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Vishay General Semiconductor - Diodes Division SMAJ8.5AHM3_A/H
- Part No.:
- SMAJ8.5AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHM3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,399
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Product details
Overview
SMAJ8.5AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFET gates, microcontroller I/O, and automotive sensor interfaces.
For engineers reviewing the SMAJ8.5AHM3_A/H datasheet, SMAJ8.5AHM3_A/H pinout, SMAJ8.5AHM3_A/H application, or SMAJ8.5AHM3_A/H equivalent, key selection criteria include verified clamping performance under 10/1000 μs surges, unidirectional polarity marking, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable leakage (<10 μA at VWM) and fast response time (<1 ns), while the SMA package supports automated SMT placement and meets MSL level 1 (260 °C peak reflow).
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold; it sustains 40 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and operates across –55 °C to +150 °C junction temperature range - enabling use in automotive power rail and industrial control input protection where reliability under repetitive transients is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 27.8 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Energy-handling capability under standardized surge waveform; validates robustness against IEC 61000-4-5 Level 3/4. |
| ID (Reverse Leakage) | 10 μA max at VWM - Low standby current preserves battery life and avoids false triggering in low-power sensor nodes. |
| TJ Max | +150 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-indicated by molded band. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (unidirectional) | Connected to lower-potential side (e.g., GND or return path); enables clamping when cathode-side voltage exceeds VBR. |
| Cathode | Avalanche breakdown terminal (marked with band) | Connected to protected line (e.g., 12 V rail or data line); conducts surge current to ground when transient exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control and ADAS power rail protection. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance - supports green manufacturing and long-term supply chain compliance. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to 1 kV/42 Ω without degradation - suitable for CAN bus, LIN, and 12 V power inputs. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - protects 3.3 V and 5 V logic interfaces even with tight VDD tolerances. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking - reduces production complexity and cost in high-volume SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) and ISO 7637-2 pulses on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping within nanoseconds to limit voltage seen by regulator ICs. Use Value: Prevents permanent damage to LDOs and buck controllers during alternator regulation faults - validated per AEC-Q101 stress tests. |
Use Scenario: Protecting analog outputs (4–20 mA) and digital I/O (RS-485, CAN) of PLC modules from field-induced surges. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line, conducting only during >8.5 V transients while remaining invisible during normal operation. Use Value: Maintains <10 μA leakage at 8.5 V, avoiding measurement drift; clamps to 14.4 V to keep transceiver ICs within absolute maximum ratings. |
| Consumer Device USB Port Protection | Automotive Camera Module Power Input |
Use Scenario: Guarding USB VBUS and D+/D− lines against ESD (±15 kV air, ±8 kV contact) and hot-plug surges. IC Role / Device Role / Timing Role: Discrete TVS array (single-device per line) placed adjacent to connector, shunting ESD energy to chassis ground. Use Value: Sub-1 ns response ensures clamping occurs before USB PHY ICs experience latch-up - verified per IEC 61000-4-2 Level 4. |
Use Scenario: Securing 5 V or 12 V power input of rear-view or surround-view camera modules exposed to vehicle electrical noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on camera module's main power rail, coordinated with upstream fuse and downstream LDO. Use Value: Withstands repeated 10/1000 μs surges up to 400 W without parameter shift - critical for ASIL-B functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5AHE3_A/H | Same electrical specs (VWM = 8.5 V, VC = 14.4 V), but RoHS-compliant commercial grade (E3) - not AEC-Q101 qualified. | Lacks automotive qualification; unsuitable for under-hood or safety-critical systems requiring AEC-Q101 evidence. | Select SMAJ8.5AHM3_A/H when halogen-free content and automotive qualification are mandatory; choose E3 version for cost-sensitive consumer designs. |
| SMBJ8.5A-HM3 | Higher 600 W peak pulse power (10/1000 μs), same VWM/VC, but larger SMB (DO-214AA) package - 4.57 mm × 3.94 mm footprint. | Offers higher surge margin but requires PCB layout change; thermal resistance RθJA = 85 °C/W improves power handling. | Choose SMBJ8.5A-HM3 when system-level surge testing exceeds 400 W; retain SMAJ8.5AHM3_A/H for space-constrained layouts where 400 W suffices. |
Compared with SMAJ8.5AHE3_A/H, SMAJ8.5AHM3_A/H adds halogen-free composition and AEC-Q101 validation without altering clamping behavior; versus SMBJ8.5A-HM3, it trades 200 W pulse headroom for 30% smaller board area and compatible reflow profile - making it optimal for compact, automotive-qualified 12 V rail protection.
Availability
SMAJ8.5AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer USB port protection requiring stable component supply, AEC-Q101 traceability, and halogen-free compliance.
Supply support for SMAJ8.5AHM3_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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in automotive, industrial, and computing systems - delivering consistent clamping, low leakage, and robust surge endurance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMAJ8.5AHM3_A/H under a 10/1000 μs surge?
The SMAJ8.5AHM3_A/H has a maximum clamping voltage (VC) of 14.4 V at 27.8 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the highest voltage imposed on the protected circuit during standardized surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The clamping performance is guaranteed across the full operating temperature range.
Is SMAJ8.5AHM3_A/H qualified for automotive applications?
Yes, SMAJ8.5AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including temperature cycling, high-temperature operating life, and ESD - validating its suitability for engine control units, body electronics, and ADAS power rails. The HM3 suffix also denotes halogen-free and RoHS-compliant construction required by Tier 1 automotive suppliers.
What does the "HM3" suffix indicate in SMAJ8.5AHM3_A/H?
The "HM3" suffix in SMAJ8.5AHM3_A/H specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS-compliant commercial grade) and HE3 (AEC-Q101 + RoHS) versions. HM3 devices meet JEDEC J-STD-201 Class 2 whisker resistance and UL 94 V-0 flammability standards - fulfilling environmental and reliability mandates for automotive and industrial deployments where material compliance is audited.
How does SMAJ8.5AHM3_A/H compare to SMAJ8.5AHE3_A/H in terms of electrical performance?
SMAJ8.5AHM3_A/H and SMAJ8.5AHE3_A/H share identical electrical specifications - including VWM = 8.5 V, VBR = 9.44–10.4 V, VC = 14.4 V, and PPPM = 400 W - but differ in qualification and material content. SMAJ8.5AHM3_A/H adds AEC-Q101 validation and halogen-free molding compound, while SMAJ8.5AHE3_A/H is commercial-grade RoHS-compliant only. Both use the same SMA (DO-214AC) package and pinout.
What is the thermal resistance of SMAJ8.5AHM3_A/H, and how does it affect PCB layout?
SMAJ8.5AHM3_A/H has 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. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces effective RθJA and improves surge endurance. For high-duty-cycle applications, designers should verify junction temperature rise using PD = 3.3 W and ambient conditions - especially in sealed automotive enclosures.
SMAJ8.5AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ8.5AHM3_A/H FAQ
1.How can I place an order for SMAJ8.5AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHM3_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 SMAJ8.5AHM3_A/H reliable?
The price and inventory of SMAJ8.5AHM3_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 SMAJ8.5AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHM3_A/H?
SMAJ8.5AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHM3_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 SMAJ8.5AHM3_A/H?
For technical support, including SMAJ8.5AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ8.5AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHM3_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 SMAJ8.5AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHM3_A/H?
All SMAJ8.5AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHM3_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 SMAJ8.5AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ8.5AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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