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Vishay General Semiconductor - Diodes Division SMAJ8.5AHM3/H
- Part No.:
- SMAJ8.5AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHM3/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,636
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Product details
Overview
SMAJ8.5AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping transient overvoltages on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, 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 MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ8.5AHM3/H datasheet, SMAJ8.5AHM3/H pinout, SMAJ8.5AHM3/H application, or SMAJ8.5AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device triggered by reverse-biased avalanche breakdown above its stand-off voltage. Its glass-passivated junction ensures stable VBR tolerance and fast response time (<1 ns), while the SMA package provides thermal resistance of 120 °C/W (junction-to-ambient) and supports 3.3 W steady-state power dissipation at 50 °C ambient.
The SMAJ8.5AHM3/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits 0.073 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across automotive thermal cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal line operating margin. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 14.4 V at 27.8 A - clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure level. |
| PPPM | 400 W - peak transient energy handling capability with standard 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surges. |
| ID @ VWM | 10 μA - maximum reverse leakage at 8.5 V; negligible loading on low-power sensor or logic supply rails. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded end is opposite) | Connected to lower-potential side of protected line; forms reverse-biased junction with cathode during transients. |
| Cathode | Avalanche clamping terminal (marked with band) | Connected to higher-potential rail (e.g., VCC or signal high); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, body electronics, and ADAS power rails. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - meets EU Directive 2011/65/EU and automotive material compliance requirements. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs transients up to 0.01% duty cycle without degradation - protects against load dump and inductive switching events. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during clamping - preserves margin for 12 V systems where protected ICs tolerate ≤16 V absolute maximum. |
| MSL Level 1 moisture sensitivity | Zero floor life limitation; can be stored indefinitely and placed directly into reflow without baking - simplifies SMT line logistics. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VBAT and GND, upstream of LDO input. Use Value: Limits transient voltage to ≤14.4 V during 27.8 A surge, preventing latch-up or gate oxide damage in downstream PMICs and MCUs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and field-induced surges in factory automation sensors. IC Role / Device Role / Timing Role: Reverse-biased TVS connected between signal line and ground, with low leakage preserving loop accuracy. Use Value: 10 μA max reverse leakage at 8.5 V avoids measurement error; 14.4 V clamping prevents op-amp input stage breakdown. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
|
Use Scenario: Secondary-side DC bus protection in USB-C PD adapters subjected to conducted surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Stand-off clamping device on +5 V/9 V/15 V output rails prior to connector interface. Use Value: 400 W rating absorbs multiple 1 kV/500 A surges; SMA footprint allows dense layout near output connectors. |
Use Scenario: Primary protection for Ethernet PHY power pins (e.g., 3.3 V bias) exposed to lightning-induced surges on PoE-enabled line cards. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor tied between PHY VDDIO and chassis ground. Use Value: Sub-1 ns response time captures fast-rising edge of induced surges; AEC-Q101 qualification adds robustness for telecom infrastructure. |
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/H | Same electrical specs, but RoHS-compliant with brominated flame retardant (not halogen-free); lacks HM3 halogen-free certification. | Acceptable for commercial/industrial use where halogen-free materials are not mandated (e.g., non-automotive BOMs). | Select SMAJ8.5AHE3/H only if halogen content is unrestricted and cost is prioritized over automotive compliance. |
| SMBJ8.5A-HM3 | Higher 600 W PPPM rating, SMB (DO-214AA) package - larger footprint, 150 °C TJ max, same VWM/VBR/VC. | Better suited for higher-energy transients (e.g., ISO 16750-2 load dump); requires PCB layout change due to larger pad area. | Choose SMBJ8.5A-HM3 when system-level surge testing exceeds 400 W capability or when thermal margin is constrained. |
Compared with SMAJ8.5AHE3/H, the SMAJ8.5AHM3/H adds halogen-free compliance critical for automotive Tier 1 suppliers; versus SMBJ8.5A-HM3, it trades 200 W pulse power for smaller SMA footprint and identical AEC-Q101 qualification - optimizing space-constrained 12 V rail designs.
Availability
SMAJ8.5AHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer adapter secondary-side surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ8.5AHM3/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, precision, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting 12 V/24 V automotive, industrial control, and telecom infrastructure where AEC-Q101 validation and halogen-free compliance are mandatory.
FAQ
What is the clamping voltage of the SMAJ8.5AHM3/H under a 10/1000 μs surge?
The SMAJ8.5AHM3/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 upper voltage limit imposed on protected circuits during standardized surge events. The SMAJ8.5AHM3/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMAJ8.5AHM3/H suitable for automotive applications?
Yes, the SMAJ8.5AHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting Tier 1 automotive requirements for power rail and sensor line protection. It is validated for temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock, making SMAJ8.5AHM3/H appropriate for engine control units, body control modules, and ADAS subsystems.
What does the "HM3" suffix mean in SMAJ8.5AHM3/H?
The "HM3" suffix in SMAJ8.5AHM3/H denotes halogen-free, RoHS-compliant construction with matte tin-plated leads and JESD 201 Class 2 whisker resistance. It distinguishes this variant from E3 (RoHS-compliant, non-halogen-free) and HE3 (AEC-Q101 + RoHS) versions. The "H" indicates tape-and-reel packaging in 7-inch reels (1800 units), and "/H" confirms the revision code per Vishay's ordering nomenclature.
How does the SMAJ8.5AHM3/H compare to bidirectional TVS diodes like SMAJ8.5CA?
The SMAJ8.5AHM3/H is unidirectional and intended for DC power line or single-polarity signal protection, with cathode marked for correct orientation. In contrast, SMAJ8.5CA is bidirectional and symmetrical - suitable for AC lines or differential signals. SMAJ8.5AHM3/H offers lower leakage (10 μA vs. 20 μA for SMAJ8.5CA) and avoids ambiguity in polarity-sensitive placements, making SMAJ8.5AHM3/H preferable for 12 V automotive supply rails.
What is the thermal resistance of the SMAJ8.5AHM3/H in standard mounting conditions?
The SMAJ8.5AHM3/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, per Vishay's datasheet test condition. Its junction-to-lead resistance (RθJL) is 30 °C/W, supporting effective heat transfer to PCB copper. These values enable reliable operation at 3.3 W steady-state dissipation up to 50 °C ambient, critical for SMAJ8.5AHM3/H deployment in enclosed automotive ECUs.
SMAJ8.5AHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ8.5AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHM3/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/H reliable?
The price and inventory of SMAJ8.5AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHM3/H?
SMAJ8.5AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHM3/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/H?
For technical support, including SMAJ8.5AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHM3/H requirements.
6.How does Aetrix verify that SMAJ8.5AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHM3/H?
All SMAJ8.5AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ8.5AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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