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

STMicroelectronics BD140-16

Name: BD140-16
Brand: STMicroelectronics
SKU: BD140-16
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BD140-16

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: BD140-16.pdf

Description:: TRANS PNP 80V 1.5A SOT-32

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,842

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

Product details

Overview

BD140-16 from STMicroelectronics is a complementary PNP bipolar junction transistor in SOT-32 (TO-126) package, rated for -80 V V_CBO, -80 V V_CEO, -1.5 A I_C, and 12.5 W P_TOT at T_C ≤ 25 °C, with h_FE group 160–250 at I_C = -150 mA, used in quasi-complementary audio amplifier output stages.

For engineers reviewing the BD140-16 datasheet, BD140-16 pinout, BD140-16 application, or BD140-16 equivalent, key selection criteria include guaranteed h_FE binning (160–250), safe operating area under pulsed conditions, thermal resistance (R_thj-case = 10 °C/W), and compatibility with BD139-16 in push-pull configurations.

Technical Context

This PNP BJT operates in linear amplification mode with fixed-base biasing or emitter-follower configuration, supporting DC-coupled and transformer-coupled Class AB audio output stages. Its V_CEO(sus) = -80 V and I_CM = -3 A enable robust handling of reactive speaker loads and transient overcurrents.

The device uses epitaxial planar technology with defined h_FE grouping (BD140-16 = 160–250), ensuring predictable current gain matching when paired with BD139-16 (NPN, same h_FE range), critical for low-distortion quasi-complementary symmetry in discrete power amplifiers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-80 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe rail voltage headroom in amplifier supply design.
I_C	-1.5 A - Continuous DC collector current rating; sets maximum quiescent output stage bias and average power delivery capability.
P_TOT (T_C ≤ 25 °C)	12.5 W - Total power dissipation at case temperature ≤ 25 °C; determines heatsink sizing for linear operation.
h_FE (I_C = -150 mA)	160–250 - Guaranteed DC current gain range for BD140-16 bin; enables matched NPN/PNP pair selection with BD139-16.
R_thj-case	10 °C/W - Junction-to-case thermal resistance; directly impacts thermal rise under load and heatsink interface requirements.
V_CE(sat)	-0.5 V @ I_C = -0.5 A, I_B = -0.05 A - Saturation voltage defining conduction loss and minimum output swing in switching or saturated-region use.

Pinout & Package

SOT-32 (TO-126) plastic package with integral mounting tab electrically connected to collector; standardized 3-pin through-hole layout optimized for PCB heat transfer and mechanical stability in power amplifier modules.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to negative rail or load return; polarity defines PNP current flow direction in circuit topology.
2 (Base)	Control input	Receives forward-biased drive current to regulate collector current; requires external current-limiting resistor in most applications.
3 (Collector / Tab)	Main current path & thermal interface	Electrically tied to metal mounting tab; must be isolated from chassis unless common-collector configuration is intended.

Key Features

Feature	Design Value
Pre-selected h_FE binning (160–250)	Ensures consistent current gain matching with BD139-16 for symmetric quasi-complementary amplifier stages.
V_CEO(sus) = -80 V (pulsed)	Supports reliable operation under reactive speaker load transients without secondary breakdown.
R_thj-case = 10 °C/W	Enables efficient heat transfer to external heatsink, reducing thermal derating in compact audio chassis designs.
ECOPACK® lead-free construction	Meets RoHS compliance requirements without compromising solderability or thermal performance in reflow or wave processes.

Applications

Audio Power Amplifier Output Stage

DC Motor Driver (Low-Power)

Use Scenario: Discrete Class AB push-pull output stage in 10–20 W hi-fi amplifier using BD139-16/BD140-16 complementary pair.

IC Role / Device Role / Timing Role: PNP power transistor delivering negative half-cycle current to loudspeaker load.

Use Value: Matched h_FE binning minimizes crossover distortion; -80 V rating accommodates ±35 V rails with margin.

Use Scenario: H-bridge half-bridge leg driving 12 V, 1 A brushed DC motor in industrial actuator control.

IC Role / Device Role / Timing Role: High-side PNP switch controlling motor voltage polarity during direction reversal.

Use Value: -1.5 A I_C and -0.5 V V_CE(sat) limit conduction loss to <1 W at full load, reducing thermal stress.

