My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ8.5CAHM3/I
- Part No.:
- SMCJ8.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CAHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,009
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ8.5CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 8.5 V stand-off voltage (VWM), 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 - deployed in automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ8.5CAHM3/I datasheet, SMCJ8.5CAHM3/I pinout, SMCJ8.5CAHM3/I application, or SMCJ8.5CAHM3/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and bidirectional clamping performance validated per ANSI/IEEE C62.35.
Technical Context
The SMCJ8.5CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping voltage transients in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling sub-nanosecond response to ESD and lightning-induced surges.
Designed for mounting on 8.0 mm × 8.0 mm copper pads, it delivers 1500 W peak pulse power with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from –55 °C to +150 °C junction temperature. 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) | 8.5 V - Maximum continuous reverse voltage before clamping begins; defines operating margin below breakdown. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed bidirectional avalanche threshold; ensures symmetrical protection. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 104.2 A - Peak voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure. |
| ID (Reverse Leakage) | 20 μA max at VWM - Low leakage preserves signal integrity and minimizes standby power loss. |
| TJ Range | –55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement. |
Pinout & Package
SMCJ8.5CAHM3/I uses the SMC (DO-214AB) package: a 2-terminal, non-polarized, bidirectional TVS diode with no cathode/anode marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no functional distinction. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; symmetrical conduction enables universal placement across differential or single-ended lines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal paths (e.g., RS-485, CAN bus, sensor bridges) without polarity concerns. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules, ADAS camera interfaces, and body electronics requiring zero-failure reliability. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global OEMs and industrial equipment without compromising surge robustness. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning, reducing manufacturing complexity and cost. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine bay or chassis modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed directly at connector entry point to shunt surge energy before reaching precision ADC or signal conditioner. Use Value: Maintains 8.5 V stand-off while clamping to ≤14.4 V, preserving sensor accuracy and preventing latch-up in downstream 5 V microcontrollers. | Use Scenario: Safeguarding 24 V digital input cards in PLCs against field-wiring transients, relay coil flyback, and electrostatic discharge during maintenance. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each channel's input node, operating in parallel with series current-limiting resistor and optocoupler input stage. Use Value: Absorbs 1500 W surges without degradation, enabling >100,000 surge cycles per channel per IEC 61000-4-5 Level 4 compliance. |
| Telecom Interface Protection | Consumer USB/Type-C ESD Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul links and remote radio units from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) mounted adjacent to connector, referenced to common ground plane with minimal loop area. Use Value: Symmetrical 14.4 V clamping ensures balanced common-mode rejection and prevents data corruption during 1 kV/2 kV surge events. | Use Scenario: Front-end ESD protection for USB 2.0 D+/D– lines in portable medical monitors and smart home hubs handling frequent human-contact events. IC Role / Device Role / Timing Role: Bidirectional TVS placed between connector and PHY IC, sized to pass IEC 61000-4-2 ±15 kV contact discharge without triggering false resets. Use Value: 20 μA leakage at 8.5 V avoids signal attenuation on high-impedance data lines while delivering <1 ns response to ESD events. |
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/A | Same VWM (8.5 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients (IEC 61000-4-2 only); unsuitable for ISO 7637-2 or lightning-level surges. | Select when board space is constrained and surge threat level is limited to ESD-only environments. |
| SMCJ8.5CA-E3/57T | Identical electrical specs and SMC package, but commercial-grade (E3 suffix) without AEC-Q101 or halogen-free certification | Approved for industrial/commercial use only; not qualified for automotive production or regulated green procurement. | Select for cost-sensitive non-automotive designs where AEC-Q101 and halogen-free compliance are not mandated. |
Compared with SMCJ8.5CAHE3/A and SMCJ8.5CA-E3/57T, the SMCJ8.5CAHM3/I uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free RoHS compliance - making it the sole choice for automotive Tier-1 suppliers and industrial OEMs requiring full regulatory traceability and high-energy transient resilience.
Availability
SMCJ8.5CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom RS-485 links, and consumer USB front-end protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ8.5CAHM3/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, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure is not an option.
FAQ
What does the "HM3" suffix mean in SMCJ8.5CAHM3/I?
The "HM3" suffix in SMCJ8.5CAHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification for automotive applications. It also specifies tape-and-reel packaging in 13-inch reels (I = 3500 units/reel), distinguishing it from commercial-grade E3/M3 variants and AEC-Q101 HE3/HM3 variants in smaller reels. This makes SMCJ8.5CAHM3/I suitable for Tier-1 automotive production and green procurement programs.
Is SMCJ8.5CAHM3/I unidirectional or bidirectional?
SMCJ8.5CAHM3/I is a bidirectional TVS diode, as confirmed by the "CA" suffix in its part number and explicit documentation stating "Electrical characteristics apply in both directions." Unlike unidirectional variants (e.g., SMCJ8.5A), it has no polarity marking and clamps symmetrically for positive and negative transients - ideal for protecting AC-coupled or floating signal lines such as RS-485, CAN, or sensor bridges.
What is the maximum clamping voltage of SMCJ8.5CAHM3/I and under what test condition?
The maximum clamping voltage (VC) of SMCJ8.5CAHM3/I is 14.4 V, measured at a peak pulse current (IPPM) of 104.2 A using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88394, Rev. 09-Jan-2024) and represents the worst-case voltage imposed on the protected circuit during a high-energy transient event.
Does SMCJ8.5CAHM3/I require a heatsink for 1500 W surge dissipation?
No, SMCJ8.5CAHM3/I does not require an external heatsink for single-event 1500 W surge dissipation because the 10/1000 μs pulse duration is too short for significant thermal accumulation. Its thermal design relies on transient thermal impedance (Fig. 5 in datasheet), and the specified 8.0 mm × 8.0 mm copper pad per terminal provides sufficient heat spreading. However, for repetitive surges or elevated ambient temperatures, derating per Figure 2 must be applied - SMCJ8.5CAHM3/I remains fully functional up to +150 °C junction temperature.
How does SMCJ8.5CAHM3/I compare to SMCJ8.5A in terms of circuit protection capability?
SMCJ8.5CAHM3/I differs fundamentally from SMCJ8.5A: it is bidirectional (CA) versus unidirectional (A), has AEC-Q101 qualification and halogen-free compliance (HM3), and shares identical VWM (8.5 V), VC (14.4 V), and PPPM (1500 W). While SMCJ8.5A requires correct polarity orientation and suits DC-biased lines, SMCJ8.5CAHM3/I eliminates orientation risk and protects AC or floating nodes - making it more versatile in differential interfaces and automotive sensor applications where polarity cannot be guaranteed.
SMCJ8.5CAHM3/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:
- 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):
- 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)
SMCJ8.5CAHM3/I FAQ
1.How can I place an order for SMCJ8.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CAHM3/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 SMCJ8.5CAHM3/I reliable?
The price and inventory of SMCJ8.5CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CAHM3/I?
SMCJ8.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CAHM3/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 SMCJ8.5CAHM3/I?
For technical support, including SMCJ8.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CAHM3/I requirements.
6.How does Aetrix verify that SMCJ8.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CAHM3/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 SMCJ8.5CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CAHM3/I?
All SMCJ8.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CAHM3/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 SMCJ8.5CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ8.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CAHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
