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Vishay General Semiconductor - Diodes Division SMAJ70CAHE3_A/H
- Part No.:
- SMAJ70CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHE3_A/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,183
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Product details
Overview
SMAJ70CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 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 - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ70CAHE3_A/H datasheet, SMAJ70CAHE3_A/H pinout, SMAJ70CAHE3_A/H application, or SMAJ70CAHE3_A/H equivalent, this part is selected for bidirectional surge suppression where AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), and MSL Level 1 reflow compatibility are required in harsh-environment designs.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 70 V), while the SMA package supports automated SMT placement and meets UL 94 V-0 flammability requirements.
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It is rated for operating junction temperatures from –55 °C to +150 °C and qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range on protected line. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 113 V at 3.5 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capacity; defines survivability against ISO 7637-2 Pulse 1/2a/5a events. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at standoff voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard reflow profiles (peak 260 °C). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant, no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | One terminal of symmetrical PN junction; connects to protected line (e.g., CAN_H or RS-485 A); no cathode band marking. |
| Cathode | Transient return path (bidirectional) | Second terminal of symmetrical PN junction; connects to same protected line (e.g., CAN_H or RS-485 A); functionally identical to Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock per JESD22 standards. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump (ISO 16750-2) and inductive switching spikes without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing stress on 75 V-rated components like automotive microcontrollers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
| Glass passivated junction | Ensures stable VBR over time and temperature, with <1.0 μA leakage at VWM - critical for precision analog front-ends. |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across VBAT input prior to DC-DC converter input stage. Use Value: Limits transient voltage to ≤113 V, preventing damage to 75 V-rated input MOSFETs and maintaining system uptime during engine cranking. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to ESD and cable-induced surges. IC Role / Device Role / Timing Role: Differential-line TVS connected between A/B bus lines and ground, leveraging bidirectional symmetry. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) and 4 kV lightning-induced surges (IEC 61000-4-5) without signal distortion or latch-up. |
| Consumer USB-C Port Surge Suppression | Telecom DSL Line Transient Protection |
|
Use Scenario: Adding secondary surge protection on USB-C VBUS lines in portable docking stations subjected to hot-plug transients. IC Role / Device Role / Timing Role: Standoff-limited TVS placed after primary fuse and upstream of USB PD controller. Use Value: Blocks >70 V transients while maintaining <1.0 μA leakage - preserving low-power suspend mode current budgets. |
Use Scenario: Front-end protection of ADSL/VDSL line interface ICs against induced surges from nearby AC power lines or lightning coupling. IC Role / Device Role / Timing Role: Bidirectional clamp across tip/ring pair, referenced to telecom ground with minimal parasitic capacitance. Use Value: Provides 113 V clamping with <10 pF junction capacitance (typ.) - avoids signal attenuation in 30 MHz DSL bands. |
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-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No difference in circuit performance or layout; differs only in material compliance (halogen-free molding compound). | Select when halogen-free BOM compliance is mandated by OEM or regional environmental regulations. |
| SMBJ70CAHE3_A/H | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 20 % larger footprint, 50 % higher thermal mass. | Higher 600 W peak pulse power rating; better suited for sustained surge duty cycles or higher ambient temperatures. | Choose when thermal margin is critical and PCB space allows larger SMB footprint; not drop-in compatible. |
Compared with SMAJ70CAHE3_A/H, the SMAJ70CA-M3/61 offers identical protection performance with halogen-free materials, while the SMBJ70CAHE3_A/H provides higher surge endurance at the cost of board area - making the SMAJ70CAHE3_A/H optimal for space-constrained AEC-Q101 automotive modules.
Availability
SMAJ70CAHE3_A/H is available at Aetrix Electronics and suitable for automotive control units, industrial communication interfaces, consumer power delivery systems, and telecom line cards requiring stable component supply across extended production lifecycles.
Supply support for SMAJ70CAHE3_A/H 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 is engineered for high-reliability transient suppression in automotive, industrial, and communications infrastructure - delivering consistent clamping performance under repetitive surge stress and extreme temperature conditions.
FAQ
What does the "CA" suffix indicate in SMAJ70CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMAJ70CAHE3_A/H contains two opposing avalanche diodes in series, enabling symmetrical clamping for both positive and negative transients. This eliminates polarity concerns during PCB layout and supports differential-line protection such as CAN bus or RS-485, unlike unidirectional "A" variants which require correct cathode orientation.
Is SMAJ70CAHE3_A/H suitable for ISO 16750-2 load dump protection?
SMAJ70CAHE3_A/H is rated for 400 W peak pulse power with a 10/1000 μs waveform and clamps to 113 V at 3.5 A - sufficient for ISO 16750-2 Pulse 5a (load dump) in 12 V systems when used with appropriate series impedance. Its AEC-Q101 qualification confirms validation for automotive electrical environments, including temperature cycling and vibration stress.
What is the junction capacitance of SMAJ70CAHE3_A/H, and why does it matter?
The junction capacitance of SMAJ70CAHE3_A/H is typically <10 pF at 0 V (per Vishay's family characterization), critical for high-speed data lines. Low capacitance prevents signal rise-time degradation and jitter in interfaces like USB-C, RS-485, or CAN FD - ensuring integrity of multi-Mbps communication while maintaining robust transient immunity.
How does the HE3 suffix affect the qualification and compliance of SMAJ70CAHE3_A/H?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification - verified for automotive use including temperature cycling, humidity testing, and mechanical shock. This distinguishes it from commercial-grade "E3" parts and ensures long-term reliability in under-hood or chassis-mounted applications where failure modes must meet stringent automotive safety requirements.
Can SMAJ70CAHE3_A/H be used in parallel for higher surge current handling?
No - SMAJ70CAHE3_A/H should not be paralleled without external balancing resistors. Minor VBR tolerances (77.8–86.0 V) cause uneven current sharing during surges, risking thermal runaway in one device. For higher IPPM, select a single higher-rated device (e.g., SMBJ70CAHE3_A/H) or verify matched-bin parts with <1 % VBR spread per manufacturer guidance.
SMAJ70CAHE3_A/H 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/H FAQ
1.How can I place an order for SMAJ70CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHE3_A/H 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/H reliable?
The price and inventory of SMAJ70CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHE3_A/H?
SMAJ70CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHE3_A/H 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/H?
For technical support, including SMAJ70CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ70CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHE3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHE3_A/H?
All SMAJ70CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHE3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ70CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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