BD137-6-BP Equivalent & Substitute Parts

Part Overview

The BD137-6-BP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 60 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a TO-126 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part delivers 1.25 W maximum power dissipation with a minimum DC current gain of 40 at 150 mA collector current and 2 V collector-emitter voltage.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	1.5 A
Power - Max	1.25 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-225AA, TO-126-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BD137-6-BP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN configuration required
Voltage - Collector Emitter Breakdown (Max): 60 V minimum for direct equivalence; 45 V for reduced voltage applications
Current - Collector (Ic) (Max): 1.5 A minimum
Power - Max: 1.25 W minimum
Vce Saturation: 500mV @ 50mA, 500mA
Current - Collector Cutoff (Max): 100nA (ICBO)
DC Current Gain (hFE): 40 minimum @ 150mA, 2V
Operating Temperature: -55°C ~ 150°C (TJ)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: TO-225AA or TO-126-3
Supplier Device Package: TO-126 or TO-126-3

Compliance Criteria:

RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories: direct equivalents matching all electrical parameters at 60 V rating, and similar parts with reduced voltage ratings (45 V) that maintain all other electrical and mechanical specifications.

Parameter Comparison

Parameter	BD137-6-BP (Main)	BD137G	BD13516S	BD135G	BD135TG
Manufacturer	Micro Commercial Co	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Last Time Buy	Active	Last Time Buy
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	45 V	45 V	45 V
Current - Collector (Ic) (Max)	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A
Power - Max	1.25 W	1.25 W	1.25 W	1.25 W	1.25 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	40 @ 150mA, 2V	100 @ 150mA, 2V	40 @ 150mA, 2V	40 @ 150mA, 2V
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3
Supplier Device Package	TO-126	TO-126	TO-126-3	TO-126	TO-126
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Bulk	Bulk	Bulk	Tube

Engineering Selection Recommendations

Direct Equivalent (60 V Rating):

BD137G is the primary direct equivalent for BD137-6-BP. This onsemi part maintains identical electrical specifications including 60 V collector-emitter breakdown voltage, 1.5 A maximum collector current, 1.25 W power rating, and -55°C to 150°C operating temperature range. BD137G holds Active product status, ensuring long-term availability and supply continuity. Both parts are ROHS3 compliant and share identical mechanical specifications in TO-126 packaging. Selection of BD137G eliminates obsolescence risk while preserving all electrical performance characteristics.

Reduced Voltage Alternatives (45 V Rating):

BD135G and BD135TG are similar parts with 45 V collector-emitter breakdown voltage ratings. These parts maintain all other electrical parameters including 1.5 A maximum collector current, 1.25 W power dissipation, and identical saturation characteristics. BD135G is Active status, while BD135TG is Last Time Buy status. Both support the full -55°C to 150°C operating temperature range and are ROHS3 compliant. These alternatives are suitable for applications where the 60 V rating is not required.

BD13516S is a similar part with 45 V rating and elevated DC current gain (100 @ 150mA, 2V). This part carries Last Time Buy status and specifies only 150°C maximum junction temperature without lower temperature specification. BD13516S uses TO-126-3 supplier device package variant.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance. BD137G and BD135G offer the strongest long-term availability through Active product status. Parts designated Last Time Buy (BD13516S, BD135TG) have limited procurement windows and should be evaluated for future supply constraints.

Frequently Asked Questions (FAQ)

Q: Can BD137G directly replace BD137-6-BP in all applications?

A: Yes. BD137G matches all electrical and mechanical specifications of BD137-6-BP, including 60 V collector-emitter breakdown voltage, 1.5 A maximum collector current, 1.25 W power rating, and -55°C to 150°C operating temperature range. Both use TO-126 through-hole packaging. The primary difference is product status: BD137-6-BP is obsolete while BD137G is active.

Q: What is the difference between BD137G and BD135G?

A: The primary electrical difference is collector-emitter breakdown voltage: BD137G is rated 60 V while BD135G is rated 45 V. All other electrical parameters are identical, including 1.5 A maximum collector current, 1.25 W power dissipation, and saturation characteristics. Both support -55°C to 150°C operating temperature. BD135G is suitable for applications not requiring the 60 V rating.

Q: Why does BD13516S specify only 150°C maximum temperature without a lower limit?

A: The provided specification for BD13516S lists 150°C (TJ) without a lower temperature specification. This differs from other parts which specify -55°C ~ 150°C (TJ). Applications requiring operation below room temperature should use BD137G, BD135G, or BD135TG instead.

Q: What is the significance of DC Current Gain differences between parts?

A: BD13516S specifies minimum DC current gain of 100 @ 150mA, 2V, compared to 40 for other parts. Higher current gain indicates stronger amplification capability at specified operating conditions. Selection depends on circuit requirements; parts with 40 minimum gain are interchangeable with BD137-6-BP, while BD13516S offers enhanced gain characteristics.

Q: Are packaging differences between TO-126 and TO-126-3 significant for substitution?

A: Both TO-126 and TO-126-3 are through-hole packages with identical pin configurations and mechanical footprints. The designation difference reflects supplier packaging variants. Substitution between these package types is mechanically compatible for through-hole PCB applications.

Q: Which substitute part offers the best long-term availability?

A: BD137G offers the strongest availability through Active product status. BD135G also maintains Active status. Parts designated Last Time Buy (BD13516S, BD135TG) have limited procurement windows and should be evaluated for future supply constraints in long-term designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. BD137G, BD13516S, BD135G, and BD135TG are all ROHS3 compliant, matching the compliance status of BD137-6-BP.

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