MPS6651 Equivalent & Substitute Parts

Part Overview

The MPS6651 is a PNP bipolar junction transistor manufactured by onsemi, rated for 25 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is packaged in a Through Hole TO-92 (TO-226-3) configuration and operates across a temperature range of -55°C to 150°C. The MPS6651 is classified as an obsolete product, necessitating identification of equivalent substitute components for ongoing design requirements and production continuity. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while accommodating modern component availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	25	V
Power - Max	625	mW
Frequency - Transition	100	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the MPS6651 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Transistor type must be PNP
Collector current rating must equal or exceed 1 A
Collector-emitter breakdown voltage must equal or exceed 25 V
Transition frequency must equal or exceed 100 MHz
Mounting type must be Through Hole
Package must be physically compatible with TO-92 footprint

Secondary Considerations:

Maximum power dissipation rating
DC current gain (hFE) characteristics
Operating temperature range
Product status and compliance certifications

The ZTX549 manufactured by Diodes Incorporated meets all primary compatibility criteria. The device exceeds the MPS6651 specifications in collector-emitter breakdown voltage (30 V versus 25 V), maximum power dissipation (1 W versus 625 mW), and operating temperature range (-55°C to 200°C versus -55°C to 150°C). The ZTX549 maintains identical collector current rating (1 A) and transition frequency (100 MHz), with TO-92 compatible E-Line packaging suitable for direct footprint replacement.

Parameter Comparison

Parameter	MPS6651 (onsemi)	ZTX549 (Diodes Inc.)	Unit
Transistor Type	PNP	PNP	—
Current - Collector (Ic) Max	1	1	A
Voltage - Collector Emitter Breakdown (Max)	25	30	V
Vce Saturation (Max)	600 mV @ 100mA, 1A	750 mV @ 200mA, 2A	mV
Current - Collector Cutoff (Max)	100	100	nA
DC Current Gain (hFE) Min	50 @ 500mA, 1V	100 @ 500mA, 2V	—
Power - Max	625	1000	mW
Frequency - Transition	100	100	MHz
Operating Temperature Range	-55 to 150	-55 to 200	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-92-3	E-Line-3 (TO-92 compatible)	—
Product Status	Obsolete	Active	—
RoHS Status	Non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The ZTX549 is a direct functional substitute for the MPS6651 in applications requiring PNP transistor operation at 1 A collector current and 25 V breakdown voltage. The ZTX549 provides superior electrical performance across all specified parameters: higher breakdown voltage rating (30 V), increased power dissipation capability (1 W), and extended operating temperature range (-55°C to 200°C).

The ZTX549 maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs and production continuity. The E-Line package is physically compatible with TO-92 footprints, enabling direct board-level substitution without layout modification.

Selection of the ZTX549 is appropriate for applications where the MPS6651 is specified but component availability is constrained. The substitute part's enhanced ratings provide design margin without requiring circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the ZTX549 directly replace the MPS6651 on existing PCB layouts?

A: Yes. The ZTX549 E-Line package is physically compatible with TO-92 footprints. Pin configuration and lead spacing conform to standard TO-92 dimensions, permitting direct substitution without PCB redesign.

Q: What are the key electrical differences between these parts?

A: The ZTX549 exceeds MPS6651 specifications in three areas: collector-emitter breakdown voltage (30 V versus 25 V), maximum power dissipation (1 W versus 625 mW), and operating temperature range (200°C versus 150°C maximum). Collector current rating (1 A) and transition frequency (100 MHz) are identical.

Q: Is the ZTX549 suitable for designs originally specified for the MPS6651?

A: Yes. The ZTX549 meets or exceeds all electrical requirements of the MPS6651. The higher ratings provide additional design margin and thermal headroom. No circuit modifications are required.

Q: What is the significance of the ZTX549's ROHS3 compliance status?

A: ROHS3 compliance indicates the ZTX549 conforms to current environmental and regulatory standards for electronic components. The MPS6651 is non-compliant, making the ZTX549 the appropriate choice for new designs and production requiring regulatory alignment.

Q: Are there any thermal considerations when substituting the ZTX549 for the MPS6651?

A: The ZTX549 supports higher maximum power dissipation (1 W versus 625 mW) and extended operating temperature range. These characteristics provide improved thermal performance. Existing thermal management provisions for the MPS6651 remain adequate for the ZTX549.

Q: How do the DC current gain characteristics compare?

A: The ZTX549 specifies minimum hFE of 100 at 500 mA and 2 V, compared to the MPS6651's minimum hFE of 50 at 500 mA and 1 V. The ZTX549's higher current gain may reduce base drive requirements in some circuit topologies.

Q: What is the product availability status for each part?

A: The MPS6651 is classified as obsolete with limited inventory (651 pieces). The ZTX549 is an active product with substantial inventory availability (10,200 pieces), ensuring reliable long-term sourcing for production requirements.

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