MMBT5771 Equivalent & Substitute Parts

Part Overview

The MMBT5771 is a Surface Mount PNP Bipolar Junction Transistor (BJT) manufactured by onsemi, housed in a SOT-23-3 package. This component is rated for 15 V collector-emitter breakdown voltage and 200 mA maximum collector current, with a maximum power dissipation of 225 mW. The MMBT5771 is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while meeting current product availability and compliance standards.

Key Parameters

Parameter	MMBT5771 Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	15	V
Current - Collector (Ic) (Max)	200	mA
Power - Max	225	mW
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 50mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 10mA, 300mV	—
Current - Collector Cutoff (Max)	10	nA
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MMBT5771 are selected based on strict electrical parameter compatibility within the SOT-23-3 surface mount package. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: PNP (mandatory match)
Package: SOT-23-3 / TO-236-3 (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Voltage - Collector Emitter Breakdown: Must equal or exceed 15 V
Current - Collector (Max): Must equal or exceed 200 mA
Power - Max: Must equal or exceed 225 mW
Operating Temperature Range: Must encompass -55°C to 150°C
RoHS Compliance: ROHS3 Compliant (mandatory match)

Substitute parts are grouped into two categories based on their electrical ratings relative to the MMBT5771:

Category A - Direct Electrical Equivalents (Voltage and Current Matched): Parts with voltage ratings at or near 15 V and current ratings at or near 200 mA, maintaining identical power dissipation specifications.

Category B - Enhanced Capability Substitutes (Higher Voltage and/or Current Ratings): Parts with voltage ratings exceeding 15 V and/or current ratings exceeding 200 mA, providing superior electrical headroom while maintaining backward compatibility in circuits designed for the MMBT5771.

Parameter Comparison

Parameter	MMBT5771	MMBT4126LT1G	MMBT4403LT1G	MMBT4403LT3G	MMBT2907ALT1G	MMBT2907ALT3G	NSS20200LT1G	BC807-40-7-F
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max) [V]	15	25	40	40	60	60	20	45
Current - Collector (Ic) (Max) [mA]	200	200	600	600	600	600	2000	500
Power - Max [mW]	225	225	300	300	300	300	460	310
Vce Saturation (Max) @ Ib, Ic [V]	600mV @ 5mA, 50mA	400mV @ 5mA, 50mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	1.6V @ 50mA, 500mA	1.6V @ 50mA, 500mA	180mV @ 200mA, 2A	700mV @ 50mA, 500mA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 10mA, 300mV	120 @ 2mA, 1V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 10V	100 @ 150mA, 10V	250 @ 500mA, 2V	250 @ 100mA, 1V
Current - Collector Cutoff (Max) [nA]	10	—	—	—	10	10	100	100
Frequency - Transition [MHz]	—	250	200	200	200	200	100	100
Operating Temperature Range [°C]	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

MMBT4126LT1G (onsemi)

The MMBT4126LT1G provides direct electrical equivalence to the MMBT5771 with matched current and power ratings (200 mA, 225 mW). This part features a 25 V collector-emitter breakdown voltage, providing 67% additional voltage margin over the MMBT5771. The MMBT4126LT1G is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. This part is suitable for direct substitution in applications where the 15 V rating of the MMBT5771 is the limiting factor.

MMBT4403LT1G and MMBT4403LT3G (onsemi)

Both variants of the MMBT4403 series offer enhanced current handling (600 mA) and voltage rating (40 V) compared to the MMBT5771. These parts maintain the same SOT-23-3 package and operating temperature range. The MMBT4403LT1G is packaged in Cut Tape format with 824,300 units in stock, while the MMBT4403LT3G is packaged in Tape & Reel format with 46,872 units in stock. Both are Active status products with ROHS3 compliance. These parts are suitable for applications requiring higher current capacity or voltage headroom.

