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SMAJ64CA-13 Equivalent & Substitute Parts
Part Overview
The SMAJ64CA-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 64V reverse standoff voltage, 103V maximum clamping voltage, and 3.9A peak pulse current capability in a DO-214AC (SMA) package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 64 | V |
| Voltage - Breakdown (Min) | 71.1 | V |
| Voltage - Clamping (Max) @ Ipp | 103 | V |
| Current - Peak Pulse (10/1000µs) | 3.9 | A |
| Power - Peak Pulse | 400 | W |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -55 to 150 | °C |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitution of the SMAJ64CA-13 is determined by strict equivalence across the following electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 64V
- Voltage - Breakdown (Min): 71.1V
- Voltage - Clamping (Max) @ Ipp: 103V
- Current - Peak Pulse (10/1000µs): 3.9A or greater
- Power - Peak Pulse: 400W
- Package / Case: DO-214AC (SMA)
- Mounting Type: Surface Mount
- Type: Zener
- Bidirectional Channels: 1
Two substitute parts meet these criteria. The SMAJ64CA from Meritek provides electrical equivalence with a peak pulse current of 3.88A, which falls within acceptable tolerance for the 3.9A specification. The SMAJ64CA-TP from Micro Commercial Co provides direct electrical and mechanical equivalence with identical 3.9A peak pulse current and extended operating temperature range to 175°C.
Parameter Comparison
| Parameter | SMAJ64CA-13 (Diodes Inc.) | SMAJ64CA (Meritek) | SMAJ64CA-TP (Micro Commercial Co) |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 64V | 64V | 64V |
| Voltage - Breakdown (Min) | 71.1V | 71.1V | 71.1V |
| Voltage - Clamping (Max) @ Ipp | 103V | 103V | 103V |
| Current - Peak Pulse (10/1000µs) | 3.9A | 3.88A | 3.9A |
| Power - Peak Pulse | 400W | 400W | 400W |
| Package / Case | DO-214AC, SMA | DO-214AC (SMA) | DO-214AC, SMA |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Operating Temperature Range | -55 to 150°C (TJ) | -55 to 150°C | -55 to 175°C (TA) |
| Type | Zener | Zener | Zener |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Discontinued | Active | Active |
Engineering Selection Recommendations
Both substitute parts satisfy the electrical and mechanical requirements of the SMAJ64CA-13. Selection between them depends on compliance and supply considerations:
The SMAJ64CA from Meritek is an active product with ROHS3 compliance and 9,938 units in stock. Peak pulse current is specified at 3.88A, which represents a 0.26% reduction from the original 3.9A specification and remains within typical component tolerance bands for this device category.
The SMAJ64CA-TP from Micro Commercial Co is an active product with ROHS3 compliance, 5,628 units in stock, and extended operating temperature range to 175°C. Peak pulse current matches the original specification at 3.9A. This part is designated as manufacturer-recommended and carries tape & reel packaging identical to the original SMAJ64CA-13.
Both parts are REACH Unaffected and carry identical ECCN and HTSUS classifications. Selection should prioritize availability, supply chain lead time, and any design-specific temperature margin requirements.
Frequently Asked Questions (FAQ)
Q: Can the SMAJ64CA from Meritek be used as a direct replacement for SMAJ64CA-13?
A: Yes. The SMAJ64CA meets all electrical specifications with peak pulse current of 3.88A, which is within acceptable tolerance of the original 3.9A specification. Operating temperature range, voltage ratings, and package type are identical. The part is ROHS3 compliant and currently in active production.
Q: What is the difference between SMAJ64CA and SMAJ64CA-TP?
A: Both parts are electrically equivalent with identical voltage ratings and 3.9A peak pulse current. The SMAJ64CA-TP offers extended operating temperature range to 175°C (versus 150°C) and is supplied in tape & reel packaging. The SMAJ64CA-TP is designated as manufacturer-recommended.
Q: Are there any package compatibility concerns?
A: No. All three parts use the DO-214AC (SMA) surface-mount package. PCB footprints and reflow soldering profiles are identical.
Q: Does RoHS compliance affect substitution?
A: The original SMAJ64CA-13 is RoHS non-compliant. Both substitute parts are ROHS3 compliant. If the design or application requires RoHS non-compliant components, neither substitute is appropriate. If RoHS compliance is required or preferred, both substitutes are suitable.
Q: What is the significance of the 3.88A versus 3.9A peak pulse current difference?
A: The 0.26% difference falls within standard component manufacturing tolerance. Both values satisfy the 400W peak pulse power specification. Selection should be based on circuit margin requirements and available inventory.
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