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Vishay General Semiconductor - Diodes Division SMAJ70CAHE3/5A
- Part No.:
- SMAJ70CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHE3/5A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,216
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Product details
Overview
SMAJ70CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on power and signal lines. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown range (VBR), 113 V clamping voltage (VC) at 3.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMAJ70CAHE3/5A datasheet, SMAJ70CAHE3/5A pinout, SMAJ70CAHE3/5A application, or SMAJ70CAHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional symmetry, DO-214AC (SMA) package compatibility, and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding VWM, it avalanches symmetrically in both directions to clamp voltage at ≤113 V while diverting up to 3.5 A (10/1000 μs). Its low incremental surge resistance and fast response (<1 ps) ensure minimal let-through energy to downstream ICs like microcontrollers or CAN transceivers.
Thermally, it sustains operation from –55 °C to +150 °C junction temperature, with RθJA = 120 °C/W (on 5.0 mm × 5.0 mm copper pads) and RθJL = 30 °C/W. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification - critical for automotive-grade reliability in engine control, ADAS sensors, and infotainment power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin below system rail. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - guaranteed avalanche onset range; ensures consistent triggering across production lots. |
| VC @ IPPM | 113 V at 3.5 A (10/1000 μs) - peak clamped voltage seen by protected circuit; directly limits stress on downstream MOSFETs or logic ICs. |
| PPPM | 400 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against load dump events in 12 V automotive systems. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood environments without derating at full power. |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm × 4.50 mm footprint; compatible with standard SMT reflow profiles (MSL level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration - no polarity marking; symmetrical terminals enable placement without orientation constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically; clamps voltage surges of either polarity between them - eliminates need for directional layout verification. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS; supports 15-year lifecycle requirements. |
| 400 W peak pulse power (10/1000 μs) | Withstands repeated IEC 61000-4-5 surges up to 4 kV without degradation - critical for telecom base station power inputs. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs; improves margin for 3.3 V or 5 V logic interfacing with 12 V supply rails. |
| Glass passivated junction | Ensures stable leakage (<1.0 μA at 70 V) and long-term reliability under thermal cycling and humidity exposure. |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102; eliminates whisker risk (JESD 201 Class 2 compliant). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping device placed upstream of LDO regulators and MCU VDD pins. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or gate oxide damage in 3.3 V/5 V MCUs during 120 V/500 ms load dump events. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) in factory automation sensors exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential signal pairs or single-ended lines referenced to chassis ground. Use Value: Maintains signal integrity by clamping ±15 kV ESD (IEC 61000-4-2) and 1 kV ring wave (IEC 61000-4-12) without affecting DC offset or bandwidth. |
| Telecom AC/DC Power Input Stage | Consumer Device USB/Type-C Port Protection |
|
Use Scenario: Secondary-side transient suppression on 48 V telecom power supplies feeding PoE injectors or remote radio units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC output rails prior to DC-DC converters and ASIC power domains. Use Value: Absorbs 400 W surges from lightning-induced coupling on building wiring, enabling compliance with GR-1089-CORE Level 3 requirements. |
Use Scenario: Bidirectional protection of VBUS and CC lines in USB Type-C ports against hot-plug transients and ESD during cable insertion. IC Role / Device Role / Timing Role: Low-capacitance (CJ < 100 pF at 0 V) shunt clamp placed adjacent to connector pins. Use Value: Clamps ±15 kV contact ESD without distorting high-speed USB 2.0 data signals or disrupting CC logic state detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-M3/5A | Same electrical specs and AEC-Q101 qualification; halogen-free molding compound (HM3 suffix), whereas SMAJ70CAHE3/5A uses standard RoHS-compliant compound (HE3). | Required where halogen-free compliance is mandated by OEM environmental specifications (e.g., EU auto Tier 1s). | Select SMAJ70CAHE3/5A for general automotive/industrial use; choose SMAJ70CA-M3/5A only if halogen-free certification is contractually required. |
| SMBJ70CAHE3/5A | Identical VWM, VBR, VC, and AEC-Q101 status, but in SMB (DO-214AA) package - 30 % larger footprint (6.2 mm × 4.6 mm) and higher PPPM (600 W). | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger package. | Use SMAJ70CAHE3/5A where space-constrained layouts demand SMA footprint; upgrade to SMBJ70CAHE3/5A only when >400 W surge margin is needed. |
Compared with SMAJ70CA-M3/5A, the SMAJ70CAHE3/5A offers identical protection performance with standard RoHS compliance, while SMBJ70CAHE3/5A provides higher surge capacity in a larger package - making SMAJ70CAHE3/5A the optimal balance of AEC-Q101 reliability, compact size, and cost for mainstream automotive and industrial designs.
