SSB44 R5G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SSB44 R5G is a 40V, 4A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AA (SMB) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity. The part operates across a junction temperature range of -55°C to 150°C and maintains RoHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 4 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200 µA @ 40 V	µA @ V
Capacitance @ Vr, F	235 pF @ 4V, 1MHz	pF @ V, MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SSB44 R5G requires matching of critical electrical parameters that define functional equivalence in Schottky rectifier applications. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage rating (40V DC reverse voltage minimum)
Current capacity (4A average rectified current minimum)
Forward voltage characteristics (500 mV @ rated current or lower)
Fast recovery speed classification (≤ 500ns, > 200mA)
Package compatibility (DO-214AA/SMB surface mount)
Temperature operating range (-55°C to 150°C minimum)

Substitution Logic:

Parts with current ratings below 4A (1A, 2A, 3A) are classified as partial substitutes suitable only for applications with reduced current requirements. These parts maintain the 40V voltage rating, fast recovery speed, and DO-214AA package format but cannot directly replace the SSB44 R5G in 4A-rated circuits.

Parts with current ratings at or above 4A are classified as direct substitutes when all other parameters align. No direct 4A or higher-rated alternatives appear in the provided substitute list; therefore, the highest-rated alternatives (3A devices) represent the closest available options for current-limited applications.

Package variants (SMA vs. SMB) introduce mechanical incompatibility and are noted separately despite electrical equivalence.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io A	Vf (Max) mV @ If	Speed	Ir @ Vr µA @ V	Package	Temp Range °C	RoHS Status	Product Status
SSB44 R5G	Taiwan Semiconductor	40	4	500 @ 4A	Fast Recovery ≤ 500ns	200 @ 40V	DO-214AA (SMB)	-55 to 150	ROHS3	Discontinued
5819SMJ/TR13	Microchip Technology	40	1	550 @ 1A	Fast Recovery ≤ 500ns	1000 @ 40V	DO-214AA (SMB)	-55 to 150	Non-compliant	Active
B140BQ-13-F	Diodes Incorporated	40	1	500 @ 1A	Fast Recovery ≤ 500ns	500 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active
B240-13-F	Diodes Incorporated	40	2	500 @ 2A	Fast Recovery ≤ 500ns	500 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	Fast Recovery ≤ 500ns	500 @ 40V	DO-214AC (SMA)	-65 to 150	ROHS3	Active
B240Q-13-F	Diodes Incorporated	40	2	500 @ 2A	Fast Recovery ≤ 500ns	500 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active
B340BQ-13-F	Diodes Incorporated	40	3	500 @ 3A	Fast Recovery ≤ 500ns	500 @ 40V	DO-214AA (SMB)	-55 to 150	ROHS3	Active
B340LB-E3/52T	Vishay General Semiconductor	40	3	450 @ 3A	Fast Recovery ≤ 500ns	400 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active
B340LB-E3/5BT	Vishay General Semiconductor	40	3	450 @ 3A	Fast Recovery ≤ 500ns	400 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active
B340LB-M3/52T	Vishay General Semiconductor	40	3	450 @ 3A	Fast Recovery ≤ 500ns	400 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active
B340LB-M3/5BT	Vishay General Semiconductor	40	3	450 @ 3A	Fast Recovery ≤ 500ns	400 @ 40V	DO-214AA (SMB)	-65 to 150	ROHS3	Active

Engineering Selection Recommendations

Current Capacity Considerations:

The SSB44 R5G operates at 4A average rectified current. No substitute parts in the provided list match this current rating. The highest-rated alternatives are 3A devices, representing a 25% reduction in current capacity. Selection of 3A alternatives is appropriate only for applications where circuit design permits operation at reduced current levels or where the actual operating current does not exceed 3A.

Voltage and Speed Alignment:

All listed substitute parts maintain the 40V DC reverse voltage rating and fast recovery speed classification (≤ 500ns, > 200mA), ensuring compatibility with circuits designed for the SSB44 R5G voltage and switching characteristics.

Compliance and Product Status:

All substitute parts listed are active products with RoHS3 compliance, providing supply continuity and regulatory alignment. The SSB44 R5G discontinuation status necessitates transition to active alternatives.

Temperature Range:

The SSB44 R5G operates from -55°C to 150°C. Most substitute parts extend the lower temperature limit to -65°C, providing enhanced cold-temperature performance. The B140BQ-13-F and B340BQ-13-F maintain the -55°C lower limit, matching the original specification.

