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Vishay General Semiconductor - Diodes Division SMBJ85CAHM3/H
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- Part No.:
- SMBJ85CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHM3/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,829
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Product details
Overview
SMBJ85CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 85 V stand-off voltage (VWM), 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), making it suitable for protecting MOSFETs and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ85CAHM3/H datasheet, SMBJ85CAHM3/H pinout, SMBJ85CAHM3/H application, or SMBJ85CAHM3/H equivalent, key selection criteria include bidirectional surge suppression capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during ESD or lightning-induced surges, leveraging an avalanche breakdown mechanism with a typical breakdown voltage (VBR) range of 94.4–104 V at 1 mA test current. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
Thermal performance is defined by RθJA = 100 °C/W (junction-to-ambient) and RθJL = 20 °C/W (junction-to-lead), enabling reliable operation up to TJ = +150 °C. The device meets MSL Level 1 per J-STD-020 and supports peak forward surge current (IFSM) up to 100 A (8.3 ms half-sine) only in unidirectional variants - not applicable to SMBJ85CAHM3/H due to its bidirectional construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Ensures consistent avalanche triggering across production lots under standardized test conditions. |
| VC @ IPPM | 137 V at 4.4 A (10/1000 µs) - Clamping voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| PPPM | 600 W - Peak transient energy handling capacity; validated per IEC 61000-4-5 Level 4 surge immunity requirements. |
| ID @ VWM | 1.0 µA max - Ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ range | −55 °C to +150 °C - Enables deployment in automotive engine compartments and industrial outdoor enclosures. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, rated for 260 °C peak reflow (MSL Level 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients and anode during negative transients; symmetric conduction enables dual-polarity protection without external diodes. |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in bidirectional mode; terminals are interchangeable in PCB layout; no band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), and floating sensor inputs without polarity awareness. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges (1.2/50 µs voltage, 8/20 µs current) up to Level 4 (4 kV line-earth) when mounted on 5 mm × 5 mm copper pads. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-20E and JESD201 Class 2 whisker resistance; eliminates brominated flame retardants for safer end-of-life recycling. |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and ADAS sensor interfaces; includes HTOL, temperature cycling, and ESD testing per AEC standard. |
| Low clamping ratio (1.61) | VC/VWM = 137/85 ensures minimal overvoltage overshoot during clamping-critical for safeguarding 100 V-rated MOSFETs and isolated gate drivers. |
Applications
| Industrial Power Supply Protection | Automotive Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails in PLC I/O modules against inductive switching spikes from solenoid drivers. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly across input terminals to shunt >1 kV transients within <1 ns. Use Value: Limits rail voltage to ≤137 V, preventing damage to upstream DC-DC controllers and downstream analog front-ends. |
Use Scenario: Safeguarding LIN bus transceivers and pressure sensor signal lines in engine bay environments. IC Role / Device Role / Timing Role: Bidirectional transient suppressor connected between signal line and ground, absorbing ±1 kV ESD and load dump energy. Use Value: Maintains signal integrity under ISO 10605 (30 kV air discharge) and ISO 7637-2 Pulse 5a (load dump), preserving CAN/LIN communication reliability. |
| Telecom Equipment Surge Suppression | Consumer Appliance Motor Control Protection |
|
Use Scenario: Shielding Ethernet PHY power pins and PoE injectors from lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V PoE supply lines, coordinated with secondary GDT or MOV stages. Use Value: Clamps 600 W surges within 10/1000 µs envelope, reducing let-through energy to <10 mJ for downstream TVS arrays and ICs. |
Use Scenario: Protecting microcontroller GPIOs and H-bridge gate drivers in smart washing machine motor inverters. IC Role / Device Role / Timing Role: Bidirectional clamp across half-bridge outputs to suppress shoot-through-induced voltage spikes during PWM commutation. Use Value: Prevents latch-up in 5 V logic circuits by limiting transient excursions to 137 V, compatible with 100 V MOSFET drain-source ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial/industrial use where halogen-free mandate does not apply (e.g., non-automotive consumer goods). | Select SMBJ85CAHE3/H when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is still needed. |
| SMAJ85CA | Lower peak pulse power (400 W vs. 600 W); SMA package (smaller footprint, higher thermal resistance). | Limited to lower-energy surge environments (IEC 61000-4-5 Level 2); unsuitable for automotive load dump or telecom lightning protection. | Choose SMAJ85CA only for space-constrained, low-risk applications where 400 W rating suffices and PCB area is critical. |
Compared with SMBJ85CAHE3/H, SMBJ85CAHM3/H adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMAJ85CA, it delivers 50 % higher surge power handling and superior thermal dissipation via the larger SMB package-making it the preferred choice for automotive and industrial-grade designs requiring robust, certified protection.
Availability
SMBJ85CAHM3/H is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, telecom surge protection, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ85CAHM3/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 high-reliability, automotive-qualified, and industry-standard solutions.
The SMBJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, precise clamping, and high surge endurance are mandatory.
FAQ
What is the clamping voltage of SMBJ85CAHM3/H under a 10/1000 µs surge?
The SMBJ85CAHM3/H has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A using the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and reflects worst-case device behavior at TA = 25 °C with recommended 5.0 mm × 5.0 mm copper pads. The SMBJ85CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ85CAHM3/H suitable for automotive applications?
Yes, SMBJ85CAHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision) and documented in the Mechanical Data section of datasheet 88392. It undergoes stress testing including HTOL, temperature cycling, and ESD per AEC-Q101 Rev D, making SMBJ85CAHM3/H appropriate for under-hood and chassis-mounted automotive systems such as body control modules and ADAS sensor interfaces.
How does the HM3 suffix differ from HE3 in SMBJ85CAHM3/H?
The HM3 suffix in SMBJ85CAHM3/H indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas HE3 denotes RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical characteristics and mechanical packaging, but SMBJ85CAHM3/H meets stricter environmental mandates (e.g., JEDEC J-STD-20E) required for automotive Tier 1 suppliers and green electronics initiatives.
What is the maximum reverse leakage current for SMBJ85CAHM3/H at its stand-off voltage?
The SMBJ85CAHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 85 V and TA = 25 °C, as specified in the Electrical Characteristics table on page 2 of Vishay document 88392. This ultra-low leakage ensures minimal power loss in battery-powered sensor nodes and preserves accuracy in high-impedance analog monitoring circuits using SMBJ85CAHM3/H.
Can SMBJ85CAHM3/H be used in bidirectional AC signal protection?
Yes, SMBJ85CAHM3/H is explicitly designed for bidirectional applications, as indicated by the "CA" suffix and confirmed in the "DEVICES FOR BIDIRECTION APPLICATIONS" section of the datasheet. Its symmetrical VBR and VC characteristics in both polarities make SMBJ85CAHM3/H ideal for protecting AC-coupled lines such as RS-485, CAN FD, and audio signal paths-without requiring external series diodes or polarity-aware layout.
SMBJ85CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ85CAHM3/H FAQ
1.How can I place an order for SMBJ85CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHM3/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 SMBJ85CAHM3/H reliable?
The price and inventory of SMBJ85CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHM3/H?
SMBJ85CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHM3/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 SMBJ85CAHM3/H?
For technical support, including SMBJ85CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHM3/H requirements.
6.How does Aetrix verify that SMBJ85CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHM3/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 SMBJ85CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHM3/H?
All SMBJ85CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHM3/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 SMBJ85CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ85CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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