Availability
SMAJ70CAHE3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power input protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ70CAHE3/5A 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, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in space-constrained, thermally demanding environments - engineered specifically for automotive, industrial, and telecom applications where surge immunity and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of the SMAJ70CAHE3/5A under a 10/1000 μs surge?
The SMAJ70CAHE3/5A clamps to a maximum of 113 V when subjected to its rated peak pulse current of 3.5 A with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and is guaranteed across the full operating temperature range (–55 °C to +150 °C). The SMAJ70CAHE3/5A achieves this clamping with low dynamic impedance, ensuring predictable protection behavior in real-world surge events.
Is the SMAJ70CAHE3/5A suitable for automotive applications?
Yes, the SMAJ70CAHE3/5A is AEC-Q101 qualified and explicitly intended for automotive use - including engine control modules, body control units, and ADAS sensor interfaces. Its construction includes glass-passivated junctions, matte tin-plated leads compliant with JESD 201 Class 2, and operation up to +150 °C junction temperature. The HE3 suffix confirms RoHS compliance and automotive-grade screening, making SMAJ70CAHE3/5A appropriate for under-hood and cabin applications.
How does the bidirectional nature of the SMAJ70CAHE3/5A affect PCB layout?
The SMAJ70CAHE3/5A has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints. Engineers can place the SMAJ70CAHE3/5A across any two nodes requiring symmetrical overvoltage protection - such as differential signal lines, AC-coupled interfaces, or ungrounded power rails - without verifying anode/cathode alignment. This reduces assembly errors and supports automated optical inspection (AOI) tolerance.
What is the maximum steady-state power dissipation of the SMAJ70CAHE3/5A?
The SMAJ70CAHE3/5A has a maximum steady-state power dissipation (PD) of 3.3 W at 50 °C ambient temperature on an infinite heatsink. In typical PCB layouts using 5.0 mm × 5.0 mm copper pads per terminal, thermal resistance is RθJA = 120 °C/W, limiting continuous DC power to ~0.2 W at 25 °C ambient. The SMAJ70CAHE3/5A is designed for transient, not continuous, power handling - its 400 W rating applies only to short-duration (≤1000 μs) surges.
Does the SMAJ70CAHE3/5A meet industry surge immunity standards?
Yes, the SMAJ70CAHE3/5A supports compliance with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) when implemented with proper PCB layout - including short traces, low-inductance grounding, and adequate copper pour. Its 400 W peak pulse power (10/1000 μs), 113 V clamping voltage, and AEC-Q101 qualification make SMAJ70CAHE3/5A a proven solution for Level 3 and Level 4 surge immunity in automotive and industrial equipment.
SMAJ70CAHE3/5A 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:
- -
- 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)
SMAJ70CAHE3/5A FAQ
1.How can I place an order for SMAJ70CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHE3/5A 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 SMAJ70CAHE3/5A reliable?
The price and inventory of SMAJ70CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHE3/5A?
SMAJ70CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHE3/5A 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 SMAJ70CAHE3/5A?
For technical support, including SMAJ70CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ70CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHE3/5A 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 SMAJ70CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHE3/5A?
All SMAJ70CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHE3/5A, 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 SMAJ70CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ70CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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