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Vishay General Semiconductor - Diodes Division SMAJ85CAHE3/5A
- Part No.:
- SMAJ85CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAHE3/5A.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,582
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Product details
Overview
SMAJ85CAHE3/5A 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 stand-off 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 (IPPM), 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 SMAJ85CAHE3/5A datasheet, SMAJ85CAHE3/5A pinout, SMAJ85CAHE3/5A application, or SMAJ85CAHE3/5A equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, clamping performance under surge conditions, thermal resistance data, and direct alternatives for ESD/lightning transient protection in 12 V/24 V systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low leakage (<1 μA at VWM), while the low incremental surge resistance supports fast energy dissipation during 8/20 μs or 10/1000 μs surges.
The device is rated for 150 °C max junction temperature and exhibits RθJA = 120 °C/W (typical), requiring minimal PCB copper area for thermal management. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 - confirming suitability for automotive under-hood and infotainment applications where reliability under thermal cycling and humidity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - tight breakdown window ensures predictable turn-on and avoids false triggering near system rail. |
| VC @ IPPM | 137 V at IPPM = 2.2 A - clamping voltage limits downstream IC stress during IEC 61000-4-5 surge events. |
| PPPM | 400 W (10/1000 μs) - handles repetitive transients up to 0.01 % duty cycle; derates to 300 W above 78 V. |
| ID @ VWM | <1 μA - ultra-low leakage preserves battery life and prevents signal integrity degradation in high-impedance sensor paths. |
| TJ max | +150 °C - enables operation in engine bay or industrial enclosures without derating in ambient up to +125 °C. |
| RθJA | 120 °C/W - requires only 0.2" × 0.2" (5 mm × 5 mm) copper pads per terminal for thermal compliance at full power. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; RoHS-compliant and halogen-free; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative surges; symmetrical with cathode - no functional distinction in bidirectional mode. |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive surges; identical electrical behavior to anode due to CA suffix design. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control modules. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV line-to-earth) surges on 24 V supply rails without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during fast transients - critical for protecting 100 V-rated MOSFETs and CAN transceivers. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no pre-baking required prior to assembly. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal stress and humidity exposure. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs of engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and ground to shunt surge energy before it reaches DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤137 V, preventing latch-up or gate oxide damage in downstream 36 V-rated power management ICs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and return path to absorb sub-100 ns ESD pulses without distorting slow analog signals. Use Value: Sub-1 μA leakage at 85 V ensures <0.1 % error in precision current loop accuracy; clamps 8 kV contact ESD to <200 V. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Protection |
|
Use Scenario: Safeguarding Ethernet PHY power pins (e.g., PoE midspan injectors) from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input rail, coordinated with secondary GDT or MOV for staged surge handling. Use Value: 400 W rating sustains multiple 10/1000 μs surges up to 1 kV; bidirectional symmetry eliminates need for polarity-aware layout. |
Use Scenario: Adding secondary-side overvoltage protection on 12 V outputs of wall adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Final-stage clamp after DC/DC regulation, absorbing residual switching spikes and external coupling transients. Use Value: 137 V clamping protects 16 V-rated USB-PD controllers and PMICs; RoHS/halogen-free construction meets global regulatory requirements. |
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-M3/5A | Same electrical specs and AEC-Q101 qualification; halogen-free variant (no brominated flame retardants). | Required for strict environmental compliance in EU medical or consumer devices with halogen bans. | Select when halogen-free material compliance is mandated by end-product safety certification. |
| SMBJ85CAHE3/5A | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher PPPM (600 W) and lower RθJA (80 °C/W). | Better suited for high-reliability industrial power supplies where board space allows and thermal margin is critical. | Choose when 600 W surge handling or improved thermal performance justifies larger footprint and cost premium. |
Compared with SMAJ85CAHE3/5A, the SMAJ85CA-M3/5A offers identical protection performance with halogen-free materials, while the SMBJ85CAHE3/5A provides 50 % higher surge power and 33 % lower thermal resistance - making it preferable for thermally constrained or high-energy transient environments.
Availability
SMAJ85CAHE3/5A is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor nodes, telecom line interfaces, and consumer power adapter protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ85CAHE3/5A 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and automotive-grade validation.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ85CAHE3/5A at its rated peak pulse current?
The SMAJ85CAHE3/5A has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 2.2 A, measured using the 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components see limited overvoltage during standardized surge events. The SMAJ85CAHE3/5A maintains this clamping performance due to its low incremental surge resistance and symmetric bidirectional structure.
Is SMAJ85CAHE3/5A qualified for automotive applications?
Yes, SMAJ85CAHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" - indicating RoHS-compliant and automotive-grade qualification. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life, making it suitable for engine control units, body electronics, and ADAS subsystems. The SMAJ85CAHE3/5A meets all requirements for under-hood deployment up to +125 °C ambient.
How does the bidirectional configuration of SMAJ85CAHE3/5A affect PCB layout?
The SMAJ85CAHE3/5A has no polarity marking and functions identically in both directions, eliminating orientation constraints during automated placement. Unlike unidirectional TVS diodes, it requires no cathode band alignment - reducing assembly errors and enabling simplified two-pad layout. This symmetry also avoids the need for duplicate components on differential lines, and the SMAJ85CAHE3/5A's DO-214AC footprint remains compatible with standard SMA pick-and-place tooling.
What is the maximum leakage current of SMAJ85CAHE3/5A at its stand-off voltage?
The SMAJ85CAHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 85 V stand-off voltage (VWM), tested at 25 °C. This ultra-low leakage preserves system efficiency in battery-powered applications and prevents loading errors in high-impedance sensor circuits. The SMAJ85CAHE3/5A maintains leakage below 5 μA even at +85 °C, supporting reliable operation in extended temperature environments.
Can SMAJ85CAHE3/5A be used in place of a unidirectional TVS like SMAJ85AHE3/5A?
No - SMAJ85CAHE3/5A is strictly bidirectional and cannot replace unidirectional types such as SMAJ85AHE3/5A in circuits requiring forward conduction or DC blocking in one direction only. While both share identical VWM and clamping specs, the SMAJ85CAHE3/5A lacks polarity-dependent functionality and will conduct during forward bias. Use SMAJ85CAHE3/5A only where symmetrical transient suppression is needed, such as AC-coupled lines or floating power domains.
SMAJ85CAHE3/5A 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):
- 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)
SMAJ85CAHE3/5A FAQ
1.How can I place an order for SMAJ85CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAHE3/5A 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 SMAJ85CAHE3/5A reliable?
The price and inventory of SMAJ85CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ85CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAHE3/5A?
SMAJ85CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAHE3/5A 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 SMAJ85CAHE3/5A?
For technical support, including SMAJ85CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ85CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAHE3/5A 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 SMAJ85CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ85CAHE3/5A?
All SMAJ85CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAHE3/5A, 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 SMAJ85CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ85CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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