MMBT2907-D87Z Equivalent & Substitute Parts

Part Overview

The MMBT2907-D87Z is a PNP bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum collector current of 800 mA with a collector-emitter breakdown voltage of 40 V and maximum power dissipation of 350 mW. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility within the electrical and mechanical constraints of the original specification.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	800	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Power - Max	350	mW
Vce Saturation (Max) @ Ib, Ic	1.6V @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	20	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 10V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBT2907-D87Z is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory)
Package / Case: SOT-23-3 (TO-236-3, SC-59) for mechanical and thermal compatibility
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 40 V
Current - Collector (Ic) (Max): Must equal or exceed 800 mA
Power - Max: Must equal or exceed 350 mW
Operating Temperature Range: Must encompass -55°C to 150°C
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Vce Saturation characteristics
DC Current Gain (hFE)
Current - Collector Cutoff (Max)
Moisture Sensitivity Level

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Full Electrical Equivalents: Parts meeting or exceeding all primary electrical specifications (Ic ≥ 800 mA, Vce(BR) ≥ 40 V, P ≥ 350 mW) in SOT-23-3 packaging.

Category B - Functional Substitutes: Parts with reduced maximum collector current (Ic < 800 mA) or reduced power dissipation (P < 350 mW) but maintaining SOT-23-3 packaging and adequate voltage rating. These are suitable for applications where the full current capability of the original part is not required.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max) [mA]	Vce(BR) (Max) [V]	Power (Max) [mW]	Package	Product Status	Operating Temp [°C]
MMBT2907-D87Z	onsemi	PNP	800	40	350	SOT-23-3	Obsolete	-55 to 150
30A02CH-TL-E	onsemi	PNP	700	30	700	3-CPH	Active	—
BC807-16LT1G	onsemi	PNP	500	45	300	SOT-23-3	Active	-55 to 150
BC807-16LT3G	onsemi	PNP	500	45	300	SOT-23-3	Active	-55 to 150
BC807-25LT1G	onsemi	PNP	500	45	300	SOT-23-3	Active	-55 to 150
BC807-25LT3G	onsemi	PNP	500	45	300	SOT-23-3	Active	-55 to 150
BC807-40LT1G	onsemi	PNP	500	45	300	SOT-23-3	Active	-55 to 150
BC807-40LT3G	onsemi	PNP	500	45	300	SOT-23-3	Active	-55 to 150
BC857ALT1G	onsemi	PNP	100	45	300	SOT-23-3	Active	-55 to 150
BC857BLT1G	onsemi	PNP	100	45	300	SOT-23-3	Active	-55 to 150
BC857CLT1G	onsemi	PNP	100	45	300	SOT-23-3	Active	-55 to 150

Engineering Selection Recommendations

Active Status Requirement: All substitute parts listed are classified as Active products, ensuring ongoing availability and manufacturing support. The original MMBT2907-D87Z is obsolete and should not be specified for new designs.

Package Compatibility: The BC807 series (BC807-16LT1G, BC807-16LT3G, BC807-25LT1G, BC807-25LT3G, BC807-40LT1G, BC807-40LT3G) and BC857 series (BC857ALT1G, BC857BLT1G, BC857CLT1G) maintain identical SOT-23-3 packaging, enabling direct mechanical substitution on existing PCB layouts.

Electrical Performance Considerations:

The BC807 series provides a collector-emitter breakdown voltage of 45 V, exceeding the original 40 V specification. However, maximum collector current is reduced to 500 mA and maximum power dissipation to 300 mW. These parts are suitable for applications where the circuit design does not require the full 800 mA current capability of the original part.

The BC857 series further reduces maximum collector current to 100 mA, making these parts applicable only to low-current signal amplification circuits.

The 30A02CH-TL-E provides 700 mA collector current and 700 mW power dissipation but uses a different package (3-CPH) and has a reduced collector-emitter breakdown voltage of 30 V, making it unsuitable for direct substitution.

Compliance and Certifications: All active substitute parts carry RoHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements. Moisture Sensitivity Level remains at MSL 1 (Unlimited) across all candidates.

Packaging Format Selection: BC807 and BC857 variants are available in Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) formats. Selection between LT1G (Cut Tape) and LT3G (Tape & Reel) variants depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the BC807-40LT1G directly replace the MMBT2907-D87Z in all applications?

A: The BC807-40LT1G maintains identical SOT-23-3 packaging and operating temperature range (-55°C to 150°C). However, it provides 500 mA maximum collector current versus the original 800 mA, and 300 mW maximum power dissipation versus 350 mW. Direct substitution is valid only for circuits designed to operate within these reduced current and power limits. Circuit analysis is required to confirm the application does not demand the full 800 mA capability.

Q: What is the difference between BC807-16LT1G, BC807-25LT1G, and BC807-40LT1G?

A: These three variants are electrically identical in maximum ratings (500 mA, 45 V, 300 mW) and package (SOT-23-3). The numeric designations (16, 25, 40) indicate different DC current gain (hFE) specifications: BC807-16 has hFE minimum of 100, BC807-25 has hFE minimum of 160, and BC807-40 has hFE minimum of 250. Selection depends on the required current gain for the specific circuit application.

Q: Why is the 30A02CH-TL-E not recommended as a substitute?

A: Although the 30A02CH-TL-E provides higher power dissipation (700 mW) and adequate collector current (700 mA), it uses a different package (3-CPH) incompatible with SOT-23-3 PCB layouts. Additionally, its collector-emitter breakdown voltage of 30 V is below the original 40 V specification, creating potential reliability issues in circuits with voltage transients.

Q: Are BC857 series transistors suitable substitutes?

A: BC857 series transistors (BC857ALT1G, BC857BLT1G, BC857CLT1G) maintain SOT-23-3 packaging and full operating temperature range compatibility. However, they are limited to 100 mA maximum collector current, making them suitable only for low-signal applications. They are not appropriate for circuits requiring the 800 mA capability of the original part.

Q: What is the difference between Cut Tape (LT1G) and Tape & Reel (LT3G) packaging formats?

A: Cut Tape (CT) & Digi-Reel® format (LT1G) is supplied in individual tape segments suitable for manual assembly or small-volume production. Tape & Reel (TR) format (LT3G) is supplied on continuous reels for automated pick-and-place assembly. Electrical specifications are identical; selection depends on assembly process requirements and procurement volume.

Q: Do all substitute parts meet the original operating temperature range of -55°C to 150°C?

A: All BC807 and BC857 series parts listed maintain the full -55°C to 150°C operating temperature range. The 30A02CH-TL-E does not specify an operating temperature range in the provided data and should not be selected for applications requiring this specification.

Q: What is the significance of the hFE variations in BC807 variants?

A: DC current gain (hFE) determines the base current required to achieve a given collector current. Higher hFE (BC807-40 at 250 minimum) requires less base drive than lower hFE (BC807-16 at 100 minimum). Circuit design must account for the selected variant's hFE to ensure proper biasing and switching performance.

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