SR109 R0G Schottky Diode 90V 1A Equivalent & Substitute Parts

Part Overview

The SR109 R0G is a through-hole Schottky rectifier diode rated for 90V reverse voltage and 1A average rectified current in a DO-204AL (DO-41) axial package. This component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design support and procurement. The part operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH regulations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	90	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 90 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SR109 R0G is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 90V minimum
Current - Average Rectified (Io): 1A minimum
Technology: Schottky
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Direct Manufacturer Equivalents (Taiwan Semiconductor Corporation): Parts SR109, SR109 R1G, SR109H, and SR109HR1G share identical electrical specifications with the main part. These variants differ in product status (active vs. discontinued) and automotive qualification levels (AEC-Q101 for H-grade variants). All maintain the same voltage, current, forward voltage, and temperature ratings.

Similar Cross-Manufacturer Substitutes: Parts SB190-T (Diodes Incorporated), SB1H90-E3/54 (Vishay), and SB1H90-E3/73 (Vishay) meet the core electrical requirements of 90V reverse voltage and 1A average rectified current in compatible through-hole packages. These parts exhibit variations in forward voltage drop and reverse leakage current within acceptable operating ranges for the application category.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Tj (Max) [°C]	Package	Product Status	Automotive Grade
SR109 R0G	Taiwan Semiconductor Corporation	90	1	850 @ 1 A	100 @ 90 V	150	DO-204AL (DO-41)	Discontinued	—
SR109	Taiwan Semiconductor Corporation	90	1	850 @ 1 A	100 @ 90 V	150	DO-204AL (DO-41)	Active	—
SR109 R1G	Taiwan Semiconductor Corporation	90	1	850 @ 1 A	100 @ 90 V	150	DO-204AL (DO-41)	Active	—
SR109H	Taiwan Semiconductor Corporation	90	1	850 @ 1 A	100 @ 90 V	150	DO-204AL (DO-41)	Active	AEC-Q101
SR109HR1G	Taiwan Semiconductor Corporation	90	1	850 @ 1 A	100 @ 90 V	150	DO-204AL (DO-41)	Active	AEC-Q101
SB190-T	Diodes Incorporated	90	1	800 @ 1 A	500 @ 90 V	125	DO-41	Active	—
SB1H90-E3/54	Vishay General Semiconductor - Diodes Division	90	1	770 @ 1 A	1 @ 90 V	175	DO-204AL (DO-41)	Active	—
SB1H90-E3/73	Vishay General Semiconductor - Diodes Division	90	1	770 @ 1 A	1 @ 90 V	175	DO-204AL (DO-41)	Active	—

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select SR109, SR109 R1G, SR109H, or SR109HR1G from Taiwan Semiconductor Corporation. All variants maintain identical electrical performance to the discontinued SR109 R0G. The SR109H and SR109HR1G variants include AEC-Q101 automotive qualification and are suitable for applications requiring automotive-grade components. Standard industrial applications may use SR109 or SR109 R1G.

For Cross-Manufacturer Substitution: SB1H90-E3/54 and SB1H90-E3/73 from Vishay offer superior reverse leakage characteristics (1 µA vs. 100 µA) and higher maximum junction temperature (175°C vs. 150°C), with lower forward voltage drop (770 mV vs. 850 mV). These parts are suitable for applications where reduced power dissipation or extended temperature operation is beneficial.

SB190-T from Diodes Incorporated provides a lower forward voltage drop (800 mV) and is available in higher inventory quantities. This part operates at a lower maximum junction temperature (125°C) and exhibits higher reverse leakage (500 µA), making it suitable for standard industrial applications where thermal headroom is adequate.

Compliance Considerations: All listed parts comply with RoHS3 and REACH regulations. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all variants, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can SR109 R0G be directly replaced with SR109? A: Yes. SR109 is the active production equivalent of the discontinued SR109 R0G. Both parts share identical electrical specifications: 90V reverse voltage, 1A average rectified current, 850 mV forward voltage drop at 1A, and -55°C to 150°C operating temperature range. The only difference is product status (active vs. discontinued).

Q: What is the difference between SR109H and SR109HR1G? A: Both parts are electrically identical and include AEC-Q101 automotive qualification. The designation difference reflects manufacturing date codes or internal revision levels. Both are suitable for automotive applications requiring qualified components.

Q: Can I use SB1H90-E3/54 as a substitute for SR109 R0G? A: Yes, with design considerations. SB1H90-E3/54 meets the core electrical requirements (90V, 1A) and is pin-compatible in DO-204AL (DO-41) packages. However, it exhibits lower forward voltage drop (770 mV vs. 850 mV), significantly lower reverse leakage (1 µA vs. 100 µA), and higher maximum junction temperature (175°C vs. 150°C). These differences reduce power dissipation and improve thermal performance, making it suitable for most applications.

Q: What are the key differences between SB190-T and SB1H90-E3/54? A: Both parts meet the 90V, 1A core requirements. SB190-T (Diodes Incorporated) has 800 mV forward voltage drop and 500 µA reverse leakage with 125°C maximum junction temperature. SB1H90-E3/54 (Vishay) has 770 mV forward voltage drop and 1 µA reverse leakage with 175°C maximum junction temperature. SB1H90-E3/54 offers superior leakage performance and thermal capability, while SB190-T provides a middle-ground forward voltage characteristic.

Q: Are all substitute parts available in the same package? A: All listed parts are available in through-hole axial packages compatible with DO-204AL or DO-41 designations. SB190-T is supplied in Cut Tape (CT) packaging, while SB1H90-E3/54 and SB1H90-E3/73 are also supplied in Cut Tape (CT). Taiwan Semiconductor Corporation variants do not specify packaging format in the provided data. Verify packaging format with supplier documentation for procurement requirements.

Q: Which substitute part has the lowest power dissipation? A: SB1H90-E3/54 and SB1H90-E3/73 exhibit the lowest forward voltage drop at 770 mV @ 1A, resulting in the lowest power dissipation (P = Vf × I = 0.77W at 1A). This compares to 850 mV for SR109 R0G (0.85W) and 800 mV for SB190-T (0.80W).

Q: Do any substitute parts require special handling or storage conditions? A: No. All listed parts have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no special moisture control requirements during storage, handling, or assembly processes.

Q: Can I use automotive-grade SR109H in non-automotive applications? A: Yes. Automotive-grade components (AEC-Q101 qualified) meet or exceed standard industrial specifications. SR109H and SR109HR1G can be used in any application where standard SR109 or SR109 R1G would be suitable, with the added assurance of automotive qualification testing.

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