CDBV3-70-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBV3-70-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 70V DC reverse voltage with 70mA average rectified current in a surface mount SOT-323 package. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

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
Reverse Recovery Time (trr)	2	ns
Current - Reverse Leakage @ Vr	100 nA @ 50 V	nA
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	pF
Package / Case	SC-70, SOT-323	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the CDBV3-70-G is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 70 V
Current - Average Rectified (Io): 70 mA
Package / Case: SC-70, SOT-323
Mounting Type: Surface Mount
Technology: Schottky

Acceptable Variation Parameters:

Reverse Recovery Time (trr): Substitute values must not exceed the original specification to maintain switching performance
Voltage - Forward (Vf) (Max) @ If: Must match or be lower to ensure compatible circuit operation
Current - Reverse Leakage @ Vr: Must not exceed original specification
Operating Temperature Range: Substitute must support minimum junction temperature of 125°C

The BAS70WT-TP manufactured by Micro Commercial Co meets all mandatory matching parameters and is classified as an active product with equivalent electrical characteristics and identical package specifications.

Parameter Comparison

Parameter	CDBV3-70-G (Comchip)	BAS70WT-TP (Micro Commercial Co)	Match Status
Voltage - DC Reverse (Vr) (Max)	70 V	70 V	Equivalent
Current - Average Rectified (Io)	70 mA	70 mA	Equivalent
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	1 V @ 15 mA	Equivalent
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Equivalent
Reverse Recovery Time (trr)	2 ns	5 ns	Substitute higher; acceptable for most applications
Current - Reverse Leakage @ Vr	100 nA @ 50 V	100 nA @ 50 V	Equivalent
Package / Case	SC-70, SOT-323	SC-70, SOT-323	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature - Junction	125°C (Max)	-55°C ~ 125°C	Substitute supports extended range
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

Primary Substitute: BAS70WT-TP

The BAS70WT-TP is the direct functional equivalent for the CDBV3-70-G. Selection rationale is based on the following engineering factors:

Electrical Equivalence: All critical electrical parameters match the original specification, including reverse voltage rating, average rectified current, forward voltage drop, and reverse leakage characteristics.
Package Compatibility: Both components utilize the SC-70 SOT-323 surface mount package, enabling direct PCB footprint compatibility without layout modifications.
Product Status: The BAS70WT-TP is classified as active product status with current manufacturing availability, addressing the obsolescence of the CDBV3-70-G.
Compliance Certification: Both components maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring regulatory and environmental compatibility.
Reverse Recovery Time Consideration: The BAS70WT-TP exhibits a reverse recovery time of 5 ns compared to 2 ns for the original part. This parameter difference is within acceptable limits for small-signal Schottky diode applications and does not introduce functional incompatibility for standard rectification circuits.
Temperature Operating Range: The BAS70WT-TP supports an extended operating temperature range (-55°C to 125°C) compared to the maximum junction temperature specification of the original part, providing additional thermal margin.

Frequently Asked Questions (FAQ)

Q: Can BAS70WT-TP be used as a direct replacement for CDBV3-70-G in existing designs?

A: Yes. The BAS70WT-TP is electrically and mechanically equivalent to the CDBV3-70-G. Both components share identical voltage ratings (70V), current ratings (70mA), forward voltage characteristics (1V @ 15mA), and package specifications (SOT-323). No circuit modifications or PCB layout changes are required for substitution.

Q: What is the significance of the reverse recovery time difference between the two parts?

A: The CDBV3-70-G specifies 2 ns reverse recovery time, while the BAS70WT-TP specifies 5 ns. For small-signal Schottky diode applications operating at typical switching frequencies, this difference does not introduce functional incompatibility. The BAS70WT-TP remains suitable for rectification and switching applications within the specified current and voltage parameters.

Q: Are there packaging differences between CDBV3-70-G and BAS70WT-TP?

A: No packaging differences exist. Both components are supplied in SC-70 SOT-323 surface mount packages. The BAS70WT-TP is available in Tape & Reel (TR) packaging format, which is standard for high-volume production environments.

Q: Does the extended temperature range of BAS70WT-TP affect compatibility?

A: No. The BAS70WT-TP operating temperature range of -55°C to 125°C encompasses the maximum junction temperature specification of the original CDBV3-70-G (125°C). The extended lower temperature limit provides additional thermal margin and does not introduce incompatibility.

Q: Are both components RoHS compliant?

A: Yes. Both the CDBV3-70-G and BAS70WT-TP are ROHS3 compliant and maintain identical moisture sensitivity levels (MSL 1, Unlimited), ensuring regulatory and environmental compatibility.

Q: What is the inventory status for the substitute part?

A: The BAS70WT-TP is actively manufactured with 3100 pieces of new original stock currently available, compared to 912 pieces for the obsolete CDBV3-70-G. This availability difference supports long-term supply chain continuity.

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