MMBT4401_D87Z Equivalent & Substitute Parts

Part Overview

The MMBT4401_D87Z is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, and 250 MHz transition frequency in a surface mount SOT-23-3 package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from onsemi and other manufacturers provide identical or superior electrical characteristics while maintaining the same package footprint and pin configuration.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	40	V
Collector Current (Max)	600	mA
Vce Saturation (Max) @ Ib, Ic	750 mV @ 50 mA, 500 mA	V
DC Current Gain (hFE Min) @ Ic, Vce	100 @ 150 mA, 1 V	—
Power Dissipation (Max)	350	mW
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	—

Substitute Part Grouping Explanation

Substitution of the MMBT4401_D87Z is determined by strict electrical and mechanical compatibility. The following criteria define acceptable substitutes:

Primary Substitution Criteria:

Transistor type: NPN
Collector-emitter breakdown voltage: ≥40 V
Collector current rating: ≥600 mA
DC current gain (hFE): ≥100 @ 150 mA, 1 V
Transition frequency: ≥250 MHz
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating temperature range: −55°C to +150°C minimum

Direct Equivalents are parts with identical base part numbers from onsemi (MMBT4401 series) that meet all electrical specifications and maintain the same package designation. These include MMBT4401LT3G, SMMBT4401LT1G, and MMBT4401LT1G, which differ only in packaging format (Cut Tape, Tape & Reel) and product status (Active vs. Obsolete).

Cross-Manufacturer Direct Substitutes are parts from alternative manufacturers (Diodes Incorporated, Micro Commercial Co, Nexperia USA Inc.) with the MMBT4401 base designation that maintain electrical equivalence and package compatibility.

Similar Parts include transistors with different base part numbers but equivalent or superior electrical performance within the same package family. These parts may have variations in power dissipation, transition frequency, or current gain that do not degrade circuit performance.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE (Min)	fT MHz	P (Max) mW	Package	Status
MMBT4401_D87Z	onsemi	600	40	100	250	350	SOT-23-3	Obsolete
MMBT4401LT3G	onsemi	600	40	100	250	300	SOT-23-3	Active
SMMBT4401LT1G	onsemi	600	40	100	250	300	SOT-23-3	Active
MMBT4401LT1G	onsemi	600	40	100	250	300	SOT-23-3	Active
MMBT4401-7-F	Diodes Incorporated	600	40	100	250	310	SOT-23-3	Active
MMBT4401-TP	Micro Commercial Co	600	40	100	250	350	SOT-23-3	Active
MMBT4401Q-13-F	Diodes Incorporated	600	40	100	250	310	SOT-23-3	Active
PMBT4401,235	Nexperia USA Inc.	600	40	100	250	250	SOT-23-3	Active
MMBT6429LT1G	onsemi	200	45	500	700	225	SOT-23-3	Active
BC817-25-7-F	Diodes Incorporated	500	45	160	100	310	SOT-23-3	Active
BC817-25Q-7-F	Diodes Incorporated	500	45	160	100	350	SOT-23-3	Active

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation):

MMBT4401LT3G, SMMBT4401LT1G, and MMBT4401LT1G from onsemi are direct functional equivalents with active product status. These parts maintain identical electrical specifications and package compatibility. MMBT4401LT3G and MMBT4401LT1G are available in high inventory quantities (605,300 and 889,091 units respectively), ensuring supply chain continuity. Both are RoHS3 compliant and REACH unaffected.

Cross-Manufacturer Alternatives:

MMBT4401-7-F and MMBT4401Q-13-F from Diodes Incorporated provide electrical equivalence with AEC-Q101 automotive qualification. These parts are suitable for applications requiring automotive-grade components. MMBT4401-TP from Micro Commercial Co offers the highest inventory availability (1,000,400 units) and matches the original 350 mW power rating.

PMBT4401,235 from Nexperia USA Inc. provides automotive-grade performance with AEC-Q100 qualification and the lowest power dissipation rating (250 mW), suitable for power-sensitive applications.

Similar Parts for Specific Applications:

MMBT6429LT1G is suitable only for applications where reduced collector current (200 mA maximum) is acceptable. This part offers superior transition frequency (700 MHz) and higher DC current gain (500 minimum), making it appropriate for high-frequency or high-impedance circuits.

BC817-25-7-F and BC817-25Q-7-F are suitable only for applications where reduced collector current (500 mA maximum) and transition frequency (100 MHz) are acceptable. These parts offer higher DC current gain (160 minimum) and higher collector-emitter breakdown voltage (45 V), beneficial for low-noise or high-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can MMBT4401LT3G directly replace MMBT4401_D87Z without circuit modification?

A: Yes. MMBT4401LT3G is a direct functional equivalent with identical electrical specifications (40 V Vce(br), 600 mA Ic, 100 hFE minimum, 250 MHz fT) and the same SOT-23-3 package. The only difference is product status (Active vs. Obsolete) and packaging format. No circuit modification is required.

Q: What is the difference between MMBT4401LT3G, SMMBT4401LT1G, and MMBT4401LT1G?

A: All three parts are onsemi MMBT4401 variants with identical electrical specifications. The differences are packaging format: MMBT4401LT3G and MMBT4401LT1G are supplied in Cut Tape & Digi-Reel format, while SMMBT4401LT1G is supplied in Tape & Reel format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Are Diodes Incorporated MMBT4401-7-F and MMBT4401Q-13-F suitable replacements?

A: Yes, both are suitable direct replacements with identical electrical specifications. MMBT4401-7-F and MMBT4401Q-13-F include AEC-Q101 automotive qualification, making them appropriate for automotive applications. MMBT4401Q-13-F is supplied in Tape & Reel format, while MMBT4401-7-F is supplied in Cut Tape & Digi-Reel format.

Q: Can BC817-25-7-F replace MMBT4401_D87Z?

A: BC817-25-7-F is not a direct replacement. While it shares the SOT-23-3 package and maintains NPN type, it has reduced maximum collector current (500 mA vs. 600 mA) and reduced transition frequency (100 MHz vs. 250 MHz). It is suitable only for applications where these reduced ratings do not compromise performance.

Q: Can MMBT6429LT1G replace MMBT4401_D87Z?

A: MMBT6429LT1G is not a direct replacement. It has significantly reduced maximum collector current (200 mA vs. 600 mA), making it unsuitable for circuits requiring 600 mA operation. It is suitable only for low-current applications where the superior transition frequency (700 MHz) and higher DC current gain (500 minimum) provide circuit benefits.

Q: What is the significance of RoHS3 compliance and REACH status?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements for lead-free and restricted substance content. REACH Unaffected status indicates the part is not subject to Registration, Evaluation, Authorization and Restriction of Chemicals regulations. All active substitute parts listed are RoHS3 compliant and REACH unaffected, ensuring regulatory compliance for new designs.

Q: Does packaging format (Cut Tape vs. Tape & Reel) affect electrical performance?

A: No. Packaging format affects only procurement, storage, and assembly handling. Electrical specifications and performance are identical regardless of packaging format. Selection should be based on assembly equipment compatibility and supply chain requirements.

Q: What is the difference between automotive-qualified parts (AEC-Q101, AEC-Q100) and standard parts?

A: Automotive-qualified parts undergo additional testing and qualification per AEC standards to ensure reliability in automotive environments. MMBT4401-7-F and MMBT4401Q-13-F (AEC-Q101) and PMBT4401,235 (AEC-Q100) are suitable for automotive applications. Standard parts are suitable for general industrial and consumer applications.

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