CEFM103-G Equivalent & Substitute Parts Reference

Part Overview

The CEFM103-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 200 V DC reverse voltage and 1 A average rectified current in a Surface Mount Mini SMA/SOD-123 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	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 @ 200 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	SOD-123T	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CEFM103-G is determined by strict equivalence in the following electrical parameters:

Voltage Rating: 200 V DC reverse voltage (Vr) maximum
Current Rating: 1 A average rectified current (Io)
Speed Classification: Fast Recovery ≤ 500ns for currents > 200mA
Reverse Recovery Time: 25 ns nominal
Reverse Leakage Current: 5 µA @ 200 V
Operating Temperature Range: -55°C to 150°C junction temperature
Mounting Type: Surface Mount
Package Compatibility: SOD-123T, DO-214AC (SMA), or SOD-123F packages

Substitute parts are grouped into two categories based on package type:

Category 1: DO-214AC (SMA) Package Substitutes These parts maintain the same electrical specifications and are housed in the DO-214AC (SMA) package, which is mechanically compatible with SOD-123T footprints in most applications.

Category 2: SOD-123F Package Substitute This part maintains electrical specifications in an alternative surface mount package.

All substitute parts listed are active products with current manufacturing status and full RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	trr [ns]	Ir @ 200V [µA]	Package	Status
CEFM103-G	Comchip Technology	200	1	875	25	5	SOD-123T	Obsolete
CMMR1S-02 TR PBFREE	Central Semiconductor Corp	200	1	950	35	10	SOD-123F	Active
ES1D-E3/5AT	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1D-E3/61T	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1D-M3/5AT	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1D-M3/61T	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1DHE3_A/H	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1DHE3_A/I	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ESH1D-E3/61T	Vishay General Semiconductor	200	1	900	25	1	DO-214AC (SMA)	Active
RS1D-E3/5AT	Vishay General Semiconductor	200	1	1300	150	5	DO-214AC (SMA)	Active
RS1D-E3/61T	Vishay General Semiconductor	200	1	1300	150	5	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match)

The ES1D series from Vishay General Semiconductor (ES1D-E3/5AT, ES1D-E3/61T, ES1D-M3/5AT, ES1D-M3/61T) provide the closest electrical equivalence to the CEFM103-G. These parts maintain identical reverse voltage (200 V), current rating (1 A), reverse recovery time (25 ns), and reverse leakage current (5 µA @ 200 V). Forward voltage is slightly higher at 920 mV versus 875 mV, representing a 45 mV increase. All ES1D variants are active products with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Automotive-Grade Alternatives

The ES1DHE3_A/H and ES1DHE3_A/I variants are AEC-Q101 qualified automotive-grade diodes with identical electrical specifications to the standard ES1D series. These are suitable for applications requiring automotive qualification.

Enhanced Performance Option

The ESH1D-E3/61T offers superior reverse leakage performance (1 µA @ 200 V versus 5 µA) and extended operating temperature range (-55°C to 175°C versus -55°C to 150°C). Forward voltage is 900 mV, providing a 25 mV improvement over the original CEFM103-G specification.

Alternative Package Option

The CMMR1S-02 TR PBFREE from Central Semiconductor Corp provides substitution in SOD-123F package. This part maintains 200 V and 1 A ratings but exhibits higher forward voltage (950 mV) and longer reverse recovery time (35 ns), with increased reverse leakage (10 µA @ 200 V).

Not Recommended for Direct Substitution

The RS1D series (RS1D-E3/5AT, RS1D-E3/61T) exhibits significantly different electrical characteristics: forward voltage of 1.3 V and reverse recovery time of 150 ns. These parts are suitable only for applications where slower recovery and higher forward voltage are acceptable.

Frequently Asked Questions (FAQ)

Q: Can ES1D series diodes directly replace CEFM103-G in existing designs?

A: Yes. The ES1D series maintains all critical electrical parameters: 200 V reverse voltage, 1 A current rating, 25 ns reverse recovery time, and 5 µA reverse leakage current. The 45 mV increase in forward voltage (920 mV versus 875 mV) is within typical design margins for general-purpose rectifier applications. Package compatibility requires PCB footprint verification, as DO-214AC (SMA) and SOD-123T have similar but not identical dimensions.

Q: What is the difference between ES1D-E3/5AT and ES1D-E3/61T?

A: Both parts are electrically identical. The difference is in packaging format: ES1D-E3/5AT is supplied in Cut Tape (CT) & Digi-Reel format, while ES1D-E3/61T is supplied in Tape & Reel (TR) format. Selection depends on production volume and handling requirements.

Q: When should ESH1D-E3/61T be selected over standard ES1D variants?

A: The ESH1D-E3/61T is selected when lower reverse leakage current (1 µA versus 5 µA) is required or when extended operating temperature range to 175°C is necessary. Forward voltage is also slightly lower at 900 mV.

Q: Are automotive-grade ES1DHE3_A/H and ES1DHE3_A/I suitable for non-automotive applications?

A: Yes. AEC-Q101 qualification is a superset of standard reliability requirements. These parts are fully compatible with non-automotive applications and offer the same electrical performance as standard ES1D variants.

Q: Why is the RS1D series listed if it has different electrical characteristics?

A: The RS1D series is included because it maintains the same voltage and current ratings (200 V, 1 A) and is listed in the original CEFM103-G substitute documentation. However, the significantly higher forward voltage (1.3 V) and longer reverse recovery time (150 ns) make it unsuitable for direct replacement in most applications. Use only if circuit design specifically accommodates these characteristics.

Q: What packaging considerations apply when switching from SOD-123T to DO-214AC (SMA)?

A: Both packages are surface mount with similar footprints, but dimensions differ slightly. DO-214AC (SMA) is slightly larger. PCB layout verification is required to confirm pad spacing and clearance compatibility. Most modern designs accommodate both packages without modification.

Q: Is the CMMR1S-02 TR PBFREE a suitable replacement?

A: The CMMR1S-02 maintains voltage and current ratings but exhibits degraded performance: forward voltage of 950 mV (75 mV higher than CEFM103-G) and reverse recovery time of 35 ns (10 ns longer). Use only if circuit design tolerates these parameters or if SOD-123F package is specifically required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating, matching the original CEFM103-G specifications.

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