My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ85AHM3/I
- Part No.:
- SMCJ85AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHM3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,504
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ85AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 85 V standoff voltage (VWM), 137 V clamping voltage (VC) at 10.9 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients.
For engineers reviewing the SMCJ85AHM3/I datasheet, SMCJ85AHM3/I pinout, SMCJ85AHM3/I application, or SMCJ85AHM3/I equivalent, this device is selected for robust 1500 W transient suppression in space-constrained SMC-packaged designs requiring AEC-Q101 qualification, halogen-free RoHS compliance, and stable clamping under 10/1000 μs surges.
Technical Context
The SMCJ85AHM3/I operates as a unidirectional avalanche diode with a breakdown voltage (VBR) range of 94.4 V to 104 V at 1 mA test current, enabling precise overvoltage thresholding. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while glass-passivated junction construction guarantees reliability under repeated surge stress.
Designed for surface-mount automated assembly, it meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and features matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band on the SMC package body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 94.4 V / 104 V at 1 mA - Ensures consistent avalanche initiation across production lots |
| VC @ IPPM | 137 V at 10.9 A - Clamped voltage during full 1500 W 10/1000 μs surge event |
| PPPM | 1500 W - Peak transient energy absorption capability without failure |
| ID @ VWM | 1.0 μA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Standardized 7.75 mm × 6.22 mm footprint with thermal pad compatibility |
Pinout & Package
SMCJ85AHM3/I uses the industry-standard SMC (DO-214AB) surface-mount package: 7.75 mm × 6.22 mm body, 2.06 mm height, cathode band marking on one end. Leads are matte tin-plated for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; carries surge current to return path |
| Cathode | High-side connection point | Marked by band; connected to protected line; blocks reverse current until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental regulations and material restrictions |
| 1500 W peak pulse power | Withstands high-energy transients from inductive load switching without degradation |
| Fast response time < 1 ps | Clamps within picoseconds of transient onset, protecting downstream silicon before damage occurs |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without moisture sensitivity concerns |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting gate drivers and MCU I/O in 12 V/24 V vehicle power distribution modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient spikes on power rails and signal lines upstream of sensitive control ICs. Use Value: Maintains 85 V standoff while clamping to 137 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. | Use Scenario: Safeguarding encoder feedback lines and PWM outputs in variable-frequency drives subject to back-EMF surges from brushless motor commutation. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor placed directly at connector entry points to shunt inductive kickback away from analog front-ends. Use Value: 1.0 μA leakage at 85 V preserves signal fidelity on high-resolution position sensing lines without loading effects. |
| Telecom DC Power Input | Consumer Appliance Control Board |
Use Scenario: Secondary-side surge protection on 48 V DC input rails of telecom base station power supplies compliant with IEC 61000-4-5 Level 4. IC Role / Device Role / Timing Role: High-power TVS absorbing line-to-ground surges before they reach DC/DC converters and PMICs. Use Value: 1500 W PPPM rating handles 4 kV/2 kA combination wave surges with no derating required at +85 °C ambient. | Use Scenario: Overvoltage protection on microcontroller reset and communication pins (UART, I²C) in washing machine main control boards subjected to relay coil flyback. IC Role / Device Role / Timing Role: Low-leakage unidirectional clamp isolating digital logic from 12 V solenoid driver noise coupling. Use Value: Cathode-band polarity marking enables foolproof placement during automated SMT assembly, reducing field failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85AHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, lower thermal mass) | Not suitable for 1500 W surge events; limited to low-energy ESD or secondary protection | Select only when board space is critical and surge energy is ≤ 400 W |
| SMCJ85A-M3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101), M3 halogen-free RoHS only | Lacks automotive qualification; acceptable for industrial/commercial use where AEC-Q101 is not mandated | Choose for cost-sensitive non-automotive designs requiring identical performance and footprint |
Compared with SMCJ85AHM3/I, SMAJ85AHE3/A offers smaller size but insufficient surge capacity for primary protection, while SMCJ85A-M3/57T matches all key parameters except automotive qualification-making it viable for industrial applications where AEC-Q101 is unnecessary.
Availability
SMCJ85AHM3/I is available at Aetrix Electronics and suitable for automotive power modules, industrial motor drives, telecom DC inputs, and consumer appliance control boards requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMCJ85AHM3/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 targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom systems needing robust, standardized, and qualification-backed TVS solutions.
FAQ
What is the clamping voltage of SMCJ85AHM3/I at its rated peak pulse current?
The SMCJ85AHM3/I has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current (IPPM) of 10.9 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events. The SMCJ85AHM3/I maintains this clamping performance across its specified operating temperature range of -55 °C to +150 °C.
Is SMCJ85AHM3/I qualified for automotive applications?
Yes, SMCJ85AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88394. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and surge endurance-validating its suitability for under-hood and chassis-mounted automotive electronics. The SMCJ85AHM3/I meets the reliability requirements for powertrain, body control, and ADAS subsystems.
What does the "HM3" suffix indicate in SMCJ85AHM3/I?
"HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction per Vishay's ordering nomenclature. It distinguishes SMCJ85AHM3/I from commercial variants (e.g., "M3") and non-halogen-free versions ("E3"). The "I" suffix specifies 13″ tape-and-reel packaging (3500 units/reel), while "H" would indicate 7″ reel (850 units). The SMCJ85AHM3/I thus combines environmental compliance, automotive qualification, and high-volume packaging.
How does SMCJ85AHM3/I differ from bidirectional SMCJ85CA variants?
SMCJ85AHM3/I is unidirectional, with polarity marked by a cathode band and functional only in reverse-biased mode; SMCJ85CA is bidirectional, symmetric in both directions with no polarity marking. Electrically, SMCJ85AHM3/I has VWM = 85 V and VBR = 94.4–104 V, while SMCJ85CA shares the same VWM and VBR but conducts in both polarities. The SMCJ85AHM3/I is used where DC bias exists (e.g., power rail protection), unlike AC or differential line applications requiring bidirectional clamping.
What is the thermal resistance of SMCJ85AHM3/I, and how does it affect layout?
The SMCJ85AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on minimum recommended copper pads (0.31″ × 0.31″ per terminal). To maintain TJ ≤ 150 °C under 1500 W surges, PCB layout must include adequate copper pour and thermal vias-especially critical in automotive applications where ambient temperatures exceed 85 °C. The SMCJ85AHM3/I's SMC package supports such thermal management via its exposed leadframe structure.
SMCJ85AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
SMCJ85AHM3/I FAQ
1.How can I place an order for SMCJ85AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHM3/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 SMCJ85AHM3/I reliable?
The price and inventory of SMCJ85AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ85AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHM3/I?
SMCJ85AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHM3/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 SMCJ85AHM3/I?
For technical support, including SMCJ85AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHM3/I requirements.
6.How does Aetrix verify that SMCJ85AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHM3/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 SMCJ85AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ85AHM3/I?
All SMCJ85AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHM3/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 SMCJ85AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ85AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85AHM3/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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
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 …
