BAS21WS-TP Equivalent & Substitute Parts

Part Overview

The BAS21WS-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 250 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-323 package. This part is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter ranges for this diode category. Substitution becomes necessary due to inventory availability, manufacturing discontinuation, or supply chain optimization while maintaining circuit functionality and reliability.

Key Parameters

Parameter	BAS21WS-TP Value	Unit
Voltage - DC Reverse (Vr) (Max)	250	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	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Package / Case	SC-76, SOD-323	—
Operating Temperature - Junction	-55 to 155	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the BAS21WS-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Substitute must equal or exceed 250 V
Current - Average Rectified (Io): Substitute must equal or exceed 200 mA
Voltage - Forward (Vf) (Max) @ If: Substitute must not exceed 1.25 V @ 200 mA
Package / Case: Substitute must be SOD-323 (SC-76)
Mounting Type: Surface Mount required
Technology: Standard diode technology

Secondary Compatibility Parameters:

Reverse Recovery Time (trr): 50 ns or faster
Operating Temperature Range: Minimum -55°C to maximum 150°C or higher
RoHS Compliance: ROHS3 Compliant required
Moisture Sensitivity Level: MSL 1 (Unlimited)

Parts are grouped into three categories based on voltage rating alignment:

Group 1 - Full Voltage Match (250 V): Parts meeting or exceeding 250 V reverse voltage specification with 200 mA current rating.

Group 2 - Reduced Voltage (200 V): Parts rated at 200 V reverse voltage with 200 mA or higher current rating. These are suitable for applications where the circuit operates below 200 V.

Group 3 - Lower Voltage (150 V): Parts rated at 150 V reverse voltage. These are suitable only for applications with maximum operating voltages below 150 V.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io mA	Vf (Max) @ If V	trr ns	Package	Temp Range °C	Product Status
BAS21WS-TP	Micro Commercial Co	250	200	1.25 @ 200 mA	50	SOD-323	-55 to 155	Active
BAS21HT1G	onsemi	250	200	1.25 @ 200 mA	50	SOD-323	-55 to 150	Active
NSVBAS21HT3G	onsemi	250	200	1.25 @ 200 mA	50	SOD-323	-55 to 150	Active
BAV21WS-7-F	Diodes Incorporated	200	200	1.25 @ 200 mA	50	SOD-323	-65 to 150	Active
BAS20HT1G	onsemi	200	200	1.25 @ 200 mA	50	SOD-323	-55 to 150	Active
BAS21AHT1G	onsemi	200	200	1.25 @ 200 mA	50	SOD-323	-55 to 150	Active
NSVBAS21AHT1G	onsemi	200	200	1.25 @ 200 mA	50	SOD-323	-55 to 150	Active
BAS321,115	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	SOD-323	—	Active
BAS321,135	Nexperia USA Inc.	200	250	1.25 @ 200 mA	50	SOD-323	—	Active
BAS2103WE6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	SOD-323	—	Last Time Buy
BAV20WS-7-F	Diodes Incorporated	150	200	1.25 @ 200 mA	50	SOD-323	-65 to 150	Active

Engineering Selection Recommendations

Direct Equivalents (Group 1 - 250 V Rating):

BAS21HT1G (onsemi) and NSVBAS21HT3G (onsemi) are direct electrical equivalents to BAS21WS-TP. Both maintain the 250 V reverse voltage specification, 200 mA current rating, and identical forward voltage characteristics. Both are Active product status with ROHS3 compliance. BAS21HT1G is available in Cut Tape & Digi-Reel packaging, while NSVBAS21HT3G is supplied in Tape & Reel format. Selection between these depends on packaging and inventory requirements.

Reduced Voltage Substitutes (Group 2 - 200 V Rating):

BAV21WS-7-F (Diodes Incorporated), BAS20HT1G (onsemi), BAS21AHT1G (onsemi), and NSVBAS21AHT1G (onsemi) are rated at 200 V reverse voltage with 200 mA current capacity. These parts are suitable for applications where the circuit maximum operating voltage does not exceed 200 V. All maintain identical forward voltage and recovery time specifications. All are Active product status with ROHS3 compliance. NSVBAS21AHT1G includes AEC-Q101 automotive qualification.

BAS321,115 and BAS321,135 (Nexperia USA Inc.) are rated at 200 V with enhanced 250 mA current capacity. These provide additional current margin while maintaining voltage compatibility with 200 V applications. Both are Active product status with ROHS3 compliance.

