FS1K-LTP Equivalent & Substitute Parts

Part Overview

The FS1K-LTP 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 DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, legacy system support, and procurement of functionally compatible alternatives from active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-50 to 150	°C
Product Status	Not For New Designs	—

Substitute Part Grouping Explanation

Substitution of the FS1K-LTP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.3 V or lower @ 1 A
Reverse Recovery Time (trr): 500 ns or faster
Current - Reverse Leakage @ Vr: 5 µA or lower @ rated voltage
Mounting Type: Surface Mount
Package / Case: DO-214AC (SMA) or compatible footprint

Direct Equivalents maintain all electrical parameters within specification and use identical or footprint-compatible packages (DO-214AC/SMA).

Similar Substitutes meet or exceed the primary electrical requirements but may employ different package variants (DO-214BA) or higher voltage ratings (1000 V). These parts are functionally compatible for applications where the FS1K-LTP is specified, provided PCB layout accommodates the package change.

Parameter Comparison

Parameter	FS1K-LTP (Main)	RS1K	RS1K-13-F	GF1K-E3/67A	GF1M-E3/67A	GF1M-E3/5CA
Manufacturer	Micro Commercial Co	Fairchild Semiconductor	Diodes Incorporated	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	1000 V	1000 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A	1.2 V @ 1 A	1.2 V @ 1 A	1.2 V @ 1 A
Reverse Recovery Time (trr)	500 ns	500 ns	500 ns	2 µs	2 µs	2 µs
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 1000 V	5 µA @ 1000 V
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	—	—
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214BA	DO-214BA	DO-214BA
Operating Temperature - Junction	-50 to 150 °C	-55 to 150 °C	-65 to 150 °C	-65 to 175 °C	-65 to 175 °C	-65 to 175 °C
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Preferred for Pin-Compatible Replacement):

RS1K (Fairchild Semiconductor) and RS1K-13-F (Diodes Incorporated) are direct electrical and package equivalents to the FS1K-LTP. Both maintain 800 V / 1 A ratings, 500 ns reverse recovery time, and DO-214AC (SMA) surface mount packaging. Both manufacturers' parts carry Active product status and ROHS3 compliance. RS1K-13-F offers extended lower operating temperature range (-65°C vs. -55°C) and is available in Tape & Reel packaging, matching the FS1K-LTP procurement format.

Similar Substitutes (Package Variant Consideration Required):

GF1K-E3/67A (Vishay) maintains the 800 V / 1 A electrical specification but uses DO-214BA (GF1) package instead of DO-214AC (SMA). This package change requires PCB layout verification for footprint compatibility. The part offers improved forward voltage (1.2 V vs. 1.3 V) and extended temperature range (-65 to 175°C). Product status is Active with ROHS3 compliance.

GF1M-E3/67A and GF1M-E3/5CA (Vishay) provide higher voltage rating (1000 V) with identical 1 A current and 1.2 V forward voltage. Both use DO-214BA package. These parts are suitable for applications where voltage margin is beneficial. GF1M-E3/67A is available in Tape & Reel; GF1M-E3/5CA is supplied in Cut Tape & Digi-Reel format. Both are Active status with ROHS3 compliance.

Compliance and Regulatory Status:

All substitute parts listed carry ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, matching the regulatory profile of the FS1K-LTP. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all parts, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can RS1K directly replace FS1K-LTP without PCB modification?

A: Yes. RS1K is a direct electrical and package equivalent. Both use DO-214AC (SMA) surface mount package with identical pinout and footprint. No PCB layout changes are required.

Q: What is the difference between RS1K-13-F and RS1K?

A: Both are electrically identical 800 V / 1 A fast recovery diodes in DO-214AC (SMA) package. RS1K-13-F is manufactured by Diodes Incorporated and offers extended lower operating temperature range (-65°C vs. -55°C minimum). RS1K is from Fairchild Semiconductor. Selection depends on temperature requirements and supplier availability.

Q: Why do GF1K-E3/67A and GF1M-E3/67A use a different package (DO-214BA)?

A: DO-214BA (GF1) is a different surface mount package variant from DO-214AC (SMA), though both are single-diode surface mount packages. The footprints are not identical. PCB layout must be verified for compatibility before substitution. Consult package datasheets for dimensional specifications.

Q: Can I use GF1M-E3/67A (1000 V) in place of FS1K-LTP (800 V)?

A: Yes, from an electrical standpoint. The higher voltage rating (1000 V) provides additional voltage margin and is functionally compatible in 800 V applications. However, the DO-214BA package requires PCB footprint verification. Confirm that the application circuit design does not depend on the specific 800 V rating or the DO-214AC package form factor.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the FS1K-LTP regulatory status. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the significance of reverse recovery time (trr) differences?

A: FS1K-LTP, RS1K, and RS1K-13-F specify 500 ns fast recovery time. GF1K-E3/67A, GF1M-E3/67A, and GF1M-E3/5CA specify 2 µs standard recovery time. Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification. Application frequency requirements determine whether the recovery time difference is significant.

Q: What does "Not For New Designs" status mean for FS1K-LTP?

A: This designation indicates the FS1K-LTP 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. Substitution with Active-status parts (RS1K, RS1K-13-F, GF1K-E3/67A, GF1M-E3/67A, GF1M-E3/5CA) ensures design continuity and future supply security.

Q: How do I verify package compatibility between DO-214AC and DO-214BA?

A: Obtain the package outline drawings from manufacturer datasheets for both DO-214AC (SMA) and DO-214BA (GF1). Compare lead pitch, body dimensions, and pad layout. Consult your PCB design tool's component library to confirm footprint compatibility. Physical sample evaluation is recommended before production implementation.

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