F1T4G Equivalent & Substitute Parts

Part Overview

The F1T4G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 1 A average rectified current. This through-hole component features a TS-1 package (T-18 axial configuration) and is classified as a fast recovery diode with a reverse recovery time of 150 ns. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative models may be required due to inventory availability, automotive-grade qualification needs, or improved performance characteristics such as reduced reverse recovery time.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Mounting Type	Through Hole	—
Package / Case	T-18, Axial	—
Operating Temperature - Junction	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the F1T4G is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 1 A
Current - Reverse Leakage @ Vr: 5 µA @ 400 V
Mounting Type: Through Hole
Package / Case: T-18, Axial
Operating Temperature - Junction: -55°C to 150°C

Performance Variation Parameters: Reverse Recovery Time (trr) and Capacitance @ Vr may vary within the fast recovery classification (≤500 ns, >200 mA). Substitute parts with improved (lower) reverse recovery time and reduced capacitance represent performance enhancements while maintaining full backward compatibility.

Qualification Variants: Automotive-grade variants with AEC-Q101 qualification are direct substitutes for standard-grade parts in applications where automotive compliance is required or beneficial.

Parameter Comparison

Parameter	F1T4G	F1T4GH	SFT16G	SFT16GH
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	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	1.3 V @ 1 A
Reverse Recovery Time (trr)	150 ns	150 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	T-18, Axial	T-18, Axial	T-18, Axial	T-18, Axial
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Grade	Standard	Automotive	Standard	Automotive
Qualification	—	AEC-Q101	—	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

F1T4GH Selection Criteria: The F1T4GH is a direct parametric equivalent to the F1T4G with identical electrical specifications and reverse recovery time. The distinction is automotive-grade qualification (AEC-Q101). Selection of F1T4GH is appropriate when automotive compliance is mandated by application requirements or design standards, while maintaining identical performance characteristics.

SFT16G Selection Criteria: The SFT16G provides improved performance over the F1T4G through reduced reverse recovery time (35 ns versus 150 ns) and lower capacitance (10 pF versus 15 pF). All other electrical parameters remain equivalent. This part is suitable for applications where faster switching performance is beneficial and the standard-grade qualification is acceptable.

SFT16GH Selection Criteria: The SFT16GH combines the performance improvements of the SFT16G (35 ns reverse recovery time, 10 pF capacitance) with automotive-grade qualification (AEC-Q101). This part is selected when both enhanced switching performance and automotive compliance are required.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and REACH unaffected status. No compliance degradation occurs with any substitute selection.

Frequently Asked Questions (FAQ)

Q: Can F1T4G be replaced with F1T4GH in a standard industrial application?

A: Yes. The F1T4GH is a direct parametric equivalent with identical electrical performance. The automotive-grade qualification does not degrade performance in standard applications and represents an enhancement in manufacturing rigor.

Q: What is the primary difference between F1T4G and SFT16G?

A: The SFT16G features improved reverse recovery time (35 ns versus 150 ns) and reduced capacitance (10 pF versus 15 pF). All other electrical parameters, including voltage rating, current rating, and forward voltage drop, are identical. The SFT16G is suitable for applications requiring faster switching characteristics.

Q: Are SFT16G and SFT16GH pin-compatible with F1T4G?

A: Yes. All substitute parts use the T-18 axial through-hole package configuration. Mechanical and electrical pin compatibility is maintained across all four part numbers.

Q: Can SFT16GH be used in place of F1T4G in automotive applications?

A: Yes. The SFT16GH provides both parametric equivalence and automotive-grade qualification (AEC-Q101). It is suitable for automotive applications requiring the improved performance characteristics of the SFT16 series.

Q: What is the inventory status of substitute parts?

A: F1T4GH: 5720 pcs; SFT16G: 5699 pcs; SFT16GH: 5742 pcs. All substitute parts are in active production with substantial stock availability.

Q: Does substitution with SFT16G or SFT16GH affect circuit design or PCB layout?

A: No. All substitute parts maintain identical package configuration (T-18 axial), mounting type (through hole), and electrical interface. No circuit redesign or PCB modification is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. F1T4GH, SFT16G, and SFT16GH are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1) and REACH unaffected status, matching the compliance profile of the F1T4G.

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