ESH3B M6G Equivalent & Substitute Parts

Part Overview

The ESH3B M6G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. The part exhibits fast recovery characteristics with a 20 ns reverse recovery time, making it suitable for applications requiring rapid switching performance.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 3 A	mV
Reverse Recovery Time (trr)	20	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55°C ~ 175°C	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ESH3B M6G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Package / Case: Must be DO-214AB (SMC) or compatible surface mount package
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must accommodate the application's thermal requirements

Secondary Compatibility Factors:

Voltage - Forward (Vf): Forward voltage drop affects circuit efficiency and thermal performance
Reverse Recovery Time (trr): Affects switching speed and electromagnetic interference characteristics
Current - Reverse Leakage: Influences standby power consumption and circuit reliability

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with identical or superior electrical performance) and Functional Alternatives (meeting primary criteria with acceptable variations in secondary parameters).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
ESH3B M6G	Taiwan Semiconductor Corporation	100	3	900 @ 3A	20	5 @ 100V	DO-214AB (SMC)	-55 ~ 175	Discontinued
ES3B-13-F	Diodes Incorporated	100	3	900 @ 3A	25	10 @ 100V	DO-214AB (SMC)	-55 ~ 150	Active
RS3B-13-F	Diodes Incorporated	100	3	1300 @ 3A	150	5 @ 100V	DO-214AB (SMC)	-65 ~ 150	Active
S3B-13-F	Diodes Incorporated	100	3	1150 @ 3A	—	10 @ 100V	DO-214AB (SMC)	-65 ~ 150	Active
S3B-TP	Micro Commercial Co	100	3	1200 @ 3A	—	10 @ 100V	DO-214AB (SMC)	-55 ~ 150	Not For New Designs
ES3BB-13-F	Diodes Incorporated	100	3	900 @ 3A	25	10 @ 100V	DO-214AA (SMB)	-55 ~ 150	Active
RS3BB-13-F	Diodes Incorporated	100	3	1300 @ 3A	150	5 @ 100V	DO-214AA (SMB)	-65 ~ 150	Active
S3BB-13-F	Diodes Incorporated	100	3	1150 @ 3A	—	10 @ 100V	DO-214AA (SMB)	-65 ~ 150	Active
CGRC502-G	Comchip Technology	100	5	1150 @ 5A	—	10 @ 100V	DO-214AB (SMC)	—	Active
S5BC-13-F	Diodes Incorporated	100	5	1150 @ 5A	—	10 @ 100V	DO-214AB (SMC)	-65 ~ 150	Active
U3B-E3/57T	Vishay General Semiconductor - Diodes Division	100	2	900 @ 3A	20	10 @ 100V	DO-214AB (SMC)	-55 ~ 150	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement):

The ES3B-13-F from Diodes Incorporated is the primary recommended substitute. It matches the ESH3B M6G in voltage rating (100 V), current rating (3 A), forward voltage (900 mV @ 3 A), and package format (DO-214AB SMC). The part is in Active product status with ROHS3 compliance and unlimited moisture sensitivity level. The reverse recovery time of 25 ns is marginally longer than the original 20 ns, representing a negligible performance difference for general-purpose rectification applications. Operating temperature range is -55°C to 150°C, which covers most industrial and commercial applications, though the original part extends to 175°C.

Alternative Equivalents (Package Variants):

The ES3BB-13-F provides identical electrical specifications to ES3B-13-F but in a DO-214AA (SMB) package instead of DO-214AB (SMC). This substitute is suitable only if the PCB layout accommodates the SMB package footprint. The SMB package is physically larger than SMC and requires different land pattern design.

Functional Alternatives (Higher Current Rating):

The CGRC502-G and S5BC-13-F both provide 5 A current rating at 100 V reverse voltage, exceeding the 3 A requirement of the ESH3B M6G. These parts are suitable for applications where design margin or future current requirements justify the higher rating. Both maintain the DO-214AB (SMC) package format. Forward voltage is 1150 mV @ 5 A, which is higher than the original part's 900 mV @ 3 A specification.

Conditional Alternatives (Extended Temperature Range):

The RS3B-13-F and RS3BB-13-F from Diodes Incorporated extend the operating temperature range to -65°C to 150°C, providing enhanced low-temperature performance. However, these parts exhibit higher forward voltage (1300 mV @ 3 A) and significantly longer reverse recovery time (150 ns), which may affect circuit efficiency and switching characteristics. These parts are suitable only when extended low-temperature operation is a design requirement.

