BAS70LT1 Equivalent & Substitute Parts

Part Overview

The BAS70LT1 is a Schottky diode rated for 70 V DC reverse voltage with 70 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 support and procurement continuity. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers, enabling seamless integration into existing designs or new applications requiring this diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	70	V
Current - Average Rectified (Io)	70	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	V @ mA
Current - Reverse Leakage @ Vr	10	µA @ 70 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Technology	Schottky	—
Speed	Small Signal ≤ 200mA (Io), Any Speed	—
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BAS70LT1 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 70 V
Current - Average Rectified (Io): 70 mA minimum
Voltage - Forward (Vf) (Max) @ If: 1 V @ 15 mA
Technology: Schottky
Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount

Grouping Logic:

Direct Equivalents maintain all electrical specifications and package configuration identical to the BAS70LT1. These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgrade Alternatives feature enhanced performance characteristics (lower reverse leakage current, faster reverse recovery time, improved temperature ratings) while maintaining the same voltage, current, and package specifications. These parts are suitable for direct replacement with potential performance benefits.

Higher Current Variants exceed the 70 mA current rating while maintaining 70 V reverse voltage and SOT-23-3 packaging. These parts are suitable for applications requiring additional current margin but are not required for designs specified to 70 mA.

Diode Array Configurations integrate multiple diodes in common anode, common cathode, or series connection topologies within the same SOT-23-3 package. These parts are suitable only for applications where the specific diode configuration matches the circuit topology.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	Reverse Leakage @ Vr [µA/nA]	Package	Product Status	RoHS Status
BAS70LT1	onsemi	70	70	1 @ 15	10 µA @ 70 V	SOT-23-3	Obsolete	Non-compliant
BAS70LT1G	onsemi	70	70	1 @ 15	10 µA @ 70 V	SOT-23-3	Active	ROHS3 Compliant
BAS70-TP	Micro Commercial Co	70	70	1 @ 15	200 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant
BAS70E6327HTSA1	Infineon Technologies	70	70	1 @ 15	100 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant
BAS70E6433HTMA1	Infineon Technologies	70	70	1 @ 15	100 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant
BAS70-00-E3-08	Vishay General Semiconductor - Diodes Division	70	200	1 @ 15	100 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant
BAS7006E6433HTMA1	Infineon Technologies	70	70 (per diode)	1 @ 15	100 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant
CDBT-70S-G	Comchip Technology	70	70 (per diode)	1 @ 15	100 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant
CDBT-70C-G	Comchip Technology	70	70 (per diode)	1 @ 15	100 nA @ 50 V	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation):

BAS70LT1G is the primary recommended substitute. This part is manufactured by onsemi, the original manufacturer of the BAS70LT1, and maintains identical electrical specifications and packaging. The transition from obsolete to active product status ensures long-term availability. RoHS3 compliance provides regulatory alignment for new designs and procurement cycles.

Alternative Direct Equivalents:

BAS70-TP (Micro Commercial Co), BAS70E6327HTSA1 (Infineon Technologies), and BAS70E6433HTMA1 (Infineon Technologies) are functionally equivalent alternatives with active product status and RoHS3 compliance. These parts maintain the 70 V / 70 mA specifications and SOT-23-3 package configuration. Selection among these alternatives is based on supplier availability, lead time, and procurement cost.

Higher Current Capability:

BAS70-00-E3-08 (Vishay General Semiconductor - Diodes Division) provides 200 mA average rectified current while maintaining 70 V reverse voltage and SOT-23-3 packaging. This part is suitable for applications requiring additional current margin beyond the 70 mA specification. Direct substitution is valid for designs where the 70 mA rating is not a limiting constraint.

Diode Array Configurations:

BAS7006E6433HTMA1 (Infineon Technologies, 1 Pair Common Anode), CDBT-70S-G (Comchip Technology, 1 Pair Series Connection), and CDBT-70C-G (Comchip Technology, 1 Pair Common Cathode) integrate dual diodes within the SOT-23-3 package. These parts are suitable only for circuit topologies requiring the specific diode configuration. Pin-level compatibility with single-diode designs is not guaranteed.

