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Vishay General Semiconductor - Diodes Division SMAJ70AHE3/5A
- Part No.:
- SMAJ70AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHE3/5A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,263
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Product details
Overview
SMAJ70AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for circuit-level overvoltage protection. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤113 V at 3.5 A peak pulse current (IPPM). It delivers 400 W peak pulse power (10/1000 μs waveform) and is AEC-Q101 qualified for automotive electronics.
For engineers reviewing the SMAJ70AHE3/5A datasheet, SMAJ70AHE3/5A pinout, SMAJ70AHE3/5A application, or SMAJ70AHE3/5A equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), and AEC-Q101 qualification status for under-hood or ADAS subsystems.
Technical Context
This TVS diode operates as a shunt-clamping device across sensitive nodes-cathode connected to the line under protection, anode to ground. Its glass-passivated junction enables fast response (<1 ps) to ESD and lightning-induced surges, with low incremental surge resistance ensuring stable clamping under repetitive transients.
Rated for -55 °C to +150 °C operating junction temperature, it supports high-reliability deployment in automotive powertrain and body control modules. The 1.0 μA max reverse leakage at 70 V and 0.105 %/°C VBR temperature coefficient ensure predictable behavior across thermal extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse working voltage before conduction begins; sets upper limit for normal operation without leakage or stress. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events while avoiding false triggering. |
| VC @ IPPM | ≤113 V at 3.5 A - Clamping voltage defines worst-case voltage seen by downstream ICs during 10/1000 μs surge; critical for I/O rail protection. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; derates to 300 W above 78 V per spec, defining usable voltage range. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current rating validates robustness against load-dump transients in 12 V automotive systems. |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power MOSFETs) without thermal derating penalties in engine bay applications. |
| RθJA | 120 °C/W - Thermal resistance determines self-heating under sustained leakage or repeated pulses; requires minimum 5 mm × 5 mm copper pads per terminal. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection | Connected to signal/power line requiring overvoltage clamping; conducts surge current to ground when VLINE exceeds VBR. |
| Anode | Ground reference | Low-impedance return path to system ground; must be routed with minimal inductance to preserve clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock-enables use in safety-critical ECUs without additional qualification. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a/b (load dump) waveforms in 12 V systems without degradation. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime; eliminates risk of moisture-induced parameter drift in humid environments. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning; eliminates manufacturing delays or yield loss. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage margin required between protected IC's max rating and VC, enabling tighter design margins for modern low-voltage logic. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in body control modules. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT-connected supply rail and ground, activated within picoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or gate oxide damage in 3.3 V/5 V automotive MCUs rated for 40 V absolute max. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional clamping is not used; SMAJ70AHE3/5A serves as unidirectional clamp on sensor VDD rail relative to local ground. Use Value: With 1.0 μA leakage at 70 V, it avoids signal offset errors in precision 24-bit ADCs while surviving 400 W surges. |
| Telecom DC Power Input Protection | Consumer USB-C Port ESD Protection |
|
Use Scenario: Front-end protection for PoE-powered network switches where 48 V DC input faces induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the 48 V input rail upstream of DC-DC converters, coordinated with upstream fuses. Use Value: 70 V VWM provides 46 % headroom above nominal 48 V, while 113 V VC stays below typical 120 V converter input ratings. |
Use Scenario: Secondary-level surge suppression on VBUS line of USB-C receptacles in portable monitors, complementing integrated ESD diodes. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing multi-pulse surges exceeding IEC 61000-4-5 Level 3 (1 kV/2 kV), not just ESD. Use Value: AEC-Q101 qualification ensures long-term stability under thermal cycling in consumer devices, unlike non-automotive grade TVS parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/5A | No AEC-Q101 qualification; same electrical specs and SMA package. | Restricted to commercial/industrial use; not approved for automotive production. | Select when AEC-Q101 is not mandated and cost sensitivity is higher. |
| SMAJ70CAHE3/5A | Bidirectional variant; symmetric VBR (77.8–86.0 V) in both polarities; same VC, PPPM, and package. | Required for AC-coupled lines or bidirectional data buses (e.g., CAN FD) where polarity reversal occurs. | Choose only if bidirectional clamping is needed; unidirectional SMAJ70AHE3/5A offers lower leakage in DC applications. |
Compared with SMAJ70A-E3/5A, the SMAJ70AHE3/5A adds AEC-Q101 validation for automotive use without trade-offs in clamping or power rating; versus SMAJ70CAHE3/5A, it provides lower reverse leakage for DC-biased rails but cannot protect AC signals.
Availability
SMAJ70AHE3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power supplies, and consumer USB-C power delivery systems requiring stable component supply and AEC-Q101 compliance.
Supply support for SMAJ70AHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity.
FAQ
What is the clamping voltage of the SMAJ70AHE3/5A under a 10/1000 μs surge?
The SMAJ70AHE3/5A clamps to a maximum of 113 V when subjected to its rated peak pulse current of 3.5 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 0.2" × 0.2" copper pads per terminal, and represents the worst-case voltage imposed on protected circuitry during surge events.
Is SMAJ70AHE3/5A suitable for automotive applications?
Yes, SMAJ70AHE3/5A is AEC-Q101 qualified, making it suitable for automotive applications including body control modules, infotainment power supplies, and ADAS sensor interfaces. Its qualification covers temperature cycling, humidity bias, and mechanical shock testing-ensuring reliability in under-hood and cabin environments where the SMAJ70AHE3/5A operates from -55 °C to +150 °C.
How does the SMAJ70AHE3/5A differ from the SMAJ70CAHE3/5A?
The SMAJ70AHE3/5A is unidirectional, with cathode marked and conduction only from cathode to anode, whereas SMAJ70CAHE3/5A is bidirectional and symmetrical in both polarities. Both share identical VWM (70 V), VBR, VC, and PPPM, but SMAJ70AHE3/5A exhibits 1.0 μA max reverse leakage at VWM, while the bidirectional version doubles leakage to 2.0 μA for VWM ≤ 10 V (not applicable here).
What is the thermal resistance of SMAJ70AHE3/5A, and how does it affect layout?
The SMAJ70AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). To maintain safe junction temperatures during repetitive surges or elevated ambient conditions, PCB layout must provide adequate copper area and avoid thermal isolation-failure to do so risks exceeding the +150 °C TJ max rating.
Does SMAJ70AHE3/5A meet RoHS and halogen-free requirements?
Yes, SMAJ70AHE3/5A is RoHS-compliant and AEC-Q101 qualified. The "HE3" suffix denotes RoHS-compliant construction with no exemption for lead; it is not halogen-free-the halogen-free variant uses the "HM3" suffix (e.g., SMAJ70AHM3/5A). Material compliance documentation is available per Vishay specification 99912.
SMAJ70AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70AHE3/5A FAQ
1.How can I place an order for SMAJ70AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHE3/5A 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 SMAJ70AHE3/5A reliable?
The price and inventory of SMAJ70AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHE3/5A?
SMAJ70AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHE3/5A 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 SMAJ70AHE3/5A?
For technical support, including SMAJ70AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHE3/5A requirements.
6.How does Aetrix verify that SMAJ70AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHE3/5A 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 SMAJ70AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70AHE3/5A?
All SMAJ70AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHE3/5A, 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 SMAJ70AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ70AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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