BAS21HT3G Equivalent & Substitute Parts

Part Overview

The BAS21HT3G is a general-purpose rectifier diode manufactured by onsemi, rated for 250 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement continuity. Active alternatives provide equivalent or enhanced electrical performance while maintaining compatibility with existing circuit designs and manufacturing processes.

Key Parameters

Parameter	BAS21HT3G Value
Voltage - DC Reverse (Vr) (Max)	250 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-76, SOD-323
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BAS21HT3G is determined by the following critical parameters: reverse voltage rating (250 V maximum), average rectified current (200 mA), forward voltage drop (1.25 V @ 200 mA), reverse recovery time (50 ns), and package type (SOD-323). Parts are classified into two categories:

Parametric Equivalents maintain all critical electrical specifications and package compatibility. These parts satisfy direct replacement requirements without circuit modification.

Similar Parts provide equivalent or enhanced electrical performance but may differ in specific parameters such as forward voltage measurement conditions, current ratings, or package variants (SOT-323 vs. SOD-323). These parts require design verification for application-specific compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Package	Status
BAS21HT3G	onsemi	250 V	200 mA	1.25 V @ 200 mA	50 ns	SOD-323	Obsolete
BAS21HT1G	onsemi	250 V	200 mA	1.25 V @ 200 mA	50 ns	SOD-323	Active
BAS21AHT1G	onsemi	200 V	200 mA	1.25 V @ 200 mA	50 ns	SOD-323	Active
NSVBAS21HT1G	onsemi	250 V	200 mA	1.25 V @ 200 mA	50 ns	SOD-323	Active
NSVBAS21HT3G	onsemi	250 V	200 mA	1.25 V @ 200 mA	50 ns	SOD-323	Active
NSVBAS21AHT1G	onsemi	200 V	200 mA	1.25 V @ 200 mA	50 ns	SOD-323	Active
BAS21W RVG	Taiwan Semiconductor Corporation	250 V	200 mA	1.25 V @ 100 mA	50 ns	SOT-323	Active
GSD2004WS-E3-08	Vishay General Semiconductor	240 V	225 mA	1 V @ 100 mA	50 ns	SOD-323	Active
BAV21WS	EVVO Semi	250 V	250 mA	1.25 V @ 200 mA	50 ns	SOD-323	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

BAS21HT1G and NSVBAS21HT3G are full parametric equivalents to the BAS21HT3G, maintaining identical electrical specifications and SOD-323 packaging. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. BAS21HT1G is available in Cut Tape and Digi-Reel packaging with 7,965,200 units in stock. NSVBAS21HT3G is available in Tape & Reel packaging with 295,100 units in stock. These parts provide direct substitution without circuit modification.

NSVBAS21HT1G offers equivalent specifications with automotive-grade qualification (AEC-Q101) available through the NSVBAS21AHT1G variant, suitable for applications requiring automotive-level reliability.

Voltage-Reduced Alternative:

BAS21AHT1G and NSVBAS21AHT1G reduce the reverse voltage rating to 200 V while maintaining 200 mA current capacity and identical forward voltage characteristics. These parts are suitable for applications where 200 V reverse voltage margin is sufficient. NSVBAS21AHT1G includes AEC-Q101 automotive qualification.

Enhanced Current Rating:

BAV21WS increases the average rectified current to 250 mA while maintaining 250 V reverse voltage and 1.25 V forward voltage @ 200 mA. This part provides additional current margin for applications requiring higher current capacity within the same package footprint.

Alternative Package Consideration:

BAS21W RVG from Taiwan Semiconductor Corporation provides equivalent electrical performance in SOT-323 package (SC-70) instead of SOD-323. This part is suitable only if circuit board layout accommodates SOT-323 footprint. Forward voltage is specified at 100 mA rather than 200 mA.

Vishay Alternative:

GSD2004WS-E3-08 provides similar performance with 240 V reverse voltage and 225 mA current rating. Forward voltage is specified at 1 V @ 100 mA. This part is classified as Fast Recovery technology with recovery time of 50 ns.

Frequently Asked Questions (FAQ)

Q: Can BAS21HT1G directly replace BAS21HT3G?

A: Yes. BAS21HT1G is a parametric equivalent with identical electrical specifications (250 V, 200 mA, 1.25 V @ 200 mA, 50 ns recovery time) and SOD-323 packaging. The primary difference is product status: BAS21HT3G is obsolete while BAS21HT1G is active. No circuit modification is required.

Q: What is the difference between BAS21HT1G and NSVBAS21HT1G?

A: Both parts are parametric equivalents with identical electrical specifications and SOD-323 packaging. NSVBAS21HT1G is the automotive-qualified variant of the BAS21 series. Selection depends on application requirements and supply chain preferences. NSVBAS21HT1G is available in Cut Tape & Digi-Reel packaging with 65,200 units in stock.

Q: Can I use BAS21AHT1G as a substitute for BAS21HT3G?

A: BAS21AHT1G is suitable only if the application circuit operates at 200 V reverse voltage or lower. The reverse voltage rating is reduced from 250 V to 200 V. All other electrical parameters (200 mA current, 1.25 V forward voltage, 50 ns recovery time) and SOD-323 packaging remain identical. Circuit design review is required to confirm 200 V reverse voltage margin is acceptable.

Q: What is the difference between SOD-323 and SOT-323 packages?

A: SOD-323 (SC-76) and SOT-323 (SC-70) are different surface mount package footprints. BAS21W RVG uses SOT-323 package while BAS21HT3G uses SOD-323. These packages are not mechanically interchangeable. Substitution with BAS21W RVG requires circuit board redesign to accommodate the different footprint.

Q: Why is BAV21WS listed as a substitute if it has 250 mA current rating instead of 200 mA?

A: BAV21WS maintains all critical electrical specifications (250 V reverse voltage, 1.25 V forward voltage @ 200 mA, 50 ns recovery time) and SOD-323 packaging. The increased current rating (250 mA vs. 200 mA) provides additional design margin without reducing performance. This part is suitable for direct replacement in applications where the higher current capacity does not create thermal or design conflicts.

Q: Is GSD2004WS-E3-08 a direct replacement for BAS21HT3G?

A: GSD2004WS-E3-08 is a similar part with comparable but not identical specifications. Reverse voltage is 240 V (vs. 250 V), current rating is 225 mA (vs. 200 mA), and forward voltage is specified at 1 V @ 100 mA (vs. 1.25 V @ 200 mA). Technology classification differs (Fast Recovery vs. Standard). This part is suitable only if circuit design accommodates the parameter variations and forward voltage measurement conditions.

Q: What does ROHS3 compliance mean for these diodes?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specific brominated flame retardants. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory compatibility with existing design standards.

Q: Are all substitute parts available in the same packaging options?

A: No. BAS21HT1G is available in Cut Tape & Digi-Reel packaging. NSVBAS21HT3G is available in Tape & Reel packaging. BAS21W RVG is available in Tape & Reel packaging. Packaging selection depends on manufacturing process requirements and supply chain logistics. Verify packaging compatibility with assembly equipment before final part selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message