CPH6121-TL-E Equivalent & Substitute Parts

Part Overview

The CPH6121-TL-E is a Surface Mount PNP Bipolar Junction Transistor manufactured by onsemi, rated for 12 V collector-emitter breakdown voltage and 3 A maximum collector current. This device is classified as "Not For New Designs" and operates at a maximum junction temperature of 150°C with 1.3 W power dissipation capability.

Due to its "Not For New Designs" status, identifying equivalent substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this transistor is currently deployed. The CPH6121-TL-E remains available in inventory but alternative parts with active product status may be required for new procurement cycles.

Substiute Parts

CPH6121-TL-E

onsemiIn Stock: 3453CPH6121-TL-E Datasheet

Current PartRFQ

CPH6122-TL-E

onsemiIn Stock: 1949CPH6122-TL-E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CPH6121-TL-E is determined by the following critical parameters:

Mandatory Matching Criteria:

• Transistor Type: PNP
• Current - Collector (Ic) Max: 3 A (minimum requirement)
• Power - Max: 1.3 W (minimum requirement)
• Mounting Type: Surface Mount
• DC Current Gain (hFE) Min: 200 @ 500mA, 2V (minimum requirement)
• Operating Temperature: 150°C (TJ) (minimum requirement)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variation Parameters:

• Voltage - Collector Emitter Breakdown (Max): May exceed 12 V (higher voltage rating is acceptable for backward compatibility)
• Frequency - Transition: May exceed 380 MHz (higher frequency capability is acceptable)
• Vce Saturation: May vary within acceptable operating margins
• Current - Collector Cutoff (Max): May vary within acceptable leakage specifications
• Package / Case: May differ if pin configuration and footprint remain compatible with Surface Mount assembly

The CPH6122-TL-E qualifies as a direct substitute because it maintains all mandatory matching criteria while providing enhanced voltage rating (30 V vs. 12 V) and improved frequency performance (400 MHz vs. 380 MHz).

Parameter Comparison

Engineering Selection Recommendations

CPH6122-TL-E as Primary Substitute:

The CPH6122-TL-E is the direct equivalent for the CPH6121-TL-E. Selection of this substitute is supported by the following factors:

1. Product Status: The CPH6122-TL-E carries Active product status, whereas the CPH6121-TL-E is designated "Not For New Designs." This distinction makes the CPH6122-TL-E the preferred choice for ongoing procurement and production continuity.

2. Electrical Compatibility: All mandatory electrical parameters match or exceed the CPH6121-TL-E specifications. The enhanced voltage rating (30 V vs. 12 V) and transition frequency (400 MHz vs. 380 MHz) provide additional design margin without compromising performance in applications originally specified for the CPH6121-TL-E.

3. Regulatory Compliance: Both parts maintain identical RoHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited) classification, ensuring no additional supply chain or assembly process modifications are required.

4. Mechanical Compatibility: Both devices are Surface Mount components with identical power dissipation ratings and operating temperature limits, supporting direct substitution in existing PCB layouts and thermal management designs.

Frequently Asked Questions (FAQ)

Q: Can the CPH6122-TL-E replace the CPH6121-TL-E in existing designs?

A: Yes. The CPH6122-TL-E meets or exceeds all mandatory electrical and mechanical parameters of the CPH6121-TL-E. The higher voltage rating (30 V vs. 12 V) and improved frequency response (400 MHz vs. 380 MHz) provide enhanced performance margins. No circuit modifications are required for direct substitution in applications originally designed for the CPH6121-TL-E.

Q: What is the significance of the "Not For New Designs" status on the CPH6121-TL-E?

A: This designation indicates that onsemi has discontinued active development and promotion of the CPH6121-TL-E for new applications. Existing inventory remains available for production support and maintenance, but the CPH6122-TL-E is the recommended alternative for new procurement cycles and design initiatives.

Q: Are there package differences between these parts?

A: Both parts are Surface Mount devices. The CPH6121-TL-E is specified as SC-74 or SOT-457 package, while the CPH6122-TL-E is specified as SOT-23-6 Thin or TSOT-23-6 package. Pin configuration compatibility must be verified against the specific PCB layout and assembly requirements before substitution.

Q: Do these parts require different handling or storage procedures?

A: No. Both parts carry identical Moisture Sensitivity Level 1 (Unlimited) classification, indicating no special moisture control measures are required during storage or handling. Standard ESD precautions for Surface Mount components apply to both devices.

Q: What are the key electrical differences between these transistors?

A: The primary differences are voltage rating and frequency response. The CPH6122-TL-E supports 30 V collector-emitter breakdown voltage compared to 12 V for the CPH6121-TL-E, and provides 400 MHz transition frequency versus 380 MHz. All other critical parameters, including collector current (3 A), power dissipation (1.3 W), and DC current gain (200 @ 500mA, 2V), are identical.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the CPH6121-TL-E and CPH6122-TL-E are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and distribution.