CEFM101-G Equivalent & Substitute Parts Reference

Part Overview

The CEFM101-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 1 A average rectified current. The device is packaged in SOD-123T (Mini SMA) surface mount configuration and is classified as Active product status with ROHS3 compliance. This part is suitable for applications requiring fast recovery characteristics with reverse recovery time of 25 ns and forward voltage of 875 mV at 1 A. Equivalent and substitute parts are identified based on matching electrical ratings, recovery speed classification, and compatible surface mount packaging within the DO-214AC (SMA) and SOD-123 families.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ 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 @ 50 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123T	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for CEFM101-G are qualified based on the following criteria:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) Maximum: 50 V
Current - Average Rectified (Io): 1 A
Speed Classification: Fast Recovery (≤ 500ns, > 200mA) or Standard Recovery (>500ns, > 200mA)
Mounting Type: Surface Mount
Package Compatibility: SOD-123T, DO-214AC (SMA), or equivalent surface mount configurations
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitution Logic: Parts are grouped into two categories based on recovery speed characteristics:

Fast Recovery Substitutes (Reverse Recovery Time ≤ 500ns): ES1A-E3/5AT, ES1A-E3/61T, ES1A-M3/61T, ES1AHE3_A/H, US1A-E3/5AT, RS1A-E3/61T. These parts maintain the fast recovery performance of the CEFM101-G and are suitable for direct replacement in applications requiring rapid switching.
Standard Recovery Substitutes (Reverse Recovery Time >500ns): S1A-E3/5AT, S1A-E3/61T, GS1A-LTP. These parts have slower recovery characteristics and are suitable for applications where switching speed is less critical.
Legacy/Not For New Designs: ES1A-LTP, GS1A-LTP. These parts remain functionally compatible but carry product status restrictions.

All substitute parts maintain the 50 V / 1 A electrical rating, surface mount configuration, and regulatory compliance required for direct substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (mV)	Speed Classification	trr (ns)	Ir @ Vr (µA)	Package	Temp Range (°C)	Product Status
CEFM101-G	Comchip Technology	50	1	875	Fast Recovery ≤ 500ns	25	5 @ 50V	SOD-123T	-55 to 150	Active
ES1A-E3/5AT	Vishay	50	1	920	Fast Recovery ≤ 500ns	25	5 @ 50V	DO-214AC (SMA)	-55 to 155	Active
ES1A-E3/61T	Vishay	50	1	920	Fast Recovery ≤ 500ns	25	5 @ 50V	DO-214AC (SMA)	-55 to 150	Active
ES1A-LTP	Micro Commercial Co	50	1	950	Fast Recovery ≤ 500ns	35	5 @ 50V	DO-214AC (SMA)	-65 to 175	Not For New Designs
ES1A-M3/61T	Vishay	50	1	920	Fast Recovery ≤ 500ns	25	5 @ 50V	DO-214AC (SMA)	-55 to 150	Active
ES1AHE3_A/H	Vishay	50	1	920	Fast Recovery ≤ 500ns	25	5 @ 50V	DO-214AC (SMA)	-55 to 150	Active
GS1A-LTP	Micro Commercial Co	50	1	1000	Standard Recovery >500ns	—	10 @ 50V	DO-214AC (SMA)	-55 to 150	Not For New Designs
RS1A-E3/61T	Vishay	50	1	1300	Fast Recovery ≤ 500ns	150	5 @ 50V	DO-214AC (SMA)	-55 to 150	Active
S1A-E3/5AT	Vishay	50	1	1100	Standard Recovery >500ns	1800	1 @ 50V	DO-214AC (SMA)	-55 to 150	Active
S1A-E3/61T	Vishay	50	1	1100	Standard Recovery >500ns	1800	1 @ 50V	DO-214AC (SMA)	-55 to 150	Active
US1A-E3/5AT	Vishay	50	1	1000	Fast Recovery ≤ 500ns	50	10 @ 50V	DO-214AC (SMA)	-55 to 150	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

ES1A-E3/61T and ES1A-M3/61T are the preferred substitutes for CEFM101-G. Both parts are manufactured by Vishay General Semiconductor - Diodes Division, carry Active product status, and maintain identical electrical performance: 50 V reverse voltage, 1 A average rectified current, 25 ns reverse recovery time, and 920 mV forward voltage at 1 A. These parts are packaged in DO-214AC (SMA) surface mount configuration with ROHS3 compliance and MSL 1 rating. ES1A-E3/61T offers the highest inventory availability (75,150 pcs) and is suitable for high-volume production requirements.

