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Vishay General Semiconductor - Diodes Division SMBJ85CAHM3_A/I
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- Part No.:
- SMBJ85CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHM3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,137
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Product details
Overview
SMBJ85CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power 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 (10/1000 μs waveform). It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ85CAHM3_A/I datasheet, SMBJ85CAHM3_A/I pinout, SMBJ85CAHM3_A/I application, or SMBJ85CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, 137 V VC under 4.4 A surge, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and AEC-Q101 qualification suitability for automotive-grade designs.
Technical Context
This TVS diode operates symmetrically in both directions, with identical electrical characteristics for forward and reverse bias - confirmed by "CA" suffix designation and explicit note: "Electrical characteristics apply in both directions." Its silicon junction is glass passivated, ensuring stable leakage and robust surge endurance.
It delivers 600 W peak pulse power per 10/1000 μs waveform at TA = 25 °C, derated linearly above 25 °C per Fig. 2, and exhibits low incremental surge resistance enabling tight clamping. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting reliable operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 94.4–104 V at IT = 1 mA - Voltage at which device enters avalanche breakdown; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 137 V at IPPM = 4.4 A - Maximum voltage seen across protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capacity under standardized 10/1000 μs waveform; validates protection level against common ESD/lightning surges. |
| ID (Reverse Leakage) | 1.0 μA max at VWM = 85 V - Minimal standby current; avoids signal distortion or power loss in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function identically as anode/cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | Either terminal serves as input/output for transient current; no cathode band marking required; enables placement without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware layout and supports AC-coupled or floating signal line protection. |
| 600 W peak pulse power | Validated per 10/1000 μs waveform - meets IEC 61000-4-5 Level 3 surge immunity requirements for industrial interfaces. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and full RoHS compliance - satisfies environmental mandates for global OEM production. |
| AEC-Q101 qualified | Qualified per automotive reliability standard - supports use in engine control units, body electronics, and ADAS sensor modules. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH - allows direct placement without baking or dry-pack handling. |
Applications
| Industrial Motor Drive Protection | Automotive Sensor Signal Lines |
|---|---|
|
Use Scenario: Suppresses switching spikes induced by IGBT/MOSFET turn-off in 24 V DC motor controllers. IC Role / Device Role / Timing Role: Bidirectional TVS placed across H-bridge outputs or encoder feedback lines to clamp inductive kickback. Use Value: Limits transient voltage to ≤137 V, preventing latch-up or gate oxide damage in driver ICs rated for 150 V absolute maximum. |
Use Scenario: Shields LIN/CAN physical layer inputs of temperature or pressure sensors in engine bays. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between signal line and ground to absorb load-dump and ISO 7637-2 pulses. Use Value: Withstands 600 W surges while maintaining <1.0 μA leakage at 85 V, preserving signal integrity in low-current analog sensor paths. |
| Telecom Power Input Stage | Consumer USB-C Port ESD Protection |
|
Use Scenario: Guards 48 V PoE-powered equipment front-end against lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Primary-level TVS mounted at RJ45 connector to shunt common-mode transients before DC-DC converter input. Use Value: Clamps 10/1000 μs surges to 137 V within 1 ns response time, protecting downstream 100 V-rated MOSFETs and controllers. |
Use Scenario: Protects USB-C CC and VBUS lines in portable docking stations against human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS placed on differential CC pins to suppress ±15 kV contact discharge without polarity constraints. Use Value: Delivers 600 W pulse handling and 137 V clamping while meeting USB-IF ESD immunity requirements for reversible connector designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHE3_A/I | Same electrical specs and SMB package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Preferred for commercial-grade industrial controls where halogen-free requirement is absent. | Select when cost-sensitive commercial design does not require halogen-free or automotive qualification. |
| SMAJ85CA | Lower PPPM (400 W); same VWM/VBR/VC; SMA (DO-214AC) package - smaller footprint (4.57 mm × 2.79 mm) and higher thermal resistance (150 °C/W). | Suitable for space-constrained consumer PCBs with lower surge exposure (e.g., USB 2.0 ports). | Choose only if board area is critical and 400 W surge rating suffices; not drop-in due to different package and thermal performance. |
Compared with SMBJ85CAHM3_A/I, the HE3 variant trades halogen-free content and AEC-Q101 for lower cost, while the SMAJ85CA reduces footprint at the expense of 33 % lower surge power and inferior thermal dissipation - requiring careful layout review for sustained surge duty.
Availability
SMBJ85CAHM3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor modules, telecom power interfaces, and USB-C docking stations requiring stable component supply with halogen-free and AEC-Q101-compliant sourcing.
Supply support for SMBJ85CAHM3_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-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems demanding consistent clamping, low leakage, and long-term stability under thermal cycling.
FAQ
What is the clamping voltage of SMBJ85CAHM3_A/I at its rated peak pulse current?
The SMBJ85CAHM3_A/I has a maximum clamping voltage (VC) of 137 V at a peak pulse current (IPPM) of 4.4 A, measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is verified per Vishay's datasheet Figure 1 and Table on page 2. The SMBJ85CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMBJ85CAHM3_A/I suitable for automotive applications?
Yes, SMBJ85CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay datasheet's Mechanical Data section. It meets automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. The SMBJ85CAHM3_A/I is specified for operation from –55 °C to +150 °C junction temperature, making it appropriate for under-hood and body-control module deployments.
Does SMBJ85CAHM3_A/I have polarity markings on the package?
No, SMBJ85CAHM3_A/I is a bidirectional TVS diode and carries no cathode band or polarity marking. Its DO-214AA (SMB) package is symmetrical, and both terminals perform identically regardless of transient polarity - a direct consequence of the "CA" suffix denoting bidirectional construction. This eliminates orientation errors during automated assembly.
What is the maximum reverse leakage current for SMBJ85CAHM3_A/I at its stand-off voltage?
The SMBJ85CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 85 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor interfaces and minimizes standby power loss in battery-operated systems. The SMBJ85CAHM3_A/I maintains this specification across its full operating temperature range per datasheet Note (3).
How does the HM3 suffix differentiate SMBJ85CAHM3_A/I from other SMBJ85CA variants?
The "HM3" suffix on SMBJ85CAHM3_A/I specifies halogen-free, RoHS-compliant construction plus AEC-Q101 qualification - distinguishing it from "HE3" (RoHS only, no halogen-free), "E3" (commercial RoHS), and "M3" (halogen-free RoHS, non-automotive). The SMBJ85CAHM3_A/I is intended for automotive and green-industrial applications where both material compliance and reliability certification are mandatory.
SMBJ85CAHM3_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:
- -
- 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_A/I FAQ
1.How can I place an order for SMBJ85CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHM3_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 SMBJ85CAHM3_A/I reliable?
The price and inventory of SMBJ85CAHM3_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 SMBJ85CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHM3_A/I?
SMBJ85CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHM3_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 SMBJ85CAHM3_A/I?
For technical support, including SMBJ85CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ85CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHM3_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 SMBJ85CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHM3_A/I?
All SMBJ85CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHM3_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 SMBJ85CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ85CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHM3_A/I Tags
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