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 MPS6651

Name: MPS6651
Brand: onsemi
SKU: MPS6651
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MPS6651

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: MPS6651.pdf

Description:: TRANS PNP 25V 1A TO92

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,533

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

Product details

Overview

MPS6651 from onsemi is a general-purpose PNP bipolar junction transistor in TO-92 package, rated for V_CEO = 25 V, I_C = 1000 mA continuous, and P_D = 625 mW at T_A = 25°C. It delivers h_FE ≥ 50 at I_C = 100 mA / V_CE = −1.0 V and exhibits V_CE(sat) ≤ 0.6 V at I_C = 1000 mA / I_B = 100 mA, supporting medium-power linear amplification and switching in discrete power stages.

For engineers reviewing the MPS6651 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating data, TO-92 terminal mapping, real-world use cases in voltage regulation and signal inversion, and two validated alternative PNP transistors with documented parameter trade-offs.

Technical Context

The MPS6651 operates as a silicon PNP BJT with negative-polarity voltage and current ratings per onsemi convention. Its DC current gain (h_FE) is specified across three collector current levels (100/500/1000 mA), and its f_T = 100 MHz enables RF-capable switching up to ~30 MHz under typical bias conditions.

Thermal design is constrained by R_JA = 200°C/W (PCB-mounted) and R_JC = 83.3°C/W, with safe operating area (SOA) curves defined for pulse durations from 1 ms to 1 s. Switching performance includes t_d ≤ 25 ns, t_r ≤ 30 ns, t_s ≤ 250 ns, and t_f ≤ 50 ns under V_CC = −40 V, I_C = 500 mA, and I_B1 = I_B2.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum reverse-biased collector-emitter voltage before breakdown; sets upper limit for supply rail in PNP switch/saturation applications.
I_C (cont.)	1000 mA - Continuous collector current rating; defines maximum DC load drive capability without forced cooling.
h_FE	≥50 @ I_C = 100 mA, V_CE = −1.0 V - Minimum DC current gain; determines required base drive for reliable saturation in switching designs.
V_CE(sat)	≤0.6 V @ I_C = 1000 mA, I_B = 100 mA - Saturation voltage drop; directly impacts conduction loss and heat generation in high-current switches.
f_T	100 MHz - Current-gain bandwidth product; supports stable small-signal amplification up to ~30 MHz and fast digital switching.
R_JA	200°C/W - Junction-to-ambient thermal resistance on standard PCB; used to calculate max ambient temperature for given power dissipation.
t_s	≤250 ns - Storage time during turn-off; critical for minimizing switching losses in PWM and high-frequency inverters.

Pinout & Package

Package: TO-92 (Case 29-11, Style 1), through-hole, epoxy-molded plastic with 3 leads. Standard lead spacing (P = 2.54 mm), body dimensions 4.45 × 5.20 × 3.18 mm (L × W × H). Pb-free variants available (MPS6651G).

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current source terminal for PNP operation; connected to most positive rail in common-emitter configurations.
2	Base	Control input; negative-going current injection turns device ON; requires current-limiting resistor in series.
3	Collector	Current sink terminal; tied to load and ground-side return path in typical switching topologies.

Key Features

Feature	Design Value
PNP polarity with negative voltage/current ratings	Enables complementary use with NPN devices like MPS6601 in push-pull output stages and differential pairs.
1000 mA continuous collector current	Supports direct drive of relays, LEDs, and small solenoids without external driver stages.
V_CE(sat) ≤ 0.6 V at full rated current	Reduces conduction loss to < 600 mW at 1 A, easing thermal management in compact layouts.
f_T = 100 MHz	Permits stable small-signal amplification up to VHF band and clean square-wave switching at >1 MHz.
TO-92 package with Pb-free options	Ensures compatibility with RoHS-compliant assembly processes and legacy through-hole manufacturing lines.

Applications

DC Voltage Regulator	Signal Level Shifter
Use Scenario: Discrete linear regulator stage delivering fixed −5 V from −12 V input with adjustable emitter-follower output. IC Role / Device Role / Timing Role: PNP pass transistor controlling output voltage via base bias network; operates in active region for regulation. Use Value: Leverages V_CEO = 25 V margin and h_FE ≥ 50 to maintain regulation accuracy across 10–500 mA loads with minimal dropout.	Use Scenario: Bidirectional logic-level translation between −3.3 V microcontroller I/O and −5 V peripheral bus. IC Role / Device Role / Timing Role: PNP switch configured as active-low level shifter; base driven by MCU, emitter tied to −5 V rail. Use Value: Uses V_BE(on) ≤ 1.2 V and fast t_f ≤ 50 ns to ensure sub-100 ns transition times and noise-immune interface timing.
Relay Driver	Audio Preamp Stage
Use Scenario: Driving 12 V, 80 mA coil relay from microcontroller GPIO with flyback protection. IC Role / Device Role / Timing Role: Saturated PNP switch sinking relay current through collector to ground; base biased via 1 kΩ resistor. Use Value: Delivers I_C = 1000 mA headroom and V_CE(sat) ≤ 0.6 V to guarantee >95% coil voltage delivery and low self-heating.	Use Scenario: First-stage low-noise preamplifier for electret microphone with −9 V supply. IC Role / Device Role / Timing Role: Common-emitter amplifier biased at I_C = 100 mA, V_CE = −5 V for optimal f_T and NF performance. Use Value: Achieves usable gain-bandwidth product (f_T = 100 MHz) and low noise figure (< 6 dB @ 1 kHz) per Figure 12 in datasheet.

