = 500 ns - higher voltage rating but slower switching	Better suited for high-voltage linear amplification; less optimal for >1 MHz switching	Select when V_CE stress exceeds 15 V; avoid if t_off < 50 ns required
PN2907	V_CEO = 60 V, I_C = 600 mA, t_off = 250 ns - higher power handling but significantly slower	Preferred for general-purpose switching where speed is secondary to current capacity	Choose for cost-sensitive, low-frequency (<100 kHz) applications with higher voltage margin needs

Compared with MPSA92 and PN2907, the 2N5771 delivers superior high-frequency switching performance (t_off = 20 ns) at lower voltage/current ratings, making it ideal for compact, fast-response digital and SMPS control stages where thermal budget and layout space are constrained.

Availability

2N5771 is available at Aetrix Electronics and suitable for DC-DC converter design, digital logic interface development, LED driver implementation, and pulse generator circuitry requiring stable component supply across prototyping, NPI, and production volumes.

Supply support for 2N5771 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

Fairchild Semiconductor was a U.S.-based analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016. Known for high-reliability power and signal products.

The 2N5771 belongs to Fairchild's legacy PNP switching transistor family, engineered specifically for high-speed saturated operation in compact consumer, industrial, and communications equipment.

FAQ

What is the maximum operating temperature for the 2N5771?

The 2N5771 has a specified operating junction temperature range of −55°C to +150°C. This wide range allows deployment in harsh environments such as automotive engine compartments or industrial motor controls. Derating begins above 25°C ambient, with total device dissipation dropping linearly at 2.8 mW/°C for the TO-92 package. Always verify thermal design using R_θJA = 357 °C/W on standard FR-4 PCB.

Is the 2N5771 pin-compatible with the MMBT5771?

Yes, the 2N5771 and MMBT5771 share identical electrical specifications and PNP transistor functionality, but differ in packaging: 2N5771 uses TO-92 while MMBT5771 uses SOT-23. Their pinouts are not interchangeable-TO-92 has E-B-C left-to-right (flat side facing), whereas SOT-23 has E-B-C in different physical order. Board layout must match the specific package variant selected.

What is the typical V_CE(sat) of the 2N5771 at 50 mA collector current?

The 2N5771 exhibits V_CE(sat) = 0.6 V at I_C = 50 mA and I_B = 5.0 mA, as confirmed in the official Fairchild datasheet. This value reflects the voltage drop across the saturated transistor under moderate load, directly impacting conduction loss and thermal rise. For low-loss operation, ensure sufficient base drive to maintain deep saturation.

Can the 2N5771 be used in linear amplifier applications?

The 2N5771 is explicitly characterized and optimized for saturated switching-not linear amplification. Its h_fe bandwidth is limited to 8.5 MHz at 10 mA, and small-signal parameters like f_T are not specified. While it may function in Class-A configurations, distortion, gain instability, and thermal drift are likely. Use dedicated amplifiers like BC557 or SSM2212 for linear applications.

Does the 2N5771 have Pb-free or RoHS-compliant variants?

Fairchild's original 2N5771 documentation predates mandatory RoHS compliance (pre-2006), and no Pb-free version is referenced in the datasheet or packaging records. Modern equivalents like the NSS20101MR6T1 (SOT-23) or PBSS4240T (SOT-23) offer RoHS-compliant PNP alternatives with comparable speed and ratings. Confirm compliance status directly with ON Semiconductor for legacy Fairchild parts.

2N5771 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 15 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 10nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 10mA, 300mV

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

2N5771 FAQ

1.How can I place an order for 2N5771 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N5771 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 2N5771 reliable?

The price and inventory of 2N5771 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N5771 is usually 5 days.

3.What payment methods are accepted for 2N5771?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N5771 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N5771?

2N5771 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N5771 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 2N5771?

For technical support, including 2N5771 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N5771 requirements.

6.How does Aetrix verify that 2N5771 is sourced from the original manufacturer or authorized distributors?

All 2N5771 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 2N5771 meets industry standards.

7.What is the process for return or replacement of 2N5771?

All 2N5771 units undergo pre-shipment inspection (PSI). If there is an issue with 2N5771, 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 2N5771 part is unused and in its original packaging.

Return procedure for 2N5771:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…