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Vishay General Semiconductor - Diodes Division SMAJ70A-E3/5A
- Part No.:
- SMAJ70A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70A-E3/5A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ70A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on DC power rails 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 (IPPM), and 400 W peak pulse power rating with a 10/1000 μs waveform - deployed in automotive body control modules, industrial PLC I/O terminals, and 24 V sensor interface circuits.
For engineers reviewing the SMAJ70A-E3/5A datasheet, SMAJ70A-E3/5A pinout, SMAJ70A-E3/5A application, or SMAJ70A-E3/5A equivalent, key selection criteria include clamping performance under 3.5 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant SMA (DO-214AC) packaging, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This device operates as a clamping-type TVS diode, leveraging an avalanche breakdown mechanism to limit transient voltages before they damage downstream ICs or MOSFETs. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at 70 V), while the low incremental surge resistance enables rapid energy absorption during ESD or load-switching events.
The SMAJ70A-E3/5A is rated for non-repetitive 10/1000 μs surges up to 400 W below 78 V (derated to 300 W above), with thermal performance validated on 5.0 mm × 5.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and supports automated SMT placement with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V/48 V systems. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Tight 10.6% tolerance ensures predictable turn-on across temperature and production lots. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage limits stress on protected 75 V-rated components during transients. |
| PPPM | 400 W (10/1000 μs) - Sustains high-energy surges typical of ISO 7637-2 Pulse 1/2a in automotive environments. |
| RθJA | 120 °C/W - Requires minimal PCB copper area (0.2" × 0.2") for thermal management in space-constrained designs. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands inrush currents without degradation in power supply input stages. |
| Polarity | Unidirectional - Cathode band marks terminal; blocks forward conduction, clamps only reverse transients. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band denotes terminal 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional clamping | Connected to protected line (e.g., 24 V rail); clamps when voltage exceeds VBR relative to ground. |
| Anode (non-banded end) | Reference/ground return path | Must be tied to system ground or low-impedance reference; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with ISO 7637-2 Pulse 1 (inductive switch-off) and IEC 61000-4-5 surge immunity requirements. |
| 113 V clamping voltage at 3.5 A | Provides ≥5 V margin below 118 V max rating of common 24 V industrial controllers and gate drivers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking; compatible with standard lead-free assembly processes (260 °C peak). |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current across -55 °C to +150 °C operating range. |
| RoHS-compliant, halogen-free option (M3 suffix) | Meets IPC-1752A material declaration requirements for automotive and green electronics programs. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Terminal |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power pins from load-dump spikes and relay coil flyback in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between 12 V supply rail and chassis ground. Use Value: Limits transient excursions to ≤113 V, preventing latch-up or oxide breakdown in 16 V-rated LDOs and 5 V logic interfaces. |
Use Scenario: Shields 24 V digital input circuitry from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on optocoupler input side, upstream of series current-limiting resistor. Use Value: Absorbs 400 W pulses without degradation, maintaining <1 μA leakage at 24 V to preserve input threshold accuracy. |
| 48 V Mild Hybrid Vehicle DC-DC Converter | Smart Sensor Signal Conditioning Board |
Use Scenario: Guards high-side gate driver supply against voltage reversal and switching noise in 48 V–12 V buck converters. IC Role / Device Role / Timing Role: Reverse-polarity and transient suppressor on VDD pin of isolated gate driver IC. Use Value: Withstands 40 A surge (IFSM) during cold-crank events while maintaining 70 V standoff for normal operation. |
Use Scenario: Protects analog front-end ADC inputs from ESD and cable discharge events in industrial temperature sensors. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) unidirectional clamp on differential signal pair referenced to local AGND. Use Value: Clamps sub-100 ns ESD transients to <113 V without distorting mV-level sensor signals due to fast response and low dynamic impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and package. | No functional difference; selected where halogen-free materials are mandated (e.g., EU automotive Tier 1). | Direct drop-in replacement for SMAJ70A-E3/5A when halogen-free compliance is required. |
| SMAJ70CA-E3/5A | Bidirectional version; symmetric VBR (77.8–86.0 V) in both directions; no polarity marking. | Used in AC-coupled or floating signal lines (e.g., RS-485, CAN FD) requiring bidirectional clamping. | Select only if protection is needed for both positive and negative transients; not suitable for DC rail clamping with defined polarity. |
Compared with SMAJ70A-E3/5A, the M3 variant offers identical protection performance with halogen-free construction, while the SMAJ70CA-E3/5A provides symmetrical clamping but sacrifices unidirectional DC blocking - making it unsuitable for polarized power rail applications.
Availability
SMAJ70A-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and smart sensor interfaces requiring stable component supply, consistent RoHS compliance, and full traceability through Vishay's authorized channel.
Supply support for SMAJ70A-E3/5A 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, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series was developed for surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, high surge capability, and AEC-Q101 readiness are critical.
FAQ
What is the maximum clamping voltage of the SMAJ70A-E3/5A under a 10/1000 μs surge?
The SMAJ70A-E3/5A 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 measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ70A-E3/5A maintains this clamping performance across its specified operating temperature range.
Does the SMAJ70A-E3/5A meet AEC-Q101 qualification standards?
The SMAJ70A-E3/5A itself is commercial-grade and RoHS-compliant (E3 suffix), but not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ70AHE3_X variant (e.g., SMAJ70AHE3_A) which carries AEC-Q101 qualification. For automotive applications requiring qualification, the HE3 suffix version must be specified - the SMAJ70A-E3/5A is intended for industrial and consumer use where AEC-Q101 is not mandated.
What is the thermal resistance junction-to-ambient for the SMAJ70A-E3/5A?
The SMAJ70A-E3/5A has a typical thermal resistance junction-to-ambient (RθJA) of 120 °C/W when mounted on the minimum recommended 5.0 mm × 5.0 mm copper pad per terminal. This value assumes natural convection and is critical for calculating junction temperature rise under sustained power dissipation. The SMAJ70A-E3/5A also exhibits RθJL = 30 °C/W (junction-to-lead), supporting thermal design in constrained layouts.
How does the SMAJ70A-E3/5A differ from the SMAJ70CA-E3/5A?
The SMAJ70A-E3/5A is unidirectional with a cathode band marking and clamps only reverse-voltage transients, while the SMAJ70CA-E3/5A is bidirectional with no polarity marking and clamps transients of either polarity. Their VBR and VC values are identical, but the SMAJ70CA-E3/5A cannot block forward current - making it unsuitable for DC rail protection where polarity matters. The SMAJ70A-E3/5A is preferred for 24 V/48 V power line protection.
What is the peak forward surge current rating for the SMAJ70A-E3/5A?
The SMAJ70A-E3/5A has a peak forward surge current (IFSM) rating of 40 A for an 8.3 ms single half-sine wave, per JEDEC standards. This rating applies only to unidirectional types and validates robustness against inrush or fault currents in power supply inputs. The SMAJ70A-E3/5A sustains this surge without parametric shift or bond-wire failure when mounted per recommended pad layout.
SMAJ70A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70A-E3/5A FAQ
1.How can I place an order for SMAJ70A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70A-E3/5A 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 SMAJ70A-E3/5A reliable?
The price and inventory of SMAJ70A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70A-E3/5A?
SMAJ70A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70A-E3/5A 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 SMAJ70A-E3/5A?
For technical support, including SMAJ70A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70A-E3/5A requirements.
6.How does Aetrix verify that SMAJ70A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70A-E3/5A 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 SMAJ70A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70A-E3/5A?
All SMAJ70A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70A-E3/5A, 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 SMAJ70A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ70A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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