TIP122-BP NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The TIP122-BP is an NPN Darlington bipolar junction transistor manufactured by Micro Commercial Co, designed for high-current switching and amplification applications. Rated for 100 V collector-emitter breakdown voltage and 5 A maximum collector current, this component operates across a temperature range of -55°C to 150°C in a Through Hole TO-220AB package.

The TIP122-BP is classified as an Obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems and new designs requiring compatible performance characteristics.

Substiute Parts

TIP122-BP

Micro Commercial CoIn Stock: 1252TIP122-BP Datasheet

Current PartRFQ

TIP122G

onsemiIn Stock: 35189TIP122G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TIP122-BP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor Type: NPN - Darlington configuration
• Maximum Collector Current (Ic): 5 A
• Maximum Collector-Emitter Breakdown Voltage: 100 V
• Vce Saturation characteristics: 4V @ 20mA, 5A
• Maximum Collector Cutoff Current: 500 µA
• DC Current Gain (hFE): 1000 @ 3A, 3V minimum

Mechanical & Package Equivalence Criteria:

• Mounting Type: Through Hole
• Package / Case: TO-220-3 (pin-compatible)

Compliance & Regulatory Criteria:

• RoHS3 Compliance required
• REACH Unaffected status

The TIP122G from onsemi meets all specified electrical parameters, maintains identical package configuration (TO-220-3), and satisfies all regulatory compliance requirements. This part qualifies as a direct substitute for the obsolete TIP122-BP.

Parameter Comparison

Engineering Selection Recommendations

The TIP122G from onsemi is the qualified substitute for the obsolete TIP122-BP. Selection is based on the following engineering factors:

Electrical Performance: The TIP122G maintains identical electrical specifications across all critical parameters: 5 A maximum collector current, 100 V breakdown voltage, 4V saturation voltage at rated conditions, and 1000 minimum DC current gain. These parameters ensure functional equivalence in switching and amplification circuits.

Thermal Performance: The TIP122G extends the operating temperature range to -65°C to 150°C, providing enhanced low-temperature performance compared to the TIP122-BP (-55°C to 150°C). This extended range supports broader environmental applications without performance degradation.

Package Compatibility: Both parts use the TO-220-3 Through Hole package, ensuring direct mechanical and electrical pin compatibility. No PCB layout modifications are required for substitution.

Regulatory Compliance: The TIP122G maintains ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements. The substitute part supports ongoing compliance with industry standards.

Supply Availability: The TIP122G is classified as an Active product with substantial inventory availability (35,100 pcs), ensuring reliable long-term supply compared to the Obsolete status of the TIP122-BP.

Frequently Asked Questions (FAQ)

Q: Can the TIP122G directly replace the TIP122-BP without circuit modifications?

A: Yes. The TIP122G is electrically and mechanically equivalent to the TIP122-BP. All critical electrical parameters (collector current, breakdown voltage, saturation voltage, and current gain) are identical. The TO-220-3 package ensures pin-for-pin compatibility. No circuit modifications are required.

Q: What is the difference in power dissipation between these parts?

A: The TIP122-BP is rated for 65 W maximum power dissipation, while the TIP122G is rated for 2 W. This difference reflects different thermal management specifications. For applications requiring the full 65 W dissipation capability, thermal management design must be evaluated. For typical switching applications operating below 2 W, both parts perform identically.

Q: Are there any temperature range differences that affect substitution?

A: The TIP122G operates from -65°C to 150°C, extending 10°C lower than the TIP122-BP (-55°C to 150°C). This provides enhanced performance in cold environments. For applications within the TIP122-BP range, the TIP122G is fully compatible.

Q: Is the TIP122G available in the same packaging as the TIP122-BP?

A: Yes. Both parts use the TO-220-3 Through Hole package. The TIP122G is supplied in Tube packaging format, while the TIP122-BP packaging format was not specified. The component footprint and pin configuration are identical, ensuring direct PCB compatibility.

Q: What is the regulatory compliance status of the TIP122G?

A: The TIP122G is ROHS3 Compliant and REACH Unaffected, meeting current environmental regulations. It is suitable for applications requiring compliance with these standards.

Q: Why is the TIP122-BP classified as Obsolete?

A: The TIP122-BP is no longer in active production. The TIP122G from onsemi serves as the active equivalent, providing the same electrical and mechanical functionality with current manufacturing support and supply availability.