MMBT3906_D87Z Equivalent & Substitute Parts

Part Overview

The MMBT3906_D87Z is a PNP bipolar junction transistor manufactured by onsemi in SOT-23-3 surface mount packaging. This device is rated for 40 V collector-emitter breakdown voltage, 200 mA maximum collector current, and 350 mW power dissipation. The part is currently listed as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and package equivalence. The following alternatives maintain functional compatibility with the original MMBT3906_D87Z design requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector-Emitter Breakdown Voltage (Max)	40	V
Collector Current (Max)	200	mA
Power Dissipation (Max)	350	mW
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 50 mA	—
DC Current Gain (hFE Min) @ Ic, Vce	100 @ 10 mA, 1 V	—
Transition Frequency	250	MHz
Operating Temperature Range	−55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution compatibility is determined by the following critical parameters:

Electrical Specifications:

Transistor polarity (PNP)
Collector-emitter breakdown voltage: 40 V minimum
Collector current rating: 200 mA minimum
DC current gain (hFE): 100 minimum at specified conditions
Vce saturation characteristics
Transition frequency: 250 MHz minimum

Mechanical & Package Requirements:

Surface mount package: SOT-23-3 (TO-236-3, SC-59)
Pin configuration: 3-pin
Operating temperature range: −55°C to 150°C minimum

Environmental & Compliance:

Moisture sensitivity level: 1 (Unlimited)
RoHS compliance status
REACH compliance status

Parts are grouped into three categories:

Direct Equivalents: Parts with identical base specifications and active product status, suitable for direct replacement without design modification.

Similar Variants: Parts with matching electrical and mechanical parameters but different manufacturing codes or packaging options (tape & reel vs. cut tape), requiring verification of procurement specifications.

Cross-Manufacturer Alternatives: Parts from different manufacturers meeting identical electrical and package specifications, available for supply chain diversification.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	hFE (Min)	Vce Sat mV	Freq MHz	Temp °C	Package	Status	RoHS
MMBT3906_D87Z	onsemi	200	40	350	100	400	250	−55 to 150	SOT-23-3	Obsolete	—
MMBT3906LT1G	onsemi	200	40	300	100	400	250	−55 to 150	SOT-23-3	Active	ROHS3
SMMBT3906LT1G	onsemi	200	40	300	100	400	250	−55 to 150	SOT-23-3	Active	ROHS3
MMBT3906LT3G	onsemi	200	40	300	100	400	250	−55 to 150	SOT-23-3	Active	ROHS3
SMMBT3906LT3G	onsemi	200	40	300	100	400	250	−55 to 150	SOT-23-3	Active	ROHS3
MMBT3906,215	NXP Semiconductors	200	40	250	100	400	250	−55 to 150	SOT-23-3	Active	—
MMBT3906-7-F	Diodes Incorporated	200	40	300	100	400	250	−55 to 150	SOT-23-3	Active	ROHS3
MMBT3906-G	onsemi	200	40	200	100	400	300	−55 to 150	SOT-23-3	Obsolete	—
MMBT3906-HF	Comchip Technology	200	40	300	100	300	250	−55 to 150	SOT-23-3	Active	ROHS3
MMBT3906-TP	Micro Commercial Co	200	40	300	100	400	250	−55 to 150	SOT-23-3	Active	ROHS3
PMBT3906,235	NXP Semiconductors	200	40	250	100	400	250	−55 to 150	SOT-23-3	Active	—

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

MMBT3906LT1G and MMBT3906LT3G from onsemi are the recommended primary substitutes. Both parts maintain identical electrical specifications to the original MMBT3906_D87Z, feature active product status, and carry ROHS3 compliance certification. These parts are available in high inventory quantities and represent the most direct functional equivalents.

SMMBT3906LT1G and SMMBT3906LT3G are automotive-grade variants (AEC-Q101 qualified) of the onsemi MMBT3906 series. These parts are suitable for applications requiring automotive qualification and maintain all electrical and mechanical compatibility with the original part.

