BSR13 Equivalent & Substitute Parts

Part Overview

The BSR13 is an NPN bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This device is rated for 30 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 350 mW power dissipation. The BSR13 operates across a temperature range of -55°C to 150°C and features a transition frequency of 250 MHz.

The BSR13 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where the original part is no longer manufactured or stocked.

Key Parameters

Parameter	BSR13 Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	350	mW
Frequency - Transition	250	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	1.6V @ 50mA, 500mA	—

Substitute Part Grouping Explanation

Substitute parts for the BSR13 are classified based on electrical parameter compatibility within the SOT-23-3 surface mount package. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor type (NPN)
Package type (SOT-23-3 / TO-236-3)
Mounting type (Surface Mount)
Collector-emitter breakdown voltage (minimum 30 V)
Maximum collector current (minimum 500 mA for direct substitution)
Operating temperature range (-55°C to 150°C)

Substitution Categories:

Direct Substitutes meet or exceed all critical electrical parameters of the BSR13 while maintaining identical package specifications. These parts are pin-compatible and functionally equivalent.

Similar Substitutes share the same package and basic transistor type but differ in one or more electrical specifications. These parts are suitable for applications where the BSR13's specific performance characteristics are not fully required, or where enhanced performance is acceptable.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency (Transition) MHz	Package	Product Status	RoHS Status
BSR13	onsemi	500	30	350	250	SOT-23-3	Obsolete	—
MMBT2222LT1G	onsemi	600	30	300	250	SOT-23-3	Active	ROHS3 Compliant
BC848BLT1G	onsemi	100	30	300	100	SOT-23-3	Active	ROHS3 Compliant
BC848BLT3G	onsemi	100	30	300	100	SOT-23-3	Active	ROHS3 Compliant
BC848CLT1G	onsemi	100	30	300	100	SOT-23-3	Active	ROHS3 Compliant
BC849BLT1G	onsemi	100	30	300	100	SOT-23-3	Active	ROHS3 Compliant
MMBT2222ALT1G	onsemi	600	40	225	300	SOT-23-3	Active	ROHS3 Compliant
MMBT2222ALT3G	onsemi	600	40	300	300	SOT-23-3	Active	ROHS3 Compliant
MMBT4401LT1G	onsemi	600	40	300	250	SOT-23-3	Active	ROHS3 Compliant
MMBT4401LT3G	onsemi	600	40	300	250	SOT-23-3	Active	ROHS3 Compliant
MMBT6429LT1G	onsemi	200	45	225	700	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitution (Recommended for Obsolete Part Replacement):

MMBT2222LT1G is the primary direct substitute for the BSR13. This part maintains the 30 V collector-emitter breakdown voltage and 250 MHz transition frequency specifications. The MMBT2222LT1G exceeds the BSR13 collector current rating (600 mA vs. 500 mA) and is rated for active production status with ROHS3 compliance. The part is available in Cut Tape and Digi-Reel packaging formats.

Enhanced Performance Alternatives:

MMBT2222ALT1G and MMBT2222ALT3G provide increased collector-emitter breakdown voltage (40 V vs. 30 V) and higher transition frequency (300 MHz vs. 250 MHz). MMBT2222ALT1G carries AEC-Q101 automotive qualification. These parts are suitable for applications requiring enhanced voltage headroom or higher frequency performance.

MMBT4401LT1G and MMBT4401LT3G offer 40 V breakdown voltage with 600 mA collector current capability. These parts maintain the 250 MHz transition frequency of the BSR13 while providing improved voltage margin.

Lower Current Applications:

BC848BLT1G, BC848BLT3G, BC848CLT1G, and BC849BLT1G are suitable for applications where collector current requirements do not exceed 100 mA. These parts maintain 30 V breakdown voltage and SOT-23-3 packaging but operate at reduced frequency (100 MHz).

High Frequency Applications:

MMBT6429LT1G provides 700 MHz transition frequency with 45 V breakdown voltage. This part is appropriate for RF and high-frequency switching applications where the BSR13's 250 MHz specification is insufficient. Maximum collector current is limited to 200 mA.

