SS29 M4G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS29 M4G is a 90V, 2A 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 support and procurement. The part operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH regulations. Substitute parts must maintain electrical compatibility across reverse voltage, forward current, and thermal specifications while accommodating surface mount assembly requirements.

Key Parameters

Parameter	SS29 M4G Specification
Voltage - DC Reverse (Vr) (Max)	90 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 90 V
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SS29 M4G is determined by the following critical parameters:

Primary Matching Criteria:

Reverse voltage rating: 90 V (exact match required)
Average rectified current: 2 A (exact match required for full-load equivalence)
Package type: DO-214AA / SMB (surface mount compatibility)
Technology: Schottky diode (fast recovery characteristics)
Fast recovery speed: ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Forward voltage drop (Vf): Acceptable range 790 mV to 850 mV @ 2 A
Reverse leakage current: Acceptable range 7 µA to 100 µA @ 90 V
Operating temperature range: Minimum -55°C to 150°C (or extended range)
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories: Direct Equivalents (matching 2A current rating) and Reduced-Current Alternatives (1.5A or 1A ratings for lower-power applications).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Temp Range (°C)	Product Status	Package
SS29 M4G	Taiwan Semiconductor	90 V	2 A	850 mV @ 2 A	100 µA @ 90 V	-55 ~ 150	Discontinued	DO-214AA (SMB)
SS2H9-E3/5BT	Vishay General Semiconductor	90 V	2 A	790 mV @ 2 A	10 µA @ 90 V	-65 ~ 175	Active	DO-214AA (SMB)
SS2H9-E3/52T	Vishay General Semiconductor	90 V	2 A	790 mV @ 2 A	10 µA @ 90 V	-65 ~ 175	Active	DO-214AA (SMB)
B290-13-F	Diodes Incorporated	90 V	2 A	790 mV @ 2 A	7 µA @ 90 V	-65 ~ 150	Active	DO-214AA (SMB)
B290Q-13-F	Diodes Incorporated	90 V	2 A	790 mV @ 2 A	7 µA @ 90 V	-65 ~ 150	Active	DO-214AA (SMB)
SS29	Taiwan Semiconductor	90 V	2 A	850 mV @ 2 A	100 µA @ 90 V	-55 ~ 150	Active	DO-214AA (SMB)
SS29-E3/52T	Vishay General Semiconductor	90 V	1.5 A	750 mV @ 1 A	30 µA @ 90 V	-55 ~ 150	Active	DO-214AA (SMB)
SS29-E3/5BT	Vishay General Semiconductor	90 V	1.5 A	750 mV @ 1 A	30 µA @ 90 V	-55 ~ 150	Active	DO-214AA (SMB)
SS29-M3/52T	Vishay General Semiconductor	90 V	1.5 A	750 mV @ 1 A	30 µA @ 90 V	-55 ~ 150	Active	DO-214AA (SMB)
SS29-M3/5BT	Vishay General Semiconductor	90 V	1.5 A	950 mV @ 3 A	30 µA @ 90 V	-55 ~ 150	Active	DO-214AA (SMB)
B190BQ-13-F	Diodes Incorporated	90 V	1 A	790 mV @ 1 A	500 µA @ 90 V	-65 ~ 150	Active	DO-214AA (SMB)

Engineering Selection Recommendations

Direct Equivalents (2A Rating - Recommended for SS29 M4G Replacement):

The following parts provide full electrical equivalence at the 2A current rating and are recommended as primary substitutes:

SS2H9-E3/5BT and SS2H9-E3/52T (Vishay General Semiconductor): Both parts match the 90V reverse voltage and 2A current specifications. Forward voltage is reduced to 790 mV @ 2 A compared to the original 850 mV, resulting in lower power dissipation. Operating temperature range extends to -65°C to 175°C, providing enhanced thermal margin. Product status is Active with full RoHS3 compliance. Packaging options include Tape & Reel (TR) for automated assembly.
B290-13-F and B290Q-13-F (Diodes Incorporated): Both parts provide 90V / 2A specifications with 790 mV forward voltage. Reverse leakage is significantly lower at 7 µA @ 90 V. B290Q-13-F includes automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel packaging. B290-13-F is available in Cut Tape (CT) & Digi-Reel® format. Both are Active status with RoHS3 compliance.
SS29 (Taiwan Semiconductor): This is the active production variant of the discontinued SS29 M4G. Electrical specifications are identical, including 850 mV forward voltage and 100 µA reverse leakage. Operating temperature range is -55°C to 150°C. This part provides the closest functional match with the same manufacturer baseline.

