BAV21WS-7 Equivalent & Substitute Parts

Part Overview

The BAV21WS-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-323 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical specifications, while substitute parts offer compatible performance within defined parameter tolerances for this diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	nA @ 200 V
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Package / Case	SC-76, SOD-323	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the BAV21WS-7 is determined by the following critical electrical parameters: reverse voltage rating (200 V minimum), average rectified current (200 mA minimum), forward voltage drop (1.25 V maximum at 200 mA), reverse recovery time (50 ns), and reverse leakage current (100 nA at 200 V maximum). All substitute parts must maintain the SOD-323 surface mount package for mechanical compatibility.

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents — Parts with identical electrical specifications and active product status, offering direct replacement capability with improved compliance certifications (RoHS3 compliant).

Category 2: Manufacturer-Recommended Substitutes — Parts with equivalent or superior electrical performance from alternative manufacturers, selected for availability, compliance status, and production continuity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Package	Product Status	RoHS Status
BAV21WS-7	Diodes Incorporated	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Discontinued	Non-compliant
BAV21WS-7-F	Diodes Incorporated	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS20HT1G	onsemi	200	200	1.25 @ 200 mA	50	1000 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS2103WE6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Last Time Buy	ROHS3 Compliant
BAS21AHT1G	onsemi	200	200	1.25 @ 200 mA	50	40 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS21HT1G	onsemi	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS21WS-TP	Micro Commercial Co	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS321,115	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAS321,135	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Active	ROHS3 Compliant
NSVBAS21HT3G	onsemi	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOD-323	Active	ROHS3 Compliant
BAV20WSHE3-TP	Micro Commercial Co	200	200	1.25 @ 200 mA	50	100 @ 150 V	SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement): BAV21WS-7-F from Diodes Incorporated is the direct parametric equivalent with identical electrical specifications. This part maintains the same manufacturer lineage and offers the advantage of active product status with ROHS3 compliance, addressing regulatory requirements for new designs.

Secondary Equivalents (Electrical Compatibility): BAS21AHT1G (onsemi) provides identical voltage and current ratings with superior reverse leakage characteristics (40 nA versus 100 nA), offering enhanced performance in low-leakage applications. BAS20HT1G (onsemi) maintains all critical parameters with higher reverse leakage (1 µA), suitable for applications where leakage is not a limiting factor.

Substitutes with Enhanced Current Rating: BAS2103WE6327HTSA1 (Infineon Technologies), BAS321,115 (Nexperia), and BAS321,135 (Nexperia) support 250 mA average rectified current while maintaining 200 V reverse voltage, providing design margin for current-limited applications. These parts are suitable for designs requiring higher current capacity within the same voltage class.

Substitutes with Enhanced Voltage Rating: BAS21HT1G (onsemi), BAS21WS-TP (Micro Commercial Co), and NSVBAS21HT3G (onsemi) provide 250 V reverse voltage rating while maintaining 200 mA current, offering voltage margin for applications operating near the 200 V limit.

Automotive-Grade Option: BAV20WSHE3-TP (Micro Commercial Co) carries AEC-Q101 automotive qualification and is suitable for automotive and harsh-environment applications requiring enhanced reliability screening.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance for production designs.

Frequently Asked Questions (FAQ)

Q: Can BAV21WS-7-F be used as a direct replacement for BAV21WS-7? A: Yes. BAV21WS-7-F is a parametric equivalent with identical electrical specifications (200 V, 200 mA, 1.25 V forward drop, 50 ns recovery time). The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 compliant). Both parts use the SOD-323 package and are mechanically and electrically interchangeable.

Q: What is the difference between parts rated 200 V and 250 V? A: Parts rated 250 V (BAS21HT1G, BAS21WS-TP, NSVBAS21HT3G) provide higher reverse voltage margin. They are suitable for applications where the supply voltage approaches 200 V or where voltage transients are present. For circuits operating well below 200 V, 200 V-rated parts are sufficient and typically offer lower cost.

Q: Can I use a 250 mA part (BAS321,115, BAS321,135, BAS2103WE6327HTSA1) in place of a 200 mA part? A: Yes. Parts rated for 250 mA average rectified current can be used in applications designed for 200 mA. The higher current rating provides design margin and does not affect circuit operation. Forward voltage drop and reverse voltage characteristics remain identical.

Q: What does "Last Time Buy" status mean for BAS2103WE6327HTSA1? A: Last Time Buy indicates that Infineon Technologies has announced end-of-life for this part. While currently available, production will cease at a specified date. This part is suitable for immediate production needs but should not be selected for new long-term designs. BAV21WS-7-F or other active-status parts are recommended for designs with extended production horizons.

Q: Are all substitute parts available in the same packaging options? A: All listed substitute parts use the SOD-323 surface mount package. Packaging formats (Cut Tape, Tape & Reel, Digi-Reel) vary by manufacturer and supplier. Verify packaging availability with your component distributor based on your assembly process requirements.

Q: What is the significance of reverse leakage current differences (40 nA, 100 nA, 1 µA)? A: Reverse leakage current affects circuit performance in high-impedance applications, precision analog circuits, and low-power designs. BAS21AHT1G (40 nA) offers the lowest leakage, suitable for sensitive applications. BAS20HT1G (1 µA) has higher leakage but remains acceptable for most general-purpose rectification. For standard power supply applications, leakage differences are not significant.

Q: Is BAV20WSHE3-TP suitable for non-automotive applications? A: Yes. BAV20WSHE3-TP carries AEC-Q101 automotive qualification, which indicates enhanced reliability screening and stricter manufacturing controls. This part is suitable for any application requiring high reliability, including industrial, medical, and consumer applications. Automotive qualification does not restrict use to automotive applications.

Q: What is the operating temperature range difference between parts? A: Most substitute parts operate from -55°C to 150°C. The original BAV21WS-7 operates from -65°C to 150°C, providing 10°C lower temperature margin. For applications requiring operation below -55°C, BAV21WS-7-F or BAV20WSHE3-TP (both -65°C minimum) are required. For standard industrial applications (-40°C to 85°C), all parts are suitable.

Q: Can I mix different manufacturers' parts in the same design? A: Yes. All listed parts meet identical or superior electrical specifications and use the same SOD-323 package. Mixing manufacturers is acceptable from an electrical and mechanical standpoint. However, for production consistency and supply chain management, selecting a single primary part with a defined secondary alternative is recommended.

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