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

onsemi MPS6531_D26Z

Name: MPS6531_D26Z
Brand: onsemi
SKU: MPS6531_D26Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPS6531_D26Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPS6531_D26Z.pdf

Description:: TRANS NPN 40V 1A TO-92-3

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Product details

Overview

MPS6531_D26Z from Fairchild Semiconductor is an NPN general-purpose amplifier transistor in TO-92 package, rated for 40 V V_CEO, 1.0 A continuous collector current, and 625 mW power dissipation at 25°C. It serves as a medium-power linear amplifier or switching device in discrete analog and digital interface circuits, supporting applications such as signal buffering, relay driving, and low-speed logic-level translation.

For engineers reviewing the MPS6531_D26Z datasheet, pinout, applications, or equivalent options, key selection criteria include its 40 V breakdown rating, 60–270 h_FE gain range across operating conditions, TO-92 mechanical compatibility, thermal resistance (R_θJA = 200 °C/W), and suitability for DC-coupled amplification or saturated switching at ≤500 mA load.

Technical Context

The MPS6531_D26Z implements a silicon planar epitaxial NPN structure optimized for stable DC current gain and low saturation voltage in general-purpose amplification and switching roles. Its design supports operation from –55°C to +150°C junction temperature, with verified V_CE(sat) ≤ 0.3 V at I_C = 100 mA / I_B = 10 mA and V_BE(sat) ≤ 1.0 V under the same conditions.

It shares process and parametric lineage with the PN2222A family but is specified for higher continuous collector current (1.0 A vs. 0.8 A) and identical 40 V V_CEO rating. The device exhibits 5.0 pF output capacitance at 10 V V_CB, enabling predictable small-signal behavior up to mid-frequency ranges without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown under open-base condition; defines upper rail limit in switch/amplifier designs.
I_C (continuous)	1.0 A - Sustained collector current capability; enables direct drive of moderate-power loads like solenoids or LED strings.
P_D	625 mW at 25°C - Total thermal power limit; derates 5.0 mW/°C above ambient, requiring heatsinking above ~75°C case temp.
h_FE	60–270 - DC current gain range across test points (10–500 mA); supports reliable biasing in Class-A amplifiers and robust saturation in switch mode.
V_CE(sat)	≤ 0.3 V at I_C = 100 mA, I_B = 10 mA - Low on-state voltage drop minimizes conduction loss and self-heating during switching.
R_θJA	200 °C/W - Junction-to-ambient thermal resistance in standard PCB mount; informs minimum copper area needed for thermal management.

Pinout & Package

Package: TO-92 - Molded plastic through-hole package with 3 leads, standardized footprint (0.500" lead pitch), and 0.1977 g unit weight. Compatible with wave soldering and manual prototyping.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Reference node for bias networks; connected to ground or low-side return path in common-emitter configurations.
Base (B)	Control input	Receives forward-biased current to modulate collector current; requires series resistor to limit I_B per h_FE and V_BE(sat).
Collector (C)	Current source terminal	Delivers amplified/saturated output current; connects to load and positive supply in typical switch layouts.

Key Features

Feature	Design Value
High-current capability	Rated for 1.0 A continuous collector current - supports direct drive of relays, small motors, and indicator arrays without external driver stages.
Low saturation voltage	V_CE(sat) ≤ 0.3 V at I_C/I_B = 10 - reduces power loss and improves efficiency in saturated-switch applications.
Wide operating temperature	–55°C to +150°C junction range - suitable for industrial control, automotive under-hood modules, and outdoor equipment.
Proven process reliability	Sourced from Fairchild Process 19 - mature bipolar fabrication with documented long-term stability and low parameter drift over time.

Applications

Relay Driver Circuit	DC Motor Speed Control
Use Scenario: Driving 12 V, 300 mA coil relays in PLC I/O modules with microcontroller GPIO outputs. IC Role / Device Role / Timing Role: NPN switch providing current gain and isolation between low-power logic and inductive load. Use Value: V_CE(sat) ≤ 0.3 V ensures <100 mW dissipation at full load, eliminating need for heatsink in compact enclosures.	Use Scenario: PWM-controlled speed regulation of 6–24 V brushed DC motors in portable tools and HVAC actuators. IC Role / Device Role / Timing Role: Low-frequency power switch handling up to 500 mA average current in unidirectional H-bridge half-legs. Use Value: 1.0 A I_C rating provides 2× safety margin over peak motor stall current, improving field reliability.
LED Current Amplifier	Signal Level Shifter
Use Scenario: Boosting microcontroller I/O current to drive high-brightness LED strings (e.g., status indicators, backlighting). IC Role / Device Role / Timing Role: Common-emitter amplifier configured for constant-current LED biasing. Use Value: h_FE ≥ 60 at 100 mA enables precise current setting with minimal base drive overhead.	Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage sensor interfaces and legacy bus adapters. IC Role / Device Role / Timing Role: Active pull-up/pull-down stage for bidirectional level conversion with fast turn-on/turn-off. Use Value: 5.0 pF Cob and 1.0 V V_BE(sat) support clean edge transitions up to 1 MHz without added gate drivers.

Relay Driver Circuit

DC Motor Speed Control

Use Scenario: Driving 12 V, 300 mA coil relays in PLC I/O modules with microcontroller GPIO outputs.

IC Role / Device Role / Timing Role: NPN switch providing current gain and isolation between low-power logic and inductive load.

Use Value: V_CE(sat) ≤ 0.3 V ensures <100 mW dissipation at full load, eliminating need for heatsink in compact enclosures.

