S1K Equivalent & Substitute Parts

Part Overview

The onsemi S1K is a general-purpose rectifier diode rated for 800 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This device is classified as "Not For New Designs," indicating it is an established product no longer recommended for new circuit development. Identification of equivalent and substitute parts is necessary for legacy system support, maintenance applications, and situations where alternative sourcing is required due to inventory constraints or supply chain considerations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	1	µA @ 800 V
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the S1K is determined by the following critical parameters:

Voltage Rating: The reverse voltage rating must equal or exceed 800 V. Parts rated at 1000 V (1 kV) are acceptable as they provide higher voltage margin.

Current Rating: The average rectified current must equal or exceed 1 A at the specified operating conditions.

Package Type: The part must be surface mount in either DO-214AC (SMA) or DO-214BA (GF1) package configurations, as these are mechanically and electrically compatible with the original footprint.

Forward Voltage: Forward voltage drop at 1 A must not exceed 1.1 V for direct substitution. Parts with forward voltage up to 1.2 V are acceptable for applications with relaxed voltage drop requirements.

Recovery Characteristics: Standard recovery (>500 ns) or faster recovery (≤500 ns) are both acceptable. Reverse recovery time specifications are provided for reference but do not restrict substitution.

Temperature Range: Operating junction temperature range of -55°C to 150°C or wider is required.

Compliance: RoHS3 compliance and MSL 1 rating are mandatory for all substitutes.

Substitute parts are grouped into three categories: Similar Manufacturer Parts (functionally equivalent with minor parameter variations), Parametric Equivalents (identical electrical specifications with different packaging or qualification), and Direct Manufacturer Parts (alternative sourcing from different manufacturers with equivalent performance).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	Speed	trr [µs]	Ir @ Vr [µA]	Package	Tj Range [°C]	Product Status
S1K	onsemi	800	1	1.1	Standard >500ns	1.8	1 @ 800V	DO-214AC (SMA)	-55 to 150	Not For New Designs
MRA4006T3G	onsemi	800	1	1.1	Standard >500ns	-	10 @ 800V	DO-214AC (SMA)	-55 to 175	Not For New Designs
S1M	EVVO Semi	1000	1	1.1	Standard >500ns	-	5 @ 1kV	DO-214AC (SMA)	-55 to 150	Active
NRVA4006T3G	onsemi	800	1	1.1	Standard >500ns	-	10 @ 800V	DO-214AC (SMA)	-55 to 150	Not For New Designs
US1K-13-F	Diodes Incorporated	800	1	1.7	Fast ≤500ns	0.075	5 @ 800V	DO-214AC (SMA)	-65 to 150	Active
CGRA4006-G	Comchip Technology	800	1	1.1	Fast ≤500ns	-	5 @ 800V	DO-214AC (SMA)	-55 to 150	Active
GF1K-E3/67A	Vishay General Semiconductor	800	1	1.2	Standard >500ns	2.0	5 @ 800V	DO-214BA (GF1)	-65 to 175	Active
GF1M-E3/5CA	Vishay General Semiconductor	1000	1	1.2	Standard >500ns	2.0	5 @ 1000V	DO-214BA (GF1)	-65 to 175	Active
GF1M-E3/67A	Vishay General Semiconductor	1000	1	1.2	Standard >500ns	2.0	5 @ 1000V	DO-214BA (GF1)	-65 to 175	Active
S1K-13-F	Diodes Incorporated	800	1	1.1	Standard >500ns	3.0	5 @ 800V	DO-214AC (SMA)	-65 to 150	Active
S1M-13-F	Diodes Incorporated	1000	1	1.1	Standard >500ns	3.0	5 @ 1000V	DO-214AC (SMA)	-65 to 150	Active

Engineering Selection Recommendations

For Direct Replacement (800 V, 1 A, DO-214AC SMA Package):

S1K-13-F (Diodes Incorporated) is the primary direct substitute. It maintains identical voltage and current ratings, equivalent forward voltage characteristics, and is classified as Active product status. This part provides the most straightforward replacement path with no design modifications required.

CGRA4006-G (Comchip Technology) is an alternative direct replacement with identical electrical specifications and Active product status. This part features faster recovery characteristics (≤500 ns) compared to the S1K standard recovery specification.

For Higher Voltage Margin Applications (1000 V, 1 A, DO-214AC SMA Package):

S1M-13-F (Diodes Incorporated) provides 200 V additional reverse voltage rating while maintaining 1 A current capacity and equivalent forward voltage. This part is Active and suitable for applications requiring enhanced voltage margin.

S1M (EVVO Semi) offers 1000 V rating with Active product status. This part is available in higher inventory quantities and provides voltage margin for legacy system support.

