F1T4G A1G Equivalent & Substitute Parts

Part Overview

The F1T4G A1G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 1 A average rectified current in a through-hole TS-1 axial package. This part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for existing designs.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A
Reverse Recovery Time (trr)	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Capacitance @ Vr, F	15 pF @ 4 V, 1 MHz
Mounting Type	Through Hole
Package / Case	T-18, Axial
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the F1T4G A1G are classified based on electrical parameter equivalence and product availability status. All substitute diodes maintain the core electrical specifications: 400 V maximum reverse voltage, 1 A average rectified current, 1.3 V maximum forward voltage at 1 A, and identical through-hole TS-1 axial packaging.

Substitution logic is organized into the following categories:

Direct Manufacturer Equivalent: Parts with identical electrical parameters and active product status, differing only in manufacturing date code or internal grade designation.

Parametric Equivalents (Standard Grade): Parts with identical core electrical specifications but improved performance characteristics (reduced reverse recovery time or capacitance), maintaining standard industrial grade qualification.

Parametric Equivalents (Automotive Grade): Parts with identical core electrical specifications and automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive reliability standards.

Key parameters determining substitution eligibility:

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

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr (ns)	Ir @ Vr	C @ Vr, F	Package	Product Status	Grade
F1T4G A1G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150	5 µA @ 400 V	15 pF @ 4 V, 1 MHz	T-18, Axial	Discontinued	Standard
F1T4G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150	5 µA @ 400 V	15 pF @ 4 V, 1 MHz	T-18, Axial	Active	Standard
F1T4GHA0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150	5 µA @ 400 V	15 pF @ 4 V, 1 MHz	T-18, Axial	Active	Automotive (AEC-Q101)
F1T4GHA1G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150	5 µA @ 400 V	15 pF @ 4 V, 1 MHz	T-18, Axial	Active	Automotive (AEC-Q101)
HT15G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	50	5 µA @ 400 V	15 pF @ 4 V, 1 MHz	T-18, Axial	Active	Standard
SFT16G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	35	5 µA @ 400 V	10 pF @ 4 V, 1 MHz	T-18, Axial	Active	Standard
SFT16GHA0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	35	5 µA @ 400 V	10 pF @ 4 V, 1 MHz	T-18, Axial	Active	Automotive (AEC-Q101)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The F1T4G A0G provides direct electrical equivalence with active product status. This part is the primary substitute for the discontinued F1T4G A1G, offering identical reverse recovery time (150 ns) and capacitance characteristics (15 pF @ 4 V, 1 MHz). Selection of this part requires no circuit redesign or performance re-evaluation.

For Automotive Applications:

The F1T4GHA0G and F1T4GHA1G are qualified to AEC-Q101 automotive standards while maintaining identical electrical specifications to the original part. These parts are suitable for applications requiring automotive-grade component certification. Both variants are in active production status.

For Improved Switching Performance (Reduced Reverse Recovery Time):

The HT15G A0G and SFT16G A0G series offer reduced reverse recovery times (50 ns and 35 ns respectively) compared to the original 150 ns specification. These parts maintain all other electrical parameters within specification and are suitable for applications where faster switching characteristics provide circuit benefits. The SFT16G A0G additionally provides reduced capacitance (10 pF @ 4 V, 1 MHz).

For Automotive Applications with Improved Switching Performance:

The SFT16GHA0G combines automotive-grade qualification (AEC-Q101) with the fastest reverse recovery time (35 ns) and lowest capacitance (10 pF @ 4 V, 1 MHz) among available substitutes. This part is appropriate for automotive designs requiring enhanced switching performance.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and identical through-hole TS-1 axial packaging, ensuring mechanical and environmental compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can F1T4G A0G be used as a direct replacement for F1T4G A1G?

A: Yes. The F1T4G A0G is electrically identical to the F1T4G A1G across all specified parameters: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, 150 ns reverse recovery time, and identical packaging. The primary difference is active product status versus discontinued status. No circuit modifications are required.

Q: What is the difference between standard grade and automotive grade (AEC-Q101) diodes?

A: Automotive-grade diodes (F1T4GHA0G, F1T4GHA1G, SFT16GHA0G) are qualified to AEC-Q101 standards, which specify enhanced reliability testing, traceability requirements, and quality assurance procedures required for automotive applications. Electrical parameters remain identical to standard-grade equivalents. Selection of automotive-grade parts is necessary only for applications requiring automotive certification compliance.

Q: Can I use a substitute with faster reverse recovery time (HT15G A0G or SFT16G A0G)?

A: Yes, provided the application circuit is compatible with faster switching characteristics. The HT15G A0G (50 ns trr) and SFT16G A0G (35 ns trr) both maintain all other electrical specifications within the original part's range. Faster reverse recovery time reduces switching losses and may improve circuit efficiency. No circuit redesign is required for mechanical or electrical compatibility, though circuit performance may improve.

Q: Are all substitute parts in the same TS-1 axial package?

A: Yes. All substitute parts listed use the T-18 axial through-hole package, identical to the original F1T4G A1G. Direct mechanical substitution is possible without PCB modifications.

Q: What is the significance of reduced capacitance in the SFT16G series?

A: The SFT16G A0G and SFT16GHA0G feature 10 pF capacitance at 4 V, 1 MHz, compared to 15 pF in other substitutes. Lower junction capacitance reduces switching transients and may improve high-frequency circuit performance. This characteristic is beneficial in applications with fast switching requirements or sensitive analog circuits.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), identical to the original F1T4G A1G. Environmental and regulatory compatibility is maintained across all substitutes.

Q: Which substitute should I select for a new design?

A: For new designs without automotive requirements, the SFT16G A0G provides the best performance characteristics with fastest reverse recovery time (35 ns) and lowest capacitance (10 pF). For automotive applications, the SFT16GHA0G combines automotive qualification with identical performance advantages. For cost-sensitive applications requiring only electrical equivalence, the F1T4G A0G is appropriate.

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