BAS20HT1 Equivalent & Substitute Parts

Part Overview

The BAS20HT1 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	1 µA @ 200 V
Capacitance @ Vr, F	5 pF @ 0 V, 1 MHz
Package / Case	SC-76, SOD-323
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Standard

Substitute Part Grouping Explanation

Substitution of the BAS20HT1 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 200 mA minimum
Package / Case: SOD-323 (surface mount)
Mounting Type: Surface Mount

Compatible Substitution Categories:

Direct Equivalents maintain all electrical specifications identical to the BAS20HT1, including reverse voltage, current rating, forward voltage, and reverse recovery time. These parts are pin-compatible and functionally interchangeable without circuit modification.

Parametric Equivalents meet or exceed the mandatory electrical parameters while maintaining SOD-323 packaging. These parts may have improved specifications such as lower reverse leakage current or enhanced temperature ratings, making them suitable for direct substitution.

Upgrade Parts exceed the reverse voltage rating (250 V or higher) while maintaining the 200 mA current rating and SOD-323 package. These provide enhanced voltage margin and are suitable for applications requiring higher voltage headroom.

Similar Parts share the SOD-323 package and general-purpose rectifier function but may have variations in current rating (250 mA), voltage classification, or speed characteristics. These require circuit-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Status	RoHS
BAS20HT1	onsemi	200 V	200 mA	1.25 V @ 200 mA	50 ns	1 µA @ 200 V	SOD-323	Obsolete	Non-compliant
BAS20HT1G	onsemi	200 V	200 mA	1.25 V @ 200 mA	50 ns	1 µA @ 200 V	SOD-323	Active	ROHS3 Compliant
SBAS20HT1G	onsemi	200 V	200 mA	1.25 V @ 200 mA	50 ns	1 µA @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS21WS-TP	Micro Commercial Co	250 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS2103WE6327HTSA1	Infineon Technologies	200 V	250 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOD-323	Last Time Buy	ROHS3 Compliant
BAS321/8F	Nexperia USA Inc.	200 V	250 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOD-323	Obsolete	ROHS3 Compliant
BAV20WS-7-F	Diodes Incorporated	150 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 150 V	SOD-323	Active	ROHS3 Compliant
BAV20WS_R1_00001	Panjit International Inc.	150 V	200 mA	1 V @ 100 mA	50 ns	100 nA @ 150 V	SOD-323	Active	ROHS3 Compliant
BAV21WS-7-F	Diodes Incorporated	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOD-323	Active	ROHS3 Compliant
BAV21WS-E3-08	Vishay General Semiconductor - Diodes Division	200 V	250 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOD-323	Active	ROHS3 Compliant
BAV21WSQ-7-F	Diodes Incorporated	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BAS20HT1G

The BAS20HT1G from onsemi is the direct equivalent replacement for the obsolete BAS20HT1. This part maintains identical electrical specifications across all critical parameters: 200 V reverse voltage, 200 mA current rating, 1.25 V forward voltage at 200 mA, and 50 ns reverse recovery time. The BAS20HT1G is in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Inventory availability is substantial at 125,100 pieces.

Secondary Recommendation: SBAS20HT1G

The SBAS20HT1G from onsemi provides parametric equivalence with identical electrical specifications and adds automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive-level reliability and traceability. Product status is active with ROHS3 compliance. This variant is available in Tape & Reel packaging with 22,796 pieces in stock.

Upgrade Option: BAS21WS-TP

The BAS21WS-TP from Micro Commercial Co offers enhanced voltage rating at 250 V while maintaining 200 mA current capacity and SOD-323 packaging. This part provides 50 V additional voltage margin over the original specification and features improved reverse leakage current (100 nA versus 1 µA). The BAS21WS-TP is active production with ROHS3 compliance and 56,988 pieces available.

Alternative Equivalent: BAV21WS-7-F

The BAV21WS-7-F from Diodes Incorporated matches the BAS20HT1 electrical specifications with 200 V reverse voltage and 200 mA current rating. This part features lower reverse leakage current (100 nA) and is in active production with ROHS3 compliance. Inventory availability is 65,610 pieces.

