BAS21HT1 Equivalent & Substitute Parts

Part Overview

The BAS21HT1 is a general-purpose switching diode manufactured by onsemi, rated for 250 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The availability of functionally compatible alternatives ensures design continuity and supply chain flexibility.

Substiute Parts

BAS21HT1

onsemiIn Stock: 2101BAS21HT1 Datasheet

Current PartRFQ

BAS21HT1G

onsemiIn Stock: 7965247BAS21HT1G Datasheet

DirectRFQ

GSD2004WS-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 25870GSD2004WS-E3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BAS21HT1 is determined by electrical and mechanical parameter compatibility within the diode rectifier category. The primary substitution criteria are:

Direct Equivalent Criteria:

• Voltage - DC Reverse (Vr) rating of 250 V or higher
• Current - Average Rectified (Io) rating of 200 mA or higher
• Forward voltage (Vf) characteristics compatible with circuit operation
• Reverse recovery time (trr) of 50 ns or faster
• SOD-323 package compatibility for surface mount assembly
• Reverse leakage current performance at rated voltage

Similar Substitute Criteria:

• Voltage - DC Reverse (Vr) rating within acceptable circuit margin (240 V minimum)
• Current - Average Rectified (Io) rating of 225 mA or higher
• Reverse recovery time (trr) of 50 ns or faster
• SOD-323 package compatibility
• Reverse leakage current performance at rated voltage

Parts meeting these criteria are suitable for direct replacement or circuit-specific evaluation based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

BAS21HT1G (Direct Equivalent - Recommended Primary Choice)

The BAS21HT1G is the direct equivalent replacement for the obsolete BAS21HT1. Both parts share identical electrical specifications: 250 V reverse voltage rating, 200 mA average rectified current, 1.25 V forward voltage at 200 mA, and 50 ns reverse recovery time. The BAS21HT1G maintains active product status with significantly higher inventory availability (7,965,200 pieces). The part achieves ROHS3 compliance, addressing regulatory requirements for new designs. Packaging is identical (SOD-323 surface mount), ensuring mechanical compatibility without PCB redesign. This substitution requires no circuit evaluation and is suitable for direct replacement in all applications.

GSD2004WS-E3-08 (Similar Substitute - Secondary Option)

The GSD2004WS-E3-08 from Vishay General Semiconductor - Diodes Division functions as a similar substitute with minor parameter variations. The reverse voltage rating is 240 V (10 V lower than the main part), and the average rectified current is 225 mA (25 mA higher). Forward voltage is 1 V at 100 mA, representing improved performance. Reverse recovery time matches at 50 ns. The part is classified as fast recovery technology, compared to the standard technology of the main part. ROHS3 compliance is achieved. This substitution is suitable for applications where the 240 V reverse voltage rating provides adequate circuit margin and where the higher current capability and improved forward voltage characteristics are beneficial. Circuit-specific evaluation is required to confirm voltage margin adequacy.

Frequently Asked Questions (FAQ)

Q: Can BAS21HT1G be used as a direct replacement for BAS21HT1?

A: Yes. The BAS21HT1G is a direct equivalent with identical electrical specifications (250 V, 200 mA, 1.25 V Vf, 50 ns trr) and identical SOD-323 package. No circuit modifications are required.

Q: What is the primary reason for substituting BAS21HT1?

A: The BAS21HT1 is classified as obsolete. The BAS21HT1G provides an active, in-stock alternative with identical performance characteristics and improved regulatory compliance (ROHS3).

Q: Can GSD2004WS-E3-08 replace BAS21HT1 in all applications?

A: The GSD2004WS-E3-08 is a similar substitute with compatible but not identical specifications. The reverse voltage rating is 240 V versus 250 V. Applications operating at voltages above 240 V require circuit evaluation to confirm adequate voltage margin. The higher current rating (225 mA) and improved forward voltage (1 V @ 100 mA) are compatible with the original design envelope.

Q: Are all substitute parts available in SOD-323 packaging?

A: Yes. Both BAS21HT1G and GSD2004WS-E3-08 are supplied in SC-76, SOD-323 surface mount packages, ensuring mechanical and assembly compatibility with existing PCB designs.

Q: What is the difference between "Small Signal" and "Fast Recovery" speed classifications?

A: BAS21HT1 and BAS21HT1G are classified as Small Signal diodes (≤ 200 mA, any speed). GSD2004WS-E3-08 is classified as Fast Recovery (≤ 500 ns, > 200 mA). Both achieve 50 ns reverse recovery time. The classification reflects the diode's intended application range rather than a performance limitation.

Q: Do all substitute parts meet RoHS compliance requirements?

A: BAS21HT1 is RoHS non-compliant. Both BAS21HT1G and GSD2004WS-E3-08 are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Q: What is the moisture sensitivity level for these diodes?

A: All three parts (BAS21HT1, BAS21HT1G, and GSD2004WS-E3-08) have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

Q: Which substitute part has the highest inventory availability?

A: BAS21HT1G has the highest inventory with 7,965,200 pieces in stock, compared to 25,761 pieces for GSD2004WS-E3-08 and 2,049 pieces for the obsolete BAS21HT1.