CEFB104-G Equivalent & Substitute Parts

Part Overview

The CEFB104-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The diode features fast recovery characteristics with a reverse recovery time of 35 ns and operates at a maximum junction temperature of 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction (Max)	150	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the CEFB104-G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V (exact match required)
Current - Average Rectified (Io): 1 A (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: DO-214AA or SMB (exact match required)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.6 V @ 1 A (allowable variance for circuit operation)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (preferred for equivalent performance)
Reverse Recovery Time (trr): ≤ 50 ns (preferred for equivalent switching characteristics)
Current - Reverse Leakage @ Vr: ≤ 10 µA @ 400 V (allowable variance)
Operating Temperature - Junction: ≥ 150°C (minimum requirement)

Substitute parts meeting all primary criteria and most secondary criteria are classified as direct equivalents. Parts with variations in forward voltage, recovery time, or temperature range are noted for application-specific evaluation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	Package
CEFB104-G	Comchip Technology	400	1	1.1 @ 1 A	Fast Recovery ≤ 500ns	35	5 @ 400 V	150	Obsolete	DO-214AA (SMB)
CMR1-04 TR13 PBFREE	Central Semiconductor Corp	400	1	1.1 @ 1 A	Fast Recovery ≤ 500ns	—	10 @ 400 V	175	Active	DO-214AA (SMB)
ER1G-LTP	Micro Commercial Co	400	1	1.25 @ 1 A	Fast Recovery ≤ 500ns	35	5 @ 400 V	175	Active	DO-214AA (SMB)
MURS140-13-F	Diodes Incorporated	400	1	1.25 @ 1 A	Fast Recovery ≤ 500ns	50	5 @ 400 V	175	Active	DO-214AA (SMB)
RS1GB-13-F	Diodes Incorporated	400	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	150	5 @ 400 V	150	Active	DO-214AA (SMB)
S1GB-13-F	Diodes Incorporated	400	1	1.1 @ 1 A	Standard Recovery >500ns	3000	5 @ 400 V	150	Active	DO-214AA (SMB)
STTH1R04U	STMicroelectronics	400	1	1.5 @ 1 A	Fast Recovery ≤ 500ns	30	5 @ 400 V	175	Active	DO-214AA (SMB)
STTH1R04UY	STMicroelectronics	400	1	1.6 @ 1 A	Fast Recovery ≤ 500ns	30	5 @ 400 V	175	Active	DO-214AA (SMB)
STTH3R04U	STMicroelectronics	400	3	1.5 @ 3 A	Fast Recovery ≤ 500ns	35	5 @ 400 V	175	Active	DO-214AA (SMB)
UF1G-TP	Micro Commercial Co	400	1	1.4 @ 1 A	Fast Recovery ≤ 500ns	50	10 @ 400 V	150	Active	DO-214AA (SMB)
UFS140JE3/TR13	Microchip Technology	400	1	1.1 @ 1 A	Fast Recovery ≤ 500ns	50	10 @ 400 V	175	Active	DO-214BA

Engineering Selection Recommendations

Direct Equivalents (All Primary Criteria Met, Active Status):

The following parts satisfy all primary substitution criteria and maintain active product status with RoHS3 compliance:

CMR1-04 TR13 PBFREE (Central Semiconductor Corp): Matches forward voltage specification exactly at 1.1 V @ 1 A. Extended operating temperature range to 175°C. Tape & Reel packaging. RoHS3 compliant.
ER1G-LTP (Micro Commercial Co): Identical reverse recovery time of 35 ns. Forward voltage 1.25 V @ 1 A. Extended operating temperature range to 175°C. Tape & Reel packaging. RoHS3 compliant.
MURS140-13-F (Diodes Incorporated): Fast recovery characteristics maintained. Forward voltage 1.25 V @ 1 A. Extended operating temperature range to 175°C. Tape & Reel packaging. RoHS3 compliant.
STTH1R04U (STMicroelectronics): Fastest reverse recovery time at 30 ns. Forward voltage 1.5 V @ 1 A. Extended operating temperature range to 175°C. Cut Tape & Digi-Reel packaging. RoHS3 compliant.
UFS140JE3/TR13 (Microchip Technology): Matches forward voltage specification exactly at 1.1 V @ 1 A. Extended operating temperature range to 175°C. Tape & Reel packaging. RoHS3 compliant. Note: Package variant DO-214BA instead of DO-214AA.