MMBT2907ALT1G and MMBT2907ALT3G (onsemi)

The MMBT2907 series provides the highest voltage rating (60 V) among available substitutes, with 600 mA current capacity and 300 mW power dissipation. The MMBT2907ALT1G is available in Cut Tape format with 1,598,400 units in stock, while the MMBT2907ALT3G is available in Tape & Reel format with 888,991 units in stock. Both variants are Active status products with ROHS3 compliance and 200 MHz transition frequency. These parts are suitable for applications requiring maximum voltage margin and higher current capacity.

NSS20200LT1G (onsemi)

The NSS20200LT1G offers the highest current capacity (2 A) among available substitutes with a 20 V collector-emitter breakdown voltage and 460 mW power dissipation. This part is classified as Active product status with ROHS3 compliance. The NSS20200LT1G is suitable for applications requiring significantly higher current handling while maintaining voltage compatibility near the MMBT5771 specification.

BC807-40-7-F (Diodes Incorporated)

The BC807-40-7-F is a cross-manufacturer substitute from Diodes Incorporated, offering 45 V voltage rating and 500 mA current capacity with 310 mW power dissipation. This part is classified as Active product status with ROHS3 compliance. The BC807-40-7-F provides an alternative sourcing option for applications requiring enhanced electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the MMBT4126LT1G directly replace the MMBT5771 in existing designs?

A: The MMBT4126LT1G is electrically compatible with the MMBT5771 for applications operating within the 15 V specification. Both parts share identical current (200 mA) and power (225 mW) ratings, identical operating temperature range (-55°C to 150°C), and identical SOT-23-3 package. The MMBT4126LT1G provides additional voltage margin (25 V vs. 15 V) without requiring circuit modifications.

Q: What is the primary difference between MMBT4403LT1G and MMBT4403LT3G?

A: Both parts are electrically identical with 40 V voltage rating, 600 mA current capacity, and 300 mW power dissipation. The primary difference is packaging format: MMBT4403LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while MMBT4403LT3G is supplied in Tape & Reel (TR) format. Selection depends on manufacturing process requirements and inventory management preferences.

Q: Why does the NSS20200LT1G have higher current capacity than the MMBT5771?

A: The NSS20200LT1G is a distinct product line designed for higher current applications (2 A vs. 200 mA). While this part exceeds the MMBT5771 current specification, it maintains voltage compatibility (20 V vs. 15 V) and operates within the same temperature range. The NSS20200LT1G is suitable for applications where the MMBT5771 current rating is insufficient.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant, matching the compliance status of the MMBT5771. All parts also maintain unlimited moisture sensitivity rating (MSL 1) and are classified as REACH Unaffected.

Q: What is the significance of transition frequency in substitute selection?

A: Transition frequency (fT) indicates the frequency at which transistor current gain drops to unity. The MMBT5771 does not specify transition frequency. Substitute parts range from 100 MHz (NSS20200LT1G, BC807-40-7-F) to 250 MHz (MMBT4126LT1G). Higher transition frequency provides better performance in high-frequency applications but is not required for direct substitution in DC or low-frequency circuits.

Q: Can the MMBT2907 series be used in applications designed for the MMBT5771?

A: The MMBT2907 series (60 V, 600 mA, 300 mW) exceeds all electrical specifications of the MMBT5771 (15 V, 200 mA, 225 mW). These parts are suitable for applications where the MMBT5771 is specified, provided circuit design does not depend on the lower voltage or current ratings. The MMBT2907 series provides maximum electrical margin and is suitable for designs requiring enhanced performance headroom.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in two primary packaging formats: Cut Tape (CT) & Digi-Reel format and Tape & Reel (TR) format. Both formats maintain identical electrical specifications and SOT-23-3 package dimensions. Selection depends on manufacturing equipment compatibility and production volume requirements. The MMBT4126LT1G is available only in Tape & Reel format.

Q: Is the BC807-40-7-F from Diodes Incorporated electrically equivalent to onsemi parts?

A: The BC807-40-7-F is electrically compatible with the MMBT5771 within the specified parameter ranges. This part offers 45 V voltage rating and 500 mA current capacity, exceeding the MMBT5771 specifications. The BC807-40-7-F provides cross-manufacturer sourcing flexibility while maintaining SOT-23-3 package compatibility and ROHS3 compliance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message