DC Voltage Regulator

Signal Level Shifter

Use Scenario: Discrete linear regulator stage delivering fixed −5 V from −12 V input with adjustable emitter-follower output.

IC Role / Device Role / Timing Role: PNP pass transistor controlling output voltage via base bias network; operates in active region for regulation.

Use Value: Leverages V_CEO = 25 V margin and h_FE ≥ 50 to maintain regulation accuracy across 10–500 mA loads with minimal dropout.

Use Scenario: Bidirectional logic-level translation between −3.3 V microcontroller I/O and −5 V peripheral bus.

IC Role / Device Role / Timing Role: PNP switch configured as active-low level shifter; base driven by MCU, emitter tied to −5 V rail.

Use Value: Uses V_BE(on) ≤ 1.2 V and fast t_f ≤ 50 ns to ensure sub-100 ns transition times and noise-immune interface timing.

Relay Driver

Audio Preamp Stage

Use Scenario: Driving 12 V, 80 mA coil relay from microcontroller GPIO with flyback protection.

IC Role / Device Role / Timing Role: Saturated PNP switch sinking relay current through collector to ground; base biased via 1 kΩ resistor.

Use Value: Delivers I_C = 1000 mA headroom and V_CE(sat) ≤ 0.6 V to guarantee >95% coil voltage delivery and low self-heating.

Use Scenario: First-stage low-noise preamplifier for electret microphone with −9 V supply.

IC Role / Device Role / Timing Role: Common-emitter amplifier biased at I_C = 100 mA, V_CE = −5 V for optimal f_T and NF performance.

Use Value: Achieves usable gain-bandwidth product (f_T = 100 MHz) and low noise figure (< 6 dB @ 1 kHz) per Figure 12 in datasheet.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPS6652	V_CEO = 40 V, V_CBO = 30 V, same TO-92 package and pinout	Higher voltage headroom for −24 V or −48 V systems; identical thermal and switching specs	Select when operating above 25 V collector-emitter stress or requiring extended SOA at higher voltages.
BC557	V_CEO = 45 V, I_C = 100 mA, h_FE = 110–800 (min/max), TO-92	Lower current rating but higher gain range; not suitable for >100 mA loads	Choose only for low-current signal switching or amplification where gain consistency matters more than power handling.

Compared with MPS6651, MPS6652 offers higher voltage tolerance without sacrificing current or thermal capability, while BC557 trades off 90% of collector current capacity for wider h_FE spread-making MPS6651 optimal for medium-power PNP switching where both 25 V rating and 1 A drive are simultaneously required.

Availability

MPS6651 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and consumer appliance power supplies requiring stable component supply and long-term obsolescence support.

Supply support for MPS6651 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MPS66xx family was designed as cost-optimized, general-purpose bipolar transistors targeting discrete power switching, linear regulation, and analog signal conditioning in space-constrained through-hole applications.

FAQ

What is the maximum collector-emitter voltage rating for MPS6651?

The MPS6651 has a guaranteed minimum V_CEO rating of 25 Vdc at I_C = 1.0 mA and I_B = 0, per the Absolute Maximum Ratings table in the official onsemi datasheet (Rev. 4, June 2006). This rating applies strictly to DC or low-frequency operation and must be derated for pulsed or elevated-temperature conditions using the SOA curves on page 6.

Is MPS6651 pin-compatible with MPS6652?

Yes, MPS6651 and MPS6652 share identical TO-92 (Case 29-11) packaging and pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. Both devices are electrically interchangeable in circuits where 25 V V_CEO suffices; MPS6652 provides higher voltage margin (40 V) but otherwise matches MPS6651's thermal, switching, and gain characteristics.

What is the typical DC current gain (hFE) of MPS6651 at 500 mA collector current?

At I_C = 500 mA and V_CE = −1.0 V, the MPS6651 exhibits h_FE ≥ 50 per the Electrical Characteristics table. Figure 4 in the datasheet confirms this minimum holds across −50 mA to −1000 mA collector current range at T_J = 25°C, making it suitable for medium-current saturated switching where predictable base drive is required.

Can MPS6651 be used in audio amplifier circuits?

Yes, MPS6651 is suitable for low-to-medium power audio preamplifier and driver stages. Its f_T = 100 MHz, low noise figure (< 6 dB at 1 kHz, Figure 12), and linear h_FE response (Figure 4) support clean signal amplification up to several hundred kHz. Biasing at I_C = 100 mA and V_CE = −5 V optimizes gain and distortion performance per datasheet characterization.

Does MPS6651 have Pb-free packaging options?

Yes, MPS6651G is the Pb-free variant of MPS6651, fully compliant with RoHS Directive 2011/65/EU. Both MPS6651 and MPS6651G use identical TO-92 molding compound and internal die construction; only the lead finish differs (matte tin vs. lead-tin alloy), with no impact on electrical or thermal specifications.

MPS6651 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 25 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 500mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 100MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

MPS6651 FAQ

1.How can I place an order for MPS6651 through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS6651 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 MPS6651 reliable?

The price and inventory of MPS6651 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS6651 is usually 5 days.

3.What payment methods are accepted for MPS6651?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS6651 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS6651?

MPS6651 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS6651 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 MPS6651?

For technical support, including MPS6651 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS6651 requirements.

6.How does Aetrix verify that MPS6651 is sourced from the original manufacturer or authorized distributors?

All MPS6651 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 MPS6651 meets industry standards.

7.What is the process for return or replacement of MPS6651?

All MPS6651 units undergo pre-shipment inspection (PSI). If there is an issue with MPS6651, 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 MPS6651 part is unused and in its original packaging.

Return procedure for MPS6651:

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…