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Vishay General Semiconductor - Diodes Division SMAJ70A-M3/5A
- Part No.:
- SMAJ70A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70A-M3/5A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,053
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Product details
Overview
SMAJ70A-M3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 3.5 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed in automotive body control modules to safeguard microcontrollers and CAN transceivers against load dump and inductive switching transients.
For engineers reviewing the SMAJ70A-M3/5A datasheet, SMAJ70A-M3/5A pinout, SMAJ70A-M3/5A application, or SMAJ70A-M3/5A equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) surface-mount package, 1.0 μA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature range, and halogen-free RoHS-compliant construction (M3 suffix).
Technical Context
This TVS diode operates as a clamping device: under normal conditions it presents high impedance (>1 GΩ) with only 1.0 μA leakage at 70 V; during transient events exceeding VBR, it avalanches rapidly (<1 ns response) to limit voltage across protected circuitry to ≤113 V. Its low incremental surge resistance ensures minimal voltage overshoot during high-current surges up to 3.5 A.
The SMAJ70A-M3/5A is rated for 400 W peak pulse power (10/1000 μs) at TA = 25 °C, derating linearly above 25 °C per Fig. 2, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. It meets MSL Level 1 per J-STD-020 and supports reflow soldering with peak temperature up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Breakdown onset range; ensures reliable triggering above nominal system voltage. |
| VC @ IPPM | 113 V at 3.5 A - Clamped voltage during worst-case 10/1000 μs surge; determines protection level for downstream ICs. |
| PPPM | 400 W - Peak transient energy absorption capacity; sufficient for ISO 7637-2 Pulse 1/2a/5a in 12 V automotive systems. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports infrequent high-energy events like jump-starts. |
| TJ Range | -55 °C to +150 °C - Full automotive-grade junction temperature range; enables under-hood deployment. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 5.28 mm × 4.93 mm footprint; compatible with automated placement. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a band on the body end; anode is opposite end. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with ISO 7637-2 Pulse 5a (load dump) without external series impedance. |
| 113 V clamping voltage at 3.5 A | Limits stress on 100 V-rated MOSFETs and 5 V/3.3 V logic interfaces in 24 V industrial systems. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive OEM environmental requirements and supports lead-free reflow assembly (260 °C peak). |
| MSL Level 1 moisture sensitivity | Allows indefinite floor life without dry pack; eliminates baking prior to SMT assembly. |
| Low 1.0 μA leakage at 70 V | Minimizes standby power loss in always-on automotive modules such as telematics and gateway ECUs. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller GPIOs from relay coil flyback and battery reverse connection transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between LIN line and ground, triggered within <1 ns of overvoltage onset. Use Value: Maintains LIN communication integrity during 100 V/500 ms load dump events while adding <0.5 mm² PCB area. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input filter stage, absorbing >90 % of 1 kV/500 Ω surge energy per IEC 61000-4-5. Use Value: Eliminates need for secondary MOV-based protection, reducing BOM count and enabling compact DIN-rail mount design. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: Safeguards AC-DC adapter primary-side controller ICs from lightning-induced surges on 48 V PoE injectors. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC output rail, clamping fast-rising transients before they reach DC-DC converters. Use Value: Prevents latch-up in synchronous rectifier drivers during 600 V/100 ns ring wave transients per IEEE C62.41. |
Use Scenario: Suppresses commutation spikes from brushed DC motors in smart vacuum cleaners and power tools. IC Role / Device Role / Timing Role: Bidirectional-capable but used unidirectionally across motor terminals to clamp back-EMF spikes to ≤113 V. Use Value: Extends H-bridge MOSFET lifetime by limiting VDS overshoot to 80 % of rated 150 V breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable for commercial/industrial use where halogen-free requirement is absent. | Select E3 when cost sensitivity outweighs automotive environmental mandates. |
| SMBJ70A-M3 | Same VWM/VC, but SMB package (DO-214AA) - 30 % larger footprint, higher PPPM (600 W). | Better suited for higher-energy transients; requires PCB layout change. | Choose SMBJ70A-M3 only if system-level testing shows 400 W insufficient for worst-case surge profile. |
Compared with SMAJ70A-E3/5A, the SMAJ70A-M3/5A adds halogen-free compliance for automotive qualification, while SMBJ70A-M3 trades compactness for higher surge margin-neither is pin-compatible, requiring layout revision for substitution.
Availability
SMAJ70A-M3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMAJ70A-M3/5A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive qualification.
The SMAJ series delivers standardized, high-reliability TVS diodes optimized for board-level transient protection in harsh environments-designed specifically for ISO 16750 and AEC-Q101-compliant automotive subsystems.
FAQ
What is the clamping voltage of the SMAJ70A-M3/5A under a 10/1000 μs surge?
The SMAJ70A-M3/5A clamps to a maximum of 113 V when subjected to its rated peak pulse current of 3.5 A using the standard 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ70A-M3/5A maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is the SMAJ70A-M3/5A suitable for automotive applications?
Yes, the SMAJ70A-M3/5A is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/5A variant is halogen-free and RoHS-compliant, making it suitable for automotive body electronics where AEC-Q101 is not mandated but environmental compliance is required. It meets ISO 7637-2 Pulse 1, 2a, and 5a test levels when properly mounted on recommended copper pads. The SMAJ70A-M3/5A is commonly used in junction boxes and lighting control units.
What does the "M3" suffix indicate in SMAJ70A-M3/5A?
The "M3" suffix denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements. Unlike the E3 variant, M3 uses bromine- and chlorine-free molding compounds and plating chemistries-critical for automotive Tier 1 suppliers with strict material declarations. The SMAJ70A-M3/5A retains identical electrical characteristics and thermal performance as its E3 counterpart.
How does the SMAJ70A-M3/5A compare to bidirectional TVS diodes like SMAJ70CA?
The SMAJ70A-M3/5A is unidirectional and intended for DC line protection with defined polarity, whereas SMAJ70CA provides symmetrical clamping for AC or floating signal lines. SMAJ70A-M3/5A offers lower leakage (1.0 μA vs. 2.0 μA for SMAJ70CA) and slightly tighter VBR tolerance. For 24 V DC systems with grounded return paths, SMAJ70A-M3/5A delivers superior noise immunity and lower standby loss. The SMAJ70A-M3/5A cannot replace SMAJ70CA in AC-coupled applications without circuit redesign.
What is the thermal resistance of the SMAJ70A-M3/5A, and how does it affect PCB layout?
The SMAJ70A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain reliability under repetitive surges, designers must allocate ≥5 mm² of 2-oz copper per pad and avoid thermal isolation. The SMAJ70A-M3/5A's thermal performance directly impacts its ability to sustain multiple 400 W pulses without exceeding 150 °C junction temperature.
SMAJ70A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70A-M3/5A FAQ
1.How can I place an order for SMAJ70A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70A-M3/5A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ70A-M3/5A reliable?
The price and inventory of SMAJ70A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70A-M3/5A?
SMAJ70A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70A-M3/5A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ70A-M3/5A?
For technical support, including SMAJ70A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70A-M3/5A requirements.
6.How does Aetrix verify that SMAJ70A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70A-M3/5A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ70A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70A-M3/5A?
All SMAJ70A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70A-M3/5A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ70A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ70A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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