Compliance and Availability:

All recommended substitutes carry active product status and RoHS3 compliance certification. The BAS70LT1 is RoHS non-compliant; transition to compliant alternatives is necessary for designs subject to RoHS regulations or customer requirements. Inventory levels across all active alternatives exceed 700 units, ensuring procurement continuity.

Frequently Asked Questions (FAQ)

Q: Can BAS70LT1G be used as a direct replacement for BAS70LT1?

A: Yes. BAS70LT1G is manufactured by onsemi and maintains identical electrical specifications (70 V reverse voltage, 70 mA average rectified current, 1 V forward voltage at 15 mA) and SOT-23-3 packaging. The primary difference is product status (active versus obsolete) and RoHS3 compliance. No circuit modification is required.

Q: What is the difference between BAS70-TP and BAS70E6327HTSA1?

A: Both parts maintain 70 V / 70 mA specifications and SOT-23-3 packaging. BAS70-TP is manufactured by Micro Commercial Co with reverse leakage of 200 nA @ 50 V and operating temperature range of -55°C to 125°C. BAS70E6327HTSA1 is manufactured by Infineon Technologies with reverse leakage of 100 nA @ 50 V and the same operating temperature range. The lower reverse leakage in the Infineon part represents improved performance. Both are RoHS3 compliant and active products.

Q: Is BAS70-00-E3-08 compatible with designs specified for BAS70LT1?

A: BAS70-00-E3-08 is electrically compatible for direct substitution. This part maintains 70 V reverse voltage, 1 V forward voltage at 15 mA, and SOT-23-3 packaging. The current rating is 200 mA, which exceeds the 70 mA specification of BAS70LT1. For applications where the circuit is designed for 70 mA operation, the higher current rating does not create incompatibility; the part will operate within its specified limits. No circuit modification is required.

Q: Can diode array parts (BAS7006E6433HTMA1, CDBT-70S-G, CDBT-70C-G) replace single-diode BAS70LT1?

A: Diode array parts are not suitable for direct replacement in single-diode circuits. These parts integrate two diodes in specific configurations (common anode, series connection, or common cathode) within the SOT-23-3 package. Pin assignments differ from single-diode parts. Substitution requires circuit redesign to accommodate the diode array topology. Use these parts only in applications where the specific diode configuration matches the circuit requirements.

Q: What is the significance of the reverse leakage current difference between BAS70LT1 (10 µA @ 70 V) and active alternatives (100 nA @ 50 V)?

A: The BAS70LT1 specifies reverse leakage at 70 V, while active alternatives specify at 50 V. Direct comparison at identical voltage and temperature conditions is not provided in the available data. The lower absolute value in active alternatives (100 nA) indicates improved leakage performance at the specified test condition. For applications sensitive to reverse leakage, verification at the actual operating voltage and temperature is necessary using manufacturer datasheets.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All active substitute parts listed (BAS70LT1G, BAS70-TP, BAS70E6327HTSA1, BAS70E6433HTMA1, BAS70-00-E3-08, BAS7006E6433HTMA1, CDBT-70S-G, CDBT-70C-G) carry RoHS3 compliance certification. The original BAS70LT1 is RoHS non-compliant. Transition to compliant alternatives is required for designs subject to RoHS regulations.

Q: What packaging options are available for BAS70 series diodes?

A: All recommended substitutes are supplied in SOT-23-3 (TO-236, SC-59) surface mount packaging. This package is consistent across single-diode and diode array configurations. Tape & Reel (TR) packaging is standard for active products, enabling automated assembly processes. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture control requirements during storage or handling.

Q: Which substitute offers the best performance improvement over BAS70LT1?

A: BAS70E6327HTSA1 and BAS70E6433HTMA1 (both Infineon Technologies) offer improved reverse leakage (100 nA @ 50 V versus 10 µA @ 70 V in BAS70LT1) and faster reverse recovery time (100 ps). These improvements are relevant for high-frequency switching applications and low-leakage circuit designs. For standard rectification applications, performance differences are negligible. Selection should be based on application requirements and supplier availability.

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