2SC24970R Equivalent & Substitute Parts

Part Overview

The 2SC24970R is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 50 V collector-emitter breakdown voltage and 1.5 A maximum collector current. This device is packaged in the TO-126B-A1 through-hole configuration and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for production and repair applications.

Key Parameters

Parameter	Value
Transistor Type	NPN
Current - Collector (Ic) (Max)	1.5 A
Voltage - Collector Emitter Breakdown (Max)	50 V
Power - Max	1.2 W
Mounting Type	Through Hole
Package / Case	TO-225AA, TO-126-3
Operating Temperature (Max)	150°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 2SC24970R is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

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

Mechanical Compatibility Criteria:

Mounting type must be through-hole
Package must be compatible with TO-126-3 or TO-225AA footprints

All substitute parts listed meet or exceed these parameters. The BD135 series devices from onsemi (BD135G, BD135TG, BD13510STU, BD13516S, BD13516STU) satisfy the electrical requirements with collector-emitter breakdown voltage of 45 V and maximum collector current of 1.5 A. While the BD135 series operates at 45 V maximum breakdown voltage compared to the 2SC24970R's 50 V rating, these devices remain functionally compatible for applications where the actual operating voltage does not exceed 45 V.

Parameter Comparison

Parameter	2SC24970R	BD135G	BD135TG	BD13510STU	BD13516S	BD13516STU
Manufacturer	Panasonic	onsemi	onsemi	onsemi	onsemi	onsemi
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Current - Collector (Ic) (Max)	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A
Voltage - Collector Emitter Breakdown (Max)	50 V	45 V	45 V	45 V	45 V	45 V
Power - Max	1.2 W	1.25 W	1.25 W	1.25 W	1.25 W	1.25 W
Mounting Type	Through Hole	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	TO-225AA, TO-126-3
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Product Status	Obsolete	Active	Last Time Buy	Active	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BD13516STU

The BD13516STU is the preferred substitute for the 2SC24970R. This device carries Active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The BD13516STU is supplied in tube packaging and maintains full electrical compatibility with the 2SC24970R across all critical parameters.

Secondary Recommendation: BD13510STU

The BD13510STU provides an alternative with Active product status. This device is also ROHS3 compliant and REACH unaffected. It is supplied in tube packaging and meets all electrical requirements for substitution.

Tertiary Recommendations: BD135G and BD135TG

Both BD135G and BD135TG are functionally compatible substitutes. BD135G carries Active status with bulk packaging, while BD135TG is designated Last Time Buy with tube packaging. Both are ROHS3 compliant and REACH unaffected. Selection between these options depends on packaging requirements and supply continuity considerations.

Not Recommended: BD13516S

While BD13516S meets electrical requirements, it carries Last Time Buy status, indicating limited future availability. This designation makes it unsuitable for new designs or long-term production applications.

Frequently Asked Questions (FAQ)

Q: Can the BD135 series devices directly replace the 2SC24970R in all applications?

A: The BD135 series devices are electrically compatible with the 2SC24970R for applications where the actual operating collector-emitter voltage does not exceed 45 V. The 2SC24970R is rated for 50 V maximum breakdown voltage, while BD135 series devices are rated for 45 V. Circuit design review is necessary to confirm that operating voltages remain within the 45 V specification of the substitute device.

Q: What is the difference between the various BD135 packaging options?

A: BD135G is supplied in bulk packaging, while BD135TG and BD13516STU are supplied in tube packaging. BD13510STU is also supplied in tube packaging. Packaging selection depends on assembly process requirements and inventory management practices. All variants maintain identical electrical specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (BD135G, BD135TG, BD13510STU, BD13516S, BD13516STU) are ROHS3 compliant. The original 2SC24970R does not specify RoHS status.

Q: Which substitute part has the longest supply availability?

A: BD13516STU and BD13510STU both carry Active product status, indicating ongoing production and the longest supply availability. BD135G also carries Active status. BD135TG and BD13516S are designated Last Time Buy, indicating limited future availability.

Q: Are the TO-126-3 and TO-126B-A1 packages mechanically compatible?

A: Yes. Both the original 2SC24970R and all substitute parts are compatible with TO-225AA and TO-126-3 footprints. The TO-126B-A1 supplier package designation for the 2SC24970R and the TO-126 or TO-126-3 designations for substitute parts refer to the same physical package family used in through-hole PCB applications.

Q: What is the DC current gain difference between the 2SC24970R and BD135 series devices?

A: The 2SC24970R specifies DC current gain (hFE) of 120 minimum at 1 A collector current and 5 V collector-emitter voltage. The BD135 series devices specify hFE of 40 to 100 minimum at 150 mA collector current and 2 V collector-emitter voltage. These measurements are taken at different operating points, making direct comparison inappropriate. Circuit design must account for the actual hFE characteristics at the intended operating point.

Q: Can substitute parts be used in existing PCB designs without modification?

A: Yes. All substitute parts maintain the same through-hole TO-126-3 package footprint as the 2SC24970R. No PCB layout modifications are required. However, circuit performance parameters such as gain and saturation voltage may differ slightly due to manufacturing variations within the specified ranges.

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