BAS21WT-TP Equivalent & Substitute Parts

Part Overview

The BAS21WT-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200V DC reverse voltage and 200mA average rectified current in a surface mount SOT-323 package. This component is classified as Active product status and complies with RoHS3 and REACH requirements. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or application-specific requirements such as automotive qualification or extended temperature ranges.

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 @ 200 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Package / Case	SC-70, SOT-323	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BAS21WT-TP are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalent (Direct Substitution): Parts that match all critical electrical parameters (200V reverse voltage, 200mA current, 1.25V forward voltage, 50ns recovery time) and use identical SOT-323 packaging. These parts satisfy the same circuit requirements without design modification.

Direct Manufacturer Alternative (Cross-Manufacturer Equivalent): Parts from different manufacturers that maintain identical electrical specifications and package form factor, enabling one-to-one replacement with verified compatibility.

Similar Parts (Voltage-Reduced Alternatives): Parts with reduced reverse voltage ratings (150V instead of 200V) but matching current, forward voltage, and package characteristics. These are suitable only for applications where the lower voltage rating is acceptable.

The critical parameters determining substitution eligibility are: Voltage - DC Reverse (Vr) (Max), Current - Average Rectified (Io), Voltage - Forward (Vf) (Max) @ If, Reverse Recovery Time (trr), and Package / Case form factor.

Parameter Comparison

Parameter	BAS21WT-TP (Main)	BAS21WTHE3-TP	BAS21W-7-F	BAS20,215	BAS20,235	BAS21W
Manufacturer	Micro Commercial Co	Micro Commercial Co	Diodes Incorporated	Nexperia USA Inc.	Nexperia USA Inc.	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	150 V	150 V	250 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 100 mA
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 150 V	100 nA @ 150 V	100 nA @ 200 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	SC-70, SOT-323
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	150°C (Max)	150°C (Max)	125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Qualification	—	AEC-Q101	—	—	—	—
Inventory Status	2612 Pcs	5489 Pcs	32200 Pcs	15069 Pcs	10803 Pcs	125100 Pcs

Engineering Selection Recommendations

BAS21WTHE3-TP (Parametric Equivalent with Automotive Qualification): This part is electrically identical to the BAS21WT-TP with matching 200V reverse voltage, 200mA current rating, and SOT-323 package. The addition of AEC-Q101 automotive qualification makes this part suitable for applications requiring automotive-grade components. Both parts are RoHS3 compliant and MSL 1 rated.

BAS21W-7-F (Cross-Manufacturer Direct Equivalent): Manufactured by Diodes Incorporated, this part maintains identical electrical specifications and SOT-323 packaging. The operating temperature range extends to -65°C (versus -55°C for the main part), providing enhanced low-temperature performance. RoHS3 compliance and MSL 1 rating are maintained. High inventory availability (32200 Pcs) supports supply chain flexibility.

BAS21W (Parametric Equivalent with Higher Voltage Rating): Manufactured by Taiwan Semiconductor Corporation, this part provides 250V reverse voltage capability while maintaining 200mA current and SOT-323 packaging. The higher voltage rating offers design margin for applications with voltage transients. However, the maximum junction temperature is limited to 125°C compared to 150°C for the main part. Highest inventory availability (125100 Pcs) among all substitutes.

BAS20,215 and BAS20,235 (Voltage-Reduced Alternatives): Both parts are manufactured by Nexperia USA Inc. with 150V reverse voltage ratings and TO-236AB packaging (different from SOT-323). These parts are suitable only for applications where 150V reverse voltage is sufficient and PCB layout accommodates the TO-236AB form factor. Not recommended for direct replacement without circuit review.

Frequently Asked Questions (FAQ)

Q: Can BAS21WTHE3-TP replace BAS21WT-TP in all applications?

A: Yes. BAS21WTHE3-TP is a parametric equivalent with identical electrical specifications (200V, 200mA, 1.25V forward voltage, 50ns recovery time) and SOT-323 packaging. The addition of AEC-Q101 automotive qualification does not restrict use in non-automotive applications. Both parts are RoHS3 compliant and MSL 1 rated.

Q: What is the difference between BAS21W-7-F and BAS21WT-TP?

A: BAS21W-7-F is manufactured by Diodes Incorporated instead of Micro Commercial Co, but maintains identical electrical specifications and SOT-323 packaging. The operating temperature range extends to -65°C (lower minimum) compared to -55°C for BAS21WT-TP. This provides enhanced performance in cold environments. All other parameters, including 200V reverse voltage and 200mA current, are identical.

Q: Why does BAS21W have a higher voltage rating (250V) than the main part?

A: BAS21W is rated for 250V reverse voltage, providing additional voltage margin. This higher rating does not affect compatibility in circuits designed for 200V operation. However, the maximum junction temperature is limited to 125°C compared to 150°C for BAS21WT-TP, which may be a constraint in high-temperature applications.

Q: Can BAS20,215 or BAS20,235 be used as direct replacements?

A: No. These parts have reduced reverse voltage ratings (150V instead of 200V) and use TO-236AB packaging instead of SOT-323. They are suitable only for applications where the lower voltage rating is acceptable and the PCB layout can accommodate the different package form factor. Circuit review is required before substitution.

Q: What does AEC-Q101 qualification on BAS21WTHE3-TP mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. BAS21WTHE3-TP meets this qualification, making it suitable for automotive applications. However, this qualification does not restrict use in non-automotive circuits and does not change the electrical performance compared to BAS21WT-TP.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (BAS21WTHE3-TP, BAS21W-7-F, BAS20,215, BAS20,235, and BAS21W) are RoHS3 compliant and REACH unaffected, matching the compliance status of BAS21WT-TP.

Q: Which substitute part has the best inventory availability?

A: BAS21W has the highest inventory (125100 Pcs), followed by BAS21W-7-F (32200 Pcs). Both are suitable for applications requiring immediate availability and high-volume supply.

Q: What is the significance of MSL 1 rating?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control requirements. All listed parts, including BAS21WT-TP and its substitutes, carry MSL 1 rating, eliminating moisture-related handling constraints during storage and assembly.

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