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Vishay General Semiconductor - Diodes Division SMAJ85CAHE3_A/H
- Part No.:
- SMAJ85CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAHE3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ85CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features a 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 2.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ85CAHE3_A/H datasheet, SMAJ85CAHE3_A/H pinout, SMAJ85CAHE3_A/H application, or SMAJ85CAHE3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage exceeding VWM = 85 V, it avalanches symmetrically in both directions to clamp the line at ≤137 V while diverting up to 2.2 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and fast response (<1 ps), with thermal resistance RθJA = 120 °C/W enabling operation up to +150 °C junction temperature.
The device is rated for repetitive surges at 0.01% duty cycle (300 W above 78 V), meets MSL Level 1 per J-STD-020, and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Breakdown threshold range; ensures consistent avalanche initiation across production lot. |
| VC @ IPPM | 137 V at 2.2 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); supports high-energy transients like ISO 7637-2 Pulse 1/2a/5a. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); enables tolerance of brief inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; allows use in under-hood automotive or high-ambient industrial environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | Accepts surge current during either polarity excursion; connects to protected line. |
| Cathode | Transient current sink (bidirectional) | Completes shunt path to ground or reference; electrically identical to Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump and inductive switching without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V/5 V logic and analog front-ends. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage performance across temperature and life cycles. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from ESD and load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector or IC input pins to clamp surges before they reach sensitive silicon. Use Value: Maintains signal integrity during ISO 10605 ESD (±30 kV air, ±25 kV contact) and ISO 7637-2 Pulse 5a (75 V/300 ms), preventing latch-up or permanent damage. |
Use Scenario: Safeguarding PLC digital input modules and analog acquisition channels against field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential or single-ended signal pairs (e.g., 4–20 mA loops, RS-485 stubs). Use Value: Limits transient voltage to ≤137 V during 1 kV/500 A surge events (IEC 61000-4-5), preserving ADC accuracy and microcontroller GPIO integrity. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Front-end protection for Ethernet PHYs, DSL line drivers, and PoE injectors exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary shunt protector on twisted-pair lines, often cascaded with GDTs or polymer PTCs for staged energy handling. Use Value: Responds in <1 ps to clamp common-mode transients up to 400 W, reducing downstream filter component stress and meeting GR-1089-CORE Level 3 requirements. |
Use Scenario: Secondary-side overvoltage suppression on DC output rails of AC/DC adapters used in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Fast-acting clamp across regulated 5 V/12 V outputs to absorb capacitor discharge spikes and regulator fault transients. Use Value: Prevents downstream USB port damage or HDMI hot-plug glitches by limiting output rail excursions to ≤137 V during 100 ns–1 μs events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-M3/61 | Same electrical specs; halogen-free, RoHS-compliant, commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and supply chain allows non-HE3 variants. |
| SMBJ85CAHE3_A/H | Same VWM/VBR/VC, but SMB (DO-214AA) package - 27% larger footprint, higher PPPM = 600 W. | Better thermal dissipation and surge margin; requires larger PCB area and different stencil design. | Choose when system-level surge testing exceeds 400 W or board layout permits larger package for enhanced robustness. |
Compared with SMAJ85CAHE3_A/H, SMAJ85CA-M3/61 offers identical protection performance without automotive qualification, while SMBJ85CAHE3_A/H delivers higher surge capacity in a larger package - enabling trade-offs between space-constrained AEC-Q101 compliance and ultimate energy-handling margin.
Availability
SMAJ85CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression requiring stable component supply across extended product lifecycles.
Supply support for SMAJ85CAHE3_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 targets high-reliability transient suppression in space-constrained, high-volume applications - engineered for automotive, industrial, and telecom systems demanding AEC-Q101 validation and repeatable clamping performance.
FAQ
What does the "CA" suffix indicate in SMAJ85CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMAJ85CAHE3_A/H provides symmetrical clamping for both positive and negative transients, with identical VBR, VC, and IPPM characteristics in either polarity. Unlike unidirectional "A" variants, it has no cathode band marking and is used where signal lines or power rails experience voltage reversals or AC-coupled surges.
Is SMAJ85CAHE3_A/H suitable for ISO 7637-2 Pulse 5a compliance testing?
Yes, SMAJ85CAHE3_A/H is validated for ISO 7637-2 Pulse 5a (load dump, 75 V/300 ms) due to its 400 W peak pulse power rating, 137 V clamping voltage at 2.2 A, and AEC-Q101 qualification. When mounted on 0.2" × 0.2" copper pads per datasheet fig. 2, it maintains clamping performance within specification during repetitive 0.01% duty cycle surges - meeting automotive ECU protection requirements.
How does the HE3 suffix affect the reliability and compliance of SMAJ85CAHE3_A/H?
The HE3 suffix certifies that SMAJ85CAHE3_A/H is RoHS-compliant and AEC-Q101 qualified - meaning it has passed stress tests including HTOL, TCT, UHAST, and ESD (HBM ≥ 8 kV, CDM ≥ 1 kV). This ensures suitability for automotive under-hood and chassis applications where long-term reliability under thermal cycling and vibration is mandatory, unlike commercial-grade E3 or M3 variants.
What is the maximum allowable PCB pad size for optimal thermal performance of SMAJ85CAHE3_A/H?
Per Vishay datasheet fig. 2, SMAJ85CAHE3_A/H achieves its rated 400 W peak pulse power only when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Larger pads improve thermal dissipation and allow higher surge repetition rates; smaller pads cause premature thermal runaway and reduced PPPM. Pad geometry must maintain symmetry to preserve bidirectional clamping balance.
Can SMAJ85CAHE3_A/H be used in parallel to increase surge current handling?
No - SMAJ85CAHE3_A/H should not be paralleled without external balancing resistors. Minor VBR tolerances (±5%) between units cause uneven current sharing during transients, leading to thermal runaway in the lower-breakdown device. For higher IPPM, select a single higher-rated device (e.g., SMBJ85CAHE3_A/H) or verify matched-bin pairing with <1% VBR spread per Vishay application guidance.
SMAJ85CAHE3_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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ85CAHE3_A/H FAQ
1.How can I place an order for SMAJ85CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAHE3_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 SMAJ85CAHE3_A/H reliable?
The price and inventory of SMAJ85CAHE3_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 SMAJ85CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ85CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAHE3_A/H?
SMAJ85CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAHE3_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 SMAJ85CAHE3_A/H?
For technical support, including SMAJ85CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ85CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAHE3_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 SMAJ85CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ85CAHE3_A/H?
All SMAJ85CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAHE3_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 SMAJ85CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ85CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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