Use Scenario: PWM-controlled speed regulation of 6–24 V brushed DC motors in portable tools and HVAC actuators.

IC Role / Device Role / Timing Role: Low-frequency power switch handling up to 500 mA average current in unidirectional H-bridge half-legs.

Use Value: 1.0 A I_C rating provides 2× safety margin over peak motor stall current, improving field reliability.

LED Current Amplifier

Signal Level Shifter

Use Scenario: Boosting microcontroller I/O current to drive high-brightness LED strings (e.g., status indicators, backlighting).

IC Role / Device Role / Timing Role: Common-emitter amplifier configured for constant-current LED biasing.

Use Value: h_FE ≥ 60 at 100 mA enables precise current setting with minimal base drive overhead.

Use Scenario: Translating 3.3 V logic signals to 5 V or 12 V domains in mixed-voltage sensor interfaces and legacy bus adapters.

IC Role / Device Role / Timing Role: Active pull-up/pull-down stage for bidirectional level conversion with fast turn-on/turn-off.

Use Value: 5.0 pF Cob and 1.0 V V_BE(sat) support clean edge transitions up to 1 MHz without added gate drivers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2222A	Lower I_C rating (0.8 A), identical V_CEO (40 V), slightly lower h_FE min (35 vs. 60 at 10 mA)	Same TO-92 pinout; suitable where peak current stays below 400 mA and thermal margin is adequate	Select PN2222A only if design operates well within 80% of MPS6531_D26Z's current rating and no derating headroom is required.
BC547B	Lower V_CEO (45 V), lower I_C (100 mA), higher h_FE (200–450), same TO-92 package	Not suitable for >200 mA loads; preferred in low-noise preamp stages rather than power switching	Choose BC547B only for signal amplification below 100 mA; avoid for relay/motor drive due to insufficient current headroom.

Compared with PN2222A and BC547B, the MPS6531_D26Z delivers superior current handling and thermal margin for medium-power switching, while maintaining TO-92 compatibility-making it optimal when designs demand ≥500 mA capability without upgrading to SOT-23 or DPAK packages.

Availability

MPS6531_D26Z is available at Aetrix Electronics and suitable for relay driver circuits, DC motor control modules, LED current amplifiers, and signal level shifter designs requiring stable component supply and long-lifecycle support.

Supply support for MPS6531_D26Z 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 semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016. Its legacy products remain widely deployed in industrial and consumer systems.

The MPS6531_D26Z belongs to Fairchild's general-purpose bipolar transistor product line, engineered for cost-effective, robust amplification and switching in non-critical analog and digital interface applications.

FAQ

What is the maximum collector-emitter voltage rating for the MPS6531_D26Z?

The MPS6531_D26Z has a V_CEO rating of 40 V, meaning it can safely withstand up to 40 volts between collector and emitter with the base open. This rating is validated per JEDEC test conditions (I_C = 10 mA, I_B = 0) and must not be exceeded to prevent avalanche breakdown. Derating is recommended for operation above 25°C ambient or under pulsed conditions.

Does the MPS6531_D26Z have the same pinout as the PN2222A?

Yes, the MPS6531_D26Z uses the standard TO-92 package with E-B-C pin order (Emitter–Base–Collector, left-to-right when flat side faces viewer and leads point downward). This matches the PN2222A pinout exactly, enabling direct physical replacement in existing PCB layouts-provided thermal and current requirements remain within PN2222A's lower 0.8 A I_C limit.

What is the typical DC current gain (h_FE) of the MPS6531_D26Z at 100 mA collector current?

At V_CE = 1.0 V and I_C = 100 mA, the MPS6531_D26Z exhibits h_FE between 90 and 270, per Fairchild's published electrical characteristics. This wide range reflects process variation and confirms suitability for designs that accommodate gain spread via conservative base-resistor sizing or feedback stabilization.

Can the MPS6531_D26Z be used in switching applications with 500 mA load current?

Yes, the MPS6531_D26Z is explicitly rated for 500 mA collector current in switching mode, with V_CE(sat) ≤ 0.3 V confirmed at I_C = 100 mA / I_B = 10 mA. At 500 mA, saturation performance remains usable with appropriate base drive (e.g., I_B ≥ 25 mA), though thermal design must account for increased power dissipation and R_θJA-limited junction temperature rise.

Is the MPS6531_D26Z RoHS compliant and halogen-free?

Yes, the MPS6531_D26Z manufactured under Fairchild's post-2006 production standards meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Compliance is verified through material declarations and lot-specific test reports; full documentation is available upon request for Aetrix Electronics customers.

MPS6531_D26Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 90 @ 100mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

MPS6531_D26Z FAQ

1.How can I place an order for MPS6531_D26Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS6531_D26Z 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 MPS6531_D26Z reliable?

The price and inventory of MPS6531_D26Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS6531_D26Z is usually 5 days.

3.What payment methods are accepted for MPS6531_D26Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS6531_D26Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS6531_D26Z?

MPS6531_D26Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS6531_D26Z 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 MPS6531_D26Z?

For technical support, including MPS6531_D26Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS6531_D26Z requirements.

6.How does Aetrix verify that MPS6531_D26Z is sourced from the original manufacturer or authorized distributors?

All MPS6531_D26Z 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 MPS6531_D26Z meets industry standards.

7.What is the process for return or replacement of MPS6531_D26Z?

All MPS6531_D26Z units undergo pre-shipment inspection (PSI). If there is an issue with MPS6531_D26Z, 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 MPS6531_D26Z part is unused and in its original packaging.

Return procedure for MPS6531_D26Z:

1.Submit a request within 90 days.

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

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