SMAJ18CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ18CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with an 18V reverse standoff voltage and provides clamping at 32.2V maximum, with a peak pulse current rating of 15.5A. The component is packaged in DO-214AC (SMA) format and is currently in active production status with full RoHS3 compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the critical voltage and current parameters while preserving the same package format and operating temperature range requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	18	V
Voltage - Breakdown (Min)	20	V
Voltage - Clamping (Max) @ Ipp	32.2	V
Current - Peak Pulse (10/1000µs)	15.5	A
Power - Peak Pulse	500	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ18CE3/TR13 are qualified based on the following criteria:

Mandatory Matching Parameters:

Voltage - Reverse Standoff (Typ): 18V
Voltage - Breakdown (Min): 20V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Substitutes may vary within the range of 29.2V to 39.3V
Current - Peak Pulse (10/1000µs): Substitutes may range from 13.7A to 102A
Power - Peak Pulse: Substitutes may range from 400W to 600W
Operating Temperature Range: Substitutes must support the minimum range of -55°C to 150°C

All substitute parts maintain active product status and full regulatory compliance with RoHS3 and REACH requirements.

Parameter Comparison

Parameter	SMAJ18CE3/TR13 (Microchip)	SMA6J18CA-TR (STMicroelectronics)	SMAJ18CA (MDD)	SMAJ18CA-13-F (Diodes Inc.)	SMAJ18CA-TR (STMicroelectronics)
Manufacturer	Microchip Technology	STMicroelectronics	MDD	Diodes Incorporated	STMicroelectronics
Voltage - Reverse Standoff (Typ)	18V	18V	18V	18V	18V
Voltage - Breakdown (Min)	20V	20V	20V	20V	20V
Voltage - Clamping (Max) @ Ipp	32.2V	33.2V	29.2V	29.2V	39.3V
Current - Peak Pulse (10/1000µs)	15.5A	102A (8/20µs)	13.7A	13.7A	59A (8/20µs)
Power - Peak Pulse	500W	600W	400W	400W	400W
Operating Temperature Range	-65 to 150°C	-55 to 175°C	-50 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1	1
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

All identified substitute parts maintain full compatibility with the SMAJ18CE3/TR13 across mandatory electrical and mechanical parameters. Selection among substitutes is determined by application-specific requirements and availability constraints.

SMA6J18CA-TR (STMicroelectronics): This substitute provides the highest peak pulse current rating at 102A and extended upper operating temperature to 175°C. The clamping voltage of 33.2V remains within acceptable tolerance of the original specification. This option is suitable for applications requiring enhanced thermal performance or higher transient current handling.

SMAJ18CA (MDD): This substitute offers the lowest clamping voltage at 29.2V with a peak pulse current of 13.7A. Operating temperature range extends to -50°C minimum. This option is suitable for cost-sensitive applications where the lower clamping voltage and reduced current rating remain within system requirements.

SMAJ18CA-13-F (Diodes Incorporated): This substitute provides identical electrical performance to the MDD variant with a clamping voltage of 29.2V and peak pulse current of 13.7A. Operating temperature range is -55°C to 150°C. Packaging is specified as Tape & Reel (TR), matching the original part format.

SMAJ18CA-TR (STMicroelectronics): This substitute features the highest clamping voltage at 39.3V with a peak pulse current of 59A. Operating temperature range is -55°C to 150°C. This option is suitable for applications requiring maximum voltage clamping performance and moderate transient current handling.

All substitute parts carry active product status, full RoHS3 compliance, and REACH unaffected designation, ensuring regulatory and environmental compliance equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: What determines whether a part can substitute for the SMAJ18CE3/TR13?

A: Substitute parts must maintain identical voltage ratings (18V reverse standoff, 20V minimum breakdown), operate in the same DO-214AC (SMA) package format, and support surface-mount installation. All substitutes must be RoHS3 compliant with MSL rating of 1 (Unlimited). Variations in clamping voltage, peak pulse current, and power dissipation are allowable within the specified ranges.

Q: Can I use a substitute with a different clamping voltage?

A: Yes. The SMAJ18CE3/TR13 specifies a maximum clamping voltage of 32.2V. Substitutes with clamping voltages between 29.2V and 39.3V are qualified. Lower clamping voltages provide tighter voltage regulation; higher clamping voltages offer reduced clamping stress. Selection depends on the specific overvoltage protection threshold required by your circuit.

Q: Are all substitutes available in Tape & Reel packaging?

A: The SMAJ18CE3/TR13 is supplied in Tape & Reel (TR) format. Among the qualified substitutes, SMA6J18CA-TR, SMAJ18CA-13-F, and SMAJ18CA-TR are explicitly specified with Tape & Reel or equivalent packaging. The SMAJ18CA (MDD) variant does not specify packaging format in the provided data.

Q: What is the difference between the STMicroelectronics SMA6J18CA-TR and SMAJ18CA-TR variants?

A: Both are STMicroelectronics products with identical 18V reverse standoff voltage. The SMA6J18CA-TR (SMA6J series) provides 102A peak pulse current with 33.2V clamping. The SMAJ18CA-TR (SMAJ series) provides 59A peak pulse current with 39.3V clamping. Selection depends on whether your application requires higher current handling (SMA6J variant) or higher voltage clamping (SMAJ variant).

Q: Do all substitutes support the same operating temperature range as the original part?

A: The SMAJ18CE3/TR13 operates from -65°C to 150°C. Most substitutes support -55°C to 150°C or -55°C to 175°C minimum ranges. The MDD SMAJ18CA variant operates from -50°C to 150°C. Verify that the substitute's operating temperature range encompasses your application's thermal requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All identified substitute parts carry RoHS3 compliance certification and REACH unaffected status, matching the regulatory compliance of the original SMAJ18CE3/TR13 component.

Q: What is the inventory status of these substitutes?

A: Inventory levels vary by manufacturer and distributor. SMA6J18CA-TR (STMicroelectronics) has 10,300 units available. SMAJ18CA (MDD) has 72,210 units available. SMAJ18CA-13-F (Diodes Incorporated) has 26,075 units available. SMAJ18CA-TR (STMicroelectronics) has 19,515 units available. Verify current availability with your component supplier.

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