BAS56 BK Equivalent & Substitute Parts

Part Overview

The BAS56 BK is a diode array featuring two independent general-purpose rectifier circuits rated for 60 V DC reverse voltage and 200 mA average rectified current per diode. Manufactured by Central Semiconductor Corp, this component is packaged in a Surface Mount TO-253-4 (SOT-143) configuration.

The BAS56 BK has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array configuration.

Key Parameters

Parameter	Value	Unit
Diode Configuration	2 Independent	—
Voltage - DC Reverse (Vr) (Max)	60	V
Current - Average Rectified (Io) per Diode	200	mA (DC)
Voltage - Forward (Vf) (Max) @ If	1	V @ 200 mA
Reverse Recovery Time (trr)	6	ns
Current - Reverse Leakage @ Vr	100	nA @ 60 V
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-253-4, TO-253AA	—
Supplier Device Package	SOT-143	—
Technology	Standard	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution eligibility for the BAS56 BK is determined by strict electrical and mechanical parameter matching within the diode array category. The following parameters establish the substitution criteria:

Electrical Parameters (Must Match):

Diode Configuration: 2 Independent circuits
Voltage - DC Reverse (Vr) (Max): 60 V minimum
Current - Average Rectified (Io) per Diode: 200 mA (DC) minimum
Voltage - Forward (Vf) (Max) @ If: 1 V @ 200 mA maximum
Reverse Recovery Time (trr): 6 ns maximum
Current - Reverse Leakage @ Vr: 100 nA @ 60 V maximum
Speed Classification: Small Signal ≤ 200mA (Io), Any Speed

Mechanical Parameters (Must Match):

Mounting Type: Surface Mount
Package / Case: TO-253-4, TO-253AA
Supplier Device Package: SOT-143 or compatible variant

Technology:

Technology: Standard

The BAS56,215 manufactured by Nexperia USA Inc. meets all specified electrical and mechanical parameters for direct substitution.

Parameter Comparison

Parameter	BAS56 BK (Central Semiconductor)	BAS56,215 (Nexperia USA Inc.)	Match Status
Diode Configuration	2 Independent	2 Independent	✓ Match
Voltage - DC Reverse (Vr) (Max)	60 V	60 V	✓ Match
Current - Average Rectified (Io) per Diode	200 mA (DC)	200 mA (DC)	✓ Match
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	1 V @ 200 mA	✓ Match
Reverse Recovery Time (trr)	6 ns	6 ns	✓ Match
Current - Reverse Leakage @ Vr	100 nA @ 60 V	100 nA @ 120 V	✓ Compatible
Operating Temperature - Junction	-65°C to 150°C	150°C (Max)	✓ Compatible
Mounting Type	Surface Mount	Surface Mount	✓ Match
Package / Case	TO-253-4, TO-253AA	TO-253-4, TO-253AA	✓ Match
Supplier Device Package	SOT-143	SOT-143B	✓ Compatible
Technology	Standard	Standard	✓ Match
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	✓ Match
Product Status	Obsolete	Active	✓ Improvement

Engineering Selection Recommendations

Primary Substitute: BAS56,215 (Nexperia USA Inc.)

The BAS56,215 is the qualified substitute for the obsolete BAS56 BK. This component maintains electrical and mechanical parameter equivalence across all critical specifications. The BAS56,215 offers the following advantages:

Product Status: Active manufacturing status ensures ongoing availability and supply chain continuity.
Compliance Certifications: AEC-Q100 qualified for automotive applications; ROHS3 compliant; REACH unaffected.
Packaging: Available in Tape & Reel (TR) format, supporting automated assembly processes.
Reverse Leakage Performance: Specified at 100 nA @ 120 V, demonstrating equivalent or superior leakage characteristics compared to the original specification at 60 V.

The BAS56,215 is suitable for direct replacement in existing designs without circuit modification or re-qualification when the original BAS56 BK reaches end-of-life.

Frequently Asked Questions (FAQ)

Q: Can the BAS56,215 be used as a direct replacement for the BAS56 BK?

A: Yes. The BAS56,215 meets all electrical and mechanical parameters specified for the BAS56 BK. Both components feature identical diode configuration (2 independent), voltage ratings (60 V DC reverse), current ratings (200 mA per diode), forward voltage characteristics (1 V @ 200 mA), and recovery time (6 ns). Package compatibility is confirmed for TO-253-4 and TO-253AA footprints.

Q: What is the difference between SOT-143 and SOT-143B packaging?

A: SOT-143 and SOT-143B are compatible package variants within the TO-253 family. Both maintain identical pin configuration, footprint dimensions, and mechanical interface for Surface Mount assembly. The BAS56,215 supplied in SOT-143B packaging is functionally equivalent for PCB placement and soldering operations.

Q: Why is the BAS56 BK listed as obsolete?

A: Obsolete status indicates that the original manufacturer (Central Semiconductor Corp) has discontinued production. The BAS56,215 from Nexperia USA Inc. represents the active equivalent, ensuring continued component availability for new production and field service applications.

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

A: The BAS56,215 includes AEC-Q100 automotive qualification and ROHS3 compliance certifications. These certifications apply to the Nexperia product and may exceed the original BAS56 BK specifications. Verify compliance requirements for your specific application before selection.

Q: What is the reverse leakage specification difference?

A: The BAS56 BK specifies 100 nA @ 60 V reverse leakage. The BAS56,215 specifies 100 nA @ 120 V. The higher voltage specification for the substitute indicates equivalent or superior leakage performance at the original operating voltage, confirming compatibility.

Q: Can the BAS56,215 be used in automotive applications?

A: The BAS56,215 carries AEC-Q100 qualification, confirming suitability for automotive applications. Verify that your specific application requirements align with this qualification level.

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