BAS21T-TP Equivalent & Substitute Parts

Part Overview

The BAS21T-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, designed for surface mount applications in SOT-523 packaging. This component operates at 250 V DC reverse voltage with a 200 mA average rectified current rating. The part is currently active in production and widely available in inventory.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter ranges. Alternative sources may be required due to supply chain considerations, inventory availability, or design flexibility across qualified manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	250	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 @ 250 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Package / Case	SOT-523	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the BAS21T-TP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) rating must equal or exceed 250 V
Current - Average Rectified (Io) must equal or exceed 200 mA
Voltage - Forward (Vf) must not exceed 1.25 V @ 200 mA
Reverse Recovery Time (trr) must not exceed 50 ns
Current - Reverse Leakage must not exceed 100 nA @ rated voltage
Capacitance must not exceed 5 pF @ 0V, 1MHz

Mechanical Compatibility Requirements:

Package / Case must be SOT-523
Mounting Type must be Surface Mount
Operating Temperature range must encompass -65°C to 150°C

Compliance Requirements:

RoHS3 Compliant status required
Moisture Sensitivity Level (MSL) of 1 or better
REACH Unaffected status required

Parts meeting all electrical, mechanical, and compliance criteria are classified as direct substitutes.

Parameter Comparison

Parameter	BAS21T-TP (Main Part)	BAS21T-7-F (Substitute)	Compatibility
Manufacturer	Micro Commercial Co	Diodes Incorporated	Different manufacturer
Voltage - DC Reverse (Vr) (Max)	250 V	200 V	Substitute rated lower
Current - Average Rectified (Io)	200 mA	200 mA	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	Equivalent
Reverse Recovery Time (trr)	50 ns	50 ns	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 250 V	100 nA @ 200 V	Equivalent at rated voltage
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	Equivalent
Package / Case	SOT-523	SOT-523	Equivalent
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

BAS21T-TP (Micro Commercial Co): Select this part when applications require the full 250 V DC reverse voltage rating. This part maintains active production status with substantial inventory availability (3890 pcs). ROHS3 compliance and MSL 1 rating support standard manufacturing and storage conditions.

BAS21T-7-F (Diodes Incorporated): This substitute is suitable for applications operating at 200 V DC reverse voltage or lower. The part is active in production with adequate inventory (1551 pcs). Electrical performance characteristics including forward voltage, reverse recovery time, and leakage current are equivalent to the main part. ROHS3 compliance and MSL 1 rating match the primary part's environmental specifications.

Selection Basis: Both parts share identical mechanical packaging (SOT-523), thermal operating range (-65°C to 150°C), and regulatory compliance status. The primary distinction is the maximum reverse voltage rating. Applications requiring 250 V operation must use BAS21T-TP. Applications operating at 200 V or lower may use either part based on availability and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can BAS21T-7-F replace BAS21T-TP in all applications?

A: No. The BAS21T-7-F has a maximum reverse voltage rating of 200 V, while the BAS21T-TP is rated for 250 V. Substitution is valid only in circuits where the reverse voltage does not exceed 200 V. Applications requiring the full 250 V rating must use BAS21T-TP.

Q: Are the forward voltage characteristics identical between these parts?

A: Yes. Both parts specify a maximum forward voltage of 1.25 V @ 200 mA. Forward voltage performance is equivalent.

Q: Do both parts use the same package?

A: Yes. Both BAS21T-TP and BAS21T-7-F use SOT-523 surface mount packaging. PCB footprints and reflow soldering profiles are identical.

Q: What is the reverse recovery time for both parts?

A: Both parts have a reverse recovery time of 50 ns, indicating equivalent switching speed characteristics for small-signal rectification applications.

Q: Are there differences in leakage current specifications?

A: The leakage current specifications are equivalent at their respective rated voltages: 100 nA @ 250 V for BAS21T-TP and 100 nA @ 200 V for BAS21T-7-F. At lower operating voltages, leakage current typically decreases.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level) ratings. Operating temperature ranges are identical at -65°C to 150°C.

Q: What is the capacitance specification for these diodes?

A: Both parts specify 5 pF @ 0V, 1MHz. This low capacitance is suitable for high-frequency switching applications.

Q: Can I use BAS21T-TP in place of BAS21T-7-F?

A: Yes. The BAS21T-TP can be used in any application where BAS21T-7-F is specified, as it exceeds all electrical performance requirements. However, this substitution may not be necessary unless specific design requirements or supply constraints apply.

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