BAS21-7 Equivalent & Substitute Parts

Part Overview

The BAS21-7 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 SOT-23-3 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within the same application envelope with minor parameter variations.

Key Parameters

Parameter	BAS21-7 Specification
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	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Standard
Speed	Small Signal ≤ 200mA (Io), Any Speed
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BAS21-7 is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), reverse recovery time (trr), reverse leakage current, package type, and mounting configuration. All substitute parts listed maintain the SOT-23-3 surface mount package and support the same thermal operating range or higher.

Substitute parts are grouped into three categories:

Category 1: Parametric Equivalents (Identical Electrical Specifications) Parts with 200 V reverse voltage, 200 mA current rating, 1.25 V forward voltage, and 50 ns recovery time from Diodes Incorporated and Micro Commercial Co.

Category 2: Manufacturer Recommended Substitutes (Enhanced or Equivalent Ratings) Parts with 200 V or 250 V reverse voltage ratings, 200 mA current capacity, and equivalent or superior performance characteristics from Nexperia USA Inc. and onsemi. These include automotive-qualified variants and higher voltage options.

Category 3: Functional Alternatives (Diode Arrays) Parts with common anode or common cathode configurations in the same package, suitable for applications requiring multiple diodes in a single component.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Reverse Leakage @ Vr	Package	Product Status	RoHS Status
BAS21-7	Diodes Incorporated	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Discontinued	RoHS non-compliant
BAS21-7-F	Diodes Incorporated	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Active	ROHS3 Compliant
BAS21Q-7-F	Diodes Incorporated	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Active	ROHS3 Compliant
BAS21,215	Nexperia USA Inc.	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	TO-236-3	Active	ROHS3 Compliant
BAS21,235	Nexperia USA Inc.	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	TO-236-3	Active	ROHS3 Compliant
BAS21A-TP	Micro Commercial Co	250 V	200 mA (per diode)	1.1 V @ 100 mA	50 ns	1 µA @ 200 V	SOT-23-3	Active	ROHS3 Compliant
BAS21LT1G	onsemi	250 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Active	ROHS3 Compliant
BAS21LT3G	onsemi	250 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Active	ROHS3 Compliant
MMBD1504A	onsemi	200 V	200 mA	1.1 V @ 200 mA	50 ns	10 nA @ 180 V	SOT-23-3	Active	ROHS3 Compliant
BAS21	Taiwan Semiconductor Corporation	250 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Active	ROHS3 Compliant
BAS21-TP	Micro Commercial Co	200 V	200 mA	1.25 V @ 200 mA	50 ns	100 nA @ 200 V	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Specifications)

BAS21-7-F and BAS21Q-7-F from Diodes Incorporated are direct parametric equivalents with identical electrical characteristics and the same SOT-23-3 package. Both parts are currently active and ROHS3 compliant, addressing the RoHS non-compliance status of the discontinued BAS21-7. These parts are recommended for applications requiring exact specification matching.

Manufacturer-Recommended Alternatives (200 V Rating)

BAS21,215 and BAS21,235 from Nexperia USA Inc. maintain the 200 V reverse voltage and 200 mA current specifications. BAS21,215 is automotive-qualified to AEC-Q101 standard, suitable for automotive and high-reliability applications. BAS21-TP from Micro Commercial Co provides equivalent 200 V performance in tape and reel packaging.

Enhanced Voltage Rating Alternatives (250 V Rating)

BAS21LT1G and BAS21LT3G from onsemi, along with BAS21 from Taiwan Semiconductor Corporation, offer 250 V reverse voltage ratings while maintaining 200 mA current capacity and identical forward voltage characteristics. These parts provide additional voltage margin for applications with transient overvoltage conditions. Both onsemi variants are ROHS3 compliant and currently in active production with high inventory availability.

Functional Alternatives (Diode Arrays)

MMBD1504A from onsemi is a common cathode diode array in SOT-23-3 package with 200 V rating and 200 mA per diode capacity. BAS21A-TP from Micro Commercial Co is a common anode diode array with 250 V rating. These components are suitable for applications requiring multiple diodes in a single package but require circuit topology compatibility with the array configuration.

All recommended substitutes maintain the SOT-23-3 surface mount package, MSL 1 moisture sensitivity level, and REACH unaffected status. Selection should be based on specific application requirements for voltage margin, packaging format (cut tape vs. tape and reel), and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can BAS21-7-F be used as a direct replacement for BAS21-7?

A: Yes. BAS21-7-F is a parametric equivalent with identical electrical specifications (200 V, 200 mA, 1.25 V forward voltage, 50 ns recovery time) and the same SOT-23-3 package. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between BAS21-7-F and BAS21Q-7-F?

A: Both parts are parametric equivalents from Diodes Incorporated with identical electrical specifications and SOT-23-3 packaging. The designation difference (BAS21-7-F vs. BAS21Q-7-F) reflects internal Diodes Incorporated product line variations. Both are active, ROHS3 compliant, and suitable for direct substitution.

Q: Can I use a 250 V rated part (BAS21LT1G) in place of the 200 V BAS21-7?

A: Yes. The BAS21LT1G maintains identical electrical performance (200 mA current, 1.25 V forward voltage, 50 ns recovery time) with an enhanced 250 V reverse voltage rating. Higher voltage rating provides additional safety margin and is compatible with 200 V applications. The SOT-23-3 package and thermal range (-55°C to 150°C) are compatible.

Q: What is the difference between BAS21,215 and BAS21,235?

A: Both are Nexperia USA Inc. parts with identical electrical specifications (200 V, 200 mA, 1.25 V forward voltage). The primary difference is packaging format: BAS21,215 is supplied in cut tape and digi-reel format, while BAS21,235 is supplied in tape and reel format. Electrical performance is identical.

Q: Is BAS21,215 suitable for automotive applications?

A: Yes. BAS21,215 is automotive-qualified to AEC-Q101 standard and carries automotive-grade designation. It is suitable for automotive and high-reliability applications requiring qualified component status.

Q: What is MMBD1504A and when should it be used?

A: MMBD1504A is a common cathode diode array containing two diodes in a single SOT-23-3 package. It is suitable for applications requiring multiple diodes with a shared cathode connection. It maintains 200 V rating and 200 mA per diode capacity. Circuit topology must accommodate the array configuration; it is not a pin-for-pin replacement for single diode applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (BAS21-7-F, BAS21Q-7-F, BAS21,215, BAS21,235, BAS21A-TP, BAS21LT1G, BAS21LT3G, MMBD1504A, BAS21, and BAS21-TP) are ROHS3 compliant. The original BAS21-7 is RoHS non-compliant, making compliant substitutes necessary for new designs and procurement.

Q: What is the difference between cut tape and tape and reel packaging?

A: Cut tape (CT) packaging supplies components in individual tape segments suitable for manual handling and small-quantity applications. Tape and reel (TR) packaging supplies components on continuous reels suitable for automated assembly equipment and high-volume production. Electrical specifications are identical; packaging selection depends on assembly process requirements.

Q: Can I substitute BAS21-TP for BAS21-7?

A: Yes. BAS21-TP from Micro Commercial Co maintains identical electrical specifications (200 V, 200 mA, 1.25 V forward voltage, 50 ns recovery time) and SOT-23-3 package. It is ROHS3 compliant and currently active. The primary difference is manufacturer and packaging format (tape and reel).

Q: What does "Small Signal ≤ 200mA (Io), Any Speed" mean?

A: This classification indicates the diode is rated for small signal applications with average rectified current not exceeding 200 mA. "Any Speed" indicates the diode is suitable for both fast and slow switching applications without speed-specific limitations. All listed parts share this classification.

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