HT15G A1G Equivalent & Substitute Parts

Part Overview

The HT15G 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 T-18 axial package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design support and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts satisfy the same functional requirements within the allowed parameter tolerances for this diode category.

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)	50	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Capacitance @ Vr, F	15 @ 4V, 1MHz	pF
Mounting Type	Through Hole	—
Package / Case	T-18, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HT15G A1G is determined by strict equivalence in the following critical parameters: voltage rating (400 V DC reverse), current rating (1 A average rectified), forward voltage drop (1.3 V maximum at 1 A), package type (T-18 axial through-hole), and operating temperature range (-55°C to 150°C). All substitute parts listed maintain these core electrical and mechanical specifications.

Substitute parts are grouped into two categories based on additional qualifications:

Category 1: Direct Electrical Equivalents — Parts maintaining identical reverse recovery time (50 ns) and capacitance (15 pF @ 4V, 1MHz) specifications.

Category 2: Parametric Equivalents — Parts with relaxed reverse recovery time (150 ns or 35 ns) and/or modified capacitance (10 pF @ 4V, 1MHz), which remain functionally compatible within standard rectifier diode application tolerances. Automotive-grade variants with AEC-Q101 qualification are included where applicable.

All substitute parts are manufactured by Taiwan Semiconductor Corporation, comply with ROHS3 and REACH requirements, and are classified as active products with current inventory availability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Reverse Leakage @ Vr	Capacitance @ Vr, F	Package	Product Status	Grade	Inventory (Pcs)
HT15G A1G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	50 ns	5 µA @ 400 V	15 pF @ 4V, 1MHz	T-18, Axial	Discontinued	Standard	722
HT15G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	50 ns	5 µA @ 400 V	15 pF @ 4V, 1MHz	T-18, Axial	Active	Standard	650
F1T4G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150 ns	5 µA @ 400 V	15 pF @ 4V, 1MHz	T-18, Axial	Active	Standard	1083
F1T4GHA0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150 ns	5 µA @ 400 V	15 pF @ 4V, 1MHz	T-18, Axial	Active	Automotive	747
F1T4GHA1G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	150 ns	5 µA @ 400 V	15 pF @ 4V, 1MHz	T-18, Axial	Active	Automotive	946
SFT16G A0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	35 ns	5 µA @ 400 V	10 pF @ 4V, 1MHz	T-18, Axial	Active	Standard	964
SFT16GHA0G	Taiwan Semiconductor Corporation	400 V	1 A	1.3 V @ 1 A	35 ns	5 µA @ 400 V	10 pF @ 4V, 1MHz	T-18, Axial	Active	Automotive	1060

Engineering Selection Recommendations

Primary Substitute: HT15G A0G

The HT15G A0G is the direct equivalent to the HT15G A1G, maintaining identical electrical specifications including reverse recovery time (50 ns) and capacitance (15 pF). This part is currently active and available with 650 units in stock. Selection of HT15G A0G eliminates any parametric deviation and is recommended for applications requiring exact specification matching.

Secondary Substitutes: F1T4G A0G, F1T4GHA0G, F1T4GHA1G

The F1T4 series parts satisfy all core electrical requirements (400 V, 1 A, 1.3 V forward drop) with extended reverse recovery time (150 ns). These parts are suitable for applications where faster switching is not critical. The automotive-grade variants (F1T4GHA0G, F1T4GHA1G) carry AEC-Q101 qualification and are appropriate for automotive and mission-critical applications. Inventory availability ranges from 747 to 1083 units.

Tertiary Substitutes: SFT16G A0G, SFT16GHA0G

The SFT16 series provides superior switching performance with reduced reverse recovery time (35 ns) and lower capacitance (10 pF), making these parts suitable for high-frequency rectification applications. The automotive-grade variant (SFT16GHA0G) is AEC-Q101 qualified. Inventory availability is 964 and 1060 units respectively.

All substitute parts comply with ROHS3 and REACH requirements, feature identical through-hole T-18 axial packaging, and operate across the same temperature range (-55°C to 150°C).

Frequently Asked Questions (FAQ)

Q: Can HT15G A0G be used as a direct replacement for HT15G A1G?

A: Yes. HT15G A0G is electrically and mechanically identical to HT15G A1G, with matching voltage rating (400 V), current rating (1 A), forward voltage (1.3 V @ 1 A), reverse recovery time (50 ns), and package type (T-18 axial). The only difference is product status: HT15G A0G is active while HT15G A1G is discontinued.

Q: What is the difference between standard and automotive-grade variants?

A: Automotive-grade variants (F1T4GHA0G, F1T4GHA1G, SFT16GHA0G) carry AEC-Q101 qualification, indicating compliance with automotive industry reliability and quality standards. Standard-grade parts (F1T4G A0G, SFT16G A0G) do not carry this qualification. Selection depends on application requirements; automotive applications typically require AEC-Q101 certification.

Q: How does reverse recovery time affect part selection?

A: Reverse recovery time (trr) determines switching speed. The HT15G A1G has 50 ns trr. Substitute parts with longer trr (F1T4 series at 150 ns) are suitable for lower-frequency applications. Substitute parts with shorter trr (SFT16 series at 35 ns) are suitable for higher-frequency rectification. All values remain within standard rectifier diode performance ranges.

Q: Are all substitute parts compatible with the T-18 axial through-hole footprint?

A: Yes. All listed substitute parts use T-18 axial through-hole packaging, ensuring mechanical and footprint compatibility with the original HT15G A1G design.

Q: What compliance certifications apply to all parts?

A: All parts listed are ROHS3 compliant and REACH unaffected. Automotive-grade variants additionally carry AEC-Q101 qualification. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: Which substitute part offers the best availability?

A: F1T4G A0G has the highest inventory at 1083 units. SFT16GHA0G follows with 1060 units. All substitute parts maintain active product status with current stock.

Q: Can capacitance differences between parts affect circuit performance?

A: The HT15G A1G has 15 pF capacitance at 4V, 1MHz. SFT16 series parts have 10 pF at the same conditions. This 5 pF difference is within standard tolerance for general-purpose rectifier applications. Verification is required only for high-frequency or precision timing-sensitive circuits.

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