CFRM103-G Equivalent & Substitute Parts Reference

Part Overview

The CFRM103-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 SOD-123T package. This part is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements where the original part is no longer procurable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	1	µA @ 200 V
Mounting Type	Surface Mount	—
Package / Case	SOD-123T	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CFRM103-G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Mounting Type: Surface Mount
Technology: Standard rectifier diode

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 0.9 V to 1.3 V @ 1 A
Reverse Recovery Time (trr): Fast recovery characteristic (≤ 500 ns for > 200 mA)
Operating Temperature Range: Must support -55°C to 150°C minimum
Package compatibility: SOD-123T (Mini SMA) or DO-214AC (SMA) packages are mechanically compatible for surface mount applications

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

Category 1 - SOD-123T Package (Direct Package Match): CFRM104-HF maintains identical package form factor with upgraded voltage rating (400 V).

Category 2 - DO-214AC (SMA) Package (Functionally Equivalent): Vishay ES1D series, Micro Commercial Co ES1D-LTP, and Vishay ESH1D-E3/61T provide electrical equivalence with alternative package geometry. These parts meet or exceed all electrical requirements of the CFRM103-G while offering improved availability and active product status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
CFRM103-G	Comchip Technology	200	1	1.3	150	1 @ 200V	SOD-123T	Obsolete	—
CFRM104-HF	Comchip Technology	400	1	1.3	150	5 @ 400V	SOD-123T	Active	ROHS3 Compliant
ES1D-E3/5AT	Vishay General Semiconductor	200	1	0.92	25	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ES1D-E3/61T	Vishay General Semiconductor	200	1	0.92	25	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ES1D-LTP	Micro Commercial Co	200	1	0.95	35	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ES1D-M3/5AT	Vishay General Semiconductor	200	1	0.92	25	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ES1D-M3/61T	Vishay General Semiconductor	200	1	0.92	25	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ES1DHE3_A/H	Vishay General Semiconductor	200	1	0.92	25	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ES1DHE3_A/I	Vishay General Semiconductor	200	1	0.92	25	5 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
ESH1D-E3/61T	Vishay General Semiconductor	200	1	0.90	25	1 @ 200V	DO-214AC (SMA)	Active	ROHS3 Compliant
FS1DE-TP	Micro Commercial Co	200	1	1.3	150	5 @ 200V	DO-214AC (SMA)	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Replacement (SOD-123T):

CFRM104-HF is the only active substitute maintaining the SOD-123T package form factor. This part is manufactured by Comchip Technology and carries ROHS3 compliance. The 400 V rating provides additional voltage margin over the original 200 V specification. This part is suitable for direct PCB substitution without layout modification.

For Functional Equivalence with Package Change (DO-214AC/SMA):

The Vishay ES1D series (ES1D-E3/5AT, ES1D-E3/61T, ES1D-M3/5AT, ES1D-M3/61T) and ESH1D-E3/61T provide active, ROHS3-compliant alternatives. These parts meet all electrical requirements of the CFRM103-G with improved reverse recovery time (25 ns versus 150 ns) and lower forward voltage drop (0.90–0.92 V versus 1.3 V). All Vishay parts carry AEC-Q101 automotive qualification in the ES1DHE3_A/H and ES1DHE3_A/I variants.

Micro Commercial Co ES1D-LTP and FS1DE-TP are active and obsolete alternatives respectively, both in DO-214AC package with ROHS3 compliance.

Compliance Status:

All recommended active substitutes carry ROHS3 compliance and REACH Unaffected status. Moisture Sensitivity Level is 1 (Unlimited) across all parts, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can CFRM104-HF be used as a direct replacement for CFRM103-G?

A: Yes. CFRM104-HF maintains identical SOD-123T package geometry and surface mount footprint. The 400 V rating is backward-compatible with 200 V circuit requirements. No PCB layout changes are required.

Q: What is the difference between SOD-123T and DO-214AC packages?

A: SOD-123T and DO-214AC (SMA) are both surface mount packages for single diodes but have different physical dimensions and land patterns. SOD-123T is a smaller form factor (Mini SMA), while DO-214AC is a standard SMA package. PCB footprint modification is required when switching between these package types.

Q: Why do Vishay ES1D parts have lower forward voltage (0.92 V) compared to CFRM103-G (1.3 V)?

A: Forward voltage variation is a normal characteristic difference between manufacturers and diode process technology. The 0.92 V specification for Vishay ES1D parts is within acceptable operating range for general-purpose rectifier applications and results in lower power dissipation.

Q: Are the Vishay ES1DHE3_A/H and ES1DHE3_A/I variants suitable for automotive applications?

A: Yes. Both variants carry AEC-Q101 automotive qualification and are designated as Grade: Automotive. These parts are suitable for automotive-grade circuit designs.

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

A: Reverse recovery time affects switching speed and switching losses. Vishay ES1D and ESH1D parts feature 25 ns trr compared to CFRM103-G at 150 ns, indicating faster switching characteristics. This is beneficial in high-frequency switching applications but does not affect basic rectification performance in standard AC-to-DC conversion circuits.

Q: Can FS1DE-TP be used as a substitute?

A: FS1DE-TP is classified as obsolete and is not recommended for new designs. While it meets electrical specifications, active alternatives with guaranteed long-term availability should be selected.

Q: What is the difference between ES1D-E3/5AT and ES1D-M3/5AT?

A: Both parts are electrically identical with 200 V rating and 1 A current. The designation difference (E3 versus M3) reflects packaging configuration variants. ES1D-E3/5AT is supplied in Cut Tape (CT) & Digi-Reel format, while ES1D-M3/5AT is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly requirements.

Q: Is ESH1D-E3/61T a better choice than ES1D variants?

A: ESH1D-E3/61T offers lower reverse leakage current (1 µA @ 200 V versus 5 µA) and slightly lower forward voltage (0.90 V versus 0.92 V). Selection between ESH1D and ES1D depends on specific circuit requirements for leakage current performance. Both are active, ROHS3-compliant parts suitable for general-purpose rectification.

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