2N5551-BP Equivalent & Substitute Parts

Part Overview

The 2N5551-BP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. It features a maximum collector current of 600 mA, collector-emitter breakdown voltage of 160 V, and a maximum power dissipation of 625 mW in a Through Hole TO-92 package. The 2N5551-BP is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	600	mA
Voltage - Collector Emitter Breakdown (Max)	160	V
Power - Max	625	mW
Frequency - Transition	300	MHz
DC Current Gain (hFE) Min @ Ic, Vce	80 @ 10mA, 5V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitute parts for the 2N5551-BP are identified based on strict electrical and mechanical parameter matching within the NPN bipolar transistor category. The substitution criteria are:

Primary Matching Parameters:

Transistor Type: NPN
Current - Collector (Ic) Max: 600 mA
Voltage - Collector Emitter Breakdown (Max): 160 V
Power - Max: 625 mW
Frequency - Transition: 300 MHz
DC Current Gain (hFE) Min: 80 @ 10mA, 5V
Package / Case: TO-92-3
Mounting Type: Through Hole

Two substitute parts meet these electrical and mechanical specifications:

2N5551 (Solid State Inc.) — Parametric equivalent with active product status
2N5551 TIN/LEAD (Central Semiconductor Corp) — Parametric equivalent with active product status and alternative lead finish

Parameter Comparison

Parameter	2N5551-BP (Main)	2N5551 (SSI)	2N5551 TIN/LEAD (CSC)
Manufacturer	Micro Commercial Co	Solid State Inc.	Central Semiconductor Corp
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) Max	600 mA	600 mA	600 mA
Voltage - Collector Emitter Breakdown (Max)	160 V	160 V	160 V
Power - Max	625 mW	625 mW	625 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz
DC Current Gain (hFE) Min @ Ic, Vce	80 @ 10mA, 5V	80 @ 10mA, 5V	80 @ 10mA, 5V
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-65 to 150°C
Package / Case	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Non-compliant
Vce Saturation (Max) @ Ib, Ic	500mV @ 5mA, 50mA	—	200mV @ 5mA, 50mA

Engineering Selection Recommendations

2N5551 (Solid State Inc.) is the primary substitute for the obsolete 2N5551-BP. This part maintains full electrical and thermal parameter equivalence, operates within the same temperature range, and carries active product status with RoHS compliance certification. Procurement and long-term availability are supported.

2N5551 TIN/LEAD (Central Semiconductor Corp) is an alternative substitute that meets all electrical specifications and extends the operating temperature range to -65°C. However, this part is RoHS non-compliant. Selection of this part is appropriate only for applications where RoHS compliance is not a requirement or where the extended lower temperature rating (-65°C versus -55°C) provides design benefit. The lower Vce saturation specification (200mV versus 500mV) indicates improved saturation characteristics.

Both substitute parts are available in active production status, ensuring supply chain continuity for the obsolete 2N5551-BP.

Frequently Asked Questions (FAQ)

Q: Can the 2N5551 from Solid State Inc. directly replace the 2N5551-BP?

A: Yes. The 2N5551 (Solid State Inc.) is a parametric equivalent with identical electrical ratings, thermal specifications, and package configuration. Direct substitution is supported without circuit modification.

Q: What is the difference between 2N5551 and 2N5551 TIN/LEAD?

A: Both parts meet the same electrical specifications. The primary differences are: (1) Lead finish — TIN/LEAD uses tin/lead plating versus standard lead finish; (2) RoHS compliance — 2N5551 TIN/LEAD is RoHS non-compliant; (3) Operating temperature range — 2N5551 TIN/LEAD extends to -65°C minimum; (4) Vce saturation — 2N5551 TIN/LEAD specifies 200mV versus 500mV.

Q: Are all substitute parts available in TO-92-3 package?

A: Yes. All listed substitute parts use the TO-92-3 (TO-226AA) Through Hole package, ensuring mechanical and thermal compatibility with the original 2N5551-BP.

Q: Which substitute should I select for RoHS-compliant applications?

A: The 2N5551 from Solid State Inc. carries RoHS Compliant certification and is the appropriate choice for applications requiring RoHS compliance.

Q: Does the extended temperature range of 2N5551 TIN/LEAD affect circuit performance?

A: The extended lower temperature limit (-65°C versus -55°C) expands the operating envelope. All other electrical parameters remain equivalent. Selection depends on application temperature requirements and RoHS compliance needs.

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