USB50815C-A/TR7 Equivalent & Substitute Parts

Part Overview

The USB50815C-A/TR7 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for Ethernet applications. This surface-mount component operates with a 15V reverse standoff voltage and 32V maximum clamping voltage, providing 5A peak pulse current protection in an 8-SOIC package. The device is Active status and RoHS3 compliant.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter ranges.

Key Parameters

Parameter	USB50815C-A/TR7
Manufacturer	Microchip Technology
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	2
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	16.7V
Voltage - Clamping (Max) @ Ipp	32V
Current - Peak Pulse (8/20µs)	5A
Power - Peak Pulse	500W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Packaging Format	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the USB50815C-A/TR7 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Reverse Standoff Voltage: 15V (matching specification)
Breakdown Voltage (Min): 16.7V (matching specification)
Peak Pulse Current: 5A (8/20µs) minimum
Package Type: 8-SOIC surface mount
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum

Acceptable Variation Parameters:

Clamping Voltage (Max) @ Ipp: 30V to 32V range
Peak Pulse Power: 300W to 500W
Bidirectional Channels: 2 to 4 channels
Capacitance @ 1MHz: 3pF to 80pF

Substitute parts are grouped based on matching the 15V reverse standoff voltage specification while maintaining compatible electrical performance within the 8-SOIC package format.

Parameter Comparison

Parameter	USB50815C-A/TR7	SMDA15CE3/TR7	SMDA24C/TR7	SMDB12C/TR7	SMDB24C/TR7	CDNBS08-T15C	SMDA15C.TBT
Manufacturer	Microchip	Microchip	Microchip	Microchip	Microchip	Bourns Inc.	Semtech
Voltage - Reverse Standoff (Typ)	15V	15V	24V	12V	24V	15V	15V
Voltage - Breakdown (Min)	16.7V	16.7V	26.7V	13.3V	26.7V	16.7V	16.7V
Voltage - Clamping (Max) @ Ipp	32V	24V	43V	19V	43V	30V (Typ)	30V
Current - Peak Pulse (8/20µs)	5A	5A	5A	5A	5A	17A	10A
Power - Peak Pulse	500W	300W	300W	300W	300W	500W	300W
Bidirectional Channels	2	4	4	4	4	4	4
Capacitance @ 1MHz	3pF	70pF	45pF	95pF	45pF	80pF	75pF
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 125°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Equivalent (Matching Standoff Voltage):

SMDA15CE3/TR7 and SMDA15C.TBT are direct electrical equivalents with 15V reverse standoff voltage matching the USB50815C-A/TR7. Both maintain the same breakdown voltage specification (16.7V minimum) and operate within the required temperature range. SMDA15CE3/TR7 is RoHS3 compliant and available in Tape & Reel format. SMDA15C.TBT is also RoHS3 compliant but operates to 125°C maximum junction temperature, which is within acceptable limits for most applications.

CDNBS08-T15C (Bourns Inc.) provides equivalent 15V standoff voltage with superior peak pulse current capability (17A versus 5A) and maintains RoHS3 compliance. This part is suitable for applications requiring higher transient current handling.

Alternative Voltage Classes:

SMDB12C/TR7 operates at 12V reverse standoff voltage and is suitable only for applications with lower voltage protection requirements. SMDA24C/TR7 and SMDB24C/TR7 operate at 24V reverse standoff voltage and are not direct substitutes for 15V applications.

Compliance Considerations:

All recommended primary substitutes (SMDA15CE3/TR7, SMDA15C.TBT, and CDNBS08-T15C) maintain RoHS3 compliance and Active product status. SMDA24C/TR7 and SMDB24C/TR7 are RoHS non-compliant and should not be selected for applications requiring RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can SMDA15CE3/TR7 directly replace USB50815C-A/TR7?

A: SMDA15CE3/TR7 is electrically compatible with matching 15V reverse standoff voltage and 16.7V minimum breakdown voltage. The clamping voltage is lower (24V versus 32V), which is acceptable for Ethernet protection applications. Both are RoHS3 compliant and operate across the required temperature range. The primary difference is channel count (4 versus 2), which does not affect single-channel protection performance.

Q: What is the difference between SMDA15C.TBT and SMDA15CE3/TR7?

A: Both parts share 15V reverse standoff voltage and 16.7V breakdown voltage specifications. SMDA15C.TBT is manufactured by Semtech Corporation with 10A peak pulse current and 30V clamping voltage. SMDA15CE3/TR7 is manufactured by Microchip Technology with 5A peak pulse current and 24V clamping voltage. SMDA15C.TBT operates to 125°C maximum junction temperature, while SMDA15CE3/TR7 operates to 150°C. Both are RoHS3 compliant.

Q: Why is CDNBS08-T15C listed as a substitute despite higher peak pulse current?

A: CDNBS08-T15C maintains the critical 15V reverse standoff voltage and 16.7V breakdown voltage specifications required for direct substitution. The 17A peak pulse current (versus 5A) represents enhanced capability rather than incompatibility. The 30V typical clamping voltage falls within acceptable range for Ethernet protection. This part is suitable for applications where higher transient current handling is beneficial.

Q: Can SMDA24C/TR7 be used in place of USB50815C-A/TR7?

A: No. SMDA24C/TR7 operates at 24V reverse standoff voltage, which is incompatible with the 15V specification of USB50815C-A/TR7. Additionally, SMDA24C/TR7 is RoHS non-compliant, which may violate design requirements. This part is not a suitable substitute.

Q: Are all substitute parts available in Tape & Reel packaging?

A: SMDB24C/TR7 is available in Cut Tape (CT) format rather than Tape & Reel (TR). All other substitute parts are available in Tape & Reel format matching the original USB50815C-A/TR7 packaging specification.

Q: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC package (0.154", 3.90mm width) is a standard surface-mount form factor. All listed substitute parts use identical 8-SOIC packaging, ensuring mechanical and electrical compatibility with printed circuit board layouts designed for USB50815C-A/TR7.

Q: How does capacitance variation affect substitution suitability?

A: Capacitance values range from 3pF to 95pF across substitute parts. For Ethernet protection applications, this variation is acceptable as it does not significantly impact transient suppression performance. Lower capacitance (3pF to 30pF) is preferred for high-speed signal integrity, while higher capacitance (70pF to 95pF) provides additional energy absorption capability.

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