BC557CZL1 Equivalent & Substitute Parts

Part Overview

The BC557CZL1 is a PNP bipolar junction transistor manufactured by onsemi, rated for 45V collector-emitter breakdown voltage and 100mA maximum collector current. This device is packaged in a Through Hole TO-92 (TO-226-3) configuration and is designed for general-purpose switching and amplification applications. The BC557CZL1 is classified as an obsolete product, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage ratings, current ratings, and thermal characteristics while meeting current manufacturing and compliance standards.

Substiute Parts

BC557CZL1

onsemiIn Stock: 1059BC557CZL1 Datasheet

Current PartRFQ

BC557BTA

onsemiIn Stock: 6210BC557BTA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC557CZL1 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Transistor type must be PNP
• Maximum collector current (Ic) must be equal to or greater than 100mA
• Collector-emitter breakdown voltage (VCEO) must be equal to or greater than 45V
• Vce saturation characteristics must be compatible at specified bias conditions
• DC current gain (hFE) must meet or exceed minimum specifications

Mechanical Compatibility Criteria:

• Mounting type must be Through Hole
• Package must be TO-92-3 or equivalent TO-226-3 configuration
• Lead formation must be compatible with standard PCB layouts

Compliance Criteria:

• Substitute parts must be active products or have documented end-of-life status
• RoHS and REACH compliance status must be documented

The BC557BTA meets all electrical and mechanical substitution criteria while offering improved compliance status and active product availability.

Parameter Comparison

Engineering Selection Recommendations

BC557BTA as Primary Substitute:

The BC557BTA is the direct substitute for the BC557CZL1. Both devices share the same base product number (BC557) and are manufactured by onsemi. The BC557BTA maintains electrical equivalence across all critical parameters: 100mA collector current, 45V breakdown voltage, and identical saturation characteristics.

The BC557BTA offers significant advantages for new designs and production transitions:

1. Product Status: BC557BTA is an active product with documented manufacturing availability, whereas BC557CZL1 is obsolete.

2. Compliance: BC557BTA is ROHS3 compliant, addressing regulatory requirements for new applications. BC557CZL1 is RoHS non-compliant.

3. Packaging: BC557BTA is supplied in Cut Tape (CT) packaging, suitable for automated assembly processes. Both devices use identical TO-92-3 Through Hole package configuration.

4. Electrical Performance: BC557BTA specifications are conservative relative to BC557CZL1 across secondary parameters (lower hFE, lower power dissipation, lower transition frequency). These differences do not affect substitution validity for general-purpose switching and amplification applications where the BC557CZL1 was specified.

5. Inventory: BC557BTA has 6200 units in stock compared to 1009 units for BC557CZL1, ensuring supply continuity.

For applications requiring the specific performance characteristics of BC557CZL1 (higher transition frequency, higher power dissipation capability, or higher DC current gain), design verification is necessary before substitution.

Frequently Asked Questions (FAQ)

Q: Can BC557BTA directly replace BC557CZL1 in existing designs?

A: Yes. BC557BTA meets all critical electrical parameters: PNP type, 100mA collector current, 45V breakdown voltage, and identical saturation characteristics. Both devices use the same TO-92-3 Through Hole package. Pin configuration is identical.

Q: What are the differences between BC557CZL1 and BC557BTA?

A: The primary differences are product status and compliance. BC557CZL1 is obsolete and RoHS non-compliant. BC557BTA is an active product and ROHS3 compliant. Secondary electrical differences include lower DC current gain (200 vs 420), lower transition frequency (150MHz vs 320MHz), and lower maximum power dissipation (500mW vs 625mW) in BC557BTA. These differences do not prevent substitution for standard switching and amplification applications.

Q: Are there any package compatibility issues between BC557CZL1 and BC557BTA?

A: No. Both devices are packaged in TO-92-3 (TO-226-3) Through Hole configuration with formed leads. Pin assignments are identical. PCB layouts designed for BC557CZL1 accept BC557BTA without modification.

Q: What is the operating temperature range for BC557BTA?

A: BC557BTA is rated for a maximum junction temperature of 150°C. BC557CZL1 specifies -55°C to 150°C. For applications requiring operation below ambient temperature or extended low-temperature performance, verify BC557BTA specifications against design requirements.

Q: Is BC557BTA suitable for high-frequency applications?

A: BC557BTA has a transition frequency of 150MHz, compared to 320MHz for BC557CZL1. For applications operating above 150MHz, verify that BC557BTA transition frequency meets circuit requirements. For standard audio-frequency and low-frequency switching applications, BC557BTA is suitable.

Q: What is the difference between Cut Tape (CT) and other packaging formats?

A: Cut Tape (CT) packaging is standard for automated pick-and-place assembly. BC557BTA is supplied in Cut Tape format, suitable for high-volume production. BC557CZL1 packaging format is not specified in available data. Both devices are Through Hole components requiring manual or specialized insertion equipment.

Q: Are there any moisture sensitivity concerns with BC557BTA?

A: BC557BTA has Moisture Sensitivity Level (MSL) listed as Not Applicable, indicating no moisture sensitivity classification. BC557CZL1 is classified as MSL 1 (Unlimited), indicating no moisture sensitivity. Both devices can be stored and handled without moisture control measures.

Q: Can BC557BTA be used in new product designs?

A: Yes. BC557BTA is an active product with full manufacturing support. It is the recommended choice for new designs requiring a PNP transistor with 45V/100mA ratings in TO-92-3 package. ROHS3 compliance makes BC557BTA suitable for applications subject to RoHS regulations.