US1K-TP Equivalent & Substitute Parts

Part Overview

The US1K-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 800 V DC reverse voltage and 1 A average rectified current in a surface-mount DO-214AC (SMA) package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original component is no longer readily available or where design flexibility permits alternative solutions.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 1 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	10 µA @ 800 V	µA
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the US1K-TP are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-214AC (SMA) or compatible surface-mount package
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Secondary Considerations:

Reverse Recovery Time (trr): Fast recovery (≤ 500ns) preferred for direct replacement
Operating Temperature Range: -65°C to 175°C preferred for full compatibility
Product Status: Active status preferred for long-term availability

Grouping Logic:

Group 1 – Direct Equivalents (800 V, 1 A, DO-214AC, Fast Recovery): Parts that match all primary electrical specifications and fast recovery characteristics, maintaining the same voltage and current ratings with identical or superior package compatibility.

Group 2 – Functional Equivalents (800 V, 1 A, DO-214AC, Standard Recovery): Parts that meet voltage and current requirements in the same package but with standard recovery characteristics, suitable for applications where switching speed is not critical.

Group 3 – Higher Voltage Alternatives (1000 V, 1 A, DO-214AC/DO-214BA): Parts rated for 1000 V that can substitute in 800 V applications, providing additional voltage margin. These are backward-compatible for 800 V circuits.

Group 4 – Package Variants (800 V, 1 A, DO-214BA): Parts with identical electrical ratings but in DO-214BA (GF1) package instead of DO-214AC, requiring PCB layout verification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	Speed	trr [ns]	Package	Tj Range [°C]	Status
US1K-TP	Micro Commercial Co	800	1	1.7	Fast Recovery ≤ 500ns	75	DO-214AC	-65 ~ 175	Not For New Designs
CGRA4006-G	Comchip Technology	800	1	1.1	Fast Recovery ≤ 500ns	—	DO-214AC	-55 ~ 150	Active
GF1K-E3/67A	Vishay General Semiconductor	800	1	1.2	Standard Recovery > 500ns	2000	DO-214BA	-65 ~ 175	Active
GF1M	onsemi	1000	1	1.2	Standard Recovery > 500ns	2000	DO-214AC	-65 ~ 175	Not For New Designs
GF1M-E3/5CA	Vishay General Semiconductor	1000	1	1.2	Standard Recovery > 500ns	2000	DO-214BA	-65 ~ 175	Active
GF1M-E3/67A	Vishay General Semiconductor	1000	1	1.2	Standard Recovery > 500ns	2000	DO-214BA	-65 ~ 175	Active
MRA4007T3G	onsemi	1000	1	1.1	Standard Recovery > 500ns	—	DO-214AC	-55 ~ 175	Not For New Designs
RS1K-M3/5AT	Vishay General Semiconductor	800	1	1.3	Fast Recovery ≤ 500ns	250	DO-214AC	-55 ~ 150	Active
RS1K-M3/61T	Vishay General Semiconductor	800	1	1.3	Fast Recovery ≤ 500ns	500	DO-214AC	-55 ~ 150	Active
RS1KHE3_A/H	Vishay General Semiconductor	800	1	1.3	Fast Recovery ≤ 500ns	500	DO-214AC	-55 ~ 150	Active
RS1KHE3_A/I	Vishay General Semiconductor	800	1	1.3	Fast Recovery ≤ 500ns	500	DO-214AC	-55 ~ 150	Active

Engineering Selection Recommendations

For Direct Replacement (Preferred):

CGRA4006-G (Comchip Technology) is the primary direct substitute. It maintains 800 V / 1 A specifications, fast recovery characteristics, and DO-214AC packaging. The part is Active status, ensuring long-term availability. Forward voltage is lower (1.1 V vs. 1.7 V), which reduces power dissipation. Operating temperature range is narrower (-55°C to 150°C vs. -65°C to 175°C), requiring verification against application requirements.