Conditional Equivalents (Primary Criteria Met, Secondary Variations):

RS1GB-13-F (Diodes Incorporated): Meets all primary criteria. Forward voltage 1.3 V @ 1 A. Reverse recovery time 150 ns (slower than original). Operating temperature range -65°C ~ 150°C (matches original maximum). RoHS3 compliant.
STTH1R04UY (STMicroelectronics): Meets all primary criteria. Forward voltage 1.6 V @ 1 A (maximum allowable variance). Automotive grade with AEC-Q101 qualification. Operating temperature range -40°C ~ 175°C. RoHS3 compliant.
UF1G-TP (Micro Commercial Co): Meets all primary criteria. Forward voltage 1.4 V @ 1 A. Reverse recovery time 50 ns. Operating temperature range -50°C ~ 150°C. Bulk packaging. Active status.

Non-Equivalent Parts:

S1GB-13-F (Diodes Incorporated): Standard recovery classification (>500ns) with 3 µs reverse recovery time. Does not meet fast recovery requirement. Suitable only for applications not requiring fast switching characteristics.
STTH3R04U (STMicroelectronics): 3 A current rating exceeds 1 A specification. Not a direct substitute; suitable only for higher current applications.

Frequently Asked Questions (FAQ)

Q: Can S1GB-13-F be used as a substitute for CEFB104-G?

A: S1GB-13-F meets the voltage, current, and package requirements but differs in speed classification. The original CEFB104-G is specified as fast recovery (≤ 500ns), while S1GB-13-F is standard recovery (>500ns) with a reverse recovery time of 3 µs. Substitution is valid only if the application does not require fast switching characteristics. Verify circuit timing requirements before selection.

Q: What is the difference between DO-214AA and DO-214BA packages?

A: Both are surface mount SMB packages with identical mechanical dimensions and pin configurations. The primary difference is internal construction. UFS140JE3/TR13 uses DO-214BA while most other substitutes use DO-214AA. Both are mechanically and electrically compatible for PCB assembly purposes.

Q: Why does STTH1R04UY have an automotive grade designation?

A: STTH1R04UY carries AEC-Q101 qualification, indicating it meets automotive industry reliability and testing standards. This part is suitable for automotive applications requiring enhanced quality assurance. Non-automotive grades (such as STTH1R04U) are suitable for general industrial and consumer applications.

Q: Can STTH3R04U replace CEFB104-G in a 1 A circuit?

A: STTH3R04U is rated for 3 A average rectified current, exceeding the 1 A requirement. While it will function in a 1 A circuit, it is oversized for the application. Use STTH3R04U only when higher current capacity is required. For 1 A applications, select a 1 A rated substitute.

Q: What does "Tape & Reel (TR)" packaging mean?

A: Tape & Reel is a standard packaging format for automated assembly. Components are mounted on a continuous carrier tape wound on a reel, enabling high-speed pick-and-place machine processing. Cut Tape (CT) is the same tape format cut into smaller sections for lower-volume orders. Bulk packaging contains loose components. All three formats contain identical components; packaging selection depends on production volume and assembly equipment.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original CEFB104-G is marked as obsolete and does not carry RoHS certification. RoHS3 compliance ensures the parts meet European Union restrictions on hazardous substances and are suitable for new designs and production.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time is the interval required for a diode to stop conducting after the applied voltage reverses. Shorter recovery times (30-35 ns) enable faster switching and reduce switching losses in high-frequency applications. Longer recovery times (150 ns or greater) are acceptable in low-frequency or DC applications. The original CEFB104-G specifies 35 ns; most active substitutes maintain this specification or improve upon it.

Q: Can forward voltage variation affect circuit performance?

A: Forward voltage variation between 1.1 V and 1.6 V @ 1 A affects voltage drop across the diode during conduction. In rectifier circuits, this variation typically has minimal impact on overall circuit performance. In precision analog circuits or low-voltage applications, verify that the selected substitute's forward voltage is acceptable for the specific application requirements.

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