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Vishay General Semiconductor - Diodes Division SMAJ70CAHE3_A/I
- Part No.:
- SMAJ70CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHE3_A/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,153
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Product details
Overview
SMAJ70CAHE3_A/I 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 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ70CAHE3_A/I datasheet, SMAJ70CAHE3_A/I pinout, SMAJ70CAHE3_A/I application, or SMAJ70CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ps) and stable clamping under repetitive transient stress, while the SMA package supports high thermal dissipation via low RθJL (30 °C/W).
The SMAJ70CAHE3_A/I complies with ANSI/IEEE C62.35 standards for transient suppressors and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is rated for -55 °C to +150 °C operating junction temperature and delivers 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 72 V nominal DC bus protection. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 113 V at 3.5 A - clamped voltage during 10/1000 μs surge; limits downstream IC stress to <115 V in 72 V systems. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity testing. |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage at 70 V; avoids parasitic loading on high-impedance sensor bias networks. |
| TJ max. | +150 °C - extended junction temperature rating enables use in under-hood automotive environments without derating. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, and ESD robustness; required for ADAS and body control modules. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Acts as cathode during positive transients and anode during negative transients; symmetric conduction path enables dual-polarity clamping. |
| Cathode | Transient current entry (bidirectional) | Functions identically to Anode terminal; no physical distinction - device has no polarity marking per spec sheet Note on page 1. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge test up to 4 kV (line-earth) in compact SMA footprint. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and infotainment power rails without additional qualification effort. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; eliminates risk of moisture-induced parameter drift in humid environments. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs - critical for 75 V-rated gate drivers and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 72 V battery-fed ECUs against load dump and alternator surge events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input power pins of PMICs or microcontrollers. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or oxide breakdown in 100 V-rated power management ICs. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on 0–10 V or 4–20 mA signal paths. Use Value: Sub-1 μA leakage at 70 V avoids gain error in precision op-amp signal conditioning stages. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Primary-level TVS on bulk DC input before DC/DC converters. Use Value: 400 W rating handles multi-kA induced surges without degradation; DO-214AC footprint fits tight board spacing. |
Use Scenario: Clamping Miller-induced spikes on high-side gate drive traces in 3-phase inverters using 650 V SiC MOSFETs. IC Role / Device Role / Timing Role: Localized transient suppressor adjacent to gate driver IC output pins. Use Value: 113 V clamping prevents unintended turn-on of 120 V-rated gate drivers during fast dV/dt switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM Tier 1 requirements. | Choose SMAJ70CAHE3_A/I for standard AEC-Q101 automotive use; select SMAJ70CA-M3/5A only if halogen-free bill-of-materials is enforced. |
| SMBJ70CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W). | Higher power handling suits higher-energy surge environments (e.g., heavy-duty vehicle alternators), but requires 30% more PCB area. | Use SMAJ70CAHE3_A/I where space-constrained layouts dominate; upgrade to SMBJ70CAHE3_A/I only when >400 W surge margin is verified necessary. |
Compared with SMAJ70CA-M3/5A, SMAJ70CAHE3_A/I offers identical protection performance with standard RoHS compliance; versus SMBJ70CAHE3_A/I, it trades 200 W peak power headroom for 30% smaller footprint - optimal for dense automotive ECUs where layout area is premium.
Availability
SMAJ70CAHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply across long-life production programs.
Supply support for SMAJ70CAHE3_A/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 automotive-grade validation.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMAJ70CAHE3_A/I at its rated peak pulse current?
The SMAJ70CAHE3_A/I has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 100 V-rated ICs. The clamping occurs within picoseconds of transient onset, preserving system integrity during fast-rising surges.
Is SMAJ70CAHE3_A/I suitable for automotive applications?
Yes, SMAJ70CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It undergoes stress testing for high-temperature operation (up to +150 °C TJ), thermal cycling, and humidity robustness - making it appropriate for engine control units, body electronics, and ADAS power domains where reliability is critical.
Does SMAJ70CAHE3_A/I have polarity markings on the package?
No, SMAJ70CAHE3_A/I is a bidirectional TVS diode and carries no polarity marking on the SMA (DO-214AC) case. As confirmed in the Vishay datasheet (page 1, "Polarity" section), bidirectional types like SMAJ70CAHE3_A/I lack cathode band identification - both terminals are functionally identical and interchangeable in circuit layout.
What is the maximum steady-state power dissipation for SMAJ70CAHE3_A/I?
The SMAJ70CAHE3_A/I has a maximum steady-state power dissipation (PD) of 3.3 W when mounted on an infinite heatsink at TA = 50 °C. This rating assumes ideal thermal conditions; actual PCB layout with 5.0 mm × 5.0 mm copper pads per terminal yields lower effective PD due to finite thermal resistance (RθJA = 120 °C/W typical).
How does SMAJ70CAHE3_A/I differ from unidirectional SMAJ70AHE3_A/I?
SMAJ70CAHE3_A/I is bidirectional with symmetrical clamping in both polarities and no cathode marking, whereas SMAJ70AHE3_A/I is unidirectional with a cathode band and conducts only in reverse bias. Their VWM (70 V), VBR (77.8–86.0 V), and VC (113 V) match, but SMAJ70CAHE3_A/I protects AC-coupled or floating lines, while SMAJ70AHE3_A/I suits DC rails with defined ground reference.
SMAJ70CAHE3_A/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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70CAHE3_A/I FAQ
1.How can I place an order for SMAJ70CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHE3_A/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 SMAJ70CAHE3_A/I reliable?
The price and inventory of SMAJ70CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHE3_A/I?
SMAJ70CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHE3_A/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 SMAJ70CAHE3_A/I?
For technical support, including SMAJ70CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ70CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHE3_A/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 SMAJ70CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHE3_A/I?
All SMAJ70CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHE3_A/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 SMAJ70CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ70CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAHE3_A/I Tags
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