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

Nexperia USA Inc. BSR31-QF

Name: BSR31-QF
Brand: Nexperia USA Inc.
SKU: BSR31-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSR31-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BSR31-QF.pdf

Description:: TRANS PNP 60V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:6,588

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Product details

Overview

BSR31-QF from Nexperia is a PNP medium power transistor in SOT89 package, rated for −60 V V_CEO, −1 A continuous collector current, and 1.35 W power dissipation at T_amb ≤ 25 °C, with AEC-Q101 qualification for automotive linear voltage regulators and high-side switches.

For engineers reviewing the BSR31-QF datasheet, BSR31-QF pinout, BSR31-QF application, or BSR31-QF equivalent, this device serves as a thermally robust, automotive-qualified PNP switch with exposed heatsink pad, DC current gain (h_FE) of 100–300 at −100 mA, and low V_CE(sat) down to −0.25 V.

Technical Context

This PNP bipolar junction transistor operates in linear and switching modes with verified thermal performance: R_th(j-sp) = 13 K/W to solder point and R_th(j-a) = 93 K/W in free air on FR4 PCB. Its exposed collector pad enables direct thermal conduction and low-impedance electrical connection to ground or heatsink planes.

It delivers stable h_FE across −100 µA to −500 mA collector currents and supports pulsed operation up to 2 A peak (t_p ≤ 1 ms), with V_BE(sat) ≤ −1.2 V at −50 mA base drive - enabling efficient gate driving of N-channel MOSFETs in high-side configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−60 V: Maximum safe collector-emitter voltage with base open; defines breakdown margin in high-side switch or regulator applications.
I_C	−1 A continuous: Rated DC collector current under specified thermal conditions; supports sustained load switching in battery-driven devices.
P_tot	1.35 W at T_amb ≤ 25 °C: Total power dissipation limit on FR4 PCB with 6 cm² collector pad; determines thermal derating curve in real layouts.
h_FE	100–300 at V_CE = −5 V, I_C = −100 mA: DC current gain range confirming predictable base drive requirements for linear or saturated operation.
V_CE(sat)	−0.25 V min at I_C = −150 mA, I_B = −15 mA: Low saturation voltage reduces conduction loss and self-heating in switching applications.
f_T	100 MHz at V_CE = −10 V, I_C = −50 mA: Transition frequency indicating usable bandwidth for amplifier or fast-switching driver roles.

Pinout & Package

SOT89 plastic surface-mount package (4.5 mm × 2.5 mm × 1.5 mm body) with exposed collector pad for thermal and electrical integration; 1.5 mm lead pitch; 3-terminal configuration.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to load return or supply rail in high-side switch topology.
2	Collector	Main current input terminal; electrically and thermally tied to exposed metal pad for PCB heat sinking.
3	Base	Control input; requires negative bias relative to emitter to turn on PNP device; low-impedance drive needed for fast switching.

Key Features

Feature	Design Value
Exposed collector pad	Enables direct thermal coupling to PCB copper area (6 cm² recommended), reducing R_th(j-a) by >75% vs. standard SMT packages.
AEC-Q101 qualification	Validated for automotive use per stress test standard, including temperature cycling, HTRB, and ESD testing - supports Tier-1 BOM inclusion.
High power dissipation	1.35 W rating at 25 °C ambient allows operation at higher current levels than comparable SOT23 or SOT223 transistors in same footprint class.
Complementary NPN pair	BSR41-Q shares identical SOT89 package and matching specs (60 V, 1 A), simplifying dual-rail or push-pull circuit layout and sourcing.

Applications

Linear Voltage Regulators

High-Side Switches

Use Scenario: Adjustable LDO pre-regulator stage supplying microcontroller rails in automotive body control modules.

IC Role / Device Role / Timing Role: Pass transistor controlling output voltage via feedback loop; handles up to 1 A load with minimal dropout.

Use Value: Low V_CE(sat) and high h_FE reduce base drive loss and improve regulation accuracy under varying load conditions.

Use Scenario: Power enable switch for infotainment system peripherals powered from 12 V battery rail.

IC Role / Device Role / Timing Role: High-side PNP switch controlled by MCU GPIO through level-shifting resistor network.

Use Value: Exposed collector pad ensures reliable thermal management during sustained 1 A loads, avoiding thermal shutdown in sealed enclosures.

