US2KA Equivalent & Substitute Parts

Part Overview

The US2KA is a general-purpose rectifier diode manufactured by onsemi, rated for 800 V DC reverse voltage with 1.5 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for legacy system support, design continuity, and procurement flexibility when the primary part becomes unavailable or when alternative sourcing is required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 1.5	V @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of rectifier diodes is determined by the following critical parameters:

Voltage Rating (Vr): All substitute parts must equal or exceed the 800 V DC reverse voltage specification.
Current Rating (Io): Substitute parts must support the required 1.5 A average rectified current or higher.
Forward Voltage (Vf): Forward voltage drop must be compatible with circuit design requirements.
Recovery Characteristics: Speed classification (Fast Recovery vs. Standard Recovery) affects switching performance and EMI behavior.
Package Compatibility: All parts must use the DO-214AC (SMA) surface mount package for mechanical and thermal compatibility.
Temperature Range: Operating junction temperature range must accommodate the application environment.
Compliance & Certification: RoHS3 compliance and automotive qualification (AEC-Q101) where applicable.

Substitute parts are grouped into two categories:

Parametric Equivalents (identical electrical specifications): NRVUS2KA and HS2KA provide full electrical and thermal equivalence with identical 1.5 A current rating and fast recovery characteristics.

Similar Parts (reduced current rating): US1KHE3_A/I and MRA4006T3G operate at reduced current ratings (1 A) but maintain the 800 V voltage rating and DO-214AC package. These are suitable only for applications where the lower current rating is acceptable.

Parameter Comparison

Parameter	US2KA (onsemi)	NRVUS2KA (onsemi)	HS2KA (TSC)	US1KHE3_A/I (Vishay)	MRA4006T3G (onsemi)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 1.5 A	1.7 V @ 1.5 A	1.7 V @ 1.5 A	1.7 V @ 1 A	1.1 V @ 1 A
Speed	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Standard Recovery >500ns
Reverse Recovery Time (trr)	75 ns	75 ns	75 ns	75 ns	—
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 V	10 µA @ 800 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	—
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 175°C
Product Status	Not For New Designs	Not For New Designs	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Qualification	—	AEC-Q101	—	AEC-Q101	—

Engineering Selection Recommendations

For Direct Replacement (Full Electrical Equivalence):

NRVUS2KA and HS2KA are the primary substitutes for US2KA. Both maintain identical 1.5 A current rating, 800 V voltage rating, fast recovery characteristics (75 ns trr), and DO-214AC package compatibility. NRVUS2KA carries AEC-Q101 automotive qualification, making it suitable for automotive applications. HS2KA is manufactured by Taiwan Semiconductor Corporation and maintains Active product status, providing long-term availability assurance. Both parts are ROHS3 compliant and have unlimited moisture sensitivity level (MSL 1).

For Reduced Current Applications:

US1KHE3_A/I (Vishay) and MRA4006T3G (onsemi) are suitable only when the application current requirement is 1 A or lower. US1KHE3_A/I is Active status with AEC-Q101 qualification and fast recovery characteristics. MRA4006T3G operates with Standard Recovery (>500ns) and extended temperature range (-55 to 175°C), but is classified as Not For New Designs. Both maintain 800 V voltage rating and DO-214AC package compatibility.

Compliance Considerations:

All substitute parts are ROHS3 compliant and REACH unaffected. For automotive applications requiring AEC-Q101 qualification, NRVUS2KA and US1KHE3_A/I are the appropriate selections. For general industrial applications, HS2KA provides Active product status with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can US1KHE3_A/I or MRA4006T3G be used as direct replacements for US2KA?

A: No. US1KHE3_A/I and MRA4006T3G are rated for 1 A average rectified current, while US2KA is rated for 1.5 A. These parts are suitable only for applications where the circuit current requirement does not exceed 1 A. Using a lower-rated diode in a higher-current application will result in component failure.

Q: What is the difference between NRVUS2KA and HS2KA?

A: Both parts are parametric equivalents with identical electrical specifications (1.5 A, 800 V, 75 ns recovery time, DO-214AC package). NRVUS2KA is manufactured by onsemi with AEC-Q101 automotive qualification. HS2KA is manufactured by Taiwan Semiconductor Corporation and maintains Active product status. Selection depends on supply chain requirements and automotive qualification needs.

Q: Why does MRA4006T3G have a lower forward voltage (1.1 V @ 1 A) compared to US2KA (1.7 V @ 1.5 A)?

A: Forward voltage is measured at the rated current of each device. MRA4006T3G is rated for 1 A, while US2KA is rated for 1.5 A. Forward voltage increases with current. The lower measurement for MRA4006T3G reflects its lower current rating, not superior performance. Direct comparison requires evaluating voltage drop at equivalent current levels.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and thermal compatibility with existing PCB designs. Tape & Reel (TR) and Cut Tape (CT) packaging options may vary by supplier; verify packaging format with the distributor.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active development and recommends against using the part in new product designs. However, the part remains available for legacy system support and repair. For new designs, select parts with Active status such as HS2KA or US1KHE3_A/I.

Q: Can MRA4006T3G be used in applications requiring fast recovery characteristics?

A: No. MRA4006T3G operates with Standard Recovery (>500ns), while US2KA, NRVUS2KA, HS2KA, and US1KHE3_A/I all feature Fast Recovery (≤500ns). Standard recovery diodes are unsuitable for high-frequency switching applications where fast recovery is required to minimize switching losses and EMI.

Q: What is the temperature operating range difference between MRA4006T3G and other substitutes?

A: MRA4006T3G operates from -55°C to 175°C, while US2KA, NRVUS2KA, HS2KA, and US1KHE3_A/I operate from -55°C to 150°C. MRA4006T3G provides extended high-temperature capability, suitable for applications with elevated ambient or junction temperatures.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is required for automotive applications and applications subject to automotive reliability standards. NRVUS2KA and US1KHE3_A/I carry this qualification. For non-automotive industrial applications, AEC-Q101 qualification is not necessary.

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