CMHD457A TR Equivalent & Substitute Parts

Part Overview

The CMHD457A TR is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, rated for 70 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-123 package. This component is classified as a small signal diode with standard switching speed characteristics and is currently in active production status. Equivalent and substitute parts are identified based on matching electrical performance parameters and compatible package form factors for applications requiring general-purpose rectification in compact surface mount configurations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	70	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V
Current - Reverse Leakage @ Vr	25	nA @ 70 V
Capacitance @ Vr, F	6	pF @ 0V, 1MHz
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Operating Temperature - Junction	-65 to 150	°C
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the CMHD457A TR are selected based on the following criteria:

Electrical Compatibility Parameters:

Voltage - DC Reverse (Vr) rating must equal or exceed 70 V
Current - Average Rectified (Io) rating must equal or exceed 200 mA
Speed classification must be Small Signal with any speed capability
Forward voltage characteristics must be compatible with circuit requirements
Reverse leakage current must be acceptable for the application

Mechanical Compatibility Parameters:

Mounting type must be Surface Mount
Package form factor must be compatible with PCB layout (SOD-123, SOD-323, or SOD-523)
Operating temperature range must encompass the application environment

Compliance and Status:

Product status must be Active
REACH and ECCN classifications must match or be equivalent

The three substitute parts identified (1N4148WS-13-F, 1N4148WT-7, and BAV16WS-7-F) meet these criteria with voltage ratings of 75 V or 80 V, current ratings of 125 mA to 150 mA, and compatible surface mount packages. All substitute parts maintain small signal diode classification and active product status.

Parameter Comparison

Parameter	CMHD457A TR	1N4148WS-13-F	1N4148WT-7	BAV16WS-7-F
Manufacturer	Central Semiconductor Corp	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Voltage - DC Reverse (Vr) (Max)	70 V	75 V	80 V	75 V
Current - Average Rectified (Io)	200 mA	150 mA	125 mA	150 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	1.25 V @ 150 mA	1 V @ 50 mA	1.25 V @ 150 mA
Current - Reverse Leakage @ Vr	25 nA @ 70 V	1 µA @ 75 V	1 µA @ 75 V	1 µA @ 75 V
Capacitance @ Vr, F	6 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr)	—	4 ns	4 ns	4 ns
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-323	SOD-523	SOD-323
Operating Temperature - Junction	-65 to 150°C	150°C (Max)	-65 to 150°C	-65 to 150°C
Product Status	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99

Engineering Selection Recommendations

1N4148WS-13-F Selection Criteria: This substitute is suitable for applications where the 200 mA current requirement can be reduced to 150 mA. The part offers 75 V reverse voltage rating, exceeding the 70 V specification of the CMHD457A TR. The SOD-323 package requires PCB layout modification compared to the original SOD-123 footprint. This part is ROHS3 compliant with MSL rating of 1 (Unlimited) and maintains REACH Unaffected status. Packaging is available in Tape & Reel format.

1N4148WT-7 Selection Criteria: This substitute provides the highest reverse voltage rating at 80 V with a reduced current rating of 125 mA. The SOD-523 package is the smallest form factor among the substitutes, enabling space-constrained applications. Forward voltage at 1 V @ 50 mA matches the original specification more closely than other substitutes. Operating temperature range matches the original part (-65 to 150°C). This part is ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging is available in Cut Tape & Digi-Reel format with the highest inventory availability (114,200 pieces).

BAV16WS-7-F Selection Criteria: This substitute matches the electrical characteristics of the 1N4148WS-13-F with 75 V reverse voltage and 150 mA current rating. The SOD-323 package is identical to the 1N4148WS-13-F. Operating temperature range extends from -65 to 150°C, matching the original specification. This part is ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging is available in Cut Tape & Digi-Reel format with 26,100 pieces in stock.

All substitute parts maintain Active product status and REACH Unaffected compliance classification. Selection between substitutes depends on current requirement tolerance, package footprint compatibility, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the CMHD457A TR be directly replaced with 1N4148WS-13-F without circuit modification?

A: Direct replacement requires verification that the application circuit can operate with 150 mA maximum current instead of 200 mA. The 75 V reverse voltage rating exceeds the original 70 V specification. The SOD-323 package footprint differs from SOD-123, requiring PCB layout changes.

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

A: The three substitutes differ in current rating (150 mA for 1N4148WS-13-F and BAV16WS-7-F versus 125 mA for 1N4148WT-7), reverse voltage rating (75 V for 1N4148WS-13-F and BAV16WS-7-F versus 80 V for 1N4148WT-7), and package form factor (SOD-323 for 1N4148WS-13-F and BAV16WS-7-F versus SOD-523 for 1N4148WT-7).

Q: Are all substitute parts RoHS compliant?

A: Yes, all three substitute parts are ROHS3 compliant. The original CMHD457A TR does not specify RoHS status in the provided data.

Q: What is the impact of package change from SOD-123 to SOD-323 or SOD-523?

A: Package changes require PCB footprint modification. SOD-323 and SOD-523 are smaller form factors than SOD-123, which may enable space optimization but necessitate PCB redesign and revalidation.

Q: Do all substitute parts have the same operating temperature range?

A: No. The 1N4148WS-13-F specifies a maximum junction temperature of 150°C without a minimum value, while the CMHD457A TR, 1N4148WT-7, and BAV16WS-7-F specify -65 to 150°C. Applications requiring operation below 0°C should use 1N4148WT-7 or BAV16WS-7-F.

Q: What is the significance of reverse recovery time (trr) listed for substitute parts?

A: Reverse recovery time of 4 ns is provided for all substitute parts but not specified for the original CMHD457A TR. This parameter indicates switching speed and is relevant for high-frequency applications. The small signal classification applies to all parts.

Q: Which substitute part has the highest inventory availability?

A: The 1N4148WT-7 has the highest inventory with 114,200 pieces in stock, compared to 26,100 pieces for BAV16WS-7-F and 1,500 pieces for 1N4148WS-13-F.

Q: Can the CMHD457A TR be used in applications requiring 125 mA or 150 mA current?

A: Yes, the CMHD457A TR is rated for 200 mA average rectified current, which exceeds both 125 mA and 150 mA requirements. However, the reverse substitution (using lower-rated parts in place of the CMHD457A TR) requires circuit analysis to confirm current demands do not exceed substitute part ratings.

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