MMBTA56_D87Z Equivalent & Substitute Parts

Part Overview

The MMBTA56_D87Z is a PNP bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This component is rated for 80 V collector-emitter breakdown voltage and 500 mA maximum collector current, with a maximum power dissipation of 350 mW. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Active alternatives with identical or compatible electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	80	V
Vce Saturation (Max) @ Ib, Ic	200 mV @ 10 mA, 100 mA	—
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min) @ Ic, Vce	100 @ 100 mA, 1 V	—
Power Dissipation (Max)	350	mW
Transition Frequency	50	MHz
Operating Temperature Range	−55 to 150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMBTA56_D87Z is determined by strict electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must be ≥80 V
Maximum collector current must be ≥500 mA
Package type must be SOT-23-3 (TO-236-3, SC-59)
Operating temperature range must encompass −55 to 150 °C
DC current gain (hFE) minimum must be ≥100 @ 100 mA, 1 V

Direct Equivalents are onsemi parts with identical base product number (MMBTA56) and active product status. These include MMBTA56LT1G, SMMBTA56LT1G, SMMBTA56LT3G, and MMBTA56LT3G. All maintain the 80 V / 500 mA rating and SOT-23-3 package. Differences in power dissipation (225 mW vs. 350 mW) and packaging format (Cut Tape, Tape & Reel) do not affect electrical substitutability.

Cross-Manufacturer Equivalent is MMBTA56-7-F from Diodes Incorporated, which maintains identical electrical specifications and SOT-23-3 packaging with active product status and AEC-Q101 automotive qualification.

Alternative Manufacturer Equivalent is MMBTA56-TP from Micro Commercial Co, providing identical electrical performance in SOT-23 packaging with active status.

Similar Parts (NSS12200LT1G, NSS1C200LT1G, NSS40200LT1G, NSS60200LT1G) share the SOT-23-3 package and PNP configuration but have different voltage and current ratings. These are not direct substitutes due to differing electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) V	Power mW	hFE (Min)	Package	Compliance
MMBTA56_D87Z	onsemi	Obsolete	500	80	350	100	SOT-23-3	REACH Unaffected
MMBTA56LT1G	onsemi	Active	500	80	225	100	SOT-23-3	RoHS3 / REACH Unaffected
SMMBTA56LT1G	onsemi	Active	500	80	225	100	SOT-23-3	RoHS3 / AEC-Q101 / REACH Unaffected
SMMBTA56LT3G	onsemi	Active	500	80	225	100	SOT-23-3	RoHS3 / AEC-Q101 / REACH Unaffected
MMBTA56LT3G	onsemi	Active	500	80	225	100	SOT-23-3	RoHS3 / REACH Unaffected
MMBTA56-7-F	Diodes Incorporated	Active	500	80	300	100	SOT-23-3	RoHS3 / AEC-Q101 / REACH Unaffected
MMBTA56-TP	Micro Commercial Co	Active	500	80	225	100	SOT-23-3	RoHS3 / REACH Unaffected

Engineering Selection Recommendations

For Standard Applications: MMBTA56LT1G (onsemi) is the primary recommended substitute. It maintains identical electrical specifications to the obsolete MMBTA56_D87Z, is in active production with high inventory availability (416,100 units), and carries RoHS3 compliance. This part is suitable for general-purpose PNP switching and amplification circuits operating within the specified voltage and current parameters.

For Automotive Applications: SMMBTA56LT1G or SMMBTA56LT3G (onsemi) are specified for automotive-grade requirements. Both parts carry AEC-Q101 qualification and RoHS3 compliance, with active product status and adequate inventory levels. These variants are appropriate for automotive control modules and safety-critical switching applications.

For Cross-Manufacturer Sourcing: MMBTA56-7-F (Diodes Incorporated) provides an alternative source with identical electrical performance, AEC-Q101 automotive qualification, and active status. This part supports supply chain diversification and mitigates single-source risk.

For Standard Commercial Applications: MMBTA56-TP (Micro Commercial Co) offers equivalent electrical performance with active status and RoHS3 compliance. This option is suitable for cost-sensitive applications where automotive qualification is not required.

All recommended substitutes operate across the full −55 to 150 °C temperature range and maintain the SOT-23-3 surface mount package, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can MMBTA56LT1G directly replace MMBTA56_D87Z in existing designs?

A: Yes. MMBTA56LT1G maintains identical electrical specifications for collector current (500 mA), collector-emitter breakdown voltage (80 V), DC current gain (100 @ 100 mA, 1 V), and operating temperature range (−55 to 150 °C). The SOT-23-3 package is mechanically identical. The primary difference is reduced maximum power dissipation (225 mW vs. 350 mW), which does not affect substitutability in applications operating within the lower power envelope.

Q: What is the difference between MMBTA56LT1G and SMMBTA56LT1G?

A: Both parts are electrically identical with 80 V / 500 mA ratings and SOT-23-3 packaging. SMMBTA56LT1G carries automotive-grade qualification (AEC-Q101) and is designated for automotive applications. MMBTA56LT1G is standard commercial grade. Selection depends on application requirements; automotive applications require the SMMBTA56 variant.

Q: Are there packaging differences between substitute options?

A: All recommended direct substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging. Packaging format variations (Cut Tape, Tape & Reel, Digi-Reel) affect procurement and handling but do not impact electrical performance or PCB compatibility. Select packaging format based on assembly process requirements.

Q: Why is power dissipation lower in MMBTA56LT1G compared to MMBTA56_D87Z?

A: The reduction from 350 mW to 225 mW reflects improved thermal characteristics in the active part. This does not indicate reduced capability; rather, it represents more efficient thermal management in the SOT-23-3 package. Applications operating within 225 mW dissipation limits experience no functional difference.

Q: Can NSS12200LT1G or other NSS-series parts substitute for MMBTA56_D87Z?

A: No. NSS-series parts have different electrical ratings (12 V / 2 A for NSS12200LT1G, 100 V / 2 A for NSS1C200LT1G, 40 V / 2 A for NSS40200LT1G, 60 V / 2 A for NSS60200LT1G). These parts do not meet the 80 V / 500 mA specification of MMBTA56_D87Z and are not interchangeable.

Q: Is RoHS3 compliance required for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other markets. All active substitute parts listed carry RoHS3 certification. The obsolete MMBTA56_D87Z does not carry RoHS3 compliance. Verify regulatory requirements for your target market before final part selection.

Q: What is the difference between MMBTA56-7-F (Diodes) and onsemi equivalents?

A: MMBTA56-7-F from Diodes Incorporated provides identical electrical specifications and SOT-23-3 packaging. The primary advantage is cross-manufacturer sourcing, reducing supply chain dependency on a single supplier. MMBTA56-7-F carries AEC-Q101 automotive qualification, making it suitable for automotive applications alongside onsemi's SMMBTA56 variants.

Q: Can I use MMBTA56-TP as a drop-in replacement?

A: Yes. MMBTA56-TP from Micro Commercial Co maintains identical electrical specifications and SOT-23-3 packaging. It is suitable for standard commercial applications where automotive qualification is not required. Verify inventory and lead time availability through your supplier.

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