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Vishay General Semiconductor - Diodes Division SMAJ70CAHM3/I
- Part No.:
- SMAJ70CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHM3/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,476
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Product details
Overview
SMAJ70CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. 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 - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ70CAHM3/I datasheet, SMAJ70CAHM3/I pinout, SMAJ70CAHM3/I application, or SMAJ70CAHM3/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data (RθJA = 120 °C/W), junction temperature range (−55 to +150 °C), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 70 V), while the low incremental surge resistance supports rapid energy dissipation during ESD or lightning-induced surges.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with clamping performance validated under standardized 10/1000 μs waveform testing. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on within specification tolerance. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage limits downstream IC stress during 10/1000 μs surge events. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy handling capacity under standard waveform conditions. |
| TJ range | −55 °C to +150 °C - Enables operation in under-hood automotive and industrial environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, lead-free and halogen-free compliant (HM3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical bidirectional junction; no polarity marking required. |
| Cathode | Terminal K | Opposite terminal of symmetrical junction; identical behavior to Anode under reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JEDEC standards. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with IEC 61249-2-21 and JESD201 Class 2 whisker resistance. |
| 400 W peak pulse power | Withstands high-energy transients common in 12 V/24 V automotive systems and industrial motor drives. |
| Fast response time | Sub-nanosecond clamping enables protection of high-speed interfaces like CAN FD and LIN bus nodes. |
| Low clamping ratio | VC/VBR ≈ 1.45 - Tight voltage margin between breakdown and clamping improves system-level surge margin. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontrollers and CAN transceivers from load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point or IC supply input. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA loops) and digital I/O (e.g., RS-485) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to connector or IC pin to shunt fast transients before propagation. Use Value: Sub-100 pF junction capacitance at 0 V ensures minimal signal integrity impact on 1 Mbps+ communication lines. |
| Consumer Device USB Port Protection | Telecom Equipment AC/DC Input Stage |
Use Scenario: Safeguarding USB 2.0 data lines and VBUS against human-body-model (HBM) ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS mounted inline with D+/D− and VBUS traces near port connector. Use Value: Withstands ±15 kV contact discharge per IEC 61000-4-2 without degradation, preserving signal fidelity. | Use Scenario: Suppressing line-to-line and line-to-ground surges entering telecom power supplies via AC mains or PoE injectors. IC Role / Device Role / Timing Role: Primary-stage TVS across input rectifier output or DC bus to absorb differential-mode transients. Use Value: 400 W rating handles 10/1000 μs surges up to 3.5 A, extending capacitor and MOSFET lifetime in SMPS front ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker rating. | Approved for commercial/industrial use; not certified for automotive under-hood deployment. | Select when halogen-free requirement is waived and cost optimization is prioritized. |
| SMBJ70CAHM3/I | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package; 600 W PPPM rating; higher RθJA (100 °C/W). | Better surge handling margin; larger footprint may limit layout density in space-constrained designs. | Choose when higher pulse power headroom is needed and PCB area permits SMB package. |
Compared with SMAJ70CAHE3/I, the SMAJ70CAHM3/I adds halogen-free compliance and whisker resistance for automotive use; versus SMBJ70CAHM3/I, it trades 200 W pulse power for smaller SMA footprint and tighter board space utilization.
Availability
SMAJ70CAHM3/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor modules, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ70CAHM3/I 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 application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and load dump is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ70CAHM3/I under a 10/1000 μs surge?
The SMAJ70CAHM3/I has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events. The clamping performance is consistent across both polarities due to its bidirectional design, and the SMAJ70CAHM3/I maintains this specification across its full operating temperature range of −55 °C to +150 °C.
Is the SMAJ70CAHM3/I qualified for automotive applications?
Yes, the SMAJ70CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "_I" reel packaging). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness validation. The SMAJ70CAHM3/I is approved for under-hood and chassis-mounted automotive systems where ambient temperatures reach up to +125 °C and transient immunity must meet ISO 7637-2 and ISO 16750-2 requirements.
How does the HM3 suffix differ from the HE3 suffix in the SMAJ70CA family?
The HM3 suffix on SMAJ70CAHM3/I denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, whereas HE3 indicates RoHS compliance only (no halogen-free guarantee). Both are AEC-Q101 qualified, but HM3 meets stricter environmental and reliability standards required by Tier 1 automotive suppliers. The SMAJ70CAHM3/I also uses matte tin plating qualified per J-STD-002 and JESD22-B102, ensuring solderability in high-volume SMT processes.
What is the thermal resistance of the SMAJ70CAHM3/I, and how does it affect PCB layout?
The SMAJ70CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AC outline. To maintain safe junction temperatures below 150 °C during repetitive surge events, designers should ensure adequate copper area and avoid excessive trace length or isolation - the SMAJ70CAHM3/I's RθJL of 30 °C/W further emphasizes the importance of solid thermal connection to internal ground planes.
Can the SMAJ70CAHM3/I be used in bidirectional signal lines such as RS-485 or CAN bus?
Yes, the SMAJ70CAHM3/I is explicitly designed for bidirectional use, as indicated by the "CA" suffix and confirmed in Vishay's documentation. Its symmetrical VBR (77.8–86.0 V) and VC (113 V) apply equally in both directions, making it suitable for protecting differential buses like RS-485, CAN, and LIN. With typical junction capacitance below 100 pF at 0 V, the SMAJ70CAHM3/I introduces negligible signal distortion at data rates up to 1 Mbps, and its fast response time ensures effective suppression of ESD and fast-rising transients on these lines.
SMAJ70CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70CAHM3/I FAQ
1.How can I place an order for SMAJ70CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHM3/I 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 SMAJ70CAHM3/I reliable?
The price and inventory of SMAJ70CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHM3/I?
SMAJ70CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHM3/I 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 SMAJ70CAHM3/I?
For technical support, including SMAJ70CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHM3/I requirements.
6.How does Aetrix verify that SMAJ70CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHM3/I 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 SMAJ70CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHM3/I?
All SMAJ70CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHM3/I, 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 SMAJ70CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ70CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAHM3/I Tags
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