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Vishay General Semiconductor - Diodes Division SMAJ85CAHM3/H
- Part No.:
- SMAJ85CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAHM3/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,784
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Product details
Overview
SMAJ85CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features 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 (10/1000 μs waveform). It is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive electronics.
For engineers reviewing the SMAJ85CAHM3/H datasheet, SMAJ85CAHM3/H pinout, SMAJ85CAHM3/H application, or SMAJ85CAHM3/H equivalent, this device is selected for high-reliability overvoltage protection in automotive sensor interfaces, industrial I/O ports, and telecom line receivers where bidirectional clamping, fast response (<1 ns), and stable thermal performance up to +150 °C junction temperature are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (94.4 V / 104 V), ID ≤ 1.0 μA at VWM, and VC = 137 V under 2.2 A IPPM - enabling consistent clamping during positive/negative transients. Its low RθJA of 120 °C/W and RθJL of 30 °C/W support reliable operation on standard PCB copper pads without heatsinking.
The device uses a glass-passivated silicon junction and meets MSL Level 1 per J-STD-020 (peak reflow 260 °C). Its 0.064 g unit weight and DO-214AC outline ensure compatibility with automated SMT placement and IPC-7351 compliant footprints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal margin. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during surges. |
| VC @ IPPM | 137 V at IPPM = 2.2 A (10/1000 μs) - Clamped voltage seen by protected circuit; limits stress on downstream ICs. |
| PPPM | 400 W - Peak transient energy absorption capability; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3. |
| ID @ VWM | ≤ 1.0 μA - Ultra-low leakage preserves signal integrity and battery life in always-on circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - Standard surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with JEDEC MS-013. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1, 260 °C peak reflow. Bidirectional construction means no polarity marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve as bidirectional clamping nodes; no cathode band marking; layout requires equal trace impedance to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential lines (e.g., RS-485, CAN FD) without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - supports ASIL-B system designs. |
| Halogen-free & RoHS | Meets EU Directive 2011/65/EU and JEDEC JS709C; eliminates brominated flame retardants for safer end-of-life processing. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs surges at 0.01% duty cycle - suitable for frequent load-switching events in motor control modules. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching noise in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground, responding within <1 ns to transients exceeding 85 V. Use Value: Prevents permanent damage to 5 V/3.3 V microcontrollers and ADC front-ends while maintaining signal fidelity below VWM. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field devices subject to relay contact bounce and solenoid back-EMF. IC Role / Device Role / Timing Role: Standoff protector mounted directly at connector entry point, shunting surge energy before it reaches optocoupler or level-shifter ICs. Use Value: Eliminates need for external series resistance or RC filtering, preserving fast edge rates for 10 kHz+ discrete input signals. |
| Telecom Line Receiver | Consumer USB Port ESD Guard |
|
Use Scenario: Shielding RS-485 transceiver inputs in base station remote units exposed to lightning-induced surges on long outdoor cable runs. IC Role / Device Role / Timing Role: Primary surge limiter in parallel with data lines (A/B), clamping common-mode transients up to ±1 kV (IEC 61000-4-5). Use Value: Maintains signal integrity up to 10 Mbps by limiting clamping voltage to 137 V - well below transceiver absolute maximum ratings. |
Use Scenario: Adding secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 Type-A ports in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 100 pF at VWM) TVS placed after primary polymer PTC, absorbing >8 kV HBM ESD pulses. Use Value: Prevents false disconnects and port lockup during user handling while avoiding signal attenuation at 480 Mbps full-speed data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CAHE3/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free certification. | Acceptable for non-automotive industrial use where halogen-free compliance is not mandated by OEM or regulatory requirement. | Select SMAJ85CAHE3/H when cost sensitivity outweighs halogen-free material requirements. |
| SMBJ85CAHM3 | Higher 600 W PPPM rating, SMB (DO-214AA) package (larger footprint: 6.22 mm × 4.57 mm), same VWM/VBR/VC. | Better suited for higher-energy surge environments (e.g., 48 V industrial buses), but requires PCB layout revision due to larger pad size. | Choose SMBJ85CAHM3 only if system-level testing confirms >400 W surge exposure and board space allows SMB footprint. |
Compared with SMAJ85CAHM3/H, SMAJ85CAHE3/H offers identical performance without halogen-free assurance, while SMBJ85CAHM3 delivers 50 % higher surge capacity at the cost of increased board area and incompatible land pattern - making SMAJ85CAHM3/H optimal for space-constrained AEC-Q101 automotive designs requiring halogen-free compliance.
Availability
SMAJ85CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line receiver circuits requiring stable component supply, long-term lifecycle support, and certified halogen-free materials.
Supply support for SMAJ85CAHM3/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 was engineered for high-volume, high-reliability transient suppression in automotive, industrial, and communications systems - delivering standardized TVS performance in compact, automated-placement-ready packages.
FAQ
What is the clamping voltage of SMAJ85CAHM3/H at its rated peak pulse current?
The SMAJ85CAHM3/H has a maximum clamping voltage (VC) of 137 V when subjected to its specified peak pulse current (IPPM) of 2.2 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88390 and represents the upper limit of voltage imposed on protected circuitry during a worst-case transient event. The SMAJ85CAHM3/H maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is SMAJ85CAHM3/H suitable for automotive applications?
Yes, SMAJ85CAHM3/H is explicitly qualified to AEC-Q101 standards, as confirmed in the "Ordering Information" section of Vishay Document 88390 (footnote 1). Its halogen-free, RoHS-compliant construction, MSL Level 1 rating, and guaranteed operation from –55 °C to +150 °C make it appropriate for under-hood and cabin-mounted automotive ECUs, sensor modules, and infotainment interfaces. The SMAJ85CAHM3/H part number suffix "HM3" denotes halogen-free AEC-Q101 qualification.
How does the bidirectional design of SMAJ85CAHM3/H affect its PCB layout?
The bidirectional design of SMAJ85CAHM3/H eliminates polarity constraints - there is no cathode band marking, and both terminals are functionally identical. This simplifies PCB layout by allowing placement without orientation verification and enabling symmetric routing to ground on differential or AC-coupled lines. However, designers must ensure equal trace length and impedance to both terminals to preserve balanced clamping behavior, especially in high-frequency applications like CAN or RS-485.
What is the maximum leakage current of SMAJ85CAHM3/H at its stand-off voltage?
The SMAJ85CAHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 μA when biased at its rated stand-off voltage (VWM) of 85 V, tested at TA = 25 °C. This ultra-low leakage ensures minimal power loss and signal distortion in always-on or battery-powered systems. Leakage remains within specification across the full operating temperature range, supporting reliable performance in ambient conditions up to +125 °C.
Does SMAJ85CAHM3/H require a heatsink for standard operation?
No, SMAJ85CAHM3/H does not require an external heatsink under typical operating conditions. With a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a steady-state power dissipation rating (PD) of 3.3 W, it safely dissipates heat through standard 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - as defined in the "Maximum Ratings" table of Vishay Document 88390. Thermal performance is validated for continuous operation at TA = 50 °C.
SMAJ85CAHM3/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:
- 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:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ85CAHM3/H FAQ
1.How can I place an order for SMAJ85CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAHM3/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 SMAJ85CAHM3/H reliable?
The price and inventory of SMAJ85CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ85CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAHM3/H?
SMAJ85CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAHM3/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 SMAJ85CAHM3/H?
For technical support, including SMAJ85CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAHM3/H requirements.
6.How does Aetrix verify that SMAJ85CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAHM3/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 SMAJ85CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ85CAHM3/H?
All SMAJ85CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAHM3/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 SMAJ85CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ85CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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