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1SMB64AT3 Equivalent & Substitute Parts
Part Overview
The 1SMB64AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 64V reverse standoff voltage with a 103V maximum clamping voltage and 5.8A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | 1SMB64AT3 | — |
| Manufacturer | onsemi | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Package / Case | DO-214AA, SMB | — |
| Voltage - Reverse Standoff (Typ) | 64 | V |
| Voltage - Breakdown (Min) | 71.1 | V |
| Voltage - Clamping (Max) @ Ipp | 103 | V |
| Current - Peak Pulse (10/1000µs) | 5.8 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -65 to 150 | °C |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Capacitance @ 1MHz | 280 | pF |
| Product Status | Obsolete | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the 1SMB64AT3 is determined by the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - Reverse Standoff: 64V (nominal)
- Voltage - Clamping (Max) @ Ipp: 103V
- Current - Peak Pulse (10/1000µs): 5.8A (±0.3A tolerance acceptable)
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA (SMB) or equivalent surface mount package
- Type: Zener diode, unidirectional configuration
Direct Equivalents maintain all critical electrical parameters within specification and use identical or functionally equivalent packaging.
Similar Substitutes maintain the core voltage and current ratings but may differ in secondary parameters such as operating temperature range, capacitance characteristics, or package variant (SOD-128 vs. SMB), requiring application-level verification.
Parameter Comparison
| Parameter | 1SMB64AT3 (Main) | SMBJ64A (Meritek) | SMBJ64A-HR (Littelfuse) | PTVS64VP1UP,115 (Nexperia) | SMBJ60CA-TP (MCC) | SMBJ58E3/TR13 (Microchip) |
|---|---|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 64V | 64V | 64V | 64V | 60V | 58V |
| Voltage - Breakdown (Min) | 71.1V | 71.1V | 71.1V | 71.1V | 66.7V | 64.4V |
| Voltage - Clamping (Max) @ Ipp | 103V | 103V | 103V | 103V | 96.8V | 103V |
| Current - Peak Pulse (10/1000µs) | 5.8A | 5.83A | 5.9A | 5.8A | 6.2A | 5.8A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W | 600W | 600W |
| Package / Case | DO-214AA, SMB | DO-214AA (SMB) | DO-214AA, SMB | SOD-128 | DO-214AA, SMB | DO-214AA, SMB |
| Operating Temperature | -65 to 150°C | -55 to 150°C | -65 to 150°C | -55 to 150°C | -55 to 175°C | -65 to 150°C |
| Type | Zener | Zener | Zener | Zener | Zener | Zener |
| Unidirectional Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Recommended for Pin-Compatible Replacement):
SMBJ64A (Meritek) and SMBJ64A-HR (Littelfuse) are direct functional equivalents to the 1SMB64AT3. Both maintain identical voltage ratings (64V standoff, 103V clamping) and current specifications (5.8–5.9A peak pulse). Both are ROHS3 compliant and active products with established supply chains. SMBJ64A-HR offers the extended temperature range (-65 to 150°C) matching the original specification, while SMBJ64A operates within -55 to 150°C. Both use DO-214AA (SMB) packaging for direct PCB compatibility.
Alternative Package Consideration:
PTVS64VP1UP,115 (Nexperia) provides identical electrical performance (64V standoff, 103V clamping, 5.8A peak pulse) but uses SOD-128 packaging instead of SMB. This part is AEC-Q101 qualified and suitable for automotive applications. PCB layout modification is required for package substitution.
Lower Voltage Alternatives (Application-Dependent):
SMBJ60CA-TP (Micro Commercial Co) and SMBJ58E3/TR13 (Microchip) offer reduced standoff voltages (60V and 58V respectively) with correspondingly lower clamping voltages (96.8V and 103V). These parts are suitable only for applications where the lower voltage threshold is acceptable. SMBJ60CA-TP extends the upper operating temperature to 175°C.
Compliance Status:
The original 1SMB64AT3 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting modern manufacturing and environmental requirements.
Frequently Asked Questions (FAQ)
Q: Can SMBJ64A directly replace 1SMB64AT3 on existing PCBs?
A: Yes. SMBJ64A maintains identical electrical specifications (64V standoff, 103V clamping, 5.8A peak pulse) and uses the same DO-214AA (SMB) package. No PCB modification is required.
Q: What is the difference between SMBJ64A and SMBJ64A-HR?
A: Both are direct equivalents with identical voltage and current ratings. SMBJ64A-HR (Littelfuse) maintains the full -65 to 150°C operating range of the original part, while SMBJ64A (Meritek) operates from -55 to 150°C. For applications requiring the extended low-temperature specification, SMBJ64A-HR is preferred.
Q: Can PTVS64VP1UP,115 be used as a substitute?
A: PTVS64VP1UP,115 provides identical electrical performance but uses SOD-128 packaging instead of SMB. This requires PCB layout redesign. The part is AEC-Q101 qualified, making it suitable for automotive applications where the original part is not.
Q: Why are SMBJ60CA-TP and SMBJ58E3/TR13 listed as similar rather than direct substitutes?
A: These parts have lower reverse standoff voltages (60V and 58V) compared to the 1SMB64AT3 (64V). While clamping voltage remains at 103V, the reduced standoff voltage may affect circuit protection thresholds. Use only if application requirements permit lower voltage operation.
Q: Is the 1SMB64AT3 still available?
A: The 1SMB64AT3 is obsolete. Current inventory exists but is limited. SMBJ64A and SMBJ64A-HR are active products with established supply availability.
Q: Are all substitute parts RoHS compliant?
A: Yes. All recommended substitutes are ROHS3 compliant, whereas the original 1SMB64AT3 is RoHS non-compliant. This supports compliance with modern environmental and manufacturing standards.
Q: What package options are available for 64V TVS diodes?
A: The primary package for 64V TVS diodes in this category is DO-214AA (SMB). PTVS64VP1UP,115 offers an alternative SOD-128 package. Package selection depends on PCB layout constraints and thermal management requirements.
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