ACDBA240-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The ACDBA240-HF is an active Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 2A average rectified current in a surface mount DO-214AC (SMA) package. This component is designed for fast recovery applications requiring switching speeds of 500ns or less at currents exceeding 200mA. The part is AEC-Q101 qualified for automotive applications and maintains ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining package compatibility and required certifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	mV
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Package / Case	DO-214AC (SMA)	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the ACDBA240-HF is determined by the following mandatory criteria:

Electrical Parameters (Must Match or Exceed):

Voltage - DC Reverse (Vr) (Max): 40V minimum
Package / Case: DO-214AC (SMA) surface mount package
Technology: Schottky diode
Speed: Fast Recovery ≤ 500ns at currents > 200mA

Compatibility Criteria:

Current - Average Rectified (Io): Equal to or greater than 2A
Voltage - Forward (Vf): Within acceptable operating range for the application
Operating Temperature Range: Must support -55°C to 125°C minimum
Compliance: ROHS3 compliant, MSL 1 rating

Substitute Relationship Logic: A part qualifies as a substitute when it maintains identical reverse voltage rating, identical package form factor, and equal or superior current handling capability while preserving fast recovery characteristics and automotive-grade certifications.

Parameter Comparison

Parameter	ACDBA240-HF (Main Part)	SSA34-E3/61T (Substitute)	Compatibility
Manufacturer	Comchip Technology	Vishay General Semiconductor - Diodes Division	Different manufacturer
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	Match
Current - Average Rectified (Io)	2 A	3 A	Substitute exceeds requirement
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	490 mV @ 3 A	Substitute performs better
Speed - Fast Recovery	≤ 500ns, > 200mA	≤ 500ns, > 200mA	Match
Current - Reverse Leakage @ Vr	500 µA @ 40 V	200 µA @ 40 V	Substitute performs better
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	Match
Operating Temperature - Junction	-55°C to 125°C	-65°C to 150°C	Substitute exceeds range
Technology	Schottky	Schottky	Match
Mounting Type	Surface Mount	Surface Mount	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Match

Engineering Selection Recommendations

SSA34-E3/61T Substitution Basis:

The SSA34-E3/61T from Vishay General Semiconductor qualifies as a direct substitute for the ACDBA240-HF based on the following engineering criteria:

Electrical Equivalence: Both devices maintain identical 40V DC reverse voltage rating and DO-214AC surface mount package configuration, ensuring direct PCB compatibility without layout modification.
Current Capability: The SSA34-E3/61T provides 3A average rectified current, exceeding the 2A requirement of the ACDBA240-HF, allowing operation within the original design envelope with additional margin.
Performance Characteristics: Forward voltage drop at rated current is 490mV versus 500mV, representing improved efficiency. Reverse leakage current is reduced to 200µA from 500µA, indicating superior blocking characteristics.
Speed Performance: Both devices meet the fast recovery specification of ≤500ns at currents exceeding 200mA, maintaining switching performance requirements.
Compliance & Certification: The SSA34-E3/61T maintains ROHS3 compliance and MSL 1 rating. Operating temperature range extends to -65°C to 150°C, exceeding the -55°C to 125°C requirement.
Product Status: Both parts are active products with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can the SSA34-E3/61T be used as a direct replacement for ACDBA240-HF on existing PCBs?

A: Yes. Both devices use identical DO-214AC (SMA) surface mount packages with matching pin configurations and footprints. No PCB layout modification is required.

Q: What is the primary advantage of substituting with SSA34-E3/61T?

A: The SSA34-E3/61T provides superior electrical performance within the same package: 3A current capacity versus 2A, lower forward voltage drop (490mV vs 500mV), and reduced reverse leakage current (200µA vs 500µA). Extended operating temperature range (-65°C to 150°C) provides additional thermal margin.

Q: Are both parts automotive-grade qualified?

A: The ACDBA240-HF carries AEC-Q101 automotive qualification. The SSA34-E3/61T specifications provided do not explicitly list AEC-Q101 qualification. Verification of automotive qualification status for the SSA34-E3/61T is required for applications with automotive qualification mandates.

Q: What is the difference in packaging between these parts?

A: ACDBA240-HF is supplied in Tape & Reel (TR) format. SSA34-E3/61T is supplied in Cut Tape (CT) & Digi-Reel® format. Both formats are standard surface mount packaging; selection depends on assembly process requirements and volume.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. Both ACDBA240-HF and SSA34-E3/61T are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity) rating.

Q: What parameters must remain constant for substitution validity?

A: Reverse voltage rating (40V), package type (DO-214AC/SMA), technology (Schottky), and fast recovery speed (≤500ns) must remain constant. Current rating and forward voltage may improve in the substitute part without affecting circuit operation.

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