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1SMA7.0AT3G Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The 1SMA7.0AT3G is a unidirectional Zener-type transient voltage suppressor manufactured by onsemi in a surface mount SMA (DO-214AC) package. This component is designed for general-purpose overvoltage protection applications with a 7V reverse standoff voltage and 12V maximum clamping voltage. The part is currently listed as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | 1SMA7.0AT3G | — |
| Manufacturer | onsemi | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 7V | V |
| Voltage - Breakdown (Min) | 7.78V | V |
| Voltage - Clamping (Max) @ Ipp | 12V | V |
| Power - Peak Pulse | 400W | W |
| Operating Temperature Range | -65°C to 150°C | °C (TJ) |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AC, SMA | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution of the 1SMA7.0AT3G is determined by the following critical electrical and mechanical parameters:
Electrical Compatibility Criteria:
- Voltage - Reverse Standoff (Typ): 7V ± tolerance
- Voltage - Breakdown (Min): 7.78V minimum
- Voltage - Clamping (Max) @ Ipp: 12V maximum
- Power - Peak Pulse: 400W minimum
- Unidirectional Channels: 1
- Type: Zener
Mechanical Compatibility Criteria:
- Mounting Type: Surface Mount
- Package / Case: DO-214AC or SMA equivalent
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Compliance Requirements:
- RoHS Status: ROHS3 Compliant (preferred for active parts)
- REACH Status: REACH Unaffected
Substitute parts are grouped into two categories: Direct Equivalents (matching all electrical parameters within specification) and Similar Parts (meeting electrical requirements with minor parameter variations within acceptable operating ranges).
Parameter Comparison
| Part Number | Manufacturer | VWM (Typ) [V] | VBR (Min) [V] | VC (Max) [V] | Ipp [A] | Power [W] | Temp Range [°C] | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| 1SMA7.0AT3G | onsemi | 7.0 | 7.78 | 12.0 | — | 400 | -65 to 150 | DO-214AC, SMA | Obsolete |
| SMAJ7.0A | MDD | 7.0 | 7.78 | 12.0 | 33.3 | 400 | -50 to 150 | DO-214AC, SMA | Active |
| P4SMA8.2A | Taiwan Semiconductor Corporation | 7.02 | 7.79 | 12.1 | 34.0 | 400 | -55 to 150 | DO-214AC, SMA | Active |
| P4SMA8.2A-E3/5A | Vishay General Semiconductor - Diodes Division | 7.02 | 7.79 | 12.1 | 33.1 | 400 | -65 to 150 | DO-214AC, SMA | Active |
| P4SMA8.2A-E3/61 | Vishay General Semiconductor - Diodes Division | 7.02 | 7.79 | 12.1 | 33.1 | 400 | -65 to 150 | DO-214AC, SMA | Active |
| P4SMA8.2A-M3/5A | Vishay General Semiconductor - Diodes Division | 7.02 | 7.79 | 12.1 | 33.1 | 400 | -65 to 150 | DO-214AC, SMA | Active |
| P4SMA8.2A-M3/61 | Vishay General Semiconductor - Diodes Division | 7.02 | 7.79 | 12.1 | 33.1 | 400 | -65 to 150 | DO-214AC, SMA | Active |
| SMAJ7.0A-13-F | Diodes Incorporated | 7.0 | 7.78 | 12.0 | 33.3 | 400 | -55 to 150 | DO-214AC, SMA | Active |
| SMAJ7.0AE3/TR13 | Microchip Technology | 7.0 | 7.78 | 12.0 | 41.7 | 500 | -65 to 150 | DO-214AC, SMA | Active |
| SMAJ7.0E3/TR13 | Microchip Technology | 7.0 | 7.78 | 13.3 | 37.8 | 500 | -65 to 150 | DO-214AC, SMA | Active |
Engineering Selection Recommendations
Direct Equivalent Selection: SMAJ7.0A (MDD) and SMAJ7.0A-13-F (Diodes Incorporated) provide direct electrical equivalence to the 1SMA7.0AT3G with identical reverse standoff voltage (7V), breakdown voltage (7.78V), and clamping voltage (12V). Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. SMAJ7.0A offers the highest inventory availability (105,200 units) and is recommended as the primary replacement for direct substitution.
Alternative Equivalent Selection: P4SMA8.2A variants (Vishay General Semiconductor - Diodes Division and Taiwan Semiconductor Corporation) meet all electrical requirements with negligible parameter variations (7.02V standoff, 7.79V breakdown, 12.1V clamping). These parts are active, ROHS3 compliant, and available in multiple packaging configurations. The Vishay variants (P4SMA8.2A-E3/5A, P4SMA8.2A-E3/61, P4SMA8.2A-M3/5A, P4SMA8.2A-M3/61) support the full operating temperature range (-65°C to 150°C) matching the original specification.
Enhanced Performance Option: SMAJ7.0AE3/TR13 (Microchip Technology) provides increased peak pulse current (41.7A) and power rating (500W) while maintaining the same voltage specifications. This part is suitable for applications requiring higher transient energy absorption capacity.
All recommended substitutes are surface mount, DO-214AC/SMA package, with MSL 1 rating and REACH unaffected status.
Frequently Asked Questions (FAQ)
Q: Can I use P4SMA8.2A parts as direct replacements for 1SMA7.0AT3G? A: Yes. The P4SMA8.2A series meets all electrical requirements with clamping voltage of 12.1V (within acceptable tolerance of the 12V specification) and reverse standoff voltage of 7.02V (within the 7V specification). All variants are ROHS3 compliant and surface mount SMA package.
Q: What is the difference between SMAJ7.0A and SMAJ7.0A-13-F? A: Both parts have identical electrical specifications (7V standoff, 7.78V breakdown, 12V clamping, 400W power). The primary difference is manufacturer (MDD vs. Diodes Incorporated) and operating temperature range (SMAJ7.0A: -50°C to 150°C; SMAJ7.0A-13-F: -55°C to 150°C). For applications requiring -65°C operation, neither is suitable; use P4SMA8.2A variants or SMAJ7.0AE3/TR13 instead.
Q: Why does SMAJ7.0E3/TR13 have a different clamping voltage (13.3V)? A: SMAJ7.0E3/TR13 is a similar part with slightly higher clamping voltage. It is suitable only if the application circuit can tolerate 13.3V clamping instead of 12V. Verify circuit requirements before selection.
Q: Are all substitute parts RoHS compliant? A: Yes. All active substitute parts listed are ROHS3 compliant. The original 1SMA7.0AT3G (obsolete) does not specify RoHS status.
Q: What is the significance of the packaging designations (E3/5A, E3/61, M3/5A, M3/61)? A: These designations indicate different tape and reel configurations and lead-free plating specifications. All variants meet the same electrical specifications and are functionally equivalent for circuit design purposes.
Q: Can I substitute SMAJ7.0AE3/TR13 (500W) for the original 400W part? A: Yes. The higher power rating (500W vs. 400W) provides additional margin for transient energy absorption. This is a conservative substitution with no negative impact on circuit performance.
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