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Vishay General Semiconductor - Diodes Division SMBJ85AHM3_A/I
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- Part No.:
- SMBJ85AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHM3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,517
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Product details
Overview
SMBJ85AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supply inputs, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMBJ85AHM3_A/I datasheet, SMBJ85AHM3_A/I pinout, SMBJ85AHM3_A/I application, or SMBJ85AHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance under surge conditions, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only when reverse voltage exceeds VBR to shunt transient energy to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables rapid voltage limiting during ESD or lightning-induced surges.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and supports automated SMT placement due to its low-profile SMB package. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - validated for automotive-grade reliability in engine control units and ADAS power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 12 V/24 V/48 V systems. |
| VBR (Breakdown Voltage) | 94.4–104 V at IT = 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during transients without premature triggering. |
| VC (Clamping Voltage) | 137 V at IPPM = 4.4 A - peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress level. |
| PPPM (Peak Pulse Power) | 600 W - maximum transient energy absorption capability with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 compliance. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - minimal standby power loss and negligible loading on sensitive analog/sensor circuits. |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB layout and derating requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (IFSM = 100 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 85 V rail); initiates avalanche conduction when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and body electronics; supports PPAP documentation and long-term reliability under thermal cycling. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for global OEMs; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 600 W peak pulse power (10/1000 µs) | Provides robust immunity against ISO 7637-2 pulse 1/2a/5a and IEC 61000-4-5 surges in 24 V/48 V vehicle architectures. |
| Fast response time & low clamping ratio | Sub-nanosecond turn-on and VC/VBR ≈ 1.45 ensure minimal overvoltage exposure to downstream MOSFETs, MCUs, and CAN transceivers. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume manufacturing using 260 °C peak profile. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 24 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and ground to limit transient voltage before DC-DC converter input stage. Use Value: Clamps 137 V at 4.4 A, protecting downstream regulators and microcontrollers from >100 V surges while maintaining <1 µA leakage at nominal 24 V. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to ESD and inductive switching noise. IC Role / Device Role / Timing Role: TVS placed across sensor output terminals to suppress fast transients before analog front-end amplifier or ADC input. Use Value: Low capacitance and sub-ns response prevent signal distortion; 85 V VWM avoids interference with normal loop voltage swing (up to ~30 V). |
| Telecom DC Power Feeding | Motor Drive Gate Driver Supply Protection |
|
Use Scenario: PoE-powered remote radio units receiving 48 V DC via Ethernet cable, vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS on DC input rail upstream of PoE interface IC and DC-DC converters. Use Value: 600 W rating handles IEC 61000-4-5 Combination Wave (10/700 µs) surges; AEC-Q101 qualification adds confidence in field longevity. |
Use Scenario: Isolated gate driver supplies (e.g., for IGBTs in HVAC inverters) subjected to cross-talk and Miller-induced spikes. IC Role / Device Role / Timing Role: TVS mounted directly at gate driver VDD pin to clamp overshoot before internal LDO or regulator. Use Value: 137 V clamping prevents damage to 15 V-rated gate drivers; SMB footprint allows compact placement near critical nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85AHE3_A/I | Same electrical specs and SMB package, but RoHS-compliant (E3) without halogen-free certification; no AEC-Q101 qualification. | Approved for commercial/industrial use only; not suitable for automotive production programs requiring AEC-Q101 traceability. | Select SMBJ85AHM3_A/I when halogen-free content and automotive qualification are mandatory; choose SMBJ85AHE3_A/I for cost-sensitive non-automotive designs. |
| SMCJ85A-HM3 | Higher 1500 W PPPM rating in larger SMC (DO-214AB) package; identical VWM/VBR/VC specs; same HM3 halogen-free AEC-Q101 qualification. | Used where higher surge energy handling is required (e.g., main board-level protection), but requires larger PCB area and different pad layout. | Choose SMBJ85AHM3_A/I for space-constrained layouts needing 600 W protection; select SMCJ85A-HM3 when system-level surge tests exceed 600 W capability. |
Compared with SMBJ85AHE3_A/I, SMBJ85AHM3_A/I adds halogen-free compliance and AEC-Q101 qualification without electrical trade-offs; versus SMCJ85A-HM3, it trades 2.5× surge power for 40% smaller footprint and lower thermal mass - enabling faster response in point-of-load protection.
Availability
SMBJ85AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feeding systems requiring stable component supply, long-term lifecycle support, and full AEC-Q101 traceability.
Supply support for SMBJ85AHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for precise clamping, low leakage, and robust surge handling in harsh environments.
FAQ
What is the clamping voltage of SMBJ85AHM3_A/I at its rated peak pulse current?
The SMBJ85AHM3_A/I has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 4.4 A under a 10/1000 µs waveform. This value represents the highest voltage the protected circuit will experience during a standardized surge event, ensuring downstream components like DC-DC controllers or microcontrollers remain within safe operating limits. The SMBJ85AHM3_A/I maintains this clamping performance across its qualified temperature range (-55 °C to +150 °C).
Is SMBJ85AHM3_A/I qualified for automotive applications?
Yes, SMBJ85AHM3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. The HM3 suffix explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - making SMBJ85AHM3_A/I suitable for production use in engine control modules, ADAS power supplies, and body electronics where long-term field reliability is mandated.
How does the SMBJ85AHM3_A/I differ from the SMBJ85A-E3 variant?
The SMBJ85AHM3_A/I differs from SMBJ85A-E3 in three key ways: it carries halogen-free certification (HM3 vs. E3), is AEC-Q101 qualified (whereas E3 is commercial grade only), and uses a different tape-and-reel packaging code (A/I). Electrically, both share identical VWM (85 V), VBR (94.4–104 V), VC (137 V), and PPPM (600 W) specifications. The SMBJ85AHM3_A/I is therefore the preferred choice for automotive Tier 1 suppliers requiring full compliance documentation and material declarations.
What is the thermal resistance of SMBJ85AHM3_A/I, and how does it affect PCB layout?
The SMBJ85AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and guides thermal design: for sustained 5.0 W power dissipation, a 50 °C rise above ambient is expected. To maintain reliability under repeated surges, designers should maximize copper area around both terminals and consider thermal vias - especially in automotive applications where ambient temperatures may exceed 85 °C.
Can SMBJ85AHM3_A/I be used in bidirectional protection circuits?
No, SMBJ85AHM3_A/I is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed (e.g., positive supply to ground). For bidirectional applications such as AC lines or data bus protection, Vishay offers the SMBJ85CA variant - which features symmetrical breakdown in both directions and uses a CA suffix. Using SMBJ85AHM3_A/I in a bidirectional configuration would result in forward conduction during negative half-cycles, potentially damaging the device or failing to protect the circuit.
SMBJ85AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 4.4A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ85AHM3_A/I FAQ
1.How can I place an order for SMBJ85AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHM3_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 SMBJ85AHM3_A/I reliable?
The price and inventory of SMBJ85AHM3_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 SMBJ85AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ85AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHM3_A/I?
SMBJ85AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHM3_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 SMBJ85AHM3_A/I?
For technical support, including SMBJ85AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ85AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHM3_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 SMBJ85AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ85AHM3_A/I?
All SMBJ85AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHM3_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 SMBJ85AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ85AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHM3_A/I Tags
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