All recommended substitutes are manufactured by onsemi, operate across the -55°C to 150°C temperature range, and are housed in SOT-23-3 packages compatible with BSR13 PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222LT1G directly replace BSR13 in existing designs?

A: Yes. MMBT2222LT1G is pin-compatible with BSR13 in SOT-23-3 packaging. Both parts share identical collector-emitter breakdown voltage (30 V), transition frequency (250 MHz), and DC current gain specifications. MMBT2222LT1G exceeds BSR13 current rating (600 mA vs. 500 mA), making it functionally equivalent for all applications where BSR13 was specified.

Q: What is the difference between MMBT2222LT1G and MMBT2222ALT1G?

A: MMBT2222ALT1G features 40 V collector-emitter breakdown voltage compared to 30 V for MMBT2222LT1G. MMBT2222ALT1G also provides 300 MHz transition frequency versus 250 MHz. MMBT2222ALT1G carries AEC-Q101 automotive qualification. Both parts maintain 600 mA maximum collector current and SOT-23-3 packaging. MMBT2222ALT1G is suitable for applications requiring higher voltage margins or automotive-grade reliability.

Q: Are BC848 series parts suitable replacements for BSR13?

A: BC848 series parts (BC848BLT1G, BC848BLT3G, BC848CLT1G) are not direct replacements for BSR13. These parts are limited to 100 mA maximum collector current compared to BSR13's 500 mA rating. BC848 series parts operate at 100 MHz transition frequency versus BSR13's 250 MHz. BC848 parts are appropriate only for low-current applications where the BSR13's current and frequency specifications exceed design requirements.

Q: What packaging options are available for substitute parts?

A: All substitute parts listed are housed in SOT-23-3 (TO-236-3, SC-59) surface mount packages, identical to BSR13. Packaging formats vary by part number: MMBT2222LT1G is available in Cut Tape and Digi-Reel; BC848BLT1G and BC848CLT1G are supplied in Cut Tape and Digi-Reel; BC848BLT3G and BC849BLT1G are supplied in Tape & Reel; MMBT2222ALT1G, MMBT2222ALT3G, MMBT4401LT1G, and MMBT4401LT3G are available in Cut Tape and Digi-Reel; MMBT6429LT1G is supplied in Tape & Reel format.

Q: Is RoHS compliance required for substitute selection?

A: All active substitute parts listed are ROHS3 compliant. The original BSR13 does not specify RoHS status. If RoHS compliance is a design requirement, all recommended substitutes meet this specification.

Q: Can MMBT6429LT1G replace BSR13 in standard applications?

A: MMBT6429LT1G is not a direct replacement for BSR13. This part is designed for high-frequency applications with 700 MHz transition frequency and 45 V breakdown voltage. Maximum collector current is limited to 200 mA, which is insufficient for BSR13's 500 mA specification. MMBT6429LT1G is appropriate only for RF and high-frequency switching circuits where BSR13's performance characteristics are inadequate.

Q: What is the significance of the "LT1G" and "LT3G" suffixes in part numbers?

A: The suffixes indicate packaging and tape format specifications. "LT1G" designates Cut Tape and Digi-Reel packaging. "LT3G" designates Tape & Reel packaging. Both formats contain identical electrical specifications and performance characteristics. Selection between these variants depends on procurement and assembly process requirements.

Q: Are there differences in DC current gain between substitute parts?

A: Yes. DC current gain (hFE) specifications vary across substitute parts. BSR13 specifies 100 @ 150mA, 10V. MMBT2222LT1G matches this specification. BC848 series parts specify 200 @ 2mA, 5V (BC848BLT1G, BC848BLT3G, BC849BLT1G) or 420 @ 2mA, 5V (BC848CLT1G). MMBT6429LT1G specifies 500 @ 100µA, 5V. These differences reflect different measurement conditions and are not directly comparable. Substitution decisions should be based on application-specific gain requirements rather than direct hFE comparison.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across -55°C to 150°C junction temperature range, identical to BSR13. This specification applies to all listed alternatives and ensures thermal compatibility in existing designs.

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