Alternative Equivalent: BAV21WSQ-7-F

The BAV21WSQ-7-F from Diodes Incorporated provides parametric equivalence with identical 200 V / 200 mA ratings and improved reverse leakage current (100 nA). This part is available in Tape & Reel packaging, active production status, and ROHS3 compliant. Stock availability is 36,300 pieces.

Not Recommended for Direct Substitution:

BAV20WS-7-F and BAV20WS_R1_00001 have reduced reverse voltage rating (150 V), which does not meet the 200 V requirement of the original BAS20HT1 specification. These parts are suitable only for applications with lower voltage requirements.

BAS2103WE6327HTSA1 and BAV21WS-E3-08 have increased current ratings (250 mA) and are classified as Last Time Buy or active status respectively. While electrically compatible, these represent design changes rather than direct substitutions.

BAS321/8F is obsolete and should not be selected for new designs despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can BAS20HT1G be used as a direct replacement for BAS20HT1?

A: Yes. The BAS20HT1G is a direct equivalent with identical electrical specifications: 200 V reverse voltage, 200 mA current rating, 1.25 V forward voltage at 200 mA, and 50 ns reverse recovery time. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). No circuit modifications are required.

Q: What is the difference between BAS20HT1G and SBAS20HT1G?

A: Both parts are parametric equivalents with identical electrical specifications. The SBAS20HT1G includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. The packaging differs: BAS20HT1G is available in Cut Tape & Digi-Reel, while SBAS20HT1G is supplied in Tape & Reel format. Selection depends on application requirements and packaging preferences.

Q: Can BAS21WS-TP replace BAS20HT1 in all applications?

A: BAS21WS-TP is an upgrade option with 250 V reverse voltage rating compared to the 200 V specification of BAS20HT1. This higher voltage rating provides additional design margin and is suitable for applications where increased voltage headroom is beneficial or required. The 200 mA current rating and SOD-323 package remain compatible. Circuit-level evaluation is not required for voltage-limited applications.

Q: Why are BAV20WS-7-F and BAV20WS_R1_00001 not recommended?

A: These parts have a maximum reverse voltage rating of 150 V, which is below the 200 V requirement of the BAS20HT1. While they share the same current rating (200 mA) and package (SOD-323), they cannot be used in circuits designed for 200 V operation. These parts are suitable only for applications with lower voltage specifications.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: The original BAS20HT1 is RoHS non-compliant. All recommended substitutes (BAS20HT1G, SBAS20HT1G, BAS21WS-TP, BAV21WS-7-F, BAV21WSQ-7-F) are ROHS3 compliant. This compliance is mandatory for products sold into regulated markets and is required for new designs. RoHS compliance does not affect electrical performance or circuit compatibility.

Q: Are there packaging differences between substitute parts?

A: Yes. While all recommended substitutes use the SOD-323 package, they are supplied in different formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), or both. Packaging format affects procurement and assembly processes but does not impact electrical performance or circuit compatibility. Select based on manufacturing requirements and inventory management preferences.

Q: Can BAV21WS-E3-08 be used instead of BAS20HT1?

A: BAV21WS-E3-08 has a higher current rating (250 mA versus 200 mA) and is electrically compatible with the BAS20HT1 in terms of voltage (200 V) and package (SOD-323). However, this represents a design change rather than a direct substitution. The part is suitable for applications where increased current capacity is beneficial. No circuit modifications are required for voltage or package compatibility.

Q: What is the difference between small signal and fast recovery diodes in this product category?

A: The BAS20HT1 is classified as a small signal diode with reverse recovery time of 50 ns and current rating of 200 mA. Some substitute options (BAS2103WE6327HTSA1, BAS321/8F, BAV21WS-E3-08) are classified as fast recovery diodes with the same 50 ns reverse recovery time but higher current ratings (250 mA). Both classifications share identical reverse recovery characteristics and are functionally compatible in this application.

Q: Is SBAS20HT1G suitable for automotive applications?

A: Yes. SBAS20HT1G includes AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. This qualification ensures compliance with automotive reliability and testing standards. The part is available in active production status with ROHS3 compliance and is recommended for automotive designs requiring traceability and qualification documentation.

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