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Vishay General Semiconductor - Diodes Division SMCJ8.5AHM3_A/I
- Part No.:
- SMCJ8.5AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHM3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,508
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Product details
Overview
SMCJ8.5AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 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 104.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform.
For engineers reviewing the SMCJ8.5AHM3_A/I datasheet, SMCJ8.5AHM3_A/I pinout, SMCJ8.5AHM3_A/I application, or SMCJ8.5AHM3_A/I equivalent, this device is selected for robust overvoltage protection in automotive-grade power rails, industrial sensor interfaces, and DC input stages where halogen-free, AEC-Q101-qualified TVS performance and MSL Level 1 reflow compatibility are required.
Technical Context
The SMCJ8.5AHM3_A/I operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients. Its low incremental surge resistance and tightly controlled clamping behavior ensure predictable energy diversion during 10/1000 μs surges up to 1500 W without thermal runaway.
Designed for surface-mount automation, it uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance. The cathode band marking identifies polarity, and its SMC package supports 0.31" × 0.31" copper pad layout per Vishay's recommended thermal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above nominal 5–7 V supply rails. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction under normal operation. |
| VC @ IPPM | 14.4 V at 104.2 A - Clamping voltage limits downstream IC stress during worst-case 1500 W surge events. |
| PPPM | 1500 W - Peak pulse power rating with 10/1000 μs waveform defines transient energy handling capability. |
| ID @ VWM | 20 μA - Low reverse leakage preserves efficiency in battery-powered or high-impedance signal paths. |
| TJ max. | +150 °C - Maximum junction temperature enables operation in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated placement. |
Pinout & Package
SMCJ8.5AHM3_A/I is housed in the SMC (DO-214AB) package: a molded, halogen-free, RoHS-compliant surface-mount case with matte tin-plated leads. Polarity is marked by a cathode band on the body; the banded end is the cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal avalanche junction | Connected to protected line (e.g., VBUS); conducts surge current to ground when voltage exceeds VBR. |
| Anode (non-banded end) | Cathode of internal avalanche junction | Typically tied to system ground or low-impedance return path; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1, supporting lead-free reflow up to 260 °C peak. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during surge events, reducing risk of latch-up or gate oxide damage in downstream MOSFETs or ICs. |
| Fast response time (< 1 ns) | Clamps transients before propagation into sensitive analog or digital circuitry, preserving signal integrity in high-speed interfaces. |
| 1500 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV surge) events on 12 V automotive power lines without degradation. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp positive-going surges above 14.4 V. Use Value: Prevents permanent damage to microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a events with no derating required up to +125 °C ambient. |
Use Scenario: Shielding 4–20 mA current-loop sensors from ESD and field wiring faults in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used across signal and return lines to suppress common-mode transients. Use Value: Maintains <20 μA leakage at 8.5 V, ensuring minimal impact on loop accuracy while surviving 8 kV contact ESD per IEC 61000-4-2. |
| DC Input Stage Surge Suppression | USB/Serial Port Line Protection |
|
Use Scenario: Safeguarding 5 V/9 V/12 V wall adapter inputs in consumer power supplies against lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS mounted at connector entry point to shunt >1 kV transients before input capacitors. Use Value: 1500 W PPPM rating allows single-device protection for EN 61000-4-5 Level 3 (2 kV line-to-ground) compliance without series impedance. |
Use Scenario: Adding transient immunity to RS-232, RS-485, or USB VBUS lines in embedded gateways and IoT hubs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between data line and local ground to absorb fast-rising EFT bursts. Use Value: Sub-1 ns response and 14.4 V VC limit overshoot below logic threshold of 3.3 V/5 V interface ICs, preventing false triggering or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5AHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR/VC specs. | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD), not IEC 61000-4-5 surge. | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ8.5AHE3_A/I | Same electrical specs and SMC package, but RoHS-compliant commercial grade (not halogen-free or AEC-Q101 qualified). | Lacks automotive qualification and halogen-free certification; unsuitable for Tier-1 automotive BOMs. | Choose for cost-sensitive industrial or consumer designs where AEC-Q101 and halogen-free compliance are not mandated. |
Compared with SMCJ8.5AHM3_A/I, SMAJ8.5AHE3_A/I trades surge robustness for compactness, while SMCJ8.5AHE3_A/I retains identical protection performance but omits halogen-free and automotive qualifications-making SMCJ8.5AHM3_A/I the sole option meeting full automotive production requirements.
Availability
SMCJ8.5AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and DC power supply designs requiring stable component supply with guaranteed halogen-free, AEC-Q101-qualified TVS performance.
Supply support for SMCJ8.5AHM3_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, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where consistent clamping and long-term stability under thermal cycling are critical.
FAQ
What is the clamping voltage of the SMCJ8.5AHM3_A/I under maximum rated surge current?
The SMCJ8.5AHM3_A/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its peak pulse current (IPPM) of 104.2 A using a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88394, Rev. 09-Jan-2024) and reflects the upper bound of voltage seen by protected circuitry during worst-case transient events. The SMCJ8.5AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMCJ8.5AHM3_A/I suitable for automotive applications?
Yes, the SMCJ8.5AHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials-explicitly designated for automotive use via the "HM3" suffix. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge immunity relevant to engine control, body electronics, and ADAS subsystems. The SMCJ8.5AHM3_A/I is approved for under-hood and cabin-mounted modules operating up to +125 °C ambient.
How does the SMCJ8.5AHM3_A/I differ from the SMCJ8.5AHE3_A/I variant?
The SMCJ8.5AHM3_A/I differs from SMCJ8.5AHE3_A/I in three key ways: it is halogen-free (per IEC 61249-2-21), qualified to AEC-Q101, and carries the "HM3" suffix indicating both attributes. Electrically and mechanically, both share identical VWM (8.5 V), VBR (9.44–10.4 V), VC (14.4 V), PPPM (1500 W), and SMC package dimensions. The SMCJ8.5AHM3_A/I is mandatory for Tier-1 automotive BOMs; SMCJ8.5AHE3_A/I serves commercial/industrial applications without those certifications.
What is the thermal resistance of the SMCJ8.5AHM3_A/I, and how does it affect PCB layout?
The SMCJ8.5AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no additional heatsinking. To maintain TJ ≤ 150 °C under sustained 6.5 W power dissipation, designers must allocate sufficient copper area and consider airflow or adjacent thermal mass. The SMCJ8.5AHM3_A/I's RθJL of 15 °C/W indicates efficient heat transfer to PCB traces, reinforcing the need for solid thermal vias beneath pads in high-reliability layouts.
Can the SMCJ8.5AHM3_A/I be used in bidirectional protection circuits?
No-the SMCJ8.5AHM3_A/I is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix and cathode band marking. It conducts only during positive transients relative to its anode. For bidirectional protection-such as AC lines or differential data buses-a part with "CA" suffix (e.g., SMCJ8.5CA) is required. Using SMCJ8.5AHM3_A/I in bidirectional configurations risks failure during negative-going surges, as it lacks symmetrical breakdown characteristics. Always verify polarity alignment before placing the SMCJ8.5AHM3_A/I in circuit.
SMCJ8.5AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 104.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ8.5AHM3_A/I FAQ
1.How can I place an order for SMCJ8.5AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/I reliable?
The price and inventory of SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHM3_A/I?
SMCJ8.5AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/I?
For technical support, including SMCJ8.5AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ8.5AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHM3_A/I?
All SMCJ8.5AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ8.5AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5AHM3_A/I Tags
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