BAS21W-7 Equivalent & Substitute Parts

Part Overview

The BAS21W-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 200V DC reverse voltage and 200mA average rectified current in a SOT-323 surface mount package. This part is Active status and ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility across qualified component sources.

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	100 nA @ 200 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz
Package / Case	SC-70, SOT-323
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the BAS21W-7 is determined by the following critical parameters: maximum reverse voltage (200V), average rectified current (200mA), forward voltage drop (1.25V @ 200mA), reverse recovery time (50ns), reverse leakage current (100nA @ 200V), and surface mount package compatibility (SOT-323 or equivalent footprint).

Direct Substitutes maintain identical electrical specifications and package form factor, differing only in packaging format (Cut Tape vs. Tape & Reel) or manufacturer source.

Similar Substitutes meet or exceed the primary electrical ratings (reverse voltage and current capacity) but may differ in secondary parameters such as package type, reverse leakage characteristics, or temperature range. These parts are functionally equivalent for applications where the specified electrical performance is the primary selection criterion.

Parameter Comparison

Parameter	BAS21W-7	BAS21W-7-F	BAS21WT-TP	MMBD1504A	BAS20,215	BAS20,235
Manufacturer	Diodes Incorporated	Diodes Incorporated	Micro Commercial Co	onsemi	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V	150 V	150 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	1.1 V @ 200 mA	1.25 V @ 200 mA	1.25 V @ 200 mA
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	Not specified	50 ns	50 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	100 nA @ 200 V	100 nA @ 200 V	10 nA @ 180 V	100 nA @ 150 V	100 nA @ 150 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	Not specified	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	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	150°C (Max)	150°C (Max)	150°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BAS21W-7-F (Diodes Incorporated) is a direct electrical and functional equivalent, differing only in packaging format (Tape & Reel vs. Cut Tape). Both parts maintain identical 200V reverse voltage, 200mA current rating, and SOT-323 package specifications. Selection between BAS21W-7 and BAS21W-7-F is determined by procurement and assembly requirements.

BAS21WT-TP (Micro Commercial Co) provides equivalent electrical performance with identical voltage, current, and package specifications. The operating temperature range is -55°C to 150°C compared to -65°C to 150°C for the BAS21W-7, representing a narrower lower temperature specification. This part is suitable for applications where the minimum junction temperature requirement does not extend below -55°C.

MMBD1504A (onsemi) is a diode array configuration (1 Pair Common Cathode) with matching 200V reverse voltage and 200mA per-diode current rating. The package is SOT-23-3 (TO-236-3, SC-59) rather than SOT-323, requiring PCB layout modification. Forward voltage is 1.1V @ 200mA, representing lower forward drop than the BAS21W-7. Reverse leakage is 10nA @ 180V, lower than the 100nA @ 200V specification. This part is suitable only when the diode array configuration and alternate package footprint are compatible with circuit design.

BAS20,215 and BAS20,235 (Nexperia USA Inc.) are rated for 150V maximum reverse voltage, representing a 25% reduction from the BAS21W-7 specification. Both maintain 200mA current rating and equivalent forward voltage characteristics. These parts are suitable only for applications where the circuit maximum reverse voltage does not exceed 150V. Package is TO-236AB (SOT-23-3) rather than SOT-323, requiring PCB layout modification.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and Active product status.

Frequently Asked Questions (FAQ)

Q: Can BAS21W-7-F be used as a direct replacement for BAS21W-7?

A: Yes. BAS21W-7-F is manufactured by Diodes Incorporated with identical electrical specifications (200V, 200mA, 1.25V forward voltage) and SOT-323 package. The difference is packaging format: BAS21W-7 is supplied in Cut Tape, while BAS21W-7-F is supplied in Tape & Reel. Both are ROHS3 compliant with MSL 1 rating.

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

A: BAS21WT-TP is manufactured by Micro Commercial Co and maintains identical electrical ratings and SOT-323 package. The operating temperature range is -55°C to 150°C versus -65°C to 150°C for BAS21W-7. Selection depends on whether the application requires operation below -55°C junction temperature.

Q: Why is MMBD1504A listed as a similar substitute rather than a direct substitute?

A: MMBD1504A is a diode array (1 Pair Common Cathode) in SOT-23-3 package, whereas BAS21W-7 is a single diode in SOT-323 package. While electrical ratings match (200V, 200mA), the package footprint and internal configuration differ, requiring circuit and PCB design modification.

Q: Can BAS20,215 or BAS20,235 replace BAS21W-7 in all applications?

A: No. BAS20,215 and BAS20,235 are rated for maximum 150V reverse voltage, compared to 200V for BAS21W-7. These parts are suitable only for circuits where the maximum reverse voltage specification does not exceed 150V. Additionally, the package is TO-236AB (SOT-23-3) rather than SOT-323, requiring PCB layout modification.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (BAS21W-7-F, BAS21WT-TP, MMBD1504A, BAS20,215, BAS20,235) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the primary criterion for substitution compatibility?

A: The primary criteria are maximum reverse voltage (200V for direct substitutes), average rectified current (200mA), and surface mount package compatibility. Secondary parameters include forward voltage drop, reverse recovery time, and reverse leakage current. Package footprint compatibility must be verified for PCB layout.

Q: Does forward voltage difference between BAS21W-7 and MMBD1504A affect substitution?

A: MMBD1504A has a lower forward voltage (1.1V @ 200mA) compared to BAS21W-7 (1.25V @ 200mA). In applications sensitive to forward voltage drop, this difference may affect circuit performance. The diode array configuration also requires circuit design modification.

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