ER1K-TP Equivalent & Substitute Parts

Part Overview

The ER1K-TP is a general-purpose rectifier diode rated for 800 V DC reverse voltage with 1 A average rectified current in a surface mount DO-214AA (SMB) package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts with compatible electrical and mechanical specifications are available to maintain design continuity and ensure supply chain reliability.

Substiute Parts

ER1K-TP

Micro Commercial CoIn Stock: 904ER1K-TP Datasheet

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RS2K

Taiwan Semiconductor CorporationIn Stock: 15511RS2K Datasheet

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STTH208U

STMicroelectronicsIn Stock: 20394STTH208U Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ER1K-TP are qualified based on the following criteria:

Mandatory Compatibility Parameters:

• Voltage - DC Reverse (Vr) (Max): 800 V minimum
• Package / Case: DO-214AA, SMB (identical physical form factor)
• Mounting Type: Surface Mount
• Technology: Standard rectifier diode
• RoHS Status: ROHS3 Compliant

Allowable Variations:

• Current - Average Rectified (Io): Equal to or greater than 1 A
• Voltage - Forward (Vf): Within acceptable operating range for 800 V rectifier class
• Reverse Recovery Time (trr): Within fast recovery classification (≤ 500ns)
• Operating Temperature - Junction: Equal to or exceeding -50°C to 150°C range
• Product Status: Active preferred for supply continuity

The substitute parts RS2K and STTH208U meet all mandatory compatibility parameters and provide equal or superior electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

RS2K (Taiwan Semiconductor Corporation): RS2K is an active product with identical voltage and package specifications to the ER1K-TP. It provides doubled current capacity (2 A versus 1 A), enabling use in higher-current applications. The reverse recovery time of 500 ns remains within the fast recovery classification. This part is suitable for direct substitution in applications where the 1 A current rating of the ER1K-TP is adequate, with the added benefit of higher current headroom. ROHS3 compliance and unlimited MSL rating match the original specification.

STTH208U (STMicroelectronics): STTH208U is an active product with identical voltage and package specifications. It matches the reverse recovery time of the ER1K-TP at 75 ns and provides 2 A current capacity. The forward voltage is higher at 1.65 V @ 2 A compared to the ER1K-TP at 1.35 V @ 1 A, reflecting different operating points. The maximum junction temperature of 175°C exceeds the ER1K-TP operating range. ROHS3 compliance and unlimited MSL rating are maintained. This part is suitable for applications requiring the fastest recovery characteristics and extended temperature performance.

Both substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity ratings, matching the regulatory and environmental compliance profile of the original ER1K-TP.

Frequently Asked Questions (FAQ)

Q: Can RS2K or STTH208U be used as direct replacements for ER1K-TP on existing PCBs?

A: Yes. Both substitute parts use the identical DO-214AA (SMB) surface mount package. PCB footprints, solder pad layouts, and component placement are compatible without modification. No PCB redesign is required.

Q: What is the significance of the higher current rating (2 A) in RS2K and STTH208U compared to the ER1K-TP (1 A)?

A: The higher current rating indicates greater current-handling capacity. In applications where the ER1K-TP operates at or below 1 A, both substitute parts operate with additional current margin, improving reliability and thermal performance. The substitutes do not require the circuit to be redesigned for lower current applications.

Q: How do the reverse recovery times differ between the three parts?

A: The ER1K-TP and STTH208U both specify 75 ns reverse recovery time. The RS2K specifies 500 ns, which is still within the fast recovery classification (≤ 500ns). In high-frequency switching applications, the 75 ns parts (ER1K-TP and STTH208U) exhibit faster switching behavior. For standard rectification applications, both recovery times are acceptable.

Q: Are there compliance or regulatory differences between these parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. Moisture sensitivity level is 1 (unlimited) for all parts. No compliance barriers exist for substitution.

Q: What is the difference in forward voltage between the parts?

A: Forward voltage varies with current level. The ER1K-TP specifies 1.35 V @ 1 A, RS2K specifies 1.3 V @ 2 A, and STTH208U specifies 1.65 V @ 2 A. These differences reflect different semiconductor designs and operating points. For applications operating at 1 A or below, forward voltage drop remains within acceptable rectifier diode specifications for 800 V class devices.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For standard rectification with 1 A or lower current, both RS2K and STTH208U are suitable. RS2K offers lower forward voltage at higher current. STTH208U offers faster recovery time matching the original ER1K-TP. Both are active products with established supply chains, making either appropriate for new designs replacing the obsolete ER1K-TP.

Q: Is the operating temperature range a factor in substitution?

A: The ER1K-TP operates from -50°C to 150°C. RS2K extends the lower limit to -55°C. STTH208U specifies a maximum junction temperature of 175°C. For applications within the -50°C to 150°C range, all three parts are compatible. Applications requiring operation below -50°C should use RS2K. Applications requiring operation above 150°C should use STTH208U.