Regulated Linear Power Supply Pass Element

LED Constant-Current Driver

Use Scenario: Series pass transistor in adjustable 0–30 V, 1.2 A bench power supply with foldback current limiting.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output against load and line variations.

Use Value: 12.5 W P_TOT and 10 °C/W R_thj-case allow stable operation up to 75 °C ambient with minimal heatsink.

Use Scenario: Constant-current sink for high-brightness white LED string (3–4 LEDs, 350 mA) in signage illumination.

IC Role / Device Role / Timing Role: Precision current-regulating element controlled by op-amp feedback loop.

Use Value: Tight h_FE range ensures predictable base drive requirements across production units, simplifying feedback compensation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD140-10	h_FE = 100–160 (lower mid-range gain bin); identical voltage/current ratings and package.	Less suitable for high-fidelity audio where tight NPN/PNP gain symmetry is required with BD139-10.	Select only when lower gain consistency is acceptable and cost sensitivity outweighs matching precision.
MJD127	TO-252 (DPAK) surface-mount package; same -80 V/-1.5 A ratings but higher R_thj-amb (62.5 °C/W vs. 100 °C/W for BD140-16).	Designed for automated assembly; lacks mounting tab for direct heatsinking, requiring thermal pad or copper pour.	Choose for space-constrained PCBs where reflow compatibility and footprint density are prioritized over manual heatsink attachment.

Compared with BD140-10, the BD140-16 offers superior h_FE matching for audio symmetry; versus MJD127, it provides better thermal interface via TO-126 tab but requires through-hole assembly and larger board area.

Availability

BD140-16 is available at Aetrix Electronics and suitable for audio power amplifiers, linear power supplies, and DC motor drivers requiring stable component supply with verified h_FE binning and thermal reliability.

Supply support for BD140-16 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, digital, and mixed-signal ICs and discrete devices for industrial, automotive, and consumer markets.

The BD140 series belongs to ST's legacy power bipolar transistor product line, engineered specifically for cost-sensitive, medium-power linear amplification and switching applications demanding reliability and consistent parametric binning.

FAQ

Is BD140-16 pin-compatible with BD140?

Yes, BD140-16 shares identical SOT-32 (TO-126) pinout and mechanical footprint with BD140. The "-16" suffix denotes h_FE binning (160–250), not a physical or electrical revision-electrical ratings, thermal data, and pin functions are fully identical.

Can BD140-16 replace BD136-16 in an existing design?

No-BD140-16 has -80 V V_CEO and -1.5 A I_C, while BD136-16 is rated for -45 V V_CEO and same -1.5 A I_C. Substituting BD140-16 may cause overstress in circuits designed for BD136-16's lower voltage rating unless rail voltages are confirmed ≤45 V.

What is the maximum continuous power dissipation at 70 °C case temperature?

Using linear derating: P_TOT(70 °C) = 12.5 W − [(70 − 25) °C × (12.5 W / 75 °C)] = 9.375 W. This assumes 10 °C/W R_thj-case and no ambient contribution-actual usable power depends on heatsink efficiency and airflow.

Does BD140-16 require a heatsink in a 5 W audio amplifier output stage?

Yes-even at 5 W dissipation, junction temperature rise would exceed safe limits without heatsinking: ΔT = 5 W × 10 °C/W = 50 °C. With 25 °C ambient, T_j = 75 °C, well below 150 °C max, but long-term reliability and thermal cycling demand at least a small extruded aluminum heatsink per JEDEC guidelines.

BD140-16 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 2V, 150MA

Power - Max:: 1.25 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-32

BD140-16 FAQ

1.How can I place an order for BD140-16 through Aetrix?

Please submit a Request for Quotation (RFQ) for BD140-16 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 BD140-16 reliable?

The price and inventory of BD140-16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD140-16 is usually 5 days.

3.What payment methods are accepted for BD140-16?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD140-16 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD140-16?

BD140-16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD140-16 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 BD140-16?

For technical support, including BD140-16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD140-16 requirements.

6.How does Aetrix verify that BD140-16 is sourced from the original manufacturer or authorized distributors?

All BD140-16 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 BD140-16 meets industry standards.

7.What is the process for return or replacement of BD140-16?

All BD140-16 units undergo pre-shipment inspection (PSI). If there is an issue with BD140-16, 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 BD140-16 part is unused and in its original packaging.

Return procedure for BD140-16:

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…