2SC2497AQ Equivalent & Substitute Parts

Part Overview

The 2SC2497AQ is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 60 V collector-emitter breakdown voltage and 1.5 A maximum collector current. This device is packaged in TO-126B-A1 through-hole configuration and is designed for general-purpose switching and amplification applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	1.2	W
Frequency - Transition	150	MHz
Operating Temperature (Max)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the 2SC2497AQ is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Voltage Rating: Substitute parts must have a collector-emitter breakdown voltage (VCEO) equal to or greater than 60 V to ensure safe operation within the original design envelope.

Current Rating: Substitute parts must support a maximum collector current (Ic) of at least 1.5 A to handle the specified load conditions.

Package Compatibility: Substitute parts must be available in through-hole TO-126 or TO-126-3 packaging to maintain mechanical fit and thermal characteristics in existing PCB layouts.

Transistor Type: All substitutes must be NPN configuration to preserve circuit polarity and biasing relationships.

Operating Temperature: Substitute parts must support operation at 150°C junction temperature to maintain thermal margin in the application.

Parts are grouped into two categories based on these criteria:

Category A - Direct Electrical Equivalents (60 V, 1.5 A): Parts meeting all primary electrical specifications with matching voltage and current ratings.

Category B - Higher Current Capability (60 V, ≥1.5 A): Parts exceeding the 1.5 A specification, suitable for applications requiring additional current margin or future design scaling.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	VCEO (Max) [V]	Power (Max) [W]	fT [MHz]	Package	Status
2SC2497AQ	Panasonic	1.5	60	1.2	150	TO-126B-A1	Obsolete
BD137G	onsemi	1.5	60	1.25	—	TO-126	Active
BD13716STU	onsemi	1.5	60	1.25	—	TO-126-3	Active
BD787G	onsemi	4	60	15	50	TO-126	Active
2N5191G	onsemi	4	60	40	2	TO-126	Active
2N4922G	onsemi	1	60	30	3	TO-126	Active
BD135G	onsemi	1.5	45	1.25	—	TO-126	Active
BD135TG	onsemi	1.5	45	1.25	—	TO-126	Last Time Buy
BD13516STU	onsemi	1.5	45	1.25	—	TO-126-3	Active
BD135	STMicroelectronics	1.5	45	1.25	—	SOT-32-3	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

BD137G and BD13716STU are the preferred substitutes for the 2SC2497AQ. Both parts are manufactured by onsemi, maintain active product status, and provide identical electrical specifications: 1.5 A collector current, 60 V breakdown voltage, and 1.25 W power dissipation. BD137G is supplied in bulk packaging with TO-126 case, while BD13716STU is supplied in tube packaging with TO-126-3 case. Both support the full operating temperature range to 150°C and carry ROHS3 compliance certification.

Secondary Substitutes (Higher Current Capability)

BD787G and 2N5191G provide increased current capacity at 4 A maximum collector current while maintaining 60 V voltage rating. These parts are suitable for applications requiring additional current margin or where design scaling to higher power levels is anticipated. BD787G offers 50 MHz transition frequency and 15 W power rating. Both parts carry active status and ROHS3 compliance.

Voltage-Reduced Alternatives (45 V Rating)

BD135G, BD135TG, and BD13516STU operate at 45 V maximum breakdown voltage, which is 15 V below the original 2SC2497AQ specification. These parts are suitable only for applications where the design voltage margin permits operation at 45 V. BD135TG carries Last Time Buy status, indicating limited future availability. All three maintain 1.5 A current rating and active or transitional product status with ROHS3 compliance.

Not Recommended

2N4922G is rated for only 1 A maximum collector current, below the 1.5 A requirement of the original part. This device is unsuitable for direct substitution in applications requiring full 1.5 A capacity.

Frequently Asked Questions (FAQ)

Q: Can BD137G directly replace 2SC2497AQ in existing designs?

A: Yes. BD137G matches the critical electrical parameters: 60 V breakdown voltage, 1.5 A collector current, and 1.25 W power dissipation. The TO-126 package is mechanically compatible with TO-126B-A1 footprints. Verify PCB layout accommodates the specific lead configuration of the TO-126 package variant.

Q: What is the difference between BD137G and BD13716STU?

A: Both parts have identical electrical specifications. The primary difference is packaging: BD137G is supplied in bulk with TO-126 case, while BD13716STU is supplied in tube with TO-126-3 case. Select based on procurement requirements and PCB assembly process compatibility.

Q: Can I use BD135G as a substitute for 2SC2497AQ?

A: BD135G is not recommended as a direct substitute. While it maintains 1.5 A current capacity, the maximum breakdown voltage is 45 V compared to the 60 V rating of the 2SC2497AQ. Use BD135G only if the application design voltage is confirmed to operate safely at 45 V or below.

Q: Why is 2N4922G listed but not recommended?

A: 2N4922G is rated for maximum 1 A collector current, which is below the 1.5 A specification of the 2SC2497AQ. This part cannot reliably handle the full design current and is unsuitable for direct substitution.

Q: Are there differences in DC current gain (hFE) between substitutes?

A: Yes. The 2SC2497AQ specifies minimum hFE of 80 at 1 A, 5 V. Substitute parts vary: BD137G and BD13716STU specify 40 at 150 mA, 2 V; BD135G and related parts specify 40 at 150 mA, 2 V. Verify biasing calculations accommodate the specified hFE values for each substitute part in your circuit design.

Q: What is the significance of "Last Time Buy" status for BD135TG?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. While currently available, future procurement may become impossible. For new designs or long-term production, select parts with Active status such as BD137G or BD13716STU.

Q: Can I use higher current-rated parts like BD787G or 2N5191G?

A: Yes, if the application circuit design permits. These parts provide 4 A capacity and higher power dissipation, offering additional current margin. However, verify that the higher power rating does not introduce thermal management complications in the existing PCB layout. The transition frequency differs: BD787G operates at 50 MHz while 2N5191G operates at 2 MHz. Select based on frequency requirements of your application.

Q: What packaging considerations apply when substituting?

A: The 2SC2497AQ uses TO-126B-A1 package. Substitute parts are available in TO-126 or TO-126-3 variants. These packages are mechanically similar but may have minor lead spacing or dimensional differences. Verify the specific package variant is compatible with your PCB footprint before finalizing the substitution. Consult package datasheets for precise dimensional specifications.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. BD137G, BD13716STU, BD787G, 2N5191G, BD135G, BD135TG, and BD13516STU all carry ROHS3 compliance certification. This ensures compatibility with RoHS-regulated applications and supply chains.

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