Not Recommended for New Designs:

The S3B-TP from Micro Commercial Co carries a "Not For New Designs" product status designation, indicating manufacturer discontinuation or obsolescence planning. This part should not be selected for new product development.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the original ESH3B M6G certifications. All parts carry ECCN EAR99 and HTSUS 8541.10.0080 classifications. Moisture Sensitivity Level is 1 (Unlimited) across all substitutes.

Frequently Asked Questions (FAQ)

Q: Can ES3B-13-F directly replace ESH3B M6G without PCB modification?

A: Yes. The ES3B-13-F is electrically and mechanically compatible with the ESH3B M6G. Both use the DO-214AB (SMC) package with identical footprint and pinout. No PCB layout changes are required for substitution.

Q: What is the significance of the 5 ns difference in reverse recovery time between ESH3B M6G (20 ns) and ES3B-13-F (25 ns)?

A: The 5 ns difference is negligible for general-purpose rectification applications. Reverse recovery time affects switching speed and electromagnetic interference generation. In most power supply and rectification circuits operating at standard frequencies (50-60 Hz or low-frequency switching), this difference produces no measurable performance impact. Applications with high-frequency switching (>100 kHz) may require evaluation of specific circuit behavior.

Q: Why do some substitute parts have higher forward voltage specifications?

A: Forward voltage varies with semiconductor manufacturing process, doping profiles, and junction design. Parts like S3B-13-F (1150 mV) and RS3B-13-F (1300 mV) use different semiconductor technology than the ESH3B M6G (900 mV). Higher forward voltage increases power dissipation and heat generation. Selection should consider thermal design and efficiency requirements of the application.

Q: Can I use CGRC502-G or S5BC-13-F (5 A rated) in place of ESH3B M6G (3 A rated)?

A: Yes, from an electrical compatibility standpoint. The 5 A rating provides design margin and allows for future current requirement increases. However, the higher current rating does not improve performance at 3 A operation. The primary trade-off is higher forward voltage (1150 mV @ 5 A versus 900 mV @ 3 A), which increases power dissipation. Use 5 A rated parts only when design margin or future scalability justifies the efficiency penalty.

Q: What is the difference between DO-214AB (SMC) and DO-214AA (SMB) packages?

A: DO-214AB (SMC) and DO-214AA (SMB) are different surface mount package outlines with different physical dimensions and PCB footprints. SMC is smaller than SMB. Parts like ES3BB-13-F and RS3BB-13-F use the SMB package and cannot be substituted for SMC-packaged parts without PCB redesign. Verify PCB land pattern compatibility before selecting SMB alternatives.

Q: Why is the operating temperature range of ES3B-13-F (-55°C to 150°C) lower than ESH3B M6G (-55°C to 175°C)?

A: Operating temperature range is determined by semiconductor junction design and packaging thermal characteristics. The ESH3B M6G supports operation to 175°C, while ES3B-13-F is rated to 150°C. For applications requiring operation above 150°C, the ESH3B M6G or RS3B-13-F (which extends to -65°C minimum) should be evaluated. Most commercial and industrial applications operate within the -55°C to 150°C range covered by ES3B-13-F.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original ESH3B M6G. All parts are also REACH Unaffected, indicating no conflict with REACH restricted substance regulations.

Q: What does "Not For New Designs" mean for S3B-TP?

A: "Not For New Designs" is a manufacturer product status indicating that the part is in end-of-life phase or has been superseded by newer alternatives. While S3B-TP may still be available in inventory, manufacturers recommend against selecting this part for new product development. Use S3B-13-F or other Active-status alternatives instead.

Q: How do I determine which substitute is best for my application?

A: Selection depends on three factors: (1) Package compatibility—verify PCB footprint matches DO-214AB (SMC) unless redesign is acceptable; (2) Electrical requirements—confirm voltage and current ratings meet or exceed application needs; (3) Operating conditions—verify temperature range, forward voltage dissipation, and switching speed requirements. For most applications, ES3B-13-F is the optimal choice due to Active product status, electrical equivalence, and widespread availability.

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