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Vishay General Semiconductor - Diodes Division SMAJ8.5CAHM3/I
- Part No.:
- SMAJ8.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CAHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,962
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Product details
Overview
SMAJ8.5CAHM3/I 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 signal or power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤14.4 V at 27.8 A peak pulse current (IPPM) under 10/1000 μs waveform - used in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the SMAJ8.5CAHM3/I datasheet, SMAJ8.5CAHM3/I pinout, SMAJ8.5CAHM3/I application, or SMAJ8.5CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 400 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.45), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. It responds within <1 ps to transient overvoltages and maintains stable clamping across -55 °C to +150 °C junction temperature range.
Designed for repetitive surge suppression, it delivers 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that threshold. Its glass-passivated junction ensures low leakage (<10 μA at VWM) and high reliability in harsh environments including automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - voltage at which device enters avalanche conduction; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤14.4 V at IPPM = 27.8 A - peak voltage seen by protected circuit during worst-case surge; enables robust IC-level protection |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for standard lightning/surge waveforms; supports IEC 61000-4-5 Level 3 compliance |
| ID (Reverse Leakage) | ≤10 μA at VWM - minimal standby current draw; avoids loading sensitive analog or low-power circuits |
| TJ max. | +150 °C - extended thermal capability enabling use in engine control units and industrial motor drives without derating |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design; compatible with automated SMT assembly |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-020 MSL level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | For bidirectional operation, functions identically to cathode under reverse polarity; no polarity marking on device body |
| Cathode | Current exit terminal in forward bias | Electrically symmetric with anode; both terminals behave identically during transient clamping events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ADAS sensors and body control modules |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance - eliminates solder joint degradation risk in long-life systems |
| 400 W peak pulse power (≤78 V) | Supports robust protection against ISO 7637-2 pulse 1/2a/5a and IEC 61000-4-5 surges without external heat sinking |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream components - critical for 3.3 V and 5 V logic interface protection |
| Fast response time (<1 ps) | Engages before transient energy couples into protected circuitry - prevents latch-up or gate oxide damage in MOSFETs and microcontrollers |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and LIN nodes from load dump and inductive switching spikes in vehicle chassis electronics. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to limit transient excursions. Use Value: Enables reliable operation of automotive-grade MCUs and transceivers under ISO 16750-2 conditions without additional filtering or layout complexity. |
Use Scenario: Safeguarding PLC digital input modules from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standoff/clamp TVS connected between channel and ground to absorb fast-rising transients from solenoid or relay coil switching. Use Value: Prevents false triggering and component failure in 24 V DC input circuits while maintaining signal integrity during normal operation. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
|
Use Scenario: Secondary-side surge suppression on USB-C PD adapter output rails exposed to ESD and hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed across VBUS/GND to suppress contact discharge and system-level surges. Use Value: Maintains USB PD communication integrity while meeting IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) requirements. |
Use Scenario: Front-end protection of Ethernet PHY interfaces in enterprise switches subjected to lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Common-mode TVS array element used in conjunction with GDTs and common-mode chokes for balanced line protection. Use Value: Limits induced common-mode voltages to safe levels for 10/100/1000BASE-T transceivers without degrading signal rise/fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CAHE3/I | Same electrical specs but RoHS-compliant (E3), non-halogen-free; lacks JESD201 Class 2 whisker resistance | Suitable for commercial/industrial use where halogen-free requirement is not mandated | Select when cost sensitivity outweighs automotive or long-life reliability needs |
| SMBJ8.5CAHM3/I | Same VWM/VBR/VC ratings but SMB (DO-214AA) package - 25 % larger footprint and 600 W PPPM rating | Better suited for higher-energy surge environments (e.g., AC mains input stages) | Choose when board space allows and higher surge margin is required beyond 400 W |
Compared with SMAJ8.5CAHM3/I, the HE3 variant trades halogen-free compliance for lower cost in non-automotive settings, while the SMBJ8.5CAHM3/I offers greater surge handling at the expense of PCB area - making SMAJ8.5CAHM3/I optimal for space-constrained AEC-Q101 designs needing precise 400 W clamping.
Availability
SMAJ8.5CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and consumer power adapter safety requiring stable component supply across multi-year production cycles.
Supply support for SMAJ8.5CAHM3/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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMAJ series targets compact, high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for AEC-Q101 compliance, low clamping voltage, and seamless SMT integration.
FAQ
What does the 'HM3' suffix indicate in SMAJ8.5CAHM3/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance and AEC-Q101 qualification. This makes SMAJ8.5CAHM3/I suitable for automotive and long-lifecycle industrial applications where material compliance and intermetallic reliability are mandatory. The 'I' indicates 13-inch tape-and-reel packaging (7500 units per reel).
Is SMAJ8.5CAHM3/I unidirectional or bidirectional?
SMAJ8.5CAHM3/I is a bidirectional TVS diode, as confirmed by the 'CA' designation in its part number. It provides symmetrical clamping in both polarities - essential for protecting AC-coupled signal lines, differential buses like CAN, and floating power domains where polarity reversal may occur during transients.
What is the maximum clamping voltage of SMAJ8.5CAHM3/I at rated surge current?
The maximum clamping voltage (VC) of SMAJ8.5CAHM3/I is 14.4 V at 27.8 A peak pulse current (IPPM), measured using the standard 10/1000 μs waveform. This value ensures protected circuits remain within safe operating limits even during worst-case surge events defined by IEC 61000-4-5 and ISO 7637-2.
Can SMAJ8.5CAHM3/I replace SMAJ8.5A in a design?
No - SMAJ8.5A is unidirectional and lacks the symmetrical clamping behavior of SMAJ8.5CAHM3/I. Substituting SMAJ8.5CAHM3/I for SMAJ8.5A would introduce unnecessary conduction paths in DC-biased circuits and may compromise protection effectiveness. Always match directionality (A vs. CA) and qualification grade (HM3 vs. E3/M3) when selecting replacements.
What thermal derating applies to SMAJ8.5CAHM3/I above 25 °C ambient?
SMAJ8.5CAHM3/I follows standard derating per Figure 2 in the datasheet: its peak pulse power decreases linearly above 25 °C ambient, reaching ~75 % of rated 400 W at 75 °C and zero at 150 °C junction temperature. Designers must ensure PCB copper pad layout (0.2" × 0.2" per terminal) and system airflow maintain TJ ≤ 150 °C under worst-case surge repetition.
SMAJ8.5CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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)
SMAJ8.5CAHM3/I FAQ
1.How can I place an order for SMAJ8.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/I reliable?
The price and inventory of SMAJ8.5CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CAHM3/I?
SMAJ8.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/I?
For technical support, including SMAJ8.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CAHM3/I requirements.
6.How does Aetrix verify that SMAJ8.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CAHM3/I?
All SMAJ8.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ8.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CAHM3/I Tags
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