Equivalent & Substitute Parts for 2SC24970Q

Part Overview

The 2SC24970Q is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 50V collector-emitter breakdown voltage and 1.5A maximum collector current. This device is packaged in a TO-126B-A1 through-hole configuration and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	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 2SC24970Q is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector-emitter breakdown voltage must be equal to or greater than 50V
Maximum collector current must be equal to or greater than 1.5A
Maximum power dissipation must be equal to or greater than 1.2W
Operating temperature range must accommodate the required 150°C maximum junction temperature

Mechanical Compatibility Criteria:

Mounting type must be through-hole
Package must be compatible with TO-126-3 footprint

The substitute parts BD135G and BD135TG are both manufactured by onsemi and share the same NPN transistor type and through-hole TO-126 package configuration. However, both substitute parts have a collector-emitter breakdown voltage rating of 45V, which is lower than the 2SC24970Q specification of 50V. This represents a voltage derating and must be evaluated against the specific application requirements.

Parameter Comparison

Parameter	2SC24970Q (Panasonic)	BD135G (onsemi)	BD135TG (onsemi)
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50V	45V	45V
Current - Collector (Ic) (Max)	1.5A	1.5A	1.5A
Power - Max	1.2W	1.25W	1.25W
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3
Current - Collector Cutoff (Max)	100µA	100nA	100nA

Engineering Selection Recommendations

BD135G Selection Criteria: BD135G is an active product manufactured by onsemi with ROHS3 compliance and REACH unaffected status. This part is suitable for applications where the 45V collector-emitter breakdown voltage rating is sufficient for the circuit design. The BD135G offers superior leakage current performance (100nA versus 100µA) and is available in bulk packaging with 2369 units in stock.

BD135TG Selection Criteria: BD135TG is classified as Last Time Buy by onsemi and carries the same electrical specifications as BD135G. This part is supplied in tube packaging and has 1451 units in stock. The Last Time Buy status indicates limited future availability and should be considered only when bulk packaging is not suitable or when existing inventory commitments require this specific packaging format.

Voltage Derating Consideration: Both substitute parts operate at 45V maximum collector-emitter breakdown voltage compared to the 2SC24970Q specification of 50V. Applications operating at or near the 50V specification limit require circuit redesign or component selection from alternative sources that maintain the 50V rating.

Frequently Asked Questions (FAQ)

Q: Can BD135G or BD135TG directly replace 2SC24970Q in all applications?

A: Direct replacement is limited by the collector-emitter breakdown voltage specification. The 2SC24970Q is rated for 50V, while both BD135G and BD135TG are rated for 45V. Applications operating below 45V can use these substitutes. Applications requiring the full 50V rating require alternative component selection.

Q: What is the difference between BD135G and BD135TG?

A: BD135G and BD135TG are electrically identical. The primary difference is packaging: BD135G is supplied in bulk format, while BD135TG is supplied in tube format. BD135G is an active product with ongoing availability, while BD135TG is Last Time Buy with limited future supply.

Q: Are the TO-126 packages of BD135G and BD135TG compatible with the TO-126B-A1 footprint of 2SC24970Q?

A: Yes. Both substitute parts use the TO-225AA and TO-126-3 package designations, which are compatible with the through-hole TO-126-3 footprint. Physical board layout compatibility is maintained.

Q: What is the significance of the lower collector cutoff current in BD135G and BD135TG?

A: The substitute parts have collector cutoff current (ICBO) of 100nA compared to 100µA in the 2SC24970Q. This represents superior leakage performance and is advantageous for low-power standby applications and precision circuits.

Q: Should BD135G be preferred over BD135TG for new designs?

A: BD135G is recommended for new designs due to its active product status and unrestricted future availability. BD135TG is Last Time Buy and should be reserved for applications where existing inventory or specific tube packaging requirements mandate its use.

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