BAS21T-7 Equivalent & Substitute Parts

Part Overview

The BAS21T-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-523 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical specifications and package form factors, while substitute parts offer compatible performance within defined parameter tolerances for the same application category.

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 nA @ 200 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Package / Case	SOT-523	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution of the BAS21T-7 is determined by the following critical parameters:

Voltage Rating (Vr): The reverse voltage specification must equal or exceed 200 V. Parts rated at higher voltages (250 V) are acceptable as they provide additional safety margin.

Current Rating (Io): The average rectified current must equal or exceed 200 mA. Parts rated at higher currents (250 mA) are acceptable as they provide additional capacity.

Forward Voltage (Vf): The forward voltage drop must not exceed 1.25 V at 200 mA to maintain circuit performance and power dissipation characteristics.

Reverse Recovery Time (trr): The reverse recovery time must not exceed 50 ns to preserve switching characteristics in rectification applications.

Reverse Leakage Current: The reverse leakage current must not exceed 100 nA at the rated reverse voltage.

Package Compatibility: Surface mount packages SOT-523 and TO-236AB (SOT-23-3) are mechanically compatible with standard PCB assembly processes. Package transitions require PCB layout verification.

Compliance Status: Active product status and RoHS3 compliance are preferred for new designs and long-term supply assurance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Package	Product Status	RoHS Status
BAS21T-7	Diodes Incorporated	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-523	Discontinued	Non-compliant
BAS21T-7-F	Diodes Incorporated	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-523	Active	ROHS3 Compliant
BAS21T-TP	Micro Commercial Co	250	200	1.25 @ 200 mA	50	100 @ 250 V	SOT-523	Active	ROHS3 Compliant
BAS21,215	Nexperia USA Inc.	200	200	1.25 @ 200 mA	50	100 @ 200 V	TO-236AB	Active	ROHS3 Compliant
BAS21,235	Nexperia USA Inc.	200	200	1.25 @ 200 mA	50	100 @ 200 V	TO-236AB	Active	ROHS3 Compliant
BAS21E6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	100 @ 200 V	PG-SOT23	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Same Package, Same Specifications):

BAS21T-7-F is the direct equivalent replacement for BAS21T-7. Both parts are manufactured by Diodes Incorporated with identical electrical specifications and SOT-523 packaging. BAS21T-7-F is currently active with RoHS3 compliance, providing supply continuity and regulatory alignment for new production.

Package-Compatible Substitute (Higher Voltage Rating):

BAS21T-TP manufactured by Micro Commercial Co provides equivalent electrical performance with a 250 V reverse voltage rating in the same SOT-523 package. The elevated voltage specification offers additional design margin without affecting circuit operation at 200 V application levels. This part is active and RoHS3 compliant.

Package-Variant Substitutes (TO-236AB Package):

BAS21,215 and BAS21,235 manufactured by Nexperia USA Inc. provide identical electrical specifications to the original BAS21T-7 in the TO-236AB (SOT-23-3) package. Both parts are active with RoHS3 compliance. BAS21,235 is supplied in Tape & Reel packaging with higher inventory availability (43,679 units). BAS21,215 is supplied in Cut Tape & Digi-Reel format with automotive qualification (AEC-Q101). Package transition from SOT-523 to TO-236AB requires PCB layout modification.

Higher Current Capacity Substitute:

BAS21E6327HTSA1 manufactured by Infineon Technologies provides 250 mA average rectified current capacity with identical 200 V reverse voltage rating and forward voltage characteristics. This part is supplied in PG-SOT23 package and carries Last Time Buy status. The elevated current rating accommodates higher load requirements without exceeding thermal or electrical limits.

Frequently Asked Questions (FAQ)

Q: Can BAS21T-7-F be used as a direct replacement for BAS21T-7?

A: Yes. BAS21T-7-F is electrically and mechanically identical to BAS21T-7, with the same SOT-523 package, 200 V reverse voltage, 200 mA current rating, and all electrical parameters. No circuit modifications are required. BAS21T-7-F is currently active with RoHS3 compliance.

Q: What is the difference between BAS21T-7 and BAS21T-TP?

A: BAS21T-TP has a 250 V reverse voltage rating compared to 200 V for BAS21T-7. All other electrical parameters are identical. Both use the SOT-523 package. BAS21T-TP is manufactured by Micro Commercial Co and is active with RoHS3 compliance.

Q: Can I use BAS21,235 or BAS21,215 instead of BAS21T-7?

A: Yes, with package consideration. Both parts provide identical electrical specifications (200 V, 200 mA, 1.25 V forward voltage) but use the TO-236AB (SOT-23-3) package instead of SOT-523. PCB layout and footprint modifications are required. Both are active with RoHS3 compliance. BAS21,235 is supplied in Tape & Reel; BAS21,215 is supplied in Cut Tape & Digi-Reel with automotive qualification.

Q: What does "Last Time Buy" status mean for BAS21E6327HTSA1?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but future production is not guaranteed. This part should be used only when its specific 250 mA current rating is required and other alternatives are unsuitable.

Q: Are all substitute parts RoHS3 compliant?

A: BAS21T-7-F, BAS21T-TP, BAS21,215, BAS21,235, and BAS21E6327HTSA1 are all RoHS3 compliant. The original BAS21T-7 is RoHS non-compliant. Compliance status should be verified for applications subject to regulatory requirements.

Q: What is the difference between SOT-523 and TO-236AB packages?

A: SOT-523 and TO-236AB are both surface mount packages for three-terminal diodes but have different physical dimensions and footprints. SOT-523 is a smaller package; TO-236AB (also called SOT-23-3 or SC-59) is larger. Substitution between these packages requires PCB redesign and assembly process verification.

Q: Can BAS21E6327HTSA1 be used in place of BAS21T-7?

A: Yes, electrically. BAS21E6327HTSA1 provides 250 mA current capacity versus 200 mA for BAS21T-7, with identical 200 V reverse voltage and forward voltage characteristics. However, it uses the PG-SOT23 package instead of SOT-523, requiring PCB layout modification. This part carries Last Time Buy status.

Q: Which substitute part has the highest inventory availability?

A: BAS21,235 has the highest inventory with 43,679 units in stock, supplied in Tape & Reel packaging. BAS21E6327HTSA1 has 44,100 units but carries Last Time Buy status. BAS21T-7-F has 1,551 units in stock.

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