SSB44HE3/52T Equivalent & Substitute Parts

Part Overview

The SSB44HE3/52T is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 4 A average rectified current in a DO-214AA (SMB) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The SSB44HE3/52T features fast recovery characteristics (≤500 ns for currents >200 mA) and is compliant with RoHS3 and REACH regulations. Operating temperature range spans -65°C to 150°C junction temperature.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 4 A	mV
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	400	µA @ 40 V
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-65 to 150	°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SSB44HE3/52T are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Vishay SSB44 Series Equivalents

These parts share identical electrical specifications with the main part:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 4 A
Voltage - Forward (Vf) (Max) @ If: 490 mV @ 4 A
Speed: Fast Recovery ≤500 ns, >200 mA (Io)
Current - Reverse Leakage @ Vr: 400 µA @ 40 V
Package / Case: DO-214AA, SMB
Operating Temperature - Junction: -65°C to 150°C
RoHS Status: ROHS3 Compliant

Differences exist only in packaging format (Cut Tape vs. Tape & Reel) and automotive qualification status (AEC-Q101 for certain variants).

Category 2: Cross-Manufacturer Alternatives

These parts provide functional substitution with parameter variations:

B1100B-13-F (Diodes Incorporated): Higher voltage rating (100 V) and lower current rating (1 A)
SK34B-LTP (Micro Commercial Co): Matching voltage (40 V) with reduced current rating (3 A)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Status	Inventory [Pcs]
SSB44HE3/52T	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Discontinued	1950
SSB44HE3_A/H	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	29850
SSB44-E3/52T	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	56247
SSB44-E3/5BT	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	6685
SSB44-M3/52T	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	964
SSB44-M3/5BT	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	12284
SSB44HE3_A/I	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	8089
SSB44HM3_A/H	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	8239
SSB44HM3_A/I	Vishay	40	4	490 @ 4A	DO-214AA, SMB	Active	29950
B1100B-13-F	Diodes Inc	100	1	790 @ 1A	DO-214AA, SMB	Active	28100
SK34B-LTP	MCC	40	3	500 @ 3A	DO-214AA, SMB	Active	146400

Engineering Selection Recommendations

Primary Substitutes (Vishay SSB44 Series)

The following parts provide direct electrical and mechanical equivalence to SSB44HE3/52T:

SSB44HE3_A/H: Active status with highest inventory (29,850 pcs). Automotive-grade with AEC-Q101 qualification. Cut Tape packaging.
SSB44-E3/52T: Active status with largest inventory (56,247 pcs). Highest availability for volume procurement. Tape & Reel packaging.
SSB44HM3_A/I: Active status with high inventory (29,950 pcs). Automotive-grade with AEC-Q101 qualification. Cut Tape & Digi-Reel packaging.

All Vishay SSB44 series substitutes maintain identical electrical parameters and RoHS3 compliance. Selection among these variants depends on packaging requirements and automotive qualification necessity.

Secondary Alternatives (Cross-Manufacturer)

SK34B-LTP (Micro Commercial Co): Suitable for applications where 3 A current rating is acceptable. Maintains 40 V voltage rating. Highest inventory availability (146,400 pcs). Operating temperature range -55°C to 150°C (lower minimum than SSB44HE3/52T).
B1100B-13-F (Diodes Incorporated): Applicable only where circuit design permits 100 V voltage rating and 1 A current rating. Not recommended as direct substitute due to significant parameter derating.

Frequently Asked Questions (FAQ)

Q: Can SSB44HE3_A/H directly replace SSB44HE3/52T?

A: Yes. Both parts share identical electrical specifications (40 V, 4 A, 490 mV forward voltage). The difference is packaging format: SSB44HE3_A/H is supplied in Cut Tape, while SSB44HE3/52T was supplied in Tape & Reel. Both are RoHS3 compliant with MSL 1 rating.

Q: What is the difference between SSB44-E3/52T and SSB44-M3/52T?

A: Both parts have identical electrical parameters and package type (DO-214AA, SMB). The designation difference reflects internal Vishay product line variants. Both are active status with RoHS3 compliance. SSB44-E3/52T has significantly higher inventory (56,247 pcs vs. 964 pcs).

Q: Is SK34B-LTP a suitable replacement?

A: SK34B-LTP is a functional alternative only for circuits where 3 A current rating is sufficient. It maintains the 40 V voltage rating and DO-214AA package. However, it is not a direct equivalent due to reduced current capacity. Operating temperature minimum is -55°C (vs. -65°C for SSB44HE3/52T).

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this qualification (SSB44HE3_A/H, SSB44HE3_A/I, SSB44HM3_A/H, SSB44HM3_A/I) are approved for automotive applications. Non-qualified variants (SSB44-E3/52T, SSB44-E3/5BT, SSB44-M3/52T, SSB44-M3/5BT) are suitable for industrial and consumer applications.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT), Tape & Reel (TR), and Digi-Reel packaging formats do not affect electrical characteristics. Selection depends on assembly line equipment compatibility and procurement volume requirements.

Q: Why is B1100B-13-F listed as an alternative?

A: B1100B-13-F is provided as a cross-manufacturer option for applications where voltage derating to 100 V and current reduction to 1 A are acceptable. This part is not recommended as a direct substitute for standard 40 V, 4 A applications.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All parts in the substitute list maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SSB44HE3/52T specifications.

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