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Vishay General Semiconductor - Diodes Division SMAJ70CA-M3/61
- Part No.:
- SMAJ70CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CA-M3/61.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,624
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Product details
Overview
SMAJ70CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 70 V standoff 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 - deployed in automotive infotainment power rails and industrial sensor I/O interfaces.
For engineers reviewing the SMAJ70CA-M3/61 datasheet, SMAJ70CA-M3/61 pinout, SMAJ70CA-M3/61 application, or SMAJ70CA-M3/61 equivalent, this device is evaluated for bidirectional surge immunity in 12 V/24 V DC systems, ESD-prone sensor front-ends, and AEC-Q101-compliant automotive subsystems requiring halogen-free RoHS compliance and MSL Level 1 reflow capability.
Technical Context
The SMAJ70CA-M3/61 operates as a symmetrical avalanche diode with identical forward and reverse conduction characteristics, enabling bidirectional transient suppression without polarity dependency. Its glass-passivated junction ensures stable breakdown behavior under repetitive surges, and its low incremental surge resistance (< 32 Ω, derived from (VC − VBR)/IPPM) supports rapid energy clamping during lightning-induced transients.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, indicating effective heat transfer to PCB copper pads - validated using 0.2" × 0.2" (5.0 mm × 5.0 mm) pad layout per datasheet Fig. 2. The device is rated for TJ = −55 °C to +150 °C and meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin in 12 V/24 V automotive supply lines. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients exceeding system nominal voltage by ≥11%. |
| VC @ IPPM | 113 V at 3.5 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to < 113 V in 70 V-rated circuits. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2/5a in automotive environments. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and load-dump tolerance in unidirectional variants (not applicable here, but confirms rugged junction design). |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive locations and industrial enclosures without derating below 125 °C ambient. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with 0.208" length, 0.157" width, and 0.090" height; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction node | No functional distinction between terminals; either terminal may connect to protected line or ground - simplifies PCB layout and eliminates orientation errors. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with ISO 16750-2 and IEC 61000-4-5 Level 3 surge immunity requirements in 12 V/24 V systems. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life recycling. |
| MSL Level 1 (260 °C peak) | Permits single-pass lead-free reflow without pre-baking; reduces production cost and avoids moisture-related popcorning failures. |
| AEC-Q101 qualified variant available | HE3/HM3 versions meet automotive qualification for reliability in engine control, body electronics, and ADAS sensor modules. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - critical for protecting 75 V-rated MOSFETs and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Suppresses load dump and jump-start transients on 12 V/24 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power rail and chassis ground to limit voltage excursions to ≤113 V. Use Value: Prevents permanent damage to 75 V-rated DC-DC controllers and microcontrollers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields analog output lines of pressure/temperature sensors from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bidirectional clamp across differential or single-ended signal pairs. Use Value: Maintains signal integrity below 1 MHz while diverting >15 kV HBM ESD pulses away from precision ADC inputs. |
| Telecom Interface Port Protection | Consumer USB Power Delivery Path |
|
Use Scenario: Protects RS-485 transceiver I/O pins against lightning-induced surges in outdoor base station backhaul links. IC Role / Device Role / Timing Role: Primary-level TVS on bus lines, coordinated with secondary GDT or polymer PTC for staged protection. Use Value: Limits clamped voltage to <115 V during 10/1000 μs surges, preserving ±7 V common-mode tolerance of ISO 8482-compliant transceivers. |
Use Scenario: Guards 5–20 V USB PD input rails in portable monitors and docking stations against adapter fault transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of buck converter input to absorb 400 W surges without triggering OVP shutdown. Use Value: Enables sustained operation after repeated 100 V/100 ns transients - verified per IEC 61000-4-4 Electrical Fast Transient testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-E3/61 | Same electrical specs and package; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial-grade industrial equipment where halogen-free mandate is not enforced. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMAJ70CAHM3_A/61 | Identical specs plus AEC-Q101 qualification; HM3 denotes halogen-free + automotive grade. | Required for automotive subsystems subject to OEM PPAP and long-term reliability validation (e.g., infotainment head units). | Choose for automotive designs needing full qualification traceability and extended temperature cycling performance. |
Compared with SMAJ70CA-M3/61, the E3 variant offers lower procurement cost for non-automotive use, while the HM3_A version adds AEC-Q101 validation and full automotive lifecycle support - making SMAJ70CA-M3/61 the optimal balance of halogen-free compliance and broad industrial applicability without automotive overhead.
Availability
SMAJ70CA-M3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom port surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ70CA-M3/61 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, thermal performance, and automotive-grade qualification.
The SMAJ series targets high-energy transient suppression in harsh environments - engineered for ISO 7637-2, IEC 61000-4-5, and AEC-Q101 compliance with standardized DO-214AC packaging for manufacturability.
FAQ
What is the clamping voltage of the SMAJ70CA-M3/61 under a 10/1000 μs surge?
The SMAJ70CA-M3/61 has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. Engineers must verify that downstream components tolerate up to 113 V to ensure robust design margin.
Is the SMAJ70CA-M3/61 suitable for automotive applications?
The SMAJ70CA-M3/61 itself is commercial-grade and halogen-free RoHS-compliant, but not AEC-Q101 qualified. However, Vishay offers the pin-compatible SMAJ70CAHM3_A/61 variant - identical in all electrical and mechanical specifications except for added AEC-Q101 qualification. For automotive use, specify the HM3_A version; SMAJ70CA-M3/61 remains appropriate for industrial and consumer applications requiring halogen-free compliance without automotive certification.
What is the standoff voltage rating of the SMAJ70CA-M3/61?
The SMAJ70CA-M3/61 has a reverse standoff voltage (VWM) of 70 V - the maximum continuous DC or RMS voltage the device blocks without exceeding 1 μA leakage current. This rating ensures compatibility with 12 V and 24 V automotive and industrial power systems where nominal voltages remain below 70 V, providing adequate margin against ripple and tolerance drift while avoiding premature conduction.
Does the SMAJ70CA-M3/61 have polarity markings on the package?
No, the SMAJ70CA-M3/61 does not have polarity markings because it is a bidirectional TVS diode. Its SMA (DO-214AC) package features symmetrical terminals with identical electrical behavior in both directions - eliminating the need for cathode band identification. This simplifies assembly and prevents misorientation during automated placement, unlike unidirectional variants such as SMAJ70A-M3/61 which include a cathode band.
What is the thermal resistance of the SMAJ70CA-M3/61?
The SMAJ70CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on standard 0.2" × 0.2" copper pads per Vishay datasheet Fig. 2. These values assume proper PCB layout with thermal relief; exceeding 150 °C junction temperature risks parametric shift or failure, so designers must validate thermal performance under worst-case power dissipation in their specific layout.
SMAJ70CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ70CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ70CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CA-M3/61?
SMAJ70CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CA-M3/61 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-M3/61?
For technical support, including SMAJ70CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ70CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70CA-M3/61?
All SMAJ70CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ70CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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