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

Nexperia USA Inc. BSR31,135

Name: BSR31,135
Brand: Nexperia USA Inc.
SKU: BSR31,135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSR31,135

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BSR31,135.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSR31,135 from Nexperia is a PNP medium-power bipolar junction 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. It serves as a high-side switch or linear regulator pass element in battery-powered systems and MOSFET gate drivers.

For engineers reviewing the BSR31,135 datasheet, BSR31,135 pinout, BSR31,135 application, or BSR31,135 equivalent, key selection criteria include its exposed heatsink thermal path (R_th(j-sp) = 13 K/W), DC current gain range (h_FE = 100–300 at −100 mA), and −0.25 V V_CE(sat) at −150 mA/−15 mA drive.

Technical Context

This PNP transistor operates in linear and switching modes with verified saturation performance under pulsed conditions (t_p ≤ 300 µs, duty δ ≤ 0.01). Its design supports stable biasing in high-side configurations where emitter is tied to supply rail and collector delivers load current to ground.

Thermal management relies on the SOT89's exposed collector pad soldered to ≥6 cm² copper area on FR4 PCB, enabling R_th(j-a) = 93 K/W in free air and R_th(j-sp) = 13 K/W to solder point - critical for sustained 1 A operation without forced cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−60 V: Maximum safe collector-emitter voltage with base open; defines upper limit for high-side switch blocking capability.
I_C	−1 A continuous: Rated DC collector current; supports loads up to ~1 A in linear regulators or driver stages.
P_tot	1.35 W at T_amb ≤ 25 °C: Total power dissipation limit; requires ≥6 cm² copper pad for full rating.
h_FE	100–300 at V_CE = −5 V, I_C = −100 mA: DC current gain range; enables predictable base drive sizing for switching or amplification.
V_CE(sat)	−0.25 V at I_C = −150 mA, I_B = −15 mA: Low saturation voltage reduces conduction loss in switching applications.
f_T	100 MHz at V_CE = −10 V, I_C = −50 mA: Transition frequency; supports moderate-speed switching (e.g., <10 MHz PWM).

Pinout & Package

SOT89 plastic surface-mount package with 3 leads, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body, and exposed collector pad for thermal and electrical connection.

Pin/Terminal	Circuit Role	Design Meaning
1	E (Emitter)	PNP emitter terminal; connected to positive supply rail in high-side switch configuration.
2	C (Collector)	PNP collector terminal; output node delivering current to load; electrically and thermally tied to exposed pad.
3	B (Base)	Control input; negative current injection turns device ON; requires current-limiting resistor in most designs.

Key Features

Feature	Design Value
Exposed collector pad	Enables direct thermal coupling to PCB copper; achieves R_th(j-sp) = 13 K/W for reliable 1 A operation.
High power dissipation	1.35 W rating at 25 °C ambient with proper layout - exceeds typical SOT23/SOT323 limits by >3×.
High DC current gain	h_FE ≥ 100 at −100 mA ensures low base drive current demand in linear and switching use cases.
Low V_CE(sat)	−0.25 V at −150 mA/−15 mA reduces conduction loss and self-heating in high-side switch applications.

Applications

Linear Voltage Regulators

High-Side Switches

Use Scenario: Adjustable or fixed-output linear regulators delivering up to 1 A to microcontrollers or sensors in portable equipment.

IC Role / Device Role / Timing Role: Pass transistor controlling output voltage via emitter-follower configuration with feedback loop.

Use Value: Low V_CE(sat) minimizes dropout voltage; high h_FE simplifies base drive design and improves load regulation.

Use Scenario: Power control of peripheral modules (e.g., displays, sensors) in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: High-side switch connecting V_BAT to load; controlled by MCU GPIO through base resistor.

Use Value: −60 V V_CEO supports 24 V industrial batteries; exposed pad maintains junction temperature below 150 °C at full load.

Battery-Driven Devices

MOSFET Drivers

Use Scenario: Load switching and reverse-polarity protection circuits in handheld medical or test equipment.

