BAS21LT3G Equivalent & Substitute Parts

Part Overview

The BAS21LT3G 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 SOT-23-3 (TO-236) package. This diode is classified as a small signal rectifier with a reverse recovery time of 50 ns, suitable for general switching and rectification applications. The part is Active in product status and ROHS3 compliant.

Equivalent and substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and packaging specifications. Alternative sources and packaging formats are available to support supply chain flexibility and design requirements.

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 V @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	nA
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	pF
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BAS21LT3G are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalents (Full Electrical Match): Parts that match all critical electrical parameters including 250 V reverse voltage rating, 200 mA current rating, 1.25 V forward voltage, 50 ns reverse recovery time, and identical leakage and capacitance specifications. These parts are direct functional replacements with potential differences only in packaging format (Tape & Reel versus Cut Tape).

Direct Manufacturer Alternatives (Reduced Voltage Rating): Parts rated for 200 V reverse voltage instead of 250 V, with all other electrical parameters matching. These parts are suitable for applications where the lower voltage rating is acceptable and provide alternative sourcing from different manufacturers.

Similar Parts (Voltage Variation): Parts from alternative manufacturers with 200 V reverse voltage ratings and matching current, forward voltage, and recovery time specifications. These parts maintain functional compatibility within lower voltage application requirements.

The key parameters determining substitution eligibility are: Voltage - DC Reverse (Vr) (Max), Current - Average Rectified (Io), Voltage - Forward (Vf) (Max) @ If, Reverse Recovery Time (trr), and package compatibility (SOT-23-3 / TO-236).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Package	Packaging Format	Status
BAS21LT3G	onsemi	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Tape & Reel (TR)	Active
BAS21LT1G	onsemi	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Cut Tape (CT) & Digi-Reel®	Active
SBAS21LT1G	onsemi	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Tape & Reel (TR)	Active
SBAS21LT3G	onsemi	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Cut Tape (CT) & Digi-Reel®	Active
BAS21,215	Nexperia USA Inc.	200	200	1.25 @ 200 mA	50	100 @ 200 V	TO-236AB	Cut Tape (CT) & Digi-Reel®	Active
BAS21,235	Nexperia USA Inc.	200	200	1.25 @ 200 mA	50	100 @ 200 V	TO-236AB	Tape & Reel (TR)	Active
BAS21-7-F	Diodes Incorporated	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Cut Tape (CT) & Digi-Reel®	Active
BAS21-E3-18	Vishay General Semiconductor - Diodes Division	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Cut Tape (CT)	Active
BAS21-TP	Micro Commercial Co	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Tape & Reel (TR)	Active
BAS21_R1_00001	Panjit International Inc.	200	200	1 @ 100 mA	50	1 µA @ 200 V	SOT-23-3	Tape & Reel (TR)	Active
BAS21 RFG	Taiwan Semiconductor Corporation	250	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Tape & Reel (TR)	Active

Engineering Selection Recommendations

Parametric Equivalent Selection (BAS21LT1G, SBAS21LT1G, SBAS21LT3G, BAS21 RFG):

These parts provide full electrical equivalence to the BAS21LT3G with identical 250 V reverse voltage rating and all electrical specifications. Selection among these options is determined by packaging format requirements:

BAS21LT1G and SBAS21LT3G are available in Cut Tape & Digi-Reel® format for applications requiring individual component handling or smaller quantity procurement.
SBAS21LT1G and BAS21 RFG are supplied in Tape & Reel format for high-volume automated assembly operations.

All parametric equivalents maintain ROHS3 compliance, MSL 1 rating, and Active product status.

Direct Manufacturer Alternative Selection (BAS21,215, BAS21,235):

Nexperia USA Inc. BAS21,215 and BAS21,235 parts are rated for 200 V reverse voltage, representing a 50 V reduction from the BAS21LT3G specification. These parts are suitable for applications where the circuit design operates below 200 V and where Nexperia sourcing is preferred. BAS21,215 is available in Cut Tape & Digi-Reel® format, while BAS21,235 is supplied in Tape & Reel format. Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance.

Similar Part Selection (BAS21-7-F, BAS21-E3-18, BAS21-TP, BAS21_R1_00001):

These parts from Diodes Incorporated, Vishay, Micro Commercial Co, and Panjit International are rated for 200 V reverse voltage with matching 200 mA current and 50 ns recovery time. BAS21_R1_00001 exhibits variation in forward voltage specification (1 V @ 100 mA) and reverse leakage (1 µA @ 200 V), requiring circuit-level verification for applications sensitive to these parameters. All similar parts maintain ROHS3 compliance and Active status.

Frequently Asked Questions (FAQ)

Q: Can BAS21LT1G be used as a direct replacement for BAS21LT3G?

A: Yes. BAS21LT1G is a parametric equivalent with identical electrical specifications (250 V, 200 mA, 1.25 V forward voltage, 50 ns recovery time). The only difference is packaging format: BAS21LT1G is supplied in Cut Tape & Digi-Reel® while BAS21LT3G is supplied in Tape & Reel. Both are onsemi products with ROHS3 compliance and MSL 1 rating.

Q: What is the voltage rating difference between BAS21LT3G and BAS21,215?

A: BAS21LT3G is rated for 250 V DC reverse voltage, while BAS21,215 is rated for 200 V. The BAS21,215 can be used in applications where the circuit operates below 200 V. All other electrical parameters (200 mA current, 1.25 V forward voltage, 50 ns recovery time) are identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the BAS21LT3G compliance profile.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape suitable for high-speed automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® packaging provides components on tape that can be cut into smaller quantities for manual handling or lower-volume assembly. Both formats contain identical components; the difference is in delivery and handling format.

Q: Can BAS21_R1_00001 be used as a substitute?

A: BAS21_R1_00001 from Panjit International maintains the 200 V rating, 200 mA current, and 50 ns recovery time. However, it specifies forward voltage as 1 V @ 100 mA (versus 1.25 V @ 200 mA) and reverse leakage as 1 µA @ 200 V (versus 100 nA @ 200 V). Applications sensitive to forward voltage drop or leakage current require circuit-level verification before substitution.

Q: Which substitute part has automotive qualification?

A: BAS21,215 and BAS21,235 from Nexperia USA Inc. carry AEC-Q101 automotive qualification, making them suitable for automotive applications requiring this certification level.

Q: Are there inventory differences between substitute parts?

A: Yes. Inventory levels vary by part number and supplier. BAS21LT1G (onsemi) has 394,078 pcs available, SBAS21LT1G has 410,400 pcs, and BAS21-TP (Micro Commercial Co) has only 2,010 pcs. Inventory should be verified with suppliers for procurement planning.

Q: Can BAS21 RFG from Taiwan Semiconductor Corporation be used?

A: Yes. BAS21 RFG is a parametric equivalent with 250 V rating, 200 mA current, 1.25 V forward voltage, and 50 ns recovery time. It is supplied in Tape & Reel format and maintains ROHS3 compliance and Active product status.

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