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Vishay General Semiconductor - Diodes Division SMAJ85CAHM3_A/H
- Part No.:
- SMAJ85CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAHM3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,855
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Product details
Overview
SMAJ85CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ85CAHM3_A/H datasheet, SMAJ85CAHM3_A/H pinout, SMAJ85CAHM3_A/H application, or SMAJ85CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling transient suppression without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for consistent clamping under repetitive ESD or load-switching events.
The SMAJ85CAHM3_A/H is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification confirm suitability for automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 137 V at 2.2 A - Clamped voltage during 10/1000 μs transient, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capacity under standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - Reverse leakage current at 85 V, ensuring minimal standby power loss |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad layout |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current in either direction |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes clamping path to ground or rail |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC-coupled or floating signal lines without polarity constraints |
| 400 W peak pulse power | Handles high-energy transients from inductive switching (e.g., solenoid drivers) without failure |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive environments including temperature cycling, humidity, and mechanical shock |
| MSL Level 1, 260 °C peak | Supports standard lead-free reflow processes without moisture-induced damage |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ps to limit transient overshoot. Use Value: Maintains signal integrity below 137 V clamping level while surviving repeated 400 W surges per AEC-Q101 test conditions. |
Use Scenario: Safeguarding 4–20 mA current-loop inputs in programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff-mode protector that remains non-conductive below 85 V but clamps within nanoseconds when transients exceed VBR. Use Value: Enables robust operation in harsh factory environments with ≤1.0 μA leakage at full VWM, minimizing measurement error. |
| Consumer Power Adapter Output | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage suppression on DC outputs of wall adapters and USB PD chargers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting surge energy away from downstream regulators and USB interface ICs. Use Value: Delivers 137 V clamping at 2.2 A with 120 °C/W thermal resistance, allowing safe dissipation on compact PCB layouts. |
Use Scenario: Protecting Ethernet PHYs and DSL line drivers from induced surges on twisted-pair telecom lines per ITU-T K.21 recommendations. IC Role / Device Role / Timing Role: Symmetrical TVS placed across differential pairs to suppress common-mode transients without disrupting DC bias. Use Value: Bidirectional operation eliminates need for dual unidirectional devices, reducing BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Restricted to commercial-grade automotive modules where halogen-free or full AEC-Q101 compliance is not mandated | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements |
| SMAJ85CAHM3_A/I | Identical electrical and qualification specs; differs only in packaging (13" reel, 7500 pcs vs. 7" reel, 1800 pcs) | No functional difference; suited for high-volume production with extended reel logistics | Choose for large-scale manufacturing runs requiring longer tape lengths and reduced changeover frequency |
Compared with SMAJ85CAHM3_A/H, the HE3 variant trades halogen-free content and AEC-Q101 validation for lower unit cost, while the HM3_A/I offers identical performance in a higher-volume packaging format-enabling optimized procurement without design or layout changes.
Availability
SMAJ85CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line card surge immunity requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ85CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and high-volume manufacturability.
The SMAJ series targets board-level transient protection across automotive, industrial, and consumer markets, with design focus on fast response, repeatable clamping, and SMT process compatibility.
FAQ
What is the clamping voltage of SMAJ85CAHM3_A/H at its rated peak pulse current?
The SMAJ85CAHM3_A/H has a maximum clamping voltage (VC) of 137 V at 2.2 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2.
Is SMAJ85CAHM3_A/H qualified for automotive applications?
Yes, SMAJ85CAHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and explicitly stated in the Vishay datasheet section "Mechanical Data". This qualification covers stress tests including temperature cycling, humidity, and mechanical shock, making SMAJ85CAHM3_A/H suitable for under-hood and cabin electronics.
What does the "CA" suffix signify in SMAJ85CAHM3_A/H?
The "CA" suffix in SMAJ85CAHM3_A/H denotes bidirectional functionality - meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SMAJ85A), SMAJ85CAHM3_A/H has no cathode marking and is used where polarity of transient stress is undefined or alternating.
What is the thermal resistance of SMAJ85CAHM3_A/H under standard mounting conditions?
The SMAJ85CAHM3_A/H exhibits a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet page 3. This value assumes standard FR-4 PCB layout and governs allowable power dissipation in continuous operation.
How does the HM3 suffix differ from E3 or HE3 in the SMAJ85CAHM3_A/H part number?
The "HM3" suffix indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. In contrast, "E3" is RoHS-compliant but not halogen-free or automotive-qualified, and "HE3" adds AEC-Q101 qualification without halogen-free content. All share identical electrical parameters, but SMAJ85CAHM3_A/H uniquely satisfies strict automotive material and reliability standards.
SMAJ85CAHM3_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:
- 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_A/H FAQ
1.How can I place an order for SMAJ85CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAHM3_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 SMAJ85CAHM3_A/H reliable?
The price and inventory of SMAJ85CAHM3_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 SMAJ85CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ85CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAHM3_A/H?
SMAJ85CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAHM3_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 SMAJ85CAHM3_A/H?
For technical support, including SMAJ85CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ85CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAHM3_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 SMAJ85CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ85CAHM3_A/H?
All SMAJ85CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAHM3_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 SMAJ85CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ85CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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