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Vishay General Semiconductor - Diodes Division SMAJ85AHM3_A/I
- Part No.:
- SMAJ85AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85AHM3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,382
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Product details
Overview
SMAJ85AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ85AHM3_A/I datasheet, SMAJ85AHM3_A/I pinout, SMAJ85AHM3_A/I application, or SMAJ85AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and suitability for high-reliability 12 V/24 V DC bus protection where fast response (<1 ns) and stable clamping under repetitive surges are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range (94.4–104 V). Its glass-passivated junction ensures stable leakage performance and robust surge handling up to 40 A IFSM (8.3 ms half-sine).
Thermal design relies on RθJA = 120 °C/W and RθJL = 30 °C/W, requiring minimum 0.2" × 0.2" copper pads per terminal for rated 400 W pulse dissipation. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 72–85 V DC systems. |
| VBR (Breakdown Voltage) | 94.4–104 V at 1 mA - Avalanche conduction onset range; ensures reliable triggering above system nominal voltage with margin. |
| VC (Clamping Voltage) | 137 V at IPPM = 2.2 A - Peak voltage seen by protected circuit during 10/1000 μs transient; limits stress on downstream 150 V-rated components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Sustained transient energy absorption capability; derates to 300 W above 78 V per spec. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Ultra-low leakage preserves efficiency in battery-backed or low-power sensor circuits. |
| TJ max. | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential rail; forms return path during clamping event. |
| Cathode | Reverse voltage sensing / clamping node | Connected to protected line (e.g., 12 V supply rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; supports PPAP documentation. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL Level 1 (260 °C peak reflow), enabling lead-free assembly without thermal degradation risk. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (load dump suppression) in 12 V vehicle networks. |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog circuitry sustains damage; critical for protecting CAN transceivers and microcontrollers. |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt events; improves clamping precision versus higher-Rsurge alternatives. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails feeding ECUs, body control modules, and lighting drivers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤137 V, preventing overvoltage failure of 150 V-rated input capacitors and MOSFETs. |
Use Scenario: Safeguarding analog front-ends of pressure, temperature, and position sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) TVS placed across sensor signal pair (e.g., 4–20 mA loop) and shield ground. Use Value: Suppresses EFT bursts (IEC 61000-4-4) and ESD (IEC 61000-4-2) without degrading signal integrity or introducing offset error. |
| Telecom DC Power Input | Consumer Device USB/Power Port |
|
Use Scenario: Input-stage surge protection for PoE-powered switches, base stations, and remote radio units operating from -48 V DC supplies. IC Role / Device Role / Timing Role: Reverse-biased TVS on primary DC input, coordinated with upstream fuse and common-mode choke. Use Value: Absorbs 400 W pulses from lightning-induced surges (IEC 61000-4-5) while maintaining <1 μA leakage at -48 V nominal. |
Use Scenario: Overvoltage guard on 5 V USB VBUS lines in portable speakers, smart home hubs, and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between upstream power source and USB controller VBUS pin. Use Value: Clamps hot-plug overshoot and adapter transients to <137 V, ensuring compatibility with 20 V-rated USB PD controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85AHE3_A/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use only; excludes automotive qualification requirements (e.g., HTOL, TCT). | Select SMAJ85AHE3_A/I for cost-sensitive non-automotive designs where halogen-free is not mandated. |
| SMBJ85A-HM3 | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - larger footprint, higher thermal mass (RθJA = 85 °C/W), 600 W PPPM rating. | Better suited for high-energy transients where PCB space allows; requires different pad layout and may exceed height constraints. | Choose SMBJ85A-HM3 when higher pulse power headroom or improved thermal performance is needed and board real estate permits. |
Compared with SMAJ85AHM3_A/I, SMAJ85AHE3_A/I lacks automotive qualification and halogen-free status, while SMBJ85A-HM3 offers higher pulse power and thermal capability in a physically larger package - making SMAJ85AHM3_A/I the optimal balance of AEC-Q101 compliance, compact SMA footprint, and 400 W protection for space-constrained automotive modules.
Availability
SMAJ85AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC input stages, and consumer USB/Power port designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ85AHM3_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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series delivers standardized, high-surge-capability TVS diodes optimized for board-level protection in automotive, industrial, and communications equipment where AEC-Q101 qualification and halogen-free compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ85AHM3_A/I at its rated peak pulse current?
The SMAJ85AHM3_A/I has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 2.2 A, measured using the standard 10/1000 μs waveform. This value ensures protected downstream components rated for 150 V or higher remain within safe operating limits during transient events. The clamping performance is guaranteed across the full operating temperature range of –55 °C to +150 °C.
Is SMAJ85AHM3_A/I qualified for automotive applications?
Yes, SMAJ85AHM3_A/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and electrostatic discharge (ESD), making it suitable for under-hood and chassis-mounted automotive electronics. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C.
How does the HM3 suffix differ from E3 in Vishay's SMAJ series?
The HM3 suffix on SMAJ85AHM3_A/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification, whereas the E3 suffix (e.g., SMAJ85AHE3_A/I) denotes RoHS compliance only - without halogen-free certification or automotive qualification. Both meet JESD 201 Class 2 whisker resistance, but HM3 is required for automotive PPAP submissions and strict environmental compliance programs.
What is the reverse leakage current of SMAJ85AHM3_A/I at its 85 V stand-off voltage?
The SMAJ85AHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 85 V and TA = 25 °C. This ultra-low leakage preserves power efficiency in always-on systems such as automotive body controllers and battery-supplied IoT sensors, and remains stable across its full operating temperature range.
Can SMAJ85AHM3_A/I be used in bidirectional protection circuits?
No, SMAJ85AHM3_A/I is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. For bidirectional protection - such as AC line inputs or differential data lines - a part with "CA" suffix (e.g., SMAJ85CAHM3_A/I) must be selected. Using SMAJ85AHM3_A/I in reverse-biased configurations risks permanent forward conduction and failure.
SMAJ85AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ85AHM3_A/I FAQ
1.How can I place an order for SMAJ85AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85AHM3_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 SMAJ85AHM3_A/I reliable?
The price and inventory of SMAJ85AHM3_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 SMAJ85AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ85AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85AHM3_A/I?
SMAJ85AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85AHM3_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 SMAJ85AHM3_A/I?
For technical support, including SMAJ85AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ85AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ85AHM3_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 SMAJ85AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ85AHM3_A/I?
All SMAJ85AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85AHM3_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 SMAJ85AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ85AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85AHM3_A/I Tags
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