AOZ8302CI-05 Equivalent & Substitute Parts

Part Overview

The AOZ8302CI-05 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Alpha & Omega Semiconductor Inc., designed for surface mount applications in Ethernet and Telecom protection circuits. This component features a 5V reverse standoff voltage with 14V maximum clamping voltage and 32A peak pulse current capability in an SOT-23-3 package.

The AOZ8302CI-05 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring TVS protection in communication and networking systems.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	5V (Max)	V
Voltage - Breakdown (Min)	6V	V
Voltage - Clamping (Max) @ Ipp	14V	V
Current - Peak Pulse (10/1000µs)	32A (8/20µs)	A
Power - Peak Pulse	432W	W
Capacitance @ Frequency	25pF @ 1MHz	pF
Operating Temperature	-40°C ~ 85°C	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	SOT-23-3	-
Type	Zener	-
Unidirectional Channels	2	-

Substitute Part Grouping Explanation

Substitute parts for the AOZ8302CI-05 are selected based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 5V (Max)
Voltage - Breakdown (Min): 6V
Mounting Type: Surface Mount
Package / Case: SOT-23-3 compatible
Type: Zener diode
Unidirectional Channels: 2

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 14V nominal (acceptable range 13V–24V for circuit protection)
Current - Peak Pulse: 32A minimum (acceptable range 10A–42A depending on application)
Operating Temperature: -40°C ~ 85°C minimum

Parts meeting these criteria are classified as direct substitutes. Variations in clamping voltage, peak pulse current, and capacitance are acceptable within the specified ranges, provided the reverse standoff and breakdown voltages remain within tolerance and the package remains SOT-23-3 compatible.

Parameter Comparison

Parameter	AOZ8302CI-05	AOZ8302ACI-05	CDSOT23-T05C	PESD36VS2UT,215	SM05-02HTG
Manufacturer	Alpha & Omega Semiconductor Inc.	Alpha & Omega Semiconductor Inc.	Bourns Inc.	Nexperia USA Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	5V (Max)	5V (Max)	5V	36V (Max)	5V (Max)
Voltage - Breakdown (Min)	6V	6V	6V	40V	-
Voltage - Clamping (Max) @ Ipp	14V	24V	14.6V	60V	13V
Current - Peak Pulse (10/1000µs)	32A (8/20µs)	32A	42A (8/20µs)	2.5A (8/20µs)	10A (8/20µs)
Power - Peak Pulse	432W	-	500W	160W	400W
Capacitance @ Frequency	25pF @ 1MHz	20pF @ 1MHz	210pF @ 1MHz	17pF @ 1MHz	400pF @ 1MHz
Operating Temperature	-40°C ~ 85°C (TJ)	-40°C ~ 85°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TA)	-40°C ~ 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	2	2	1 (Bidirectional)	2	2
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

AOZ8302ACI-05 (Alpha & Omega Semiconductor Inc.) — Recommended Primary Substitute

This part is the direct successor to the AOZ8302CI-05, sharing identical reverse standoff (5V) and breakdown (6V) voltages. It maintains the same 32A peak pulse current and SOT-23-3 package. The higher clamping voltage (24V vs. 14V) provides enhanced transient protection margin. Product status is Active with full RoHS3 compliance and unlimited moisture sensitivity rating. This is the preferred replacement for direct design continuity.

CDSOT23-T05C (Bourns Inc.) — Alternative Substitute

This part matches the 5V reverse standoff and 6V breakdown specifications with comparable 14.6V clamping voltage. It offers superior peak pulse current (42A vs. 32A) and extended operating temperature range (-55°C ~ 150°C). The bidirectional channel configuration differs from the original unidirectional design; this must be evaluated for circuit compatibility. Product status is Active with full RoHS3 compliance. Suitable for applications requiring higher current handling or extended temperature operation.

SM05-02HTG (Littelfuse Inc.) — Alternative Substitute

This part meets the 5V reverse standoff specification with 13V clamping voltage and SOT-23-3 package compatibility. Peak pulse current is lower (10A vs. 32A), limiting its use to lower-energy transient environments. Extended operating temperature range (-40°C ~ 150°C) and AEC-Q101 automotive qualification are provided. Product status is Active with full RoHS3 compliance. Suitable for applications with reduced transient energy requirements or automotive-grade requirements.

PESD36VS2UT,215 (Nexperia USA Inc.) — Not Recommended for Direct Substitution

This part operates at 36V reverse standoff and 60V clamping voltage, significantly exceeding the 5V/6V specifications of the AOZ8302CI-05. Peak pulse current is substantially lower (2.5A). While it shares SOT-23-3 package compatibility and includes AEC-Q101 automotive qualification, the voltage mismatch makes it unsuitable for direct replacement in 5V protection circuits.

Frequently Asked Questions (FAQ)

Q: Can AOZ8302ACI-05 be used as a direct replacement for AOZ8302CI-05?

A: Yes. AOZ8302ACI-05 is the recommended primary substitute. Both parts share identical reverse standoff (5V) and breakdown (6V) voltages, peak pulse current (32A), and SOT-23-3 package. The higher clamping voltage (24V vs. 14V) provides additional protection margin without affecting circuit compatibility.

Q: What is the difference between unidirectional and bidirectional TVS diodes?

A: Unidirectional TVS diodes (like AOZ8302CI-05 and AOZ8302ACI-05) protect against transients in one direction only, suitable for single-polarity signal lines. Bidirectional TVS diodes (like CDSOT23-T05C) protect against transients in both directions, suitable for differential signal pairs. Circuit topology determines which type is appropriate.

Q: Why does PESD36VS2UT,215 appear in the substitute list if it is not recommended?

A: PESD36VS2UT,215 was included in the original manufacturer substitute list but operates at fundamentally different voltage levels (36V standoff vs. 5V). It is not suitable for direct replacement in circuits designed for 5V protection. Verification with the original design specification is required before considering this part.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts listed are available in SOT-23-3 surface mount packages, ensuring mechanical and thermal compatibility with the original AOZ8302CI-05 footprint.

Q: What is the impact of different capacitance values among substitute parts?

A: Capacitance variation (17pF to 400pF @ 1MHz) affects high-frequency circuit behavior. Lower capacitance (AOZ8302ACI-05 at 20pF, PESD36VS2UT,215 at 17pF) is preferred for high-speed signal lines. Higher capacitance (SM05-02HTG at 400pF, CDSOT23-T05C at 210pF) may introduce signal degradation in high-frequency applications. Circuit simulation or testing is recommended when capacitance differs significantly from the original specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.

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