Fast Recovery Alternatives:

US1A-E3/5AT provides fast recovery performance (50 ns trr) with 1000 mV forward voltage and is suitable for applications requiring moderate switching speed with lower forward voltage drop compared to standard recovery options. RS1A-E3/61T offers fast recovery classification but exhibits higher forward voltage (1300 mV) and longer reverse recovery time (150 ns), making it suitable only for applications where these characteristics are acceptable.

Standard Recovery Options:

S1A-E3/61T and S1A-E3/5AT are standard recovery diodes with 1800 ns reverse recovery time and 1100 mV forward voltage. These parts are suitable for low-frequency rectification applications where switching speed is not critical. S1A-E3/61T provides the highest inventory availability (120,800 pcs) among all substitutes.

Legacy Parts (Not Recommended for New Designs):

ES1A-LTP and GS1A-LTP carry "Not For New Designs" product status and should be used only for legacy system maintenance or repair applications. These parts remain functionally compatible but are not recommended for new product development.

Automotive-Grade Option:

ES1AHE3_A/H is qualified to AEC-Q101 automotive standard and carries Active product status. This part is suitable for automotive applications requiring equivalent electrical performance with automotive-grade reliability certification.

Frequently Asked Questions (FAQ)

Q1: Can ES1A-E3/61T directly replace CEFM101-G in existing designs?

A: Yes. ES1A-E3/61T is electrically equivalent to CEFM101-G with matching 50 V reverse voltage, 1 A current rating, 25 ns reverse recovery time, and fast recovery speed classification. The primary difference is package configuration: CEFM101-G uses SOD-123T while ES1A-E3/61T uses DO-214AC (SMA). Both are surface mount packages with identical pin pitch and footprint compatibility. Verify PCB layout compatibility before implementation.

Q2: What is the difference between fast recovery and standard recovery diodes in this product family?

A: Fast recovery diodes (CEFM101-G, ES1A series, US1A-E3/5AT, RS1A-E3/61T) have reverse recovery time ≤ 500 ns and are suitable for switching applications requiring rapid turn-off characteristics. Standard recovery diodes (S1A series, GS1A-LTP) have reverse recovery time > 500 ns and are optimized for low-frequency rectification where switching speed is not critical. Selection depends on application switching frequency and performance requirements.

Q3: Why do some substitutes show higher forward voltage (Vf) than CEFM101-G?

A: Forward voltage variation is a normal characteristic across different diode families and manufacturers. CEFM101-G specifies 875 mV at 1 A, while ES1A series specifies 920 mV and S1A series specifies 1100 mV. These differences reflect different semiconductor material processing and junction design. For applications sensitive to forward voltage drop, select substitutes with Vf specifications closest to the original part. Verify thermal and efficiency impact in power dissipation calculations.

Q4: Can I use S1A-E3/61T as a substitute for CEFM101-G?

A: S1A-E3/61T is electrically compatible with CEFM101-G for voltage and current ratings (50 V, 1 A) and carries Active product status with high inventory availability. However, S1A-E3/61T is classified as standard recovery (1800 ns trr) while CEFM101-G is fast recovery (25 ns trr). Use S1A-E3/61T only in applications where switching speed is not critical or where the slower recovery time does not impact circuit performance. For high-frequency switching applications, use fast recovery substitutes (ES1A series or US1A-E3/5AT).

Q5: What is the significance of the packaging designation (SOD-123T vs. DO-214AC)?

A: SOD-123T and DO-214AC (SMA) are both surface mount packages with identical electrical performance and pin pitch. SOD-123T is a smaller form factor, while DO-214AC is a larger package. Both are compatible with standard surface mount assembly processes. Verify PCB footprint and land pattern compatibility with your design before selecting a substitute. Consult component datasheets for precise dimensional specifications.

Q6: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status and MSL 1 (Unlimited) moisture sensitivity rating, matching the regulatory requirements of CEFM101-G. All parts are suitable for applications requiring RoHS compliance and standard moisture handling procedures.

Q7: Which substitute offers the best inventory availability?

A: S1A-E3/61T offers the highest inventory availability with 120,800 pcs in stock. ES1A-E3/61T provides 75,150 pcs. For applications requiring immediate availability, these two parts are recommended. Verify current inventory status with your component supplier before finalizing procurement decisions.

Q8: Is ES1AHE3_A/H suitable for automotive applications?

A: Yes. ES1AHE3_A/H is qualified to AEC-Q101 automotive standard and carries Active product status. This part is suitable for automotive applications requiring equivalent electrical performance with automotive-grade reliability certification. Use this part for automotive designs requiring certified components.

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