Cross-Manufacturer Alternatives:

MMBT3906-7-F from Diodes Incorporated provides an active, ROHS3-compliant alternative with automotive qualification (AEC-Q101). This part maintains full electrical equivalence and is available in high inventory.

MMBT3906-TP from Micro Commercial Co is an active, ROHS3-compliant substitute with matching electrical specifications and high inventory availability.

MMBT3906,215 and PMBT3906,235 from NXP Semiconductors are active alternatives with automotive qualification. These parts feature slightly reduced power dissipation (250 mW vs. 350 mW) but maintain all critical electrical parameters within specification.

Conditional Substitutes:

MMBT3906-HF from Comchip Technology is an active substitute with ROHS3 compliance. This part features a lower Vce saturation specification (300 mV vs. 400 mV), which may provide improved performance in saturation-mode applications but requires circuit verification.

MMBT3906-G from onsemi is obsolete and should not be selected for new designs, despite active inventory availability.

Selection Criteria:

For new designs and procurement, select from parts with active product status and ROHS3 compliance. For automotive applications, specify parts with AEC-Q101 qualification. For supply chain resilience, consider cross-manufacturer alternatives from Diodes Incorporated, Micro Commercial Co, or NXP Semiconductors.

Frequently Asked Questions (FAQ)

Q: Can MMBT3906LT1G directly replace MMBT3906_D87Z in existing designs?

A: Yes. MMBT3906LT1G maintains identical electrical specifications, package configuration, and pin assignment. The primary difference is product status (active vs. obsolete) and power dissipation rating (300 mW vs. 350 mW). The reduced power rating is not a functional limitation for most applications, as the original 350 mW specification provides design margin.

Q: What is the difference between MMBT3906LT1G and SMMBT3906LT1G?

A: Both parts are electrically and mechanically identical. SMMBT3906LT1G carries automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Select SMMBT3906LT1G for automotive designs; MMBT3906LT1G is suitable for general industrial and consumer applications.

Q: Are NXP MMBT3906,215 and PMBT3906,235 suitable replacements?

A: Yes, with the following consideration: Both NXP parts feature 250 mW power dissipation compared to the original 350 mW specification. This reduced rating is acceptable for most applications but should be verified against circuit power requirements. Both parts maintain identical electrical performance and package compatibility.

Q: What is the significance of the packaging designation (CT vs. TR)?

A: CT (Cut Tape) and Digi-Reel packaging is suitable for lower-volume procurement and manual assembly. TR (Tape & Reel) packaging is optimized for high-volume automated assembly. Both packaging formats contain identical components; selection depends on procurement volume and assembly process requirements.

Q: Can MMBT3906-HF from Comchip Technology be used as a direct substitute?

A: Yes, with circuit verification. MMBT3906-HF features a lower Vce saturation specification (300 mV vs. 400 mV at rated conditions). This characteristic may improve performance in saturation-mode switching applications but requires confirmation that the circuit design does not depend on the original saturation voltage specification.

Q: Why is MMBT3906-G listed as obsolete despite available inventory?

A: MMBT3906-G is designated obsolete by the manufacturer, indicating end-of-life status and no commitment to future availability or support. Existing inventory may be available through distributors, but new designs should not incorporate this part. Select active alternatives for long-term design support.

Q: Are all listed substitutes ROHS3 compliant?

A: Most active substitutes carry ROHS3 compliance certification. NXP parts (MMBT3906,215 and PMBT3906,235) do not list explicit ROHS3 status in provided specifications. Verify ROHS compliance status with the manufacturer or distributor if regulatory compliance is a design requirement.

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: All listed substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Storage and handling requirements are identical to the original MMBT3906_D87Z.

Q: Can substitute parts be mixed in the same production run?

A: Yes, provided all selected parts meet the electrical and mechanical specifications required by the circuit design. For traceability and quality control, document the specific part numbers used in each production batch. Cross-manufacturer substitution may require qualification testing per internal quality procedures.

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