Reduced-Current Alternatives (1.5A Rating - For Lower-Power Applications):

The following parts are suitable for applications where the full 2A current is not required:

SS29-E3/52T, SS29-E3/5BT, SS29-M3/52T, and SS29-M3/5BT (Vishay General Semiconductor): All four parts are rated at 1.5A average rectified current with 90V reverse voltage. Forward voltage is 750 mV @ 1 A (or 950 mV @ 3 A for the M3/5BT variant). Reverse leakage is 30 µA @ 90 V. Operating temperature range is -55°C to 150°C. All are Active status with RoHS3 compliance and Tape & Reel packaging.

Lower-Current Alternative (1A Rating - For Minimal-Power Applications):

B190BQ-13-F (Diodes Incorporated): Rated at 1A average rectified current with 90V reverse voltage and 790 mV forward voltage @ 1 A. Includes automotive-grade qualification (AEC-Q101). Operating temperature range is -65°C to 150°C. Product status is Active with RoHS3 compliance and Tape & Reel packaging. Reverse leakage is 500 µA @ 90 V, which is higher than other alternatives.

Selection Criteria by Application:

For direct replacement in existing designs: Select SS29 (same manufacturer) or SS2H9-E3/5BT (improved thermal performance).
For automotive applications: Select B290Q-13-F or B190BQ-13-F (AEC-Q101 qualified).
For extended temperature operation: Select SS2H9-E3/5BT or SS2H9-E3/52T (-65°C to 175°C range).
For reduced power dissipation: Select B290-13-F or B290Q-13-F (790 mV forward voltage).
For lower current requirements: Select SS29-E3/52T, SS29-E3/5BT, SS29-M3/52T, SS29-M3/5BT (1.5A), or B190BQ-13-F (1A).

Frequently Asked Questions (FAQ)

Q: Can I use a 1.5A or 1A rated diode as a substitute for the SS29 M4G (2A)?

A: Reduced-current alternatives may be used only if the application circuit operates at or below the lower current rating. The SS29 M4G is rated for 2A average rectified current. Using a 1.5A or 1A part in a 2A application will result in component overstress and potential failure. Verify actual circuit current requirements before selecting a lower-rated substitute.

Q: What is the difference between SS2H9-E3/5BT and SS2H9-E3/52T?

A: Both parts are electrically identical with 90V / 2A specifications and 790 mV forward voltage. The difference is in packaging designation. Both are supplied in Tape & Reel (TR) format for automated assembly. Consult the supplier datasheet for specific reel configuration details.

Q: Why do some substitutes have lower reverse leakage current (7 µA) compared to the original (100 µA)?

A: Lower reverse leakage current indicates improved semiconductor junction quality and manufacturing process. This is a beneficial characteristic that reduces standby power consumption and heat generation. Parts with lower leakage are direct functional improvements over the original specification.

Q: Is the B290Q-13-F suitable for automotive applications?

A: Yes. The B290Q-13-F carries automotive-grade qualification (AEC-Q101), making it suitable for automotive and harsh-environment applications. The B190BQ-13-F also carries AEC-Q101 qualification for 1A applications.

Q: Can I substitute the SS29 M4G with the active SS29 part?

A: Yes. The SS29 (active production part) is electrically and mechanically identical to the SS29 M4G. Both are manufactured by Taiwan Semiconductor Corporation with identical 90V / 2A specifications, 850 mV forward voltage, and DO-214AA (SMB) packaging. The SS29 is the recommended direct replacement.

Q: What is the significance of the operating temperature range difference (-55°C to 150°C vs. -65°C to 175°C)?

A: The extended temperature range (-65°C to 175°C) of parts like SS2H9-E3/5BT provides greater thermal margin for high-temperature environments and cold-start conditions. If the application operates within the original -55°C to 150°C range, either specification is acceptable. Extended range parts offer additional design flexibility without performance penalty.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant and REACH unaffected, matching the compliance status of the original SS29 M4G.

Q: What packaging formats are available for these substitutes?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR) for automated pick-and-place assembly, Cut Tape (CT) for manual or semi-automated assembly, and Digi-Reel® format. Verify packaging availability with the supplier for your specific assembly process requirements.

Q: Can forward voltage differences (790 mV vs. 850 mV) affect circuit performance?

A: Forward voltage differences of 60 mV are within typical design tolerance for rectifier applications. Lower forward voltage (790 mV) results in reduced power dissipation and heat generation, which is beneficial. If the circuit design is sensitive to forward voltage, verify compatibility through circuit simulation or prototype testing. Most applications tolerate this variation without modification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message