Package Compatibility:

B240A-13-F uses DO-214AC (SMA) package, which is mechanically incompatible with DO-214AA (SMB) footprints. This part is electrically equivalent but requires PCB redesign for implementation.

Forward Voltage Characteristics:

Vishay B340 series devices (B340LB variants) exhibit lower forward voltage (450 mV @ 3A) compared to the SSB44 R5G (500 mV @ 4A), resulting in reduced power dissipation in equivalent current applications.

Recommended Substitution Path:

For applications operating at or below 3A: B340LB-E3/52T, B340LB-E3/5BT, B340LB-M3/52T, or B340LB-M3/5BT (Vishay) provide the closest electrical match with active product status and superior forward voltage performance.

For applications requiring 2A operation: B240-13-F or B240Q-13-F (Diodes Incorporated) offer active status and full RoHS3 compliance.

For applications requiring 1A operation: B140BQ-13-F (Diodes Incorporated) provides automotive-grade qualification (AEC-Q101) with active status.

Frequently Asked Questions (FAQ)

Q: Can the SSB44 R5G be directly replaced with a 3A-rated device?

A: Direct replacement is possible only if the circuit design operates at or below 3A average rectified current. The 3A rating represents the maximum current capacity of substitute devices; operation at higher currents will exceed device specifications. Circuit analysis must confirm that actual operating current does not exceed 3A.

Q: What is the significance of the DO-214AA (SMB) package designation?

A: DO-214AA and SMB refer to the same surface mount package format. All substitute parts except B240A-13-F use this package, ensuring mechanical and thermal compatibility with existing PCB layouts designed for the SSB44 R5G. The B240A-13-F uses DO-214AC (SMA) package, which has different footprint dimensions and requires PCB modification.

Q: Are there electrical differences between Diodes Incorporated and Vishay alternatives?

A: Both manufacturers provide 40V, 3A Schottky diodes with fast recovery characteristics. Vishay B340LB series devices exhibit lower forward voltage (450 mV @ 3A) compared to Diodes Incorporated B340BQ-13-F (500 mV @ 3A), resulting in approximately 50 mV lower voltage drop. This difference reduces power dissipation in high-current applications.

Q: Why is the 5819SMJ/TR13 from Microchip listed as non-RoHS compliant?

A: The 5819SMJ/TR13 is identified as RoHS non-compliant in the provided specifications. Applications requiring RoHS3 compliance must select alternatives such as B140BQ-13-F, B240 series, or B340 series devices from Diodes Incorporated or Vishay, all of which carry ROHS3 Compliant status.

Q: What is the difference between cut tape (CT) and tape & reel (TR) packaging?

A: Cut tape packaging supplies individual components on carrier tape suitable for manual or small-scale assembly. Tape & reel packaging supplies components on continuous reel format optimized for high-volume automated assembly. Both formats contain identical components; packaging selection depends on production volume and assembly equipment compatibility.

Q: Can B240A-13-F (SMA package) be used as a substitute despite package differences?

A: B240A-13-F is electrically equivalent but mechanically incompatible with SSB44 R5G applications. The SMA package has different footprint dimensions than SMB. Implementation requires PCB redesign and re-qualification of thermal and electrical performance. Use only if PCB modification is feasible.

Q: How do automotive-grade qualifications (AEC-Q101) affect substitution decisions?

A: AEC-Q101 qualification indicates the device meets automotive industry reliability and quality standards. B140BQ-13-F and B240Q-13-F carry AEC-Q101 qualification, making them suitable for automotive applications. Non-qualified alternatives may not meet automotive supply chain requirements.

Q: What is the impact of reverse leakage current differences between substitutes?

A: The SSB44 R5G specifies 200 µA reverse leakage @ 40V. Substitute parts range from 400 µA to 1000 µA. Higher reverse leakage increases standby power consumption and heat generation. For applications sensitive to leakage current, Vishay B340LB series (400 µA) provides the closest match to the original specification.

Q: Are there current rating limitations when substituting with lower-rated devices?

A: Yes. Devices rated below 4A cannot safely conduct 4A continuous current. Operating a 3A device at 4A exceeds its maximum rating, causing excessive heat generation, reduced reliability, and potential device failure. Circuit redesign or current limiting is required when using lower-rated substitutes.

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