SR1204H Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR1204H is a 40V, 12A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-201AD axial through-hole packaging. This component is classified as a fast recovery diode with a maximum forward voltage of 550 mV at 12A and is designed for high-current rectification applications. The part carries AEC-Q101 automotive qualification and is RoHS3 compliant. Alternative equivalent and substitute parts are necessary when the primary part number becomes unavailable, when different packaging formats are required, or when sourcing from alternative manufacturers is preferred while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	12	A
Voltage - Forward (Vf) Maximum @ If	550 mV @ 12 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 40 V	µA
Technology	Schottky	—
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-50°C to 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SR1204H is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 40V (exact match required)
Technology: Schottky (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: DO-201AD, Axial (exact match required)
Current - Average Rectified (Io): 12A minimum (equal or greater)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (exact match required)

Substitution Categories:

Category 1 - Parametric Equivalent (Identical Specifications): Parts with identical electrical ratings and packaging. The SR1204 in Cut Tape packaging is a direct parametric equivalent, differing only in packaging format (Cut Tape versus Tape & Reel).

Category 2 - Functional Substitute (Lower Current Rating): Parts with 40V reverse voltage, Schottky technology, DO-201AD packaging, and fast recovery speed but with current ratings below 12A (3A to 5A). These parts are suitable for applications where the full 12A rating is not required. This category includes 1N5822 variants and SB540 variants.

Category 3 - Functional Substitute (Intermediate Current Rating): Parts with 40V reverse voltage, Schottky technology, DO-201AD packaging, and fast recovery speed with 5A current rating. These parts bridge the gap between lower-rated 3A devices and the 12A main part.

All substitute parts maintain Schottky technology, fast recovery speed classification, and through-hole DO-201AD axial packaging. Substitution is not permitted across different voltage ratings, package types, or mounting technologies.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA]	Package	Temp Range [°C]	RoHS Status
SR1204H	Taiwan Semiconductor Corporation	40	12	550 @ 12A	Fast Recovery ≤ 500ns	500 @ 40V	DO-201AD	-50 to 150	ROHS3
SR1204	Taiwan Semiconductor Corporation	40	12	550 @ 12A	Fast Recovery ≤ 500ns	500 @ 40V	DO-201AD	-50 to 150	ROHS3
1N5822	Microchip Technology	40	3	500 @ 3A	Fast Recovery ≤ 500ns	100 @ 40V	B, Axial	-65 to 125	Non-compliant
1N5822-E3/54	Vishay General Semiconductor - Diodes Division	40	3	525 @ 3A	Fast Recovery ≤ 500ns	2000 @ 40V	DO-201AD	-65 to 125	ROHS3
1N5822-E3/73	Vishay General Semiconductor - Diodes Division	40	3	525 @ 3A	Fast Recovery ≤ 500ns	2000 @ 40V	DO-201AD	-65 to 125	ROHS3
1N5822-TP	Micro Commercial Co	40	3	525 @ 3A	Fast Recovery ≤ 500ns	500 @ 40V	DO-201AD	-55 to 125	ROHS3
1N5822RL	STMicroelectronics	40	3	525 @ 3A	Fast Recovery ≤ 500ns	2000 @ 40V	DO-201AD	-65 to 150	ROHS3
SB540-E3/54	Vishay General Semiconductor - Diodes Division	40	5	480 @ 5A	Fast Recovery ≤ 500ns	500 @ 40V	DO-201AD	-65 to 150	ROHS3
SB540-E3/73	Vishay General Semiconductor - Diodes Division	40	5	480 @ 5A	Fast Recovery ≤ 500ns	500 @ 40V	DO-201AD	-65 to 150	ROHS3
SB540-T	Diodes Incorporated	40	5	550 @ 5A	Fast Recovery ≤ 500ns	500 @ 40V	DO-201AD	-65 to 125	ROHS3
STPS5L40	STMicroelectronics	40	5	500 @ 5A	Fast Recovery ≤ 500ns	200 @ 40V	DO-201AD	-65 to 150	ROHS3

Engineering Selection Recommendations

Direct Parametric Equivalent:

The SR1204 (Cut Tape packaging) is the direct parametric equivalent to the SR1204H. Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications: 40V reverse voltage, 12A average rectified current, 550 mV forward voltage at 12A, and fast recovery speed. The only difference is packaging format (Cut Tape versus Tape & Reel). This part is suitable for direct substitution in all applications where the SR1204H is specified.

Functional Substitutes with Current Derating:

The 1N5822 series (1N5822, 1N5822-E3/54, 1N5822-E3/73, 1N5822-TP, 1N5822RL) and SB540 series (SB540-E3/54, SB540-E3/73, SB540-T, STPS5L40) are functional substitutes with lower current ratings. All maintain the 40V reverse voltage, Schottky technology, DO-201AD axial packaging, and fast recovery speed classification required for compatibility.

The 1N5822 variants are rated at 3A average rectified current. These parts are suitable for applications where the circuit design does not require the full 12A capability of the SR1204H. All 1N5822 variants carry RoHS3 compliance except the Microchip Technology 1N5822 (Bulk packaging), which is RoHS non-compliant.

