SS115 R3G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS115 R3G is a 150V, 1A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AC (SMA) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute parts from alternative manufacturers. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), making it suitable for industrial and commercial applications requiring fast recovery Schottky diode functionality.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	150	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	950 mV @ 1 A	mV
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100 µA @ 150 V	µA
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55°C to 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS115 R3G is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria (Must Match):

Voltage - DC Reverse (Vr) Maximum: 150V
Current - Average Rectified (Io): 1A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) Maximum @ If: Must not exceed application requirements
Current - Reverse Leakage @ Vr: Lower values indicate improved performance
Operating Temperature - Junction: Must accommodate application thermal range
RoHS Status: ROHS3 Compliant

Parts meeting all primary criteria are classified as direct equivalents. Parts with identical electrical ratings but different current ratings (2A, 3A, 5A) are classified as higher-current alternatives suitable for applications with increased current headroom. All substitute parts listed maintain ROHS3 compliance and unlimited MSL rating.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (mV)	Reverse Leakage @ Vr (µA)	Operating Temp Junction (°C)	Product Status	Package
SS115 R3G	Taiwan Semiconductor Corporation	150	1	950 @ 1A	100 @ 150V	-55 to 150	Discontinued	DO-214AC, SMA
CDBA1150-HF	Comchip Technology	150	1	870 @ 1A	500 @ 150V	-50 to 175	Active	DO-214AC, SMA
CDBA1200-HF	Comchip Technology	150	1	900 @ 1A	500 @ 200V	-50 to 175	Active	DO-214AC, SMA
SS1150-LTP	Micro Commercial Co	150	1	900 @ 1A	50 @ 150V	-50 to 150	Active	DO-214AC, SMA
STPS1150A	STMicroelectronics	150	1	820 @ 1A	1 @ 150V	Max 175	Active	DO-214AC, SMA
STPS1150AY	STMicroelectronics	150	1	820 @ 1A	1 @ 150V	Max 175	Active	DO-214AC, SMA
CDBA2150-HF	Comchip Technology	150	2	870 @ 2A	500 @ 150V	-55 to 150	Active	DO-214AC, SMA
SS2150-LTP	Micro Commercial Co	150	2	900 @ 2A	500 @ 150V	-55 to 125	Active	DO-214AC, SMA
STPS2150A	STMicroelectronics	150	2	820 @ 2A	1.5 @ 150V	Max 175	Active	DO-214AC, SMA
CDBA3150-HF	Comchip Technology	150	3	870 @ 2A	500 @ 150V	-50 to 175	Active	DO-214AC, SMA
CDBA5150-HF	Comchip Technology	150	5	870 @ 5A	500 @ 150V	-50 to 175	Active	DO-214AC, SMA

Engineering Selection Recommendations

Direct Equivalents (1A, 150V Rating):

The following parts are direct functional equivalents meeting all primary substitution criteria:

CDBA1150-HF (Comchip Technology): Active product with improved forward voltage (870 mV vs. 950 mV) and extended operating temperature range (-50°C to 175°C). ROHS3 compliant.
CDBA1200-HF (Comchip Technology): Active product with forward voltage of 900 mV and extended operating temperature range. ROHS3 compliant.
SS1150-LTP (Micro Commercial Co): Active product with forward voltage of 900 mV and superior reverse leakage characteristics (50 µA vs. 100 µA). ROHS3 compliant. Maintains same manufacturer family as original part.
STPS1150A (STMicroelectronics): Active product with lowest forward voltage (820 mV) and minimal reverse leakage (1 µA). Extended maximum junction temperature of 175°C. ROHS3 compliant.
STPS1150AY (STMicroelectronics): Automotive-grade variant of STPS1150A with identical electrical specifications. Series Q designation. ROHS3 compliant.

