S1MHR3G Equivalent & Substitute Parts

Part Overview

The S1MHR3G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 1000 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

The S1MHR3G operates across a junction temperature range of -55°C to 175°C and meets automotive-grade qualification per AEC-Q101. Standard recovery characteristics with a reverse recovery time of 1.5 µs define its performance profile for general rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 1000 V
Operating Temperature - Junction	-55 to 175	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
AEC-Q101 Qualification	Yes	—

Substitute Part Grouping Explanation

Substitution of the S1MHR3G is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC (SMA) for direct footprint compatibility
Mounting Type: Surface Mount

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max): Substitute parts may vary within application tolerance
Reverse Recovery Time (trr): Standard recovery (>500 ns) or faster recovery acceptable
Current - Reverse Leakage @ Vr: Substitute parts may exhibit different leakage characteristics
Operating Temperature - Junction: Substitute parts with lower maximum temperature (-55°C to 150°C) are acceptable if application does not require 175°C operation
Product Status: Active substitute parts are preferred over discontinued status

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (DO-214AC SMA Package): Parts matching all mandatory criteria with standard or improved recovery characteristics and compatible temperature ranges.

Category B - Package Variants (SMB Alternative): Parts with identical electrical specifications but different surface mount package (DO-214AA SMB) for applications where package footprint flexibility exists.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	Status
S1MHR3G	Taiwan Semiconductor	1000	1	1.1 @ 1 A	1.5 µs	1 @ 1000 V	175	DO-214AC (SMA)	Discontinued
CGRA4007-G	Comchip Technology	1000	1	1.1 @ 1 A	>500 ns	5 @ 1000 V	150	DO-214AC (SMA)	Active
CURA107-G	Comchip Technology	1000	1	1.7 @ 1 A	75 ns	5 @ 1000 V	150	DO-214AC (SMA)	Active
GS1M-LTP	Micro Commercial Co	1000	1	1.0 @ 1 A	>500 ns	10 @ 1000 V	150	DO-214AC (SMA)	Active
GS2M-LTP	Micro Commercial Co	1000	2	1.1 @ 2 A	>500 ns	5 @ 1000 V	150	DO-214AC (SMA)	Active
RS1M-13-F	Diodes Incorporated	1000	1	1.3 @ 1 A	500 ns	5 @ 1000 V	150	DO-214AC (SMA)	Active
RS1MB-13-F	Diodes Incorporated	1000	1	1.3 @ 1 A	500 ns	5 @ 1000 V	150	DO-214AA (SMB)	Active
S1M-13-F	Diodes Incorporated	1000	1	1.1 @ 1 A	3 µs	5 @ 1000 V	150	DO-214AC (SMA)	Active
S1MB-13-F	Diodes Incorporated	1000	1	1.1 @ 1 A	3 µs	5 @ 1000 V	150	DO-214AA (SMB)	Active
US1M-13-F	Diodes Incorporated	1000	1	1.7 @ 1 A	75 ns	5 @ 1000 V	150	DO-214AC (SMA)	Active
US1M-TP	Micro Commercial Co	1000	1	1.4 @ 2 A	100 ns	10 @ 1000 V	175	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Substitute - Identical Thermal Range:

US1M-TP (Micro Commercial Co) is the preferred substitute when the application requires the full -55°C to 175°C junction temperature range of the original S1MHR3G. This part maintains the upper temperature limit of 175°C while providing fast recovery characteristics (100 ns) and active product status. The DO-214AC (SMA) package ensures direct footprint compatibility.

Primary Substitute - Standard Temperature Applications:

S1M-13-F (Diodes Incorporated) provides direct electrical equivalence with matching forward voltage (1.1 V @ 1 A) and standard recovery characteristics (3 µs). This part is suitable for applications operating within -55°C to 150°C. High inventory availability (190,400 pcs) and active status support procurement continuity.

Alternative - Improved Recovery Performance:

US1M-13-F (Diodes Incorporated) or CURA107-G (Comchip Technology) offer ultrafast recovery characteristics (75 ns) for applications requiring reduced switching losses. Both parts maintain 1000 V / 1 A ratings and DO-214AC (SMA) packaging. Operating temperature is limited to 150°C maximum.

Alternative - Lower Forward Voltage:

GS1M-LTP (Micro Commercial Co) exhibits the lowest forward voltage specification (1.0 V @ 1 A) among available substitutes, reducing power dissipation in rectification circuits. Standard recovery characteristics and DO-214AC (SMA) packaging are maintained.

Higher Current Capability:

GS2M-LTP (Micro Commercial Co) provides 2 A average rectified current in the same DO-214AC (SMA) package for applications requiring increased current capacity at 1000 V rating.

Package Variant - SMB Alternative:

RS1MB-13-F or S1MB-13-F (Diodes Incorporated) provide identical electrical specifications to their SMA counterparts (RS1M-13-F and S1M-13-F) in DO-214AA (SMB) package format. These are suitable only when PCB layout accommodates the larger SMB footprint.

All recommended substitutes comply with RoHS3 and REACH requirements. Substitutes with reduced maximum junction temperature (150°C vs. 175°C) are acceptable only when application thermal design does not exceed 150°C.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower maximum junction temperature (150°C vs. 175°C)?

A: Yes, provided the application design ensures the diode junction temperature does not exceed 150°C during operation. Thermal analysis of the specific circuit application determines compatibility. If the original design requires 175°C capability, only US1M-TP maintains this specification.

Q: What is the difference between standard recovery and fast recovery diodes in this product category?

A: Standard recovery diodes (trr >500 ns) exhibit slower reverse recovery, suitable for general rectification at lower switching frequencies. Fast recovery diodes (trr ≤500 ns) reduce reverse recovery time, minimizing switching losses and enabling operation at higher frequencies. Selection depends on circuit switching frequency requirements.

Q: Are SMB package variants (RS1MB-13-F, S1MB-13-F) direct replacements for the DO-214AC (SMA) package?

A: No. SMB and SMA packages have different physical footprints and PCB land patterns. SMB variants are larger and require different PCB layout. Use SMB variants only when the PCB design explicitly accommodates the larger package or when a redesign is acceptable.

Q: Which substitute offers the best inventory availability?

A: US1M-13-F (Diodes Incorporated) has the highest inventory at 935,300 pcs. S1M-13-F (Diodes Incorporated) and RS1M-13-F (Diodes Incorporated) also maintain substantial inventory levels (190,400 and 189,953 pcs respectively).

Q: Can I use GS2M-LTP (2 A rated) as a substitute for the 1 A S1MHR3G?

A: Yes. A higher current-rated diode is electrically compatible in a 1 A application. The 2 A diode will operate safely at 1 A with lower power dissipation and improved thermal margin. This substitution is valid when the DO-214AC (SMA) package footprint is acceptable.

Q: What is the significance of the reverse leakage current difference between the S1MHR3G (1 µA) and substitute parts (5-10 µA)?

A: Reverse leakage current affects standoff voltage performance and power dissipation in reverse bias conditions. Higher leakage (5-10 µA vs. 1 µA) results in slightly increased power loss when the diode is reverse-biased. For most general rectification applications, this difference is negligible. Critical applications requiring minimal leakage should specify the lowest available leakage rating.

Q: Are all substitute parts RoHS3 and REACH compliant?

A: Yes. All substitute parts listed comply with RoHS3 and REACH requirements, matching the compliance status of the original S1MHR3G.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in two package formats: DO-214AC (SMA) for direct footprint replacement, and DO-214AA (SMB) for applications with larger package tolerance. Tape & Reel (TR) and Cut Tape (CT) packaging options are available depending on the specific part number and supplier.

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