For DO-214BA (GF1) Package Applications:

GF1K-E3/67A (Vishay General Semiconductor) is rated for 800 V, 1 A with DO-214BA package. This part is Active and features extended temperature range (-65°C to 175°C). Forward voltage is 1.2 V at 1 A, acceptable for applications with relaxed voltage drop requirements.

GF1M-E3/67A (Vishay General Semiconductor) provides 1000 V rating in DO-214BA package with Active status and extended temperature range. This part is suitable for applications requiring both higher voltage and alternative package configuration.

For Fast Recovery Applications:

US1K-13-F (Diodes Incorporated) features fast recovery (≤500 ns, 75 ns trr) with 800 V, 1 A rating. Forward voltage is 1.7 V at 1 A. This part is Active and suitable for high-frequency switching applications where recovery speed is critical. Forward voltage drop is higher than the S1K and must be evaluated for thermal impact.

Compliance and Qualification:

All recommended substitutes are RoHS3 compliant and MSL 1 rated. NRVA4006T3G includes AEC-Q101 automotive qualification for applications requiring automotive-grade components. MRA4006T3G and NRVA4006T3G are onsemi products with extended temperature range to 175°C, suitable for elevated ambient temperature environments.

Frequently Asked Questions (FAQ)

Q: Can S1K-13-F be used as a direct replacement for S1K?

A: Yes. S1K-13-F (Diodes Incorporated) is a direct substitute with identical 800 V, 1 A ratings, equivalent forward voltage (1.1 V @ 1 A), and compatible DO-214AC (SMA) package. Both parts are surface mount with standard recovery characteristics. The primary difference is product status: S1K is "Not For New Designs" while S1K-13-F is Active.

Q: What is the difference between DO-214AC (SMA) and DO-214BA (GF1) packages?

A: Both are surface mount packages for 1 A rectifier diodes. DO-214AC (SMA) is the standard package used by onsemi, Diodes Incorporated, and EVVO Semi. DO-214BA (GF1) is the Vishay package designation for equivalent functionality. Physical dimensions and PCB footprints differ between these packages. Substitution between package types requires PCB layout modification.

Q: Can I use S1M or S1M-13-F (1000 V) in place of S1K (800 V)?

A: Yes. S1M and S1M-13-F are rated for 1000 V reverse voltage, which exceeds the S1K 800 V requirement. Both maintain 1 A current rating and equivalent forward voltage (1.1 V @ 1 A). These parts provide 200 V additional voltage margin and are suitable for direct substitution in applications where the circuit design permits higher voltage-rated components.

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

A: Forward voltage affects power dissipation and voltage drop across the diode. S1K and most substitutes are rated at 1.1 V @ 1 A. GF1K-E3/67A and GF1M-E3/67A are rated at 1.2 V @ 1 A (0.1 V higher). US1K-13-F is rated at 1.7 V @ 1 A (0.6 V higher due to fast recovery design). Higher forward voltage increases heat generation. Applications with tight thermal budgets or high current duty cycles must account for this difference.

Q: Are there inventory considerations for substitute selection?

A: Yes. Inventory levels vary significantly. S1K-13-F has 215,900 units in stock. S1M-13-F has 190,400 units. NRVA4006T3G has 50,200 units. GF1M-E3/67A has 7,790 units. CGRA4006-G has only 724 units. For applications requiring large quantities or long-term supply assurance, parts with higher inventory levels are preferred.

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

A: "Not For New Designs" indicates the manufacturer no longer recommends this part for new circuit development. The part remains available for legacy system support and maintenance. For new designs, Active status parts such as S1K-13-F, S1M-13-F, CGRA4006-G, or Vishay GF1 series are preferred. Active status parts receive ongoing manufacturer support and are expected to remain available for extended periods.

Q: Can US1K-13-F be used in all applications where S1K is used?

A: US1K-13-F has identical voltage and current ratings but differs in recovery speed (fast recovery ≤500 ns vs. standard recovery >500 ns) and forward voltage (1.7 V vs. 1.1 V). The fast recovery characteristic is beneficial for high-frequency switching applications. The higher forward voltage increases power dissipation. Applications with low-frequency operation or tight thermal constraints should evaluate the forward voltage impact before substitution.

Q: What does AEC-Q101 qualification mean for NRVA4006T3G?

A: AEC-Q101 is the Automotive Electronics Council qualification standard for discrete semiconductors. NRVA4006T3G meets this qualification, indicating it is suitable for automotive applications with defined reliability and performance requirements. Non-automotive applications do not require AEC-Q101 qualification, but this certification provides assurance of manufacturing quality and consistency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and MSL 1 rated. RoHS3 compliance confirms the absence of restricted substances (lead, cadmium, mercury, hexavalent chromium, PBBs, PBDEs). MSL 1 rating indicates unlimited shelf life with no moisture sensitivity precautions required during storage or handling.

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