SMAJ33CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ33CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for surface mount applications in the DO-214AC (SMA) package. This bidirectional zener diode provides transient voltage protection with a 33V reverse standoff voltage and 59V maximum clamping voltage at peak pulse current. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified based on matching or compatible electrical characteristics within the TVS diode category, specifically those sharing the same reverse standoff voltage (33V), bidirectional channel configuration, surface mount packaging, and general-purpose application profile.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	36.7	V
Voltage - Clamping (Max) @ Ipp	59	V
Current - Peak Pulse (10/1000µs)	8.5	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	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ33CE3/TR13 are grouped based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 33V
Voltage - Breakdown (Min): 36.7V
Bidirectional Channels: 1
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Voltage - Clamping (Max) @ Ipp: Range 53.3V to 69.7V
Current - Peak Pulse: Range 7.5A to 33A
Power - Peak Pulse: Range 400W to 600W
Operating Temperature Range: -65°C to -55°C minimum; 150°C to 175°C maximum
MSL Rating: 1 (Unlimited)

All substitute parts listed maintain the core 33V standoff voltage specification and DO-214AC surface mount package, ensuring mechanical and electrical compatibility within the TVS diode application space. Variations in clamping voltage, peak pulse current, and power dissipation reflect different performance grades suitable for varying transient protection requirements.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current	Power Peak Pulse (W)	Temp Range (°C)	Package
SMAJ33CE3/TR13	Microchip Technology	33	36.7	59	8.5A (10/1000µs)	500	-65 to 150	DO-214AC, SMA
SM4T39CAY	STMicroelectronics	33	36.7	69.7	33A (8/20µs)	400	-55 to 150	DO-214AC, SMA
SMA6J33CA-TR	STMicroelectronics	33	36.7	60.8	57A (8/20µs)	600	-55 to 175	DO-214AC, SMA
SMAJ33CA	Good-Ark Semiconductor	33	36.7	53.3	7.5A (10/1000µs)	400	-55 to 150	DO-214AC, SMA
SMAJ33CA-13-F	Diodes Incorporated	33	36.7	53.3	7.5A (10/1000µs)	400	-55 to 150	DO-214AC, SMA
SMAJ33CA-TP	Micro Commercial Co	33	36.7	53.3	7.5A (10/1000µs)	400	-55 to 175	DO-214AC, SMA
SMAJ33CA-TR	STMicroelectronics	33	36.7	69.7	33A (8/20µs)	400	-55 to 150	DO-214AC, SMA
SZ1SMA33CAT3G	onsemi	33	36.7	53.3	7.5A (10/1000µs)	400	-65 to 150	DO-214AC, SMA

Engineering Selection Recommendations

Direct Equivalents (Closest Match):

SMAJ33CA (Good-Ark Semiconductor), SMAJ33CA-13-F (Diodes Incorporated), and SZ1SMA33CAT3G (onsemi) provide the closest electrical equivalence to the SMAJ33CE3/TR13. These parts share identical reverse standoff voltage (33V), breakdown voltage (36.7V), clamping voltage (53.3V), and peak pulse current (7.5A) specifications. All three maintain RoHS3 compliance and MSL 1 rating. The SZ1SMA33CAT3G variant includes AEC-Q101 automotive qualification and extends the operating temperature range to -65°C minimum, matching the original part's lower temperature limit.

Higher Performance Alternatives:

SMAJ33CA-TP (Micro Commercial Co) matches the electrical performance of the direct equivalents while extending the maximum operating temperature to 175°C. SMAJ33CA-TR (STMicroelectronics) and SM4T39CAY (STMicroelectronics) offer increased peak pulse current handling (33A) and higher clamping voltage (69.7V), suitable for applications requiring enhanced transient suppression capability. SMA6J33CA-TR (STMicroelectronics) provides the highest power dissipation rating (600W) with 57A peak pulse current capacity and 175°C maximum operating temperature.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. SM4T39CAY and SZ1SMA33CAT3G include AEC-Q101 automotive qualification, applicable for automotive-grade applications. Selection should account for specific application temperature requirements and transient energy levels.

Frequently Asked Questions (FAQ)

Q: Can SMAJ33CA be used as a direct replacement for SMAJ33CE3/TR13?

A: Yes. SMAJ33CA shares the same 33V reverse standoff voltage, 36.7V breakdown voltage, DO-214AC surface mount package, and zener type configuration. Both devices are RoHS3 compliant with MSL 1 rating. The clamping voltage (53.3V) and peak pulse current (7.5A) are compatible with the original part's 59V clamping and 8.5A specification range.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms used to characterize TVS diode performance. The 10/1000µs waveform (used by Microchip, Good-Ark, Diodes, Micro Commercial, and onsemi) defines a 10µs rise time and 1000µs decay time. The 8/20µs waveform (used by STMicroelectronics) defines an 8µs rise time and 20µs decay time. Both are standard test conditions; selection depends on application-specific transient characteristics.

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

A: All substitute parts use DO-214AC (SMA) surface mount package, ensuring mechanical compatibility. Packaging format variations (Tape & Reel, Cut Tape, Digi-Reel) affect supply and handling but do not impact electrical performance or board-level compatibility.

Q: Which substitute part offers the widest operating temperature range?

A: SMA6J33CA-TR (STMicroelectronics) and SMAJ33CA-TP (Micro Commercial Co) both extend to 175°C maximum operating temperature, compared to the original part's 150°C limit. SZ1SMA33CAT3G (onsemi) matches the original part's -65°C minimum temperature, providing the widest range when combined with 150°C maximum.

Q: Can I use SM4T39CAY or SMA6J33CA-TR for higher transient energy applications?

A: Yes. SM4T39CAY provides 33A peak pulse current and 69.7V clamping voltage. SMA6J33CA-TR provides 57A peak pulse current, 60.8V clamping voltage, and 600W peak power dissipation. Both are suitable for applications requiring enhanced transient suppression beyond the original part's 8.5A and 500W specifications, while maintaining the 33V standoff voltage requirement.

Q: Are automotive-qualified alternatives available?

A: Yes. SM4T39CAY and SZ1SMA33CAT3G both carry AEC-Q101 automotive qualification. These parts are suitable for automotive-grade applications requiring transient voltage suppression with verified reliability standards.

Q: What is the significance of MSL 1 rating?

A: MSL 1 (Moisture Sensitivity Level 1) indicates Unlimited shelf life without moisture control requirements. All listed parts maintain this rating, ensuring no special storage or handling conditions are necessary prior to assembly.

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