CDBT-40-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBT-40-G is a 40V, 200mA Schottky rectifier diode manufactured by Comchip Technology in SOT-23-3 surface mount packaging. This component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). The CDBT-40-G serves as a general-purpose Schottky diode for low-voltage rectification, switching, and protection applications requiring fast recovery characteristics and minimal forward voltage drop.

Equivalent substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility across multiple qualified suppliers is required. All substitute parts listed maintain identical electrical performance parameters and mechanical compatibility with the original CDBT-40-G specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) Maximum @ If	1 V @ 40 mA	V @ mA
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	200	nA @ 30 V
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Operating Temperature - Junction Maximum	125	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CDBT-40-G is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) Maximum: 40 V
Current - Average Rectified (Io): 200 mA
Voltage - Forward (Vf) Maximum @ If: 1 V @ 40 mA
Reverse Recovery Time (trr): 5 ns
Technology: Schottky

Mechanical & Environmental Equivalence Criteria:

Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount
Supplier Device Package: SOT-23-3
Operating Temperature - Junction Maximum: 125°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed below meet these criteria without exception. Reverse leakage current and capacitance variations within the specified ranges do not affect functional substitution.

Parameter Comparison

Parameter	CDBT-40-G (Comchip)	BAS40-00-E3-08 (Vishay)	BAS40-00-E3-18 (Vishay)	BAS40-00-G3-08 (Vishay)	BAS40-00-HE3-08 (Vishay)
Manufacturer	Comchip Technology	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) Max	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) Max @ If	1 V @ 40 mA	1 V @ 40 mA	1 V @ 40 mA	1 V @ 40 mA	1 V @ 40 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns	5 ns	5 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Operating Temperature - Junction Max	125°C	125°C	125°C	125°C	125°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Last Time Buy
Grade	Standard	Standard	Standard	Standard	Automotive
Qualification	—	—	—	—	AEC-Q101

Engineering Selection Recommendations

Primary Selection (Active Status, Standard Grade):

BAS40-00-G3-08 is the recommended substitute for general-purpose applications. This part maintains Active product status with the highest available inventory (39,662 pcs), ensuring supply continuity and long-term availability. All electrical and mechanical parameters are identical to the CDBT-40-G.

Alternative Selection (Active Status, Standard Grade):

BAS40-00-E3-08 and BAS40-00-E3-18 are functionally equivalent alternatives with Active product status. Both parts are available in substantial quantities (1,572 pcs and 3,300 pcs respectively) and provide identical electrical performance.

Specialized Selection (Automotive Applications):

BAS40-00-HE3-08 is qualified to AEC-Q101 automotive standard and carries Automotive grade designation. This part is appropriate for automotive and high-reliability applications requiring automotive qualification. Note that BAS40-00-HE3-08 is designated Last Time Buy, indicating this part will be discontinued. Inventory is currently available at 107,200 pcs.

Compliance & Regulatory:

All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0070, matching the regulatory profile of the CDBT-40-G.

Frequently Asked Questions (FAQ)

Q: Can BAS40-00-G3-08 be used as a direct replacement for CDBT-40-G in existing designs?

A: Yes. BAS40-00-G3-08 is a parametric equivalent with identical electrical specifications (40V reverse voltage, 200mA average rectified current, 1V forward voltage @ 40mA, 5ns reverse recovery time) and identical mechanical packaging (SOT-23-3 surface mount). No circuit modifications are required.

Q: What is the difference between the Vishay BAS40 variants (E3-08, E3-18, G3-08, HE3-08)?

A: All four Vishay variants share identical electrical and mechanical specifications. The differences are in manufacturing date codes, packaging reels, and product status. BAS40-00-HE3-08 includes automotive qualification (AEC-Q101) and is designated Last Time Buy. For new designs, BAS40-00-G3-08 is recommended due to Active status and highest inventory.

Q: Is the reverse leakage current difference (200 nA vs. 100 nA) significant for substitution?

A: No. The CDBT-40-G specifies 200 nA maximum reverse leakage at 30V. All Vishay substitutes specify 100 nA maximum, which is within acceptable tolerance and represents improved performance. This variation does not affect functional compatibility.

Q: Can I use BAS40-00-HE3-08 in non-automotive applications?

A: Yes. BAS40-00-HE3-08 meets all electrical and mechanical requirements for standard applications. The automotive qualification is an additional certification that does not restrict use in general-purpose circuits. However, note that this part is Last Time Buy status.

Q: Are there any PCB layout or soldering considerations when substituting these parts?

A: No. All substitute parts use identical SOT-23-3 package geometry (TO-236-3, SC-59). PCB footprints, pad layouts, and soldering profiles remain unchanged. Standard surface mount assembly processes apply without modification.

Q: Which substitute part should I select for long-term supply security?

A: BAS40-00-G3-08 is the optimal choice for supply security. It maintains Active product status with the highest inventory level (39,662 pcs) among all substitutes, ensuring availability for future production runs and design revisions.

Q: Is RoHS3 compliance maintained across all substitute parts?

A: Yes. All substitute parts listed (BAS40-00-E3-08, BAS40-00-E3-18, BAS40-00-G3-08, BAS40-00-HE3-08) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the CDBT-40-G environmental classification.

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