Battery-Driven Devices

MOSFET Drivers

Use Scenario: Load disconnect switch in portable medical equipment using Li-ion battery pack (up to 16.8 V).

IC Role / Device Role / Timing Role: Reverse-polarity protection and ON/OFF control element placed between battery and main DC/DC converter.

Use Value: −60 V V_CEO provides 3.7× safety margin over max battery voltage, supporting long-term reliability in field deployments.

Use Scenario: Level-shifting driver stage for N-channel high-side MOSFET in BLDC motor gate driver IC reference design.

IC Role / Device Role / Timing Role: Fast-turn-on PNP current source pulling gate low during dead-time; complements NPN pull-up stage.

Use Value: f_T = 100 MHz and low V_BE(sat) ensure sub-100 ns switching transitions, minimizing shoot-through risk in half-bridge topologies.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC807-40,215 (Nexperia)	SOT23 package; lower P_tot (0.3 W); h_FE = 250–600 but I_C = −0.5 A max.	Not suitable for ≥1 A continuous loads or high-power thermal environments.	Select when board space is constrained and load current remains below 500 mA.
MJD2955G (ON Semiconductor)	TO-220 package; higher P_tot (115 W with heatsink); V_CEO = −60 V; I_C = −10 A.	Requires mechanical mounting and heatsink; incompatible with SMT-only assembly.	Select only when >1 A peak current or forced-air cooling is required; not drop-in replaceable.

Compared with BC807-40,215 and MJD2955G, BSR31-QF uniquely balances SMT manufacturability, 1 A capability, and automotive qualification in a thermally enhanced SOT89 - making it optimal for space-constrained, high-reliability 12 V/24 V automotive subsystems.

Availability

BSR31-QF is available at Aetrix Electronics and suitable for linear voltage regulators, high-side switches, and battery-driven devices requiring stable component supply and AEC-Q101 compliance.

Supply support for BSR31-QF 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

BSR31-QF belongs to Nexperia's AEC-Q101-qualified medium-power bipolar transistor family, engineered specifically for thermally demanding automotive power control functions where SMT integration and reliability are critical.

FAQ

Is BSR31-QF pin-compatible with BSR41-Q?

No - BSR31-QF is PNP and BSR41-Q is NPN, so their pin assignments are functionally mirrored but not electrically interchangeable. Both share identical SOT89 pinout (Emitter–Collector–Base), but polarity reversal means direct substitution would invert circuit behavior and likely cause failure.

What is the maximum allowable PCB copper area for optimal thermal performance?

The datasheet specifies a 6 cm² single-sided tin-plated copper pad under the exposed collector for R_th(j-a) = 93 K/W. Increasing pad area beyond 6 cm² yields diminishing returns; doubling it reduces R_th(j-a) by only ~10%, while multilayer thermal vias provide more effective improvement.

Can BSR31-QF be used in avalanche mode?

No - the datasheet does not specify or characterize avalanche energy rating (E_AS). Its absolute maximum V_CEO is −60 V with base open, and operation beyond that risks irreversible breakdown. It is not designed or tested for repetitive avalanche switching.

Does the marking code 'BR2' correspond exclusively to BSR31-QF?

Yes - per Table 4 of the datasheet, 'BR2' is the unique top-side laser marking for BSR31-QF. No other Nexperia device uses this code, and it appears only on SOT89-packaged units meeting the full BSR31-QF specification, including AEC-Q101 qualification.

BSR31-QF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1 A

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

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

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 5V

Power - Max:: 1.35 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BSR31-QF FAQ

1.How can I place an order for BSR31-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for BSR31-QF 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 BSR31-QF reliable?

The price and inventory of BSR31-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR31-QF is usually 5 days.

3.What payment methods are accepted for BSR31-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR31-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSR31-QF?

BSR31-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSR31-QF 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 BSR31-QF?

For technical support, including BSR31-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR31-QF requirements.

6.How does Aetrix verify that BSR31-QF is sourced from the original manufacturer or authorized distributors?

All BSR31-QF 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 BSR31-QF meets industry standards.

7.What is the process for return or replacement of BSR31-QF?

All BSR31-QF units undergo pre-shipment inspection (PSI). If there is an issue with BSR31-QF, 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 BSR31-QF part is unused and in its original packaging.

Return procedure for BSR31-QF:

1.Submit a request within 90 days.

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

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