BC635_D27Z Equivalent & Substitute Parts

Part Overview

The BC635_D27Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 1 A maximum collector current. This device is packaged in a TO-92-3 through-hole configuration and is designed for general-purpose switching and amplification applications with a maximum power dissipation of 1 W.

The BC635_D27Z is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

BC635_D27Z

onsemiIn Stock: 1097BC635_D27Z Datasheet

Current PartRFQ

2SD2227STPV

Rohm SemiconductorIn Stock: 10532SD2227STPV Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC635_D27Z requires evaluation against the following critical parameters:

Electrical Compatibility Criteria:

• Transistor type must be NPN
• Collector-emitter breakdown voltage must equal or exceed 45 V
• Maximum collector current must equal or exceed 1 A
• Maximum power dissipation must equal or exceed 1 W
• Operating temperature range must support 150°C junction temperature

Mechanical Compatibility Criteria:

• Mounting type must be through-hole
• Package configuration must be compatible with TO-92-3 footprint requirements

The 2SD2227STPV does not meet the electrical substitution criteria for this application. The maximum collector current rating of 150 mA is significantly below the 1 A requirement of the BC635_D27Z. The maximum power dissipation of 300 mW is also insufficient for the 1 W specification. Additionally, the package type (SC-72 SPT) differs from the TO-92-3 configuration, creating mechanical incompatibility.

Parameter Comparison

Engineering Selection Recommendations

Based on the provided electrical and mechanical parameters, the 2SD2227STPV is not suitable as a direct substitute for the BC635_D27Z in applications requiring the full rated specifications of the original component.

The BC635_D27Z is rated for 1 A collector current and 1 W power dissipation. The 2SD2227STPV is rated for only 150 mA collector current and 300 mW power dissipation. This represents a 6.7× reduction in current handling capability and a 3.3× reduction in power dissipation capacity. Applications designed around the BC635_D27Z specifications cannot be reliably served by the 2SD2227STPV without circuit redesign.

Additionally, the package types differ: BC635_D27Z uses TO-92-3 while 2SD2227STPV uses SC-72. This creates mechanical incompatibility with existing PCB layouts and through-hole mounting requirements.

The 2SD2227STPV is classified as active product status, whereas the BC635_D27Z is obsolete. For applications requiring the electrical and mechanical characteristics of the BC635_D27Z, alternative NPN transistors with matching current, voltage, power, and package specifications should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the 2SD2227STPV replace the BC635_D27Z in my circuit?

A: No. The 2SD2227STPV has insufficient current and power ratings. The BC635_D27Z is rated for 1 A collector current and 1 W power dissipation, while the 2SD2227STPV is rated for only 150 mA and 300 mW respectively. Additionally, the package types are incompatible.

Q: What are the primary differences between these two transistors?

A: The BC635_D27Z and 2SD2227STPV differ in three critical areas: collector current rating (1 A vs. 150 mA), power dissipation (1 W vs. 300 mW), and package type (TO-92-3 vs. SC-72). These differences make them unsuitable for direct substitution.

Q: Why is the BC635_D27Z classified as obsolete?

A: The BC635_D27Z is listed as obsolete by the manufacturer. This status indicates that the part is no longer in active production. Applications currently using this component should identify alternative parts with equivalent electrical specifications and compatible packaging.

Q: What parameters must a substitute part match?

A: A suitable substitute for the BC635_D27Z must meet or exceed the following specifications: NPN transistor type, 45 V minimum collector-emitter breakdown voltage, 1 A minimum collector current, 1 W minimum power dissipation, 150°C operating temperature capability, through-hole mounting, and TO-92-3 package compatibility.

Q: Are there any compliance or certification differences between these parts?

A: The BC635_D27Z has REACH Unaffected status and EAR99 ECCN classification. The 2SD2227STPV is RoHS3 compliant and REACH Unaffected. Both parts have Moisture Sensitivity Level 1 (unlimited). Compliance requirements should be verified against specific application and regional standards.