IC Role / Device Role / Timing Role: Main power path switch or series protection element between battery and system rails.

Use Value: −1 A continuous rating handles peak loads; −70 V V_CBO provides margin against transients during hot-swap events.

Use Scenario: Level-shifting and current-boosting stage driving N-channel MOSFET gates in half-bridge motor controllers.

IC Role / Device Role / Timing Role: PNP current source/sink amplifier translating logic-level signals to higher-current gate drive.

Use Value: 100 MHz f_T supports fast gate charging; low V_CE(sat) preserves drive voltage headroom at high frequencies.

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
BSR41,135	NPN complement; same SOT89 package, +60 V V_CEO, +1 A I_C, but opposite polarity and biasing requirements.	Used in low-side switching or NPN-based regulator topologies; not interchangeable without circuit redesign.	Select when NPN topology is preferred or complementary pairing is needed in push-pull stages.
ZTX788B	Higher V_CEO (−80 V), lower h_FE (min 60), TO-92 package; no exposed thermal pad.	Limited to lower-current or less thermally demanding applications due to higher R_th(j-a) (~200 K/W).	Choose only if board space allows TO-92 and thermal budget permits reduced power handling.

Compared with BSR41,135 and ZTX788B, the BSR31,135 uniquely combines PNP polarity, SOT89 thermal performance, and −60 V/−1 A ratings - making it optimal for compact, thermally constrained high-side switches and linear regulators where polarity and package thermal efficiency are decisive.

Availability

BSR31,135 is available at Aetrix Electronics and suitable for linear voltage regulators, high-side switches, and MOSFET drivers requiring stable component supply in industrial, medical, and portable electronics programs.

Supply support for BSR31,135 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 specializing in high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands.

The BSR31,135 belongs to Nexperia's medium-power bipolar transistor product line, engineered for robust performance in power management and interface circuits where thermal efficiency and DC gain stability are essential.

FAQ

What is the maximum allowable junction temperature for BSR31,135?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent degradation. Derating is required above 25 °C ambient - for example, at 70 °C ambient, maximum usable power drops to ~0.8 W with standard PCB layout.

Can BSR31,135 be used in automotive applications?

No. The BSR31,135 is explicitly marked as non-automotive qualified in the revision history. It lacks AEC-Q101 qualification and has not undergone automotive-grade stress testing. For automotive use, Nexperia offers Q-qualified variants such as BSR31-Q.

How does the exposed collector pad affect PCB layout?

The exposed collector pad must be soldered to a minimum 6 cm² copper area on the top layer of an FR4 PCB, tin-plated and single-sided, to achieve the rated 1.35 W power dissipation. Smaller pads increase R_th(j-a) and reduce safe operating current - e.g., halving pad area raises thermal resistance by ~30 %.

Is BSR31,135 pin-compatible with other SOT89 transistors?

Yes, the BSR31,135 follows standard SOT89 pinning: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. This matches industry-standard SOT89 layouts including those of MMBT3906, PMST2907A, and ZTX751 - though electrical parameters differ significantly.

BSR31,135 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:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BSR31,135 FAQ

1.How can I place an order for BSR31,135 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSR31,135 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 BSR31,135 reliable?

The price and inventory of BSR31,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR31,135 is usually 5 days.

3.What payment methods are accepted for BSR31,135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR31,135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSR31,135?

BSR31,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSR31,135 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 BSR31,135?

For technical support, including BSR31,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR31,135 requirements.

6.How does Aetrix verify that BSR31,135 is sourced from the original manufacturer or authorized distributors?

All BSR31,135 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 BSR31,135 meets industry standards.

7.What is the process for return or replacement of BSR31,135?

All BSR31,135 units undergo pre-shipment inspection (PSI). If there is an issue with BSR31,135, 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 BSR31,135 part is unused and in its original packaging.

Return procedure for BSR31,135:

1.Submit a request within 90 days.

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

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