CGRC304-G General Purpose Rectifier Diode 400V 3A DO-214AB Equivalent & Substitute Parts

Part Overview

The CGRC304-G is a general purpose rectifier diode manufactured by Comchip Technology, rated for 400V DC reverse voltage and 3A average rectified current in a surface mount DO-214AB (SMC) package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing production and maintenance applications. The CGRC304-G operates with standard recovery characteristics (>500ns) and a maximum forward voltage of 1.1V at 3A, making it suitable for standard AC-to-DC conversion and general rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CGRC304-G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400V minimum
Current - Average Rectified (Io): 3A minimum
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current: tolerance within application requirements
Recovery speed classification: Standard or Fast recovery acceptable
Operating temperature range: -55°C to 150°C minimum
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (400V, 3A, Standard Recovery): Parts maintaining identical voltage and current ratings with standard recovery characteristics, differing primarily in forward voltage specification and packaging format.

Category 2 - Functional Equivalents (400V, 3A, Fast Recovery): Parts meeting voltage and current requirements with enhanced fast recovery characteristics (≤500ns), suitable for applications tolerating faster switching behavior.

Non-Equivalent Part: S3AC-HF is excluded from substitution due to 50V maximum reverse voltage rating, which does not meet the 400V requirement of the CGRC304-G application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V)	Speed	Reverse Recovery Time (ns)	Package	Product Status	Inventory (Pcs)
CGRC304-G	Comchip Technology	400	3	1.1 @ 3A	Standard >500ns	—	DO-214AB	Obsolete	1128
CGRC304-HF	Comchip Technology	400	3	1.1 @ 3A	Standard >500ns	—	DO-214AB	Active	1066
S3G	Diotec Semiconductor	400	3	1.15 @ 3A	Standard >500ns	1500	DO-214AB	Active	14614
S3G-13-F	Diodes Incorporated	400	3	1.15 @ 3A	Standard >500ns	—	DO-214AB	Active	30400
S3G-E3/57T	Vishay General Semiconductor	400	3	1.15 @ 2.5A	Standard >500ns	2500	DO-214AB	Active	30400
S3G-E3/9AT	Vishay General Semiconductor	400	3	1.15 @ 2.5A	Standard >500ns	2500	DO-214AB	Active	12300
S3G-TP	Micro Commercial Co	400	3	1.2 @ 3A	Standard >500ns	—	DO-214AB	Not For New Designs	6327
ER3G-TP	Micro Commercial Co	400	3	1.25 @ 3A	Fast ≤500ns	35	DO-214AB	Active	42810
RS3G-13-F	Diodes Incorporated	400	3	1.3 @ 3A	Fast ≤500ns	150	DO-214AB	Active	29100
RS3G-E3/57T	Vishay General Semiconductor	400	3	1.3 @ 2.5A	Fast ≤500ns	150	DO-214AB	Active	7818

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

CGRC304-HF (Comchip Technology) is the manufacturer-recommended direct replacement for the obsolete CGRC304-G. Both parts share identical electrical specifications (400V, 3A, 1.1V forward voltage) and packaging. CGRC304-HF maintains active product status with 1066 units in stock and carries ROHS3 compliance and MSL 1 rating identical to the original part. This substitution requires no circuit redesign or thermal analysis.

Secondary Recommendations - Standard Recovery Category:

S3G-13-F (Diodes Incorporated) and S3G-E3/57T (Vishay General Semiconductor) provide equivalent 400V/3A ratings with standard recovery characteristics. Forward voltage increases to 1.15V at rated current, representing a 45mV rise from the original specification. Both parts are active, widely available (30400 and 30400 units respectively), and ROHS3 compliant. These substitutions are suitable for applications where the marginal forward voltage increase does not impact thermal or efficiency budgets.

S3G (Diotec Semiconductor) offers equivalent performance with 14614 units available. RoHS compliance status is not applicable per manufacturer data; verify compliance requirements before selection for regulated applications.

Alternative Recommendations - Fast Recovery Category:

ER3G-TP (Micro Commercial Co) and RS3G-13-F (Diodes Incorporated) provide 400V/3A ratings with fast recovery characteristics (≤500ns). These parts exhibit higher forward voltages (1.25V and 1.3V respectively) and faster reverse recovery times (35ns and 150ns). Fast recovery variants are suitable for high-frequency switching applications or circuits requiring reduced reverse recovery losses. ER3G-TP offers the highest inventory availability (42810 units).

Not Recommended for New Designs:

S3G-TP (Micro Commercial Co) carries "Not For New Designs" status and should be avoided for new product development, despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can CGRC304-HF directly replace CGRC304-G without circuit modification?

A: Yes. CGRC304-HF is the manufacturer-recommended equivalent with identical electrical ratings (400V, 3A, 1.1V forward voltage) and DO-214AB packaging. No circuit redesign is required. The only difference is packaging format (Tape & Reel vs. bulk), which does not affect electrical performance.

Q: What is the difference between standard recovery and fast recovery diodes in this category?

A: Standard recovery diodes (CGRC304-G, S3G, S3G-13-F) exhibit reverse recovery times >500ns, suitable for 50-60Hz line frequency rectification and general-purpose applications. Fast recovery diodes (ER3G-TP, RS3G-13-F) have reverse recovery times ≤500ns (35-150ns), reducing switching losses in high-frequency circuits. Fast recovery variants generate higher forward voltage drops (1.25-1.3V vs. 1.1-1.15V), increasing heat dissipation.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts carry explicit ROHS3 Compliant status. S3G (Diotec Semiconductor) lists RoHS compliance as "Not applicable" per manufacturer specification. Verify RoHS compliance documentation with the supplier before selecting S3G for regulated applications requiring RoHS certification.

Q: What packaging formats are available for these substitutes?

A: Substitute parts are supplied in three packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and bulk. CGRC304-HF, S3G-E3/9AT, and ER3G-TP are supplied in Tape & Reel format. S3G, S3G-13-F, and RS3G-13-F are supplied in Cut Tape & Digi-Reel® format. Packaging selection depends on assembly equipment compatibility and order quantity requirements.

Q: Can I use a 50V rated diode (S3AC-HF) as a substitute?

A: No. S3AC-HF is rated for 50V maximum reverse voltage and cannot substitute for the CGRC304-G, which requires 400V rating. Using an undersized voltage-rated diode will result in immediate failure and potential circuit damage.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage increases from 1.1V (CGRC304-G) to 1.15-1.3V in substitute parts result in proportional increases in power dissipation and heat generation. For a 3A rectifier, a 0.2V increase generates an additional 0.6W of heat. Verify that thermal design margins accommodate the higher forward voltage before selecting fast recovery variants (1.25-1.3V).

Q: Which substitute offers the best inventory availability?

A: ER3G-TP (Micro Commercial Co) offers the highest inventory with 42810 units in stock. S3G-13-F and S3G-E3/57T (both 30400 units) provide comparable availability. CGRC304-HF (1066 units) and RS3G-E3/57T (7818 units) have more limited stock.

Q: Are there any temperature range differences between substitutes?

A: Most substitutes operate to 150°C maximum junction temperature, matching the original CGRC304-G. S3G-13-F extends the lower operating limit to -65°C (vs. -50°C for most alternatives), providing wider temperature range for extreme environment applications. ER3G-TP operates to 175°C maximum, suitable for high-temperature environments.

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