BAS19LT1 Equivalent & Substitute Parts

Part Overview

The BAS19LT1 is a general-purpose silicon diode rated for 120 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 (TO-236) package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design and procurement requirements. The diode exhibits small signal characteristics with a 50 ns reverse recovery time and operates across a junction temperature range of -55°C to 150°C. Substitute parts must maintain electrical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	120	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 @ 100 V	nA
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	pF
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Technology	Standard	—

Substitute Part Grouping Explanation

Substitute parts for the BAS19LT1 are classified into three categories based on electrical and mechanical compatibility:

Direct Equivalents (Identical Electrical Parameters): Parts that maintain all critical electrical specifications including 120 V reverse voltage rating, 200 mA current rating, 1.25 V forward voltage at 200 mA, 50 ns reverse recovery time, and identical package configuration. These parts are pin-compatible and functionally interchangeable.

Parametric Equivalents (Matching Core Specifications): Parts that satisfy the primary electrical requirements (120 V reverse voltage, 200 mA current, SOT-23-3 package) with identical or superior performance characteristics. These parts are suitable for direct substitution in applications where the BAS19LT1 specifications are required.

Similar Parts (Reduced Voltage Rating): Parts that operate at lower reverse voltage ratings (100 V) but maintain the 200 mA current rating and SOT-23-3 package. These parts are suitable only for applications where the circuit operates below the reduced voltage threshold.

Higher-Rated Parts (Elevated Specifications): Parts that exceed the BAS19LT1 specifications in voltage or current rating. These parts provide additional design margin and are suitable for applications requiring enhanced performance.

The critical parameters determining substitution eligibility are: Voltage - DC Reverse (Vr) (Max), Current - Average Rectified (Io), Voltage - Forward (Vf) (Max) @ If, Reverse Recovery Time (trr), Package / Case, and Mounting Type.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Package	Product Status	RoHS Status
BAS19LT1	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Obsolete	Non-compliant
BAS19LT1G	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS19LT3G	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
NSVBAS19LT1G	onsemi	120	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS29	onsemi	120	200	1.0 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS19,215	Nexperia USA Inc.	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS19,235	Nexperia USA Inc.	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS19-7-F	Diodes Incorporated	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS19-E3-08	Vishay General Semiconductor	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
BAS21E6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	SOT-23-3	Last Time Buy	ROHS3 Compliant
BAS29,215	Nexperia USA Inc.	90	250	1.0 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

BAS19LT1G, BAS19LT3G, and NSVBAS19LT1G are direct functional equivalents to the BAS19LT1. All three parts maintain identical electrical specifications (120 V reverse voltage, 200 mA current, 1.25 V forward voltage, 50 ns recovery time) and SOT-23-3 packaging. These parts are manufactured by onsemi and carry Active product status with ROHS3 compliance, addressing the obsolescence of the original BAS19LT1. BAS19LT1G is available in Tape & Reel packaging with 355,400 units in stock. BAS19LT3G offers 48,712 units in stock. NSVBAS19LT1G provides the highest inventory availability at 71,064 units.

Secondary Substitutes (Reduced Voltage Rating):

BAS19,215 (Nexperia), BAS19,235 (Nexperia), BAS19-7-F (Diodes Incorporated), and BAS19-E3-08 (Vishay) are suitable substitutes for applications operating at or below 100 V reverse voltage. These parts maintain the 200 mA current rating, 1.25 V forward voltage, 50 ns recovery time, and SOT-23-3 package. All carry Active product status and ROHS3 compliance. BAS19,215 and BAS19,235 include AEC-Q100 automotive qualification. Selection among these parts depends on supply chain availability and specific manufacturing requirements.

Higher-Rated Substitute (Enhanced Performance):

BAS21E6327HTSA1 (Infineon) provides elevated specifications with 200 V reverse voltage and 250 mA current rating. This part is suitable for applications requiring additional design margin beyond the BAS19LT1 specifications. The part carries Last Time Buy status and ROHS3 compliance. Forward voltage remains at 1.25 V @ 200 mA with 50 ns recovery time and SOT-23-3 packaging.

Not Recommended:

BAS29,215 (Nexperia) operates at 90 V reverse voltage with 250 mA current rating and exhibits different forward voltage (1.0 V @ 200 mA) and capacitance characteristics (35 pF @ 0V, 1MHz). This part is classified as Avalanche technology and is not suitable for direct substitution in standard general-purpose diode applications.

Frequently Asked Questions (FAQ)

Q: Can BAS19LT1G be used as a direct replacement for BAS19LT1?

A: Yes. BAS19LT1G maintains identical electrical specifications (120 V reverse voltage, 200 mA current, 1.25 V forward voltage, 50 ns recovery time) and SOT-23-3 package configuration. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-compliant). BAS19LT1G is the recommended replacement for obsolete BAS19LT1 applications.

Q: What is the difference between BAS19LT1G, BAS19LT3G, and NSVBAS19LT1G?

A: All three parts are electrically identical with 120 V reverse voltage, 200 mA current, and SOT-23-3 packaging. The differences are in manufacturing date codes and inventory availability. NSVBAS19LT1G uses the NSV prefix designation. Selection among these parts is based on supply chain availability and procurement requirements.

Q: Can I use BAS19,215 or BAS19-7-F in place of BAS19LT1?

A: These parts are suitable only for applications operating at or below 100 V reverse voltage. The BAS19LT1 is rated for 120 V. If your circuit operates below 100 V, these parts are compatible. If your circuit requires the full 120 V rating, these parts are not suitable.

Q: What is the advantage of using BAS21E6327HTSA1 over BAS19LT1G?

A: BAS21E6327HTSA1 provides higher voltage (200 V) and current (250 mA) ratings, offering additional design margin for applications requiring enhanced performance specifications. However, this part carries Last Time Buy status, indicating limited future availability. Use this part only when the elevated specifications are required.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry ROHS3 compliance. The original BAS19LT1 is RoHS non-compliant. Substitution with any listed part addresses RoHS compliance requirements for new designs and manufacturing.

Q: Do the substitute parts require different PCB footprints?

A: No. All substitute parts use SOT-23-3 (TO-236) packaging with identical pin configuration and footprint. PCB layout modifications are not required for substitution.

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

A: Tape & Reel (TR) packaging is supplied on continuous tape suitable for automated pick-and-place assembly. Cut Tape (CT) packaging is supplied as individual tape segments. Both formats use identical component specifications and footprints. Selection depends on manufacturing process requirements and volume.

Q: Can I substitute BAS29 for BAS19LT1?

A: BAS29 maintains the 120 V reverse voltage and 200 mA current ratings with SOT-23-3 packaging. However, BAS29 exhibits lower forward voltage (1.0 V @ 200 mA vs. 1.25 V) and reduced capacitance (2 pF vs. 5 pF @ 0V, 1MHz). Substitution is possible if these parameter differences are acceptable for the application.

Q: What inventory levels are available for the recommended substitutes?

A: BAS19LT1G: 355,400 units. BAS19LT3G: 48,712 units. NSVBAS19LT1G: 71,064 units. All three parts are available in sufficient quantities for production requirements.

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