B4S-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The B4S-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 400 V peak reverse voltage and 800 mA average rectified current. This component is classified as obsolete, which necessitates identification of active equivalent parts for continued system design and procurement. The B4S-G operates across a temperature range of -55°C to 150°C and is packaged in the TO-269AA, 4-BESOP surface mount configuration. Locating functionally equivalent alternatives ensures design continuity and supply chain reliability.

Substiute Parts

B4S-G

Comchip TechnologyIn Stock: 3911B4S-G Datasheet

Current PartRFQ

B4S-HF

Comchip TechnologyIn Stock: 837B4S-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B4S-G is determined by strict equivalence across the following critical parameters:

• Diode Type: Single Phase
• Technology: Standard
• Voltage - Peak Reverse (Max): 400 V
• Current - Average Rectified (Io): 800 mA
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 800 mA
• Current - Reverse Leakage @ Vr: 5 µA @ 400 V
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Package / Case: TO-269AA, 4-BESOP
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The B4S-HF meets all these criteria and is manufactured by the same supplier (Comchip Technology) under the same base product number (B4S). The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The B4S-HF is the direct functional equivalent of the B4S-G. Both components share identical electrical specifications, thermal operating range, and package configuration. The B4S-HF holds active product status, ensuring ongoing availability and manufacturer support, whereas the B4S-G is classified as obsolete. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and procurement cycles. The packaging format difference (Cut Tape & Digi-Reel® versus Tape & Reel) reflects supply chain logistics and does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the B4S-HF be used as a direct replacement for the B4S-G in existing designs?

A: Yes. The B4S-HF is electrically and mechanically equivalent to the B4S-G across all specified parameters, including voltage rating, current capacity, forward voltage drop, reverse leakage current, and operating temperature range. Both components use the identical TO-269AA, 4-BESOP package.

Q: What is the difference between Cut Tape & Digi-Reel® and Tape & Reel packaging?

A: Both are surface mount packaging formats suitable for automated assembly. Cut Tape & Digi-Reel® is typically used for smaller order quantities, while Tape & Reel is standard for high-volume production runs. The component itself is identical; only the supply format differs.

Q: Are there compliance differences between the B4S-G and B4S-HF?

A: No. Both parts are ROHS3 compliant and REACH unaffected. Regulatory and environmental compliance status is identical.

Q: Why is the B4S-G classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The B4S-HF, manufactured by the same supplier under the same base product number, represents the active equivalent for ongoing procurement and design use.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Peak reverse voltage (400 V), average rectified current (800 mA), forward voltage drop (1.1 V @ 800 mA), reverse leakage current (5 µA @ 400 V), and operating temperature range (-55°C ~ 150°C) are identical across both parts.