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Vishay General Semiconductor - Diodes Division SMAJ85CAHE3_A/I
- Part No.:
- SMAJ85CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAHE3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,262
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Product details
Overview
SMAJ85CAHE3_A/I 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 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 on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ85CAHE3_A/I datasheet, SMAJ85CAHE3_A/I pinout, SMAJ85CAHE3_A/I application, or SMAJ85CAHE3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 85 V), then rapidly switches to low-impedance conduction when transients exceed VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability across -55 °C to +150 °C operating range.
The device meets MSL Level 1 per J-STD-020, supports lead-free reflow up to 260 °C peak, and delivers consistent clamping performance independent of polarity - critical for protecting bidirectional data lines (e.g., CAN, LIN) and AC-coupled analog inputs where voltage excursions occur in both directions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 94.4–104 V at 1 mA - precise voltage threshold triggering clamping action; tight tolerance enables predictable protection timing. |
| VC (Clamping Voltage) | 137 V at IPPM = 2.2 A - peak voltage seen by protected circuit during surge; determines stress level on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for single transients; derates to 300 W above 78 V per spec. |
| ID (Reverse Leakage) | 1.0 μA max at 85 V - negligible standby power loss and minimal signal interference in high-impedance circuits. |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals simplify layout and eliminate orientation errors during assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically; surge current flows bidirectionally between them without polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware routing on differential or AC-coupled lines. |
| AEC-Q101 qualification | Validated for automotive electronics - assures long-term reliability under thermal shock, humidity, and vibration stress. |
| Low RθJL (30 °C/W) | Enables efficient heat transfer to PCB copper pads - sustains repetitive surge capability without thermal runaway. |
| MSL Level 1 rating | Zero floor life limitation - can be stored indefinitely before reflow; compatible with standard SMT assembly processes. |
| Glass-passivated junction | Stable electrical parameters over time and temperature - prevents parameter drift in harsh industrial environments. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Channel |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver pins from load-dump and inductive switching transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp surges before reaching silicon. Use Value: Withstands 400 W pulses while limiting voltage to ≤137 V - prevents latch-up or gate oxide damage in AEC-Q100 qualified MCUs. |
Use Scenario: Shields 4–20 mA current-loop receiver circuitry from EFT bursts and field-wiring induced spikes in factory automation. IC Role / Device Role / Timing Role: Bidirectional clamping element across input terminals to absorb ±1 kV EFT events per IEC 61000-4-4. Use Value: Symmetrical response ensures equal protection against positive and negative transients - critical for bipolar analog front-ends. |
| Telecom Power Supply Input | Consumer Appliance Motor Driver Interface |
Use Scenario: Guards primary-side DC bus (e.g., 48 V telecom rectifier output) against lightning-induced surges entering via external cabling. IC Role / Device Role / Timing Role: First-line overvoltage clamp upstream of DC-DC converters and PMICs. Use Value: 137 V clamping at 2.2 A enables coordination with downstream OVP circuits - avoids false triggering while ensuring safe rail collapse. |
Use Scenario: Safeguards H-bridge gate drivers and current-sense amplifiers from back-EMF spikes generated by brushed DC motors in white goods. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor connector to minimize inductive loop area. Use Value: Fast response (<1 ps) and low clamping voltage reduce voltage overshoot on driver ICs - extends MOSFET lifetime and prevents shoot-through. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CAHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose SMAJ85CAHM3_A/I if halogen-free construction is required; otherwise SMAJ85CAHE3_A/I offers standard RoHS compliance. |
| SMBJ85CAHE3_A/I | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 27% larger footprint and higher thermal mass (RθJA = 85 °C/W vs. 120 °C/W). | Better sustained surge handling due to higher thermal inertia; suited for infrequent but high-energy transients in non-space-constrained designs. | Select SMBJ85CAHE3_A/I only when board space permits and higher thermal budget justifies larger footprint; SMAJ85CAHE3_A/I optimizes density and cost. |
Compared with SMAJ85CAHM3_A/I, the SMAJ85CAHE3_A/I offers identical protection performance with standard RoHS compliance; versus SMBJ85CAHE3_A/I, it trades thermal robustness for compact size and lower cost - ideal for space-limited automotive and industrial modules.
Availability
SMAJ85CAHE3_A/I is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC analog inputs, and telecom power supply protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ85CAHE3_A/I 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-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for fast response, repeatable clamping, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMAJ85CAHE3_A/I at its rated peak pulse current?
The SMAJ85CAHE3_A/I has a maximum clamping voltage (VC) of 137 V at a peak pulse current (IPPM) of 2.2 A, measured using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2. The SMAJ85CAHE3_A/I maintains this clamping performance bidirectionally.
Is SMAJ85CAHE3_A/I qualified for automotive applications?
Yes, SMAJ85CAHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number and confirmed in the Vishay datasheet section "MECHANICAL DATA". This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD - making SMAJ85CAHE3_A/I suitable for under-hood and cabin electronics in passenger vehicles and commercial vehicles.
What package type does SMAJ85CAHE3_A/I use, and what are its key mechanical features?
SMAJ85CAHE3_A/I uses the SMA (DO-214AC) surface-mount package - measuring 4.93 mm × 3.99 mm × 2.29 mm with matte tin-plated leads. It meets UL 94 V-0 flammability rating, supports MSL Level 1 handling, and is rated for peak reflow temperatures up to 260 °C. The SMAJ85CAHE3_A/I has no polarity marking due to its bidirectional design, simplifying placement accuracy.
How does the bidirectional nature of SMAJ85CAHE3_A/I affect its circuit implementation?
The bidirectional configuration of SMAJ85CAHE3_A/I means it provides symmetrical clamping in both polarities - no cathode/anode orientation is required during PCB layout. This allows direct placement across AC-coupled lines, differential buses (e.g., CAN, RS-485), or ungrounded power rails without risk of reverse connection. The SMAJ85CAHE3_A/I achieves identical VBR and VC values in either direction, as verified in the "ELECTRICAL CHARACTERISTICS" table.
What is the maximum operating junction temperature for SMAJ85CAHE3_A/I, and how does it impact thermal design?
The SMAJ85CAHE3_A/I has a maximum junction temperature (TJ max.) of +150 °C, enabling reliable operation in high-ambient environments such as engine compartments or sealed industrial enclosures. Its thermal resistance from junction to lead (RθJL) is 30 °C/W, meaning effective heat sinking to PCB copper pads is essential - especially under repetitive surge conditions. Designers must follow the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) pad layout to maintain SMAJ85CAHE3_A/I performance.
SMAJ85CAHE3_A/I 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/I FAQ
1.How can I place an order for SMAJ85CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAHE3_A/I 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/I reliable?
The price and inventory of SMAJ85CAHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMAJ85CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAHE3_A/I?
SMAJ85CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAHE3_A/I 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/I?
For technical support, including SMAJ85CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ85CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMAJ85CAHE3_A/I?
All SMAJ85CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMAJ85CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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