The SB540 variants are rated at 5A average rectified current. These parts provide an intermediate current rating between the 3A 1N5822 devices and the 12A SR1204H. All SB540 variants carry RoHS3 compliance and are suitable for applications requiring higher current than 3A but not exceeding 5A.

Compliance and Qualification:

The SR1204H carries AEC-Q101 automotive qualification. Among the substitute parts, only the SR1204 (Cut Tape) shares this automotive qualification status. The 1N5822 and SB540 variants do not carry explicit AEC-Q101 qualification in the provided specifications. Applications requiring automotive qualification should prioritize the SR1204 equivalent.

All recommended substitutes are RoHS3 compliant and REACH unaffected, matching the environmental compliance profile of the SR1204H.

Temperature Operating Range:

The SR1204H operates from -50°C to 150°C. The SR1204 equivalent maintains this range. Most substitute parts operate from -65°C to 125°C or -65°C to 150°C, providing either extended low-temperature capability or matching high-temperature performance. The SB540-T variant operates from -65°C to 125°C, which does not extend the high-temperature range of the SR1204H.

Frequently Asked Questions (FAQ)

Q: Can I use a 1N5822 (3A) in place of an SR1204H (12A)?

A: The 1N5822 is a functional substitute only for applications where the circuit current requirement does not exceed 3A. The 1N5822 maintains the same 40V reverse voltage, Schottky technology, DO-201AD packaging, and fast recovery speed as the SR1204H. However, it is rated for only 3A average rectified current compared to the SR1204H's 12A rating. Using a 1N5822 in a circuit designed for 12A operation will result in device failure due to exceeding the current rating. Current derating must be verified before substitution.

Q: What is the difference between SR1204H and SR1204?

A: The SR1204H and SR1204 are parametrically identical parts manufactured by Taiwan Semiconductor Corporation. Both are rated at 40V, 12A, with 550 mV forward voltage at 12A, fast recovery speed, and DO-201AD axial packaging. The difference is in packaging format: SR1204H is supplied in Tape & Reel (TR) format, while SR1204 is supplied in Cut Tape (CT) format. Both carry RoHS3 compliance and identical electrical specifications. Selection between them depends on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts except the Microchip Technology 1N5822 (Bulk packaging) are RoHS3 compliant. The Microchip 1N5822 is RoHS non-compliant and should not be used in applications requiring RoHS compliance. All other variants of the 1N5822 series and all SB540 variants carry RoHS3 compliance matching the SR1204H.

Q: Can I use an SB540 (5A) instead of an SR1204H (12A)?

A: The SB540 series (SB540-E3/54, SB540-E3/73, SB540-T, STPS5L40) is a functional substitute only for applications where the circuit current requirement does not exceed 5A. All SB540 variants maintain the 40V reverse voltage, Schottky technology, DO-201AD packaging, and fast recovery speed of the SR1204H. However, they are rated for 5A average rectified current, not 12A. Substitution is valid only when circuit design allows current derating to 5A or below.

Q: Does the SR1204H have automotive qualification?

A: Yes, the SR1204H carries AEC-Q101 automotive qualification. Among the substitute parts provided, only the SR1204 (Cut Tape packaging) shares this automotive qualification. The 1N5822 and SB540 variants do not carry explicit AEC-Q101 qualification in the provided specifications. For applications requiring automotive-grade components, the SR1204 is the recommended substitute.

Q: What is the difference between DO-201AD and B axial packages?

A: Both DO-201AD and B are axial through-hole package designations for diodes. The DO-201AD is the standardized package designation used by most manufacturers for this form factor. The Microchip Technology 1N5822 is specified with B, Axial packaging, which is an alternative designation for the same physical package. These packages are mechanically compatible for through-hole mounting applications.

Q: Can I substitute parts with different forward voltage specifications?

A: Forward voltage differences between substitute parts are acceptable within the context of circuit design. The SR1204H has a maximum forward voltage of 550 mV at 12A. The 1N5822 variants have 500-525 mV at 3A, and the SB540 variants have 480-550 mV at 5A. Lower forward voltage values indicate better efficiency characteristics. Substitution is valid when the circuit design accommodates the forward voltage specification of the substitute part. Forward voltage differences do not prevent substitution but should be considered in power dissipation calculations.

Q: What is the significance of reverse leakage current specifications?

A: Reverse leakage current (Ir) is the small current that flows through the diode when reverse biased. The SR1204H specifies 500 µA at 40V. Substitute parts show variations: 1N5822 variants range from 100 µA to 2000 µA, and SB540 variants range from 200 µA to 500 µA. Higher reverse leakage indicates slightly higher standby power dissipation but does not prevent substitution. For most applications, these differences are negligible. Applications with strict power budget requirements should consider reverse leakage specifications during selection.

Q: Are there packaging format options for the SR1204H substitute?

A: Yes. The SR1204 is available in Cut Tape (CT) format as an alternative to the SR1204H Tape & Reel (TR) format. Both are parametrically identical. The 1N5822 series and SB540 series are available in Cut Tape format. The Microchip 1N5822 is available in Bulk packaging. Selection of packaging format depends on assembly process requirements: Tape & Reel for automated pick-and-place assembly, Cut Tape for semi-automated or manual assembly, and Bulk for manual assembly or kit applications.

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