MSB92WT1 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MSB92WT1 is a PNP bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current in a surface mount SC-70 (SOT-323) package. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to support ongoing production requirements, design updates, and supply chain continuity for applications utilizing this transistor topology.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Maximum)	500	mA
Collector-Emitter Breakdown Voltage	300	V
Power Dissipation (Maximum)	150	mW
Transition Frequency	50	MHz
Operating Temperature (Maximum)	150	°C
Package Type	SC-70, SOT-323	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the MSB92WT1 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Equivalents (Parametric Match): Parts MSB92WT1G, MSB92AWT1G, and MSB92ASWT1G maintain identical electrical specifications including 500 mA collector current, 300 V breakdown voltage, 150 mW power rating, and SC-70 (SOT-323) package configuration. These parts are manufactured by onsemi and share the MSB92 base product number. The primary distinction is product status and compliance certification. MSB92WT1G and MSB92AWT1G are active products with RoHS3 compliance, while MSB92ASWT1G offers the highest inventory availability.

Similar Alternatives (Reduced Current Rating): Parts MMSTA92-7-F (Diodes Incorporated) and PMSTA92,115 (Nexperia USA Inc.) provide equivalent voltage and frequency specifications but with reduced maximum collector current of 100 mA and increased power dissipation rating of 200 mW. These parts are suitable for applications where the full 500 mA current capability is not required. PMSTA92,115 includes automotive qualification (AEC-Q101).

Substitution eligibility is determined by matching the following critical parameters: transistor type (PNP), collector-emitter breakdown voltage (300 V), transition frequency (50 MHz), package type (SC-70/SOT-323), and mounting method (surface mount). Current rating and power dissipation must meet or exceed application requirements.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [mA]	Vce(br) [V]	Power [mW]	fT [MHz]	Product Status	RoHS Compliance
MSB92WT1	onsemi	500	300	150	50	Obsolete	Non-compliant
MSB92WT1G	onsemi	500	300	150	50	Active	RoHS3 Compliant
MSB92AWT1G	onsemi	500	300	150	50	Active	RoHS3 Compliant
MSB92ASWT1G	onsemi	500	300	150	50	Active	RoHS3 Compliant
MMSTA92-7-F	Diodes Incorporated	100	300	200	50	Active	RoHS3 Compliant
PMSTA92,115	Nexperia USA Inc.	100	300	200	50	Active	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Full Current Capability):

MSB92AWT1G and MSB92ASWT1G are recommended as primary substitutes for the obsolete MSB92WT1. Both parts maintain complete electrical equivalence with 500 mA collector current and 150 mW power dissipation. MSB92ASWT1G offers superior inventory availability (26,400 units) compared to MSB92AWT1G (29,100 units). Both parts carry active product status and RoHS3 compliance, supporting modern supply chain and regulatory requirements.

MSB92WT1G is an alternative direct equivalent with active status and RoHS3 compliance, though it exhibits a lower DC current gain specification (25 @ 1mA, 10V versus 120 @ 1mA, 10V for the other variants). Selection between these three parts should prioritize inventory availability and lead time requirements, as electrical performance is equivalent.

For Current-Limited Applications:

MMSTA92-7-F and PMSTA92,115 are suitable substitutes only when application circuit design accommodates the reduced 100 mA maximum collector current. Both parts maintain the 300 V breakdown voltage and 50 MHz transition frequency. PMSTA92,115 includes automotive-grade qualification (AEC-Q101) and is appropriate for automotive applications. MMSTA92-7-F provides extended operating temperature range (-55°C to 150°C) compared to the standard 150°C maximum.

Compliance Considerations:

All recommended substitutes are RoHS3 compliant and REACH unaffected, supporting regulatory compliance for new designs and production transitions. The MSB92WT1 original part is RoHS non-compliant and should be replaced in applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can MSB92WT1G be used as a direct replacement for MSB92WT1?

A: Yes. MSB92WT1G is electrically equivalent with identical 500 mA collector current, 300 V breakdown voltage, 150 mW power rating, and SC-70 (SOT-323) package. The primary differences are active product status and RoHS3 compliance. DC current gain specification differs (25 versus 120 @ 1mA, 10V), which may affect circuit biasing requirements in applications with tight gain tolerance specifications.

Q: What is the difference between MSB92AWT1G and MSB92ASWT1G?

A: Both parts are electrically identical with 500 mA collector current, 300 V breakdown voltage, and matching DC current gain (120 @ 1mA, 10V). The primary distinction is packaging format: MSB92AWT1G is supplied in Tape & Reel format with 29,100 units in stock, while MSB92ASWT1G is also Tape & Reel with higher inventory (26,400 units). Selection should be based on procurement lead time and inventory availability.

Q: Can MMSTA92-7-F or PMSTA92,115 replace MSB92WT1 in all applications?

A: No. MMSTA92-7-F and PMSTA92,115 have reduced maximum collector current (100 mA versus 500 mA). These parts are suitable only for applications where circuit design operates at or below 100 mA collector current. Applications requiring the full 500 mA capability must use MSB92WT1G, MSB92AWT1G, or MSB92ASWT1G.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use SC-70 or SOT-323 package designation, which are equivalent surface mount packages. Pin configuration and footprint compatibility are maintained across all listed substitutes.

Q: Which substitute part is recommended for automotive applications?

A: PMSTA92,115 is qualified to AEC-Q101 automotive standard and is the appropriate selection for automotive-grade applications. This part maintains 300 V breakdown voltage and 50 MHz transition frequency with 100 mA maximum collector current.

Q: What is the impact of different DC current gain specifications among the substitutes?

A: DC current gain (hFE) affects base current requirements for saturation. MSB92WT1G specifies 25 @ 1mA, 10V, while MSB92AWT1G and MSB92ASWT1G specify 120 @ 1mA, 10V. Applications with fixed base current biasing may require circuit adjustment when switching between these parts. Applications using proportional biasing or feedback control are less sensitive to this variation.

Q: Is the MSB92WT1 still available for new designs?

A: No. MSB92WT1 is classified as obsolete product status. New designs should specify MSB92AWT1G or MSB92ASWT1G for full electrical equivalence with active product support and RoHS3 compliance.

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