BAS20 General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The BAS20 is a general purpose rectifier diode manufactured by onsemi, rated for 200V DC reverse voltage and 200mA average rectified current in a surface mount SOT-23-3 package. The BAS20 is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

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 @ 50 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BAS20 are classified into three categories based on electrical and mechanical compatibility:

Direct Equivalents (Parametric Match - Same Voltage Rating) Parts that match all critical electrical parameters of the BAS20: 200V reverse voltage, 200mA average rectified current, 1.25V forward voltage at 200mA, 50ns reverse recovery time, and identical SOT-23-3 package. These parts are pin-compatible and functionally interchangeable without circuit modification.

Higher Voltage Equivalents (Parametric Upgrade - 250V Rating) Parts rated for 250V DC reverse voltage while maintaining 200mA current rating and identical package. These parts are electrically compatible in applications where the BAS20 is used, as they provide enhanced voltage margin. The 250V rating does not degrade performance in 200V circuits.

Automotive Grade Equivalents (AEC-Q101 Qualified) Parts meeting automotive qualification standards while maintaining identical electrical specifications and package. These parts include automotive-grade screening and reliability testing.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): 200V minimum
Current - Average Rectified (Io): 200mA
Voltage - Forward (Vf) (Max) @ If: 1.25V @ 200mA
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Reverse Recovery Time (trr): 50ns
Operating Temperature Range: -55°C to 150°C minimum

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf @ 200mA [V]	trr [ns]	Package	Product Status	Packaging Type
BAS20	onsemi	200	200	1.25	50	SOT-23-3	Obsolete	—
BAS20LT1G	onsemi	200	200	1.25	50	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
BAS20LT3G	onsemi	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
SBAS20LT1G	onsemi	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
NSVBAS20LT3G	onsemi	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
BAS21LT1G	onsemi	250	200	1.25	50	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
BAS21LT3G	onsemi	250	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
SBAS21LT1G	onsemi	250	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)
SBAS21LT3G	onsemi	250	200	1.25	50	SOT-23-3	Active	Cut Tape (CT) & Digi-Reel®
CMPD2003 BK	Central Semiconductor Corp	200	200	1.25	50	SOT-23-3	Active	—
CMPD2003 TR PBFREE	Central Semiconductor Corp	200	200	1.25	50	SOT-23-3	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select BAS20LT1G, BAS20LT3G, SBAS20LT1G, or CMPD2003 TR PBFREE. These parts maintain 200V reverse voltage rating and are electrically identical to the obsolete BAS20. BAS20LT1G and BAS20LT3G are recommended as primary choices due to active product status and onsemi manufacturer continuity. Packaging selection (Cut Tape vs. Tape & Reel) depends on production volume and assembly requirements.

For Automotive Applications: Select NSVBAS20LT3G. This part meets AEC-Q101 automotive qualification requirements while maintaining identical electrical specifications and SOT-23-3 package compatibility. Use this part for automotive-grade designs requiring documented reliability and screening.

For Enhanced Voltage Margin: Select BAS21LT1G, BAS21LT3G, SBAS21LT1G, or SBAS21LT3G. These parts provide 250V reverse voltage rating while maintaining 200mA current and identical package. Use in applications where additional voltage headroom is beneficial or where circuit design permits higher voltage-rated components.

Compliance Considerations: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original BAS20. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can BAS20LT1G directly replace the obsolete BAS20? A: Yes. BAS20LT1G is electrically and mechanically identical to BAS20, with matching 200V reverse voltage, 200mA current rating, 1.25V forward voltage, and SOT-23-3 package. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel® vs. unspecified).

Q: What is the difference between BAS20LT1G and BAS20LT3G? A: Both parts are electrically identical with matching specifications. The difference is packaging format: BAS20LT1G is supplied in Cut Tape (CT) & Digi-Reel® format, while BAS20LT3G is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment compatibility and production volume.

Q: Can I use BAS21LT1G in place of BAS20? A: Yes, with design consideration. BAS21LT1G has identical current and forward voltage specifications but is rated for 250V reverse voltage instead of 200V. This higher voltage rating is compatible with BAS20 applications and provides additional voltage margin. No circuit modification is required.

Q: What does the "S" prefix in SBAS20LT1G indicate? A: The "S" prefix indicates a Schottky variant or special screening grade designation from onsemi. SBAS20LT1G maintains identical electrical specifications to BAS20LT1G and is pin-compatible. Verify specific screening requirements with onsemi documentation if critical reliability data is needed.

Q: Is NSVBAS20LT3G suitable for non-automotive applications? A: Yes. NSVBAS20LT3G meets AEC-Q101 automotive qualification but is electrically and mechanically identical to standard BAS20. It can be used in non-automotive applications where the automotive-grade screening and reliability testing provide additional assurance.

Q: What is the difference between CMPD2003 BK and CMPD2003 TR PBFREE? A: Both are electrically identical Central Semiconductor Corp equivalents with 200V/200mA specifications. CMPD2003 TR PBFREE is supplied in Tape & Reel format with lead-free (PBFREE) processing, while CMPD2003 BK packaging format is unspecified. Select based on assembly process requirements and packaging compatibility.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original BAS20. All parts are also REACH unaffected and carry EAR99 ECCN classification.

Q: What is the operating temperature range for substitute parts? A: All substitute parts operate from -55°C to 150°C junction temperature, matching the BAS20 specification. CMPD2003 variants extend the lower temperature limit to -65°C, providing enhanced low-temperature performance if required.

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