For Active Product Status with Extended Temperature Range:

RS1K-M3/5AT and RS1K-M3/61T (Vishay General Semiconductor) are Active parts maintaining 800 V / 1 A ratings and fast recovery in DO-214AC packages. Both are qualified to -55°C to 150°C. RS1KHE3_A/H and RS1KHE3_A/I include AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications. Forward voltage is 1.3 V, intermediate between CGRA4006-G and the original US1K-TP.

For Higher Voltage Margin:

GF1M-E3/5CA and GF1M-E3/67A (Vishay General Semiconductor, SUPERECTIFIER® series) provide 1000 V rating in Active status with -65°C to 175°C operating range. These are suitable for applications requiring additional voltage headroom. Package is DO-214BA (GF1) instead of DO-214AC, requiring PCB footprint verification. Recovery time is standard (2 µs), acceptable for non-switching applications.

For Legacy System Continuity:

GF1M (onsemi) provides 1000 V / 1 A in DO-214AC package with extended temperature range (-65°C to 175°C). Status is "Not For New Designs," similar to US1K-TP, but offers higher voltage rating and same package compatibility.

Compliance Verification:

All substitute parts listed are ROHS3 Compliant and REACH Unaffected, matching the original part's regulatory status. MSL rating is 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can CGRA4006-G directly replace US1K-TP without PCB modification?

A: Yes. CGRA4006-G maintains identical voltage (800 V), current (1 A), and package (DO-214AC) specifications. No PCB layout changes are required. Forward voltage is lower (1.1 V vs. 1.7 V), reducing power dissipation. Verify application operating temperature range does not exceed -55°C to 150°C limits.

Q: What is the difference between DO-214AC and DO-214BA packages?

A: DO-214AC (SMA) and DO-214BA (GF1) are different surface-mount diode packages with different footprints. Parts specified for DO-214BA (such as GF1K-E3/67A) require PCB layout verification and may not be directly interchangeable without footprint redesign. Consult PCB design files and component datasheets for exact dimensions.

Q: Why do some substitutes have 1000 V rating instead of 800 V?

A: Higher voltage-rated diodes (1000 V) are backward-compatible with 800 V applications, providing additional voltage margin and safety factor. They can be used in 800 V circuits without functional degradation. This approach is common in legacy system support where higher-rated components offer better long-term availability.

Q: What does "Fast Recovery ≤ 500ns" mean, and why does it matter?

A: Reverse recovery time (trr) is the time required for a diode to stop conducting after reverse bias is applied. Fast recovery (≤ 500ns) is critical in switching power supplies and high-frequency circuits to minimize switching losses and electromagnetic interference. Standard recovery (> 500ns) is acceptable for linear power supplies and low-frequency rectification.

Q: Are RS1KHE3_A/H and RS1KHE3_A/I suitable for automotive applications?

A: Yes. Both parts carry AEC-Q101 automotive qualification, indicating compliance with automotive reliability and environmental standards. They are suitable for automotive and high-reliability applications requiring formal qualification documentation.

Q: What is the impact of forward voltage differences between substitutes?

A: Forward voltage (Vf) affects power dissipation and heat generation. US1K-TP has Vf of 1.7 V @ 1 A, while CGRA4006-G has 1.1 V @ 1 A. Lower forward voltage reduces power loss (P = Vf × I). In high-current or continuous-duty applications, lower Vf substitutes reduce thermal stress. Verify thermal design margins in the application.

Q: Can I use GF1M-E3/5CA in place of US1K-TP?

A: GF1M-E3/5CA is functionally compatible (800 V / 1 A rating) but differs in package (DO-214BA vs. DO-214AC) and recovery characteristics (standard vs. fast). PCB footprint must be verified. Standard recovery time (2 µs) is acceptable for non-switching applications. Active product status ensures availability.

Q: What does "Not For New Designs" status mean?

A: "Not For New Designs" indicates the part has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available, but long-term supply is not guaranteed. For new designs or legacy system support, Active-status alternatives (CGRA4006-G, RS1K series, GF1M-E3 series) are preferred.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant and REACH Unaffected, matching the regulatory compliance of the original US1K-TP. No additional compliance verification is required for RoHS or REACH regulations.

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