CEFB102-G General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The CEFB102-G is a general purpose rectifier diode manufactured by Comchip Technology, rated for 100V DC reverse voltage and 1A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance and availability requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	875 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	25	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the CEFB102-G are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100V
Current - Average Rectified (Io): Must equal or exceed 1A
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount
Speed Classification: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Parameters:

Reverse Recovery Time (trr): Lower values indicate improved performance
Voltage - Forward (Vf) (Max): Lower values indicate improved efficiency
Current - Reverse Leakage @ Vr: Lower values indicate improved performance
Operating Temperature Range: Wider ranges provide design flexibility

All three substitute parts meet or exceed the critical electrical parameters of the CEFB102-G while maintaining identical package and mounting specifications.

Parameter Comparison

Parameter	CEFB102-G (Main)	ER1B-LTP	ES2B-E3/5BT	RS1BB-13-F
Manufacturer	Comchip Technology	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Diodes Incorporated
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	1 A	1 A	2 A	1 A
Voltage - Forward (Vf) (Max) @ If	875 mV @ 1 A	950 mV @ 1 A	900 mV @ 2 A	1.3 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	25 ns	35 ns	30 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	10 µA @ 100 V	5 µA @ 100 V
Capacitance @ Vr, F	—	15 pF @ 4V, 1MHz	18 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	150°C (Max)	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C
Product Status	Obsolete	Not For New Designs	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	—	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

ES2B-E3/5BT (Preferred Substitute)

The ES2B-E3/5BT from Vishay General Semiconductor is the recommended primary substitute. This part maintains 100V reverse voltage rating and exceeds the 1A current requirement at 2A, providing design margin. The part is classified as Active, ensuring long-term availability and supply chain stability. Full ROHS3 compliance and REACH unaffected status satisfy modern regulatory requirements. The 30ns reverse recovery time and 900mV forward voltage represent acceptable performance characteristics for general purpose rectification applications.

ER1B-LTP (Secondary Substitute)

The ER1B-LTP from Micro Commercial Co provides exact electrical equivalence at 100V and 1A ratings. This part offers the lowest reverse recovery time at 35ns among the substitutes, supporting high-frequency switching applications. However, product status is classified as Not For New Designs, limiting suitability for new production programs. ROHS3 compliance and REACH unaffected status are maintained. This part is suitable for legacy system maintenance and repair applications where supply exists.

RS1BB-13-F (Alternative Substitute)

The RS1BB-13-F from Diodes Incorporated meets all critical electrical parameters at 100V and 1A ratings. This part is classified as Active with full ROHS3 compliance, supporting long-term availability. The 150ns reverse recovery time is significantly higher than alternatives, making this part suitable for lower-frequency applications where switching speed is not critical. Forward voltage of 1.3V @ 1A is higher than alternatives, resulting in increased power dissipation in high-current applications.

Frequently Asked Questions (FAQ)

Q: Can ES2B-E3/5BT replace CEFB102-G in all applications?

A: Yes. The ES2B-E3/5BT meets or exceeds all critical electrical parameters: 100V reverse voltage, 2A average rectified current (exceeding the 1A requirement), identical DO-214AA SMB package, and surface mount configuration. The part is Active status with full compliance certifications.

Q: What is the difference between the three substitute parts?

A: All three substitutes maintain 100V reverse voltage and DO-214AA SMB packaging. Primary differences are: ES2B-E3/5BT provides 2A current capacity (versus 1A for others) and is Active status; ER1B-LTP offers 35ns reverse recovery time but is Not For New Designs; RS1BB-13-F is Active but has 150ns reverse recovery time and higher forward voltage at 1.3V.

Q: Why is reverse recovery time important for substitution?

A: Reverse recovery time (trr) determines switching speed and affects performance in high-frequency applications. The CEFB102-G specifies 25ns. ER1B-LTP at 35ns and ES2B-E3/5BT at 30ns maintain similar performance. RS1BB-13-F at 150ns is significantly slower and suitable only for lower-frequency circuits.

Q: Are all substitutes RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of product status (Active vs. Not For New Designs vs. Obsolete)?

A: Product status indicates manufacturer support and supply availability. Active parts have guaranteed long-term supply and support. Not For New Designs indicates the manufacturer will not develop new versions but existing stock may be available. Obsolete indicates no manufacturer support or supply.

Q: Can I use RS1BB-13-F in high-speed switching applications?

A: No. The RS1BB-13-F has 150ns reverse recovery time, which is significantly slower than the CEFB102-G (25ns) and other substitutes. Use this part only in applications where switching speed is not critical, such as low-frequency rectification circuits.

Q: Is the higher forward voltage of RS1BB-13-F (1.3V) a concern?

A: Higher forward voltage increases power dissipation and heat generation. In 1A applications, this results in approximately 0.425W additional dissipation compared to the CEFB102-G. Verify thermal design margins before selection.

Q: Do all substitutes use identical packaging?

A: Yes. All substitutes use DO-214AA (SMB) surface mount package with identical footprints and mounting requirements. No PCB layout changes are required.

Q: Which substitute should I choose for new product designs?

A: ES2B-E3/5BT is the recommended choice for new designs. It is Active status, provides current margin at 2A, maintains fast switching characteristics at 30ns, and has full compliance certifications ensuring long-term availability.

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