Higher-Current Alternatives (2A, 3A, 5A Ratings):

These parts maintain 150V reverse voltage rating and DO-214AC package but accommodate increased current requirements:

CDBA2150-HF (Comchip Technology): 2A rated, active product, extended temperature range.
SS2150-LTP (Micro Commercial Co): 2A rated, active product, same manufacturer family as original.
STPS2150A (STMicroelectronics): 2A rated, active product, lowest forward voltage (820 mV), minimal reverse leakage.
CDBA3150-HF (Comchip Technology): 3A rated, active product, extended temperature range.
CDBA5150-HF (Comchip Technology): 5A rated, active product, extended temperature range, highest inventory availability (63,920 units).

All recommended substitutes maintain ROHS3 compliance, unlimited MSL rating, and fast recovery Schottky technology specifications.

Frequently Asked Questions (FAQ)

Q: Can STPS1150A directly replace SS115 R3G in all applications?

A: STPS1150A meets all primary electrical and mechanical substitution criteria: 150V reverse voltage, 1A average rectified current, DO-214AC SMA package, and fast recovery Schottky technology. The lower forward voltage (820 mV vs. 950 mV) and minimal reverse leakage (1 µA vs. 100 µA) represent improved performance characteristics. Verify application thermal requirements against the 175°C maximum junction temperature specification.

Q: What is the difference between STPS1150A and STPS1150AY?

A: Both parts share identical electrical specifications: 150V reverse voltage, 1A current rating, 820 mV forward voltage, and 1 µA reverse leakage. STPS1150AY carries automotive-grade qualification (Series Q designation) and is suitable for automotive applications requiring AEC-Q101 compliance. STPS1150A is the standard industrial variant. Both are active products with ROHS3 compliance.

Q: Why would I select a 2A or 5A rated diode instead of the 1A equivalent?

A: Higher-current rated diodes (CDBA2150-HF, STPS2150A, CDBA5150-HF) provide design margin for applications with variable or peak current conditions exceeding 1A. These parts maintain identical 150V reverse voltage and DO-214AC package compatibility. Selection depends on application current requirements and thermal management considerations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original SS115 R3G also maintains ROHS3 compliance. All parts are REACH unaffected and classified under ECCN EAR99.

Q: What is the significance of forward voltage differences between substitutes?

A: Forward voltage (Vf) directly affects power dissipation and thermal performance. Lower forward voltage reduces heat generation. STPS1150A and STPS2150A exhibit the lowest forward voltage (820 mV), while CDBA1150-HF and CDBA1200-HF offer intermediate values (870-900 mV). The original SS115 R3G specifies 950 mV. Selection should account for application power budget and thermal constraints.

Q: Can I use SS1150-LTP as a direct replacement for SS115 R3G?

A: Yes. SS1150-LTP is a direct equivalent from Micro Commercial Co with identical 150V, 1A ratings and DO-214AC SMA package. It maintains the same manufacturer family designation (SS series). The part is active with extended operating temperature range (-50°C to 150°C) and superior reverse leakage characteristics (50 µA vs. 100 µA). ROHS3 compliant.

Q: What packaging options are available for these substitutes?

A: All listed substitute parts use DO-214AC (SMA) surface mount package, matching the original SS115 R3G package specification. Packaging formats vary between manufacturers: Comchip Technology supplies CDBA series in Tape & Reel (TR); Micro Commercial Co supplies SS series in Tape & Reel (TR); STMicroelectronics supplies STPS series in Cut Tape (CT) & Digi-Reel®. All are compatible with standard surface mount assembly processes.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current (Ir) represents unwanted current flow at maximum reverse voltage. Lower values indicate superior diode quality and reduced power loss. STPS1150A and STPS2150A exhibit minimal leakage (1-1.5 µA), while Comchip CDBA series shows 500 µA. SS1150-LTP provides intermediate performance (50 µA). Selection depends on application sensitivity to leakage current and power efficiency requirements.

Q: Is the SS115 R3G still available for purchase?

A: SS115 R3G is classified as discontinued at DiGi Electronics. However, 859 units remain in stock as new original inventory. For new designs or long-term supply assurance, selection of active substitute parts is recommended. CDBA1150-HF, SS1150-LTP, and STPS1150A are all active products with substantial inventory availability.

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