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Vishay General Semiconductor - Diodes Division SMAJ70AHE3/61
- Part No.:
- SMAJ70AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHE3/61.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,152
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Product details
Overview
SMAJ70AHE3/61 from Vishay General Semiconductor is a unidirectional 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 - suitable for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ70AHE3/61 datasheet, SMAJ70AHE3/61 pinout, SMAJ70AHE3/61 application, or SMAJ70AHE3/61 equivalent, this AEC-Q101 qualified TVS offers verified surge immunity for 12 V/24 V DC systems, low-leakage reverse operation up to 1 μA at VWM, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive PCB assembly and ESD-prone sensor front-ends.
Technical Context
This unidirectional TVS operates as a fast-acting shunt clamp: under normal bias it presents high impedance (<1 μA leakage at 70 V), but triggers within <1 ns when transient voltage exceeds VBR, diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients), with thermal resistance RθJA = 120 °C/W enabling operation up to +150 °C junction temperature. It is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and supports automated SMT placement per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 77.8–86.0 V at 1 mA - precise triggering threshold for transient suppression |
| VC (Clamping Voltage) | 113 V at 3.5 A IPPM - limits downstream voltage stress during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - energy-handling capacity for repetitive transients |
| IPPM (Peak Pulse Current) | 3.5 A - maximum surge current sustained without degradation |
| TJ max. | +150 °C - enables use in under-hood automotive environments and industrial enclosures |
| Leakage (ID) | ≤1.0 μA at 70 V - negligible standby power loss in battery-powered systems |
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 marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path during clamping |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., 24 V rail or sensor output); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH - no bake required prior to reflow |
| Glass passivated junction | Stable VBR tolerance and low leakage across -55 °C to +150 °C operating range |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3a/b (load dump surges) |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage margin needed for protected ICs' absolute maximum ratings |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V/24 V vehicle power distribution networks. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between battery rail and DC-DC converter input. Use Value: Limits voltage to ≤113 V during 350 V/100 ms surges, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at sensor connector interface, grounded to chassis. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) within <1 ns while adding <0.5 pF parasitic capacitance. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier and controller ICs against lightning-induced surges. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input to absorb differential-mode transients. Use Value: Handles 400 W peak pulses without thermal runaway, maintaining VWM stability over 1000+ surge events. |
Use Scenario: Front-end protection for Ethernet PHYs and RS-485 transceivers in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Paired with gas discharge tube (GDT) in hybrid protection circuit. Use Value: Provides fast response (<1 ns) to fast-rising transients while GDT handles high-energy follow-on current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70AE3/61 | Commercial-grade (non-AEC-Q101), identical electrical specs and package | Lacks automotive qualification; unsuitable for under-hood or safety-critical modules | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation |
| SMBJ70AHE3/61 | Same VWM/VC, but SMB (DO-214AA) package - 29 % larger footprint, 10 % higher RθJA | Better thermal dissipation (3.5 W vs. 3.3 W PD), but incompatible with dense SMA layouts | Choose when board space allows and higher surge repetition rate demands improved thermal margin |
Compared with SMAJ70AE3/61, the SMAJ70AHE3/61 adds AEC-Q101 assurance for automotive deployment; versus SMBJ70AHE3/61, it trades thermal headroom for compactness - making SMAJ70AHE3/61 optimal for space-constrained, qualified automotive ECUs and industrial controllers.
Availability
SMAJ70AHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom line-card protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ70AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series targets high-speed transient suppression in harsh environments, engineered for automotive, industrial, and telecom systems where robustness, fast response, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ70AHE3/61 at its rated peak pulse current?
The SMAJ70AHE3/61 has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ70AHE3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ70AHE3/61 suitable for bidirectional transient protection?
No, SMAJ70AHE3/61 is a unidirectional TVS diode - it conducts only in reverse bias above VBR and blocks forward current beyond its 3.5 V forward voltage at 25 A. For bidirectional protection, Vishay specifies the SMAJ70CA variant. Using SMAJ70AHE3/61 in AC or floating signal paths risks forward conduction failure; always verify polarity alignment in schematic and layout for SMAJ70AHE3/61.
Does SMAJ70AHE3/61 meet automotive qualification standards?
Yes, SMAJ70AHE3/61 is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in the datasheet (page 3, Note 1). This qualification covers stress tests including HTGB, HTRB, temperature cycling, and ESD, validating its suitability for automotive powertrain, body, and ADAS modules. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction.
What is the maximum operating temperature for SMAJ70AHE3/61?
The SMAJ70AHE3/61 has a maximum junction temperature (TJ) of +150 °C and an operating/storage temperature range of -55 °C to +150 °C. Its thermal resistance RθJA is 120 °C/W (typical), meaning a 3.3 W power dissipation raises junction temperature by 396 °C above ambient - thus derating is essential. At 25 °C ambient, the device supports full 3.3 W continuous dissipation only with adequate copper pad area (0.2" × 0.2") per Vishay's layout recommendation.
How does the leakage current of SMAJ70AHE3/61 compare to similar TVS diodes?
SMAJ70AHE3/61 exhibits ≤1.0 μA maximum reverse leakage (ID) at its 70 V stand-off voltage (VWM), measured at 25 °C. This is typical for unidirectional SMAJ-series devices and significantly lower than many legacy TVS families (e.g., P6KE series: ~5 μA at same VWM). Low leakage preserves battery life in always-on automotive modules and avoids false triggering in high-impedance sensor bias networks.
SMAJ70AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMAJ70AHE3/61 FAQ
1.How can I place an order for SMAJ70AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHE3/61 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 SMAJ70AHE3/61 reliable?
The price and inventory of SMAJ70AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHE3/61?
SMAJ70AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHE3/61 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 SMAJ70AHE3/61?
For technical support, including SMAJ70AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHE3/61 requirements.
6.How does Aetrix verify that SMAJ70AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHE3/61 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 SMAJ70AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70AHE3/61?
All SMAJ70AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHE3/61, 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 SMAJ70AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ70AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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