CJD122 TR13 Equivalent & Substitute Parts

Part Overview

The CJD122 TR13 is an NPN Darlington bipolar junction transistor manufactured by Central Semiconductor Corp, designed for surface mount applications in the TO-252-3 DPAK package. This component is rated for 100 V collector-emitter breakdown voltage with a maximum collector current of 8 A and maximum power dissipation of 1.75 W. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

CJD122 TR13

Central Semiconductor CorpIn Stock: 801CJD122 TR13 Datasheet

Current PartRFQ

MJD122T4

STMicroelectronicsIn Stock: 6992MJD122T4 Datasheet

DirectRFQ

MJD122T4G

onsemiIn Stock: 65203MJD122T4G Datasheet

Parametric EquivalentRFQ

NJVMJD122T4G

onsemiIn Stock: 20437NJVMJD122T4G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CJD122 TR13 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Transistor Type: NPN - Darlington configuration
• Current - Collector (Ic) Max: 8 A
• Voltage - Collector Emitter Breakdown (Max): 100 V
• Vce Saturation (Max) @ Ib, Ic: 4 V @ 80 mA, 8 A
• Current - Collector Cutoff (Max): 10 µA
• DC Current Gain (hFE) Min @ Ic, Vce: 1000 @ 4 A, 4 V
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Power - Max: Substitute parts may exceed the original 1.75 W rating
• Frequency - Transition: Substitute parts may differ if not specified
• Operating Temperature Range: Substitute parts must support the required operating window

The substitute parts identified below meet all mandatory matching parameters and are therefore electrically and mechanically compatible with the CJD122 TR13 in equivalent circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MJD122T4G (onsemi)

The MJD122T4G is the preferred parametric equivalent for the obsolete CJD122 TR13. This part maintains identical electrical specifications across all critical parameters including collector current, breakdown voltage, saturation voltage, current gain, and transition frequency. The MJD122T4G is in active production status with high inventory availability (65,100 pcs), ensuring long-term supply continuity. The component carries ROHS3 compliance and MSL 1 rating, matching the original part's environmental qualifications.

Secondary Substitute: NJVMJD122T4G (onsemi)

The NJVMJD122T4G provides an alternative with identical electrical performance to the CJD122 TR13 and includes automotive-grade qualification (AEC-Q101). This variant is suitable for applications requiring automotive-level reliability and traceability. The part is supplied in Tape & Reel packaging, matching the original CJD122 TR13 format. Inventory availability is 20,400 pcs.

Alternative Substitute: MJD122T4 (STMicroelectronics)

The MJD122T4 meets all mandatory electrical parameters but differs in two aspects: maximum power dissipation is rated at 20 W (versus 1.75 W for the original), and transition frequency is not specified. This part is suitable for applications where thermal margin is beneficial. The MJD122T4 is in active production with 6,960 pcs available inventory. Packaging is supplied as Cut Tape and Digi-Reel options.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols. The NJVMJD122T4G additionally provides AEC-Q101 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the MJD122T4 be used as a direct replacement for the CJD122 TR13?

A: Yes. The MJD122T4 meets all mandatory electrical parameters: 8 A collector current, 100 V breakdown voltage, 4 V saturation voltage at specified conditions, 10 µA cutoff current, and 1000 hFE minimum gain. The higher power rating (20 W versus 1.75 W) provides additional thermal margin and does not compromise circuit compatibility. The primary consideration is packaging format: MJD122T4 is supplied in Cut Tape and Digi-Reel options, while the original CJD122 TR13 uses Tape & Reel.

Q: What is the difference between MJD122T4G and NJVMJD122T4G?

A: Both parts are manufactured by onsemi and share identical electrical specifications. The key difference is automotive qualification: NJVMJD122T4G carries AEC-Q101 certification, making it suitable for automotive applications requiring formal qualification. Additionally, NJVMJD122T4G is supplied in Tape & Reel packaging, while MJD122T4G uses Cut Tape and Digi-Reel formats. For non-automotive applications, either part is electrically equivalent.

Q: Are there any temperature range differences between the substitutes?

A: The MJD122T4 specifies a maximum operating temperature of 150 °C (TJ) without a minimum temperature specification. The CJD122 TR13, MJD122T4G, and NJVMJD122T4G all specify the full range of -65 to 150 °C (TJ). For applications requiring operation below 0 °C, use MJD122T4G or NJVMJD122T4G to ensure specified performance across the full temperature range.

Q: Is the DPAK package identical across all substitute parts?

A: Yes. All substitute parts use the TO-252-3 DPAK package (2 Leads + Tab), SC-63 designation. This ensures mechanical and thermal compatibility with existing PCB layouts and thermal management designs. No package-related modifications are required when substituting any of these parts.

Q: What is the significance of the transition frequency specification?

A: The CJD122 TR13 specifies 4 MHz transition frequency, indicating the frequency at which current gain begins to degrade. MJD122T4G and NJVMJD122T4G maintain this 4 MHz specification. The MJD122T4 does not specify transition frequency; however, this does not indicate incompatibility for DC or low-frequency switching applications. For high-frequency switching circuits where transition frequency is critical, use MJD122T4G or NJVMJD122T4G.

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

A: MJD122T4G (onsemi) offers the highest inventory level at 65,100 pcs and is in active production status, providing the strongest assurance of long-term availability. NJVMJD122T4G (onsemi, automotive-qualified) has 20,400 pcs available. MJD122T4 (STMicroelectronics) has 6,960 pcs available. All three parts are in active production and suitable for long-term design support.