BAS2103WE6327HTSA1 (Infineon Technologies) is rated at 200 V with 250 mA current capacity. This part carries Last Time Buy product status, indicating manufacturing discontinuation. Use only if existing inventory is available and long-term supply is not required.

Lower Voltage Substitute (Group 3 - 150 V Rating):

BAV20WS-7-F (Diodes Incorporated) is rated at 150 V reverse voltage with 200 mA current capacity. This part is suitable only for applications with maximum operating voltages below 150 V. It is Active product status with ROHS3 compliance and offers extended operating temperature range (-65°C to 150°C).

Packaging Considerations:

BAS21WS-TP is supplied in Tape & Reel (TR) format. Equivalent parts in Cut Tape (CT) & Digi-Reel packaging (BAS21HT1G, BAS20HT1G, BAS21AHT1G, BAV21WS-7-F, BAV20WS-7-F) require verification of assembly equipment compatibility. NSVBAS21HT3G and NSVBAS21AHT1G maintain Tape & Reel packaging format.

Frequently Asked Questions (FAQ)

Q: Can BAS21HT1G directly replace BAS21WS-TP?

A: Yes. BAS21HT1G is a direct electrical equivalent with identical voltage (250 V), current (200 mA), forward voltage (1.25 V @ 200 mA), and recovery time (50 ns) specifications. Both are Active product status and ROHS3 compliant. The primary difference is packaging format: BAS21WS-TP uses Tape & Reel while BAS21HT1G uses Cut Tape & Digi-Reel. Verify assembly equipment compatibility before substitution.

Q: What is the difference between 250 V and 200 V rated diodes?

A: The voltage rating indicates the maximum reverse voltage the diode can withstand without breakdown. A 250 V diode (BAS21WS-TP) can operate safely in circuits with reverse voltages up to 250 V. A 200 V diode (BAV21WS-7-F, BAS20HT1G) is limited to 200 V maximum reverse voltage. Substituting a 200 V part into a 250 V application creates risk of diode failure. Substitution is valid only when the circuit maximum reverse voltage does not exceed 200 V.

Q: Can I use BAV20WS-7-F (150 V) in place of BAS21WS-TP (250 V)?

A: No, unless the circuit design guarantees maximum reverse voltage below 150 V. The 150 V rating is a hard limit. Exceeding this voltage causes diode breakdown and circuit failure. BAV20WS-7-F is suitable only for low-voltage applications specifically designed for 150 V operation.

Q: What does "Last Time Buy" product status mean for BAS2103WE6327HTSA1?

A: Last Time Buy indicates the manufacturer has discontinued production and existing inventory represents the final available stock. This part should not be selected for new designs or applications requiring long-term supply. Use only if immediate availability from existing inventory is confirmed and no future replenishment is needed.

Q: Are automotive-qualified parts (NSVBAS21AHT1G) interchangeable with standard parts?

A: NSVBAS21AHT1G carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and testing standards. It is electrically interchangeable with non-qualified equivalents (BAS21AHT1G) for the same voltage and current ratings. Automotive qualification is required only for applications subject to automotive industry standards. Standard parts are acceptable for non-automotive applications.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel packaging formats contain identical diode components with identical electrical specifications. Packaging format affects only handling, storage, and assembly equipment compatibility. Electrical performance is unchanged between packaging formats of the same part number base.

Q: What is the significance of reverse leakage current differences between parts?

A: Reverse leakage current (specified at rated reverse voltage) indicates the small current flowing through the diode in reverse bias condition. Lower leakage current (40 nA in BAS21AHT1G) versus higher leakage (100 nA in BAS21WS-TP) represents better reverse blocking performance. For most applications, both values are negligible. Substitution is valid when leakage current specifications are within acceptable circuit design margins.

Q: Can I substitute a 250 mA rated diode (BAS321,115) for a 200 mA rated diode (BAS21WS-TP)?

A: Yes, when the reverse voltage requirement does not exceed 200 V. BAS321,115 provides higher current capacity (250 mA versus 200 mA) while maintaining identical forward voltage and recovery time. Higher current rating provides additional design margin and is not detrimental to circuit operation. Verify that the 200 V reverse voltage rating is acceptable for the application.

Q: What operating temperature range should I consider for substitution?

A: BAS21WS-TP operates from -55°C to 155°C junction temperature. Most substitute parts operate to -55°C to 150°C, representing a 5°C reduction at the upper limit. This difference is negligible for most applications. BAV21WS-7-F and BAV20WS-7-F extend the lower temperature limit to -65°C, providing enhanced cold-temperature performance if required by the application.

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