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Vishay General Semiconductor - Diodes Division SMAJ70CA-M3/5A
- Part No.:
- SMAJ70CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CA-M3/5A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,804
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Product details
Overview
SMAJ70CA-M3/5A from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power 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 with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ70CA-M3/5A datasheet, SMAJ70CA-M3/5A pinout, SMAJ70CA-M3/5A application, or SMAJ70CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the SMA package supports high thermal dissipation (RθJA = 120 °C/W, RθJL = 30 °C/W) under repetitive surge conditions up to 0.01% duty cycle.
The device meets AEC-Q101 qualification when ordered with HE3/HM3 suffixes, though SMAJ70CA-M3/5A itself is commercial-grade. It exhibits a temperature coefficient of VBR of +0.105 %/°C and maintains ≤1.0 μA reverse leakage at 70 V (VWM), enabling reliable protection in ambient temperatures from –55 °C to +150 °C without derating below 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin for 48 V or 60 V DC bus protection. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage limits downstream component stress during 10/1000 μs transients; enables robust protection of 100 V-rated devices. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surge immunity testing. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports protection against inductive switch-off spikes in relay or solenoid drivers. |
| TJ max | +150 °C - Maximum junction temperature allows operation in under-hood automotive or enclosed industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - Low-profile SMT package with matte tin-plated leads; compatible with J-STD-002 solderability and JESD22-B102 whisker testing. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable. Case outline conforms to JEDEC DO-214AC standard; mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per lead for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically; no cathode band marking - enables placement without orientation check during automated assembly. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe transients per ISO 7637-2 and IEC 61000-4-5 without parallel staging. |
| 113 V clamping voltage at 3.5 A | Limits voltage overshoot to <1.6× VWM, preserving margin for 100 V-rated downstream FETs or regulators. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without pre-baking; eliminates moisture-related popcorning risk. |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for EU, China RoHS, and automotive OEM material declarations. |
| Low incremental surge resistance | Minimizes VC rise under high di/dt events, improving clamping precision for fast-rising ESD or lightning-induced surges. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator transients in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at input filter stage before DC/DC converter and microcontroller power rails. Use Value: Withstands 400 W pulses and clamps to 113 V, preventing damage to 100 V-rated buck controllers and CAN transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) transient shunt mounted directly at connector entry point before signal conditioning amplifier. Use Value: Sub-μA leakage at 70 V ensures minimal offset error in mV-level sensor signals; fast response preserves signal integrity during 1 ns–100 ns EFT bursts. |
| Telecom DC Power Input | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges on Ethernet cables and auxiliary DC inputs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 57 V nominal DC input rail, coordinated with upstream fuse and common-mode choke. Use Value: 70 V VWM aligns with IEEE 802.3af/at voltage margins; 113 V VC ensures downstream 120 V-rated rectifiers remain within SOA. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Across-the-line TVS connected between motor terminals to absorb inductive kickback during PWM switching. Use Value: 40 A IFSM rating handles repeated 8.3 ms half-sine surges from motor turn-off; bidirectional symmetry avoids polarity dependency in AC-coupled drive circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive commercial gear). | Select E3 for cost-sensitive, non-automotive applications with standard RoHS needs. |
| SMAJ70A-M3/5A | Unidirectional version; includes cathode band marking and forward voltage drop (~3.5 V at 25 A). | Required only where DC polarity is fixed and reverse conduction must be blocked (e.g., single-rail supply inputs). | Choose unidirectional SMAJ70A-M3/5A only if system topology prohibits reverse current flow during fault conditions. |
Compared with SMAJ70CA-M3/5A, the E3 variant offers identical protection performance without halogen-free certification, while the unidirectional SMAJ70A-M3/5A adds polarity control at the cost of bidirectional flexibility - making SMAJ70CA-M3/5A optimal for AC-coupled, floating, or polarity-agnostic surge paths.
Availability
SMAJ70CA-M3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC input hardening, and consumer appliance motor drive circuits requiring stable component supply, halogen-free compliance, and AEC-Q101-ready scalability.
Supply support for SMAJ70CA-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, repeatable clamping, and SMT manufacturability are critical.
FAQ
What is the clamping voltage of SMAJ70CA-M3/5A at its rated peak pulse current?
The SMAJ70CA-M3/5A has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components exposed to this TVS will experience no more than 113 V during specified surge events - critical for ensuring compatibility with 100 V-rated ICs and MOSFETs in the protected circuit.
Is SMAJ70CA-M3/5A suitable for automotive applications?
SMAJ70CA-M3/5A is commercial-grade and not AEC-Q101 qualified by default; however, it shares identical electrical and mechanical specifications with the AEC-Q101-qualified SMAJ70CA-HM3_X variants. For production automotive use, specify HM3 suffix with revision code (e.g., SMAJ70CA-HM3_A); SMAJ70CA-M3/5A remains appropriate for automotive prototyping, non-safety-critical subsystems, or Tier 2 industrial applications requiring halogen-free compliance.
How does the bidirectional design of SMAJ70CA-M3/5A affect PCB layout?
The bidirectional design of SMAJ70CA-M3/5A eliminates polarity constraints - there is no cathode band marking, and both terminals are functionally identical. This simplifies PCB layout by removing orientation checks during placement, reduces assembly errors, and allows flexible routing in AC-coupled or floating signal/power paths. Layout must still follow Vishay's recommended 5.0 mm × 5.0 mm copper pad per terminal to sustain full 400 W pulse rating.
What is the maximum operating temperature for SMAJ70CA-M3/5A?
SMAJ70CA-M3/5A has a specified operating junction temperature range of –55 °C to +150 °C. Its thermal resistance values (RθJA = 120 °C/W, RθJL = 30 °C/W) allow sustained operation at full ratings up to +125 °C ambient when mounted on minimum recommended copper pads - making it suitable for under-hood automotive modules, enclosed industrial drives, and high-density power converters where thermal headroom is limited.
Does SMAJ70CA-M3/5A meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ70CA-M3/5A meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means the device can be processed using standard lead-free reflow profiles without pre-baking, eliminating moisture-related defects such as popcorning or delamination - a key advantage for high-throughput SMT lines producing automotive and industrial control boards.
SMAJ70CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ70CA-M3/5A FAQ
1.How can I place an order for SMAJ70CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CA-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 SMAJ70CA-M3/5A reliable?
The price and inventory of SMAJ70CA-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 SMAJ70CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CA-M3/5A?
SMAJ70CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CA-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 SMAJ70CA-M3/5A?
For technical support, including SMAJ70CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ70CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70CA-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 SMAJ70CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70CA-M3/5A?
All SMAJ70CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CA-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 SMAJ70CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ70CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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