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Vishay General Semiconductor - Diodes Division SMBJ85CAHE3_A/I
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- Part No.:
- SMBJ85CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHE3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
SMBJ85CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on power and signal lines. It features 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), used in industrial sensor interface protection.
For engineers reviewing the SMBJ85CAHE3_A/I datasheet, SMBJ85CAHE3_A/I pinout, SMBJ85CAHE3_A/I application, or SMBJ85CAHE3_A/I equivalent, this device serves as a robust, AEC-Q101-qualified transient protector for bidirectional DC bus and communication line surge suppression where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (94.4–104 V), VC (137 V), and IPPM (4.4 A) in either direction. Its glass-passivated junction ensures stable leakage performance (ID ≤ 1.0 µA at VWM) and low incremental surge resistance, enabling precise overvoltage limiting without polarity sensitivity.
The device is rated for TJ = –55 °C to +150 °C, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 - confirmed by HE3 suffix and ordering code "SMBJ85CAHE3_A/I". Thermal resistance RθJA is 100 °C/W on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - guaranteed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 137 V at 4.4 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 600 W - peak transient energy absorption capability under standardized surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - extended junction temperature rating supporting operation in harsh industrial environments |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm max length and 2.20 mm max height |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with cathode/anode roles undefined due to symmetrical construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Either side accepts bidirectional surge; no fixed anode/cathode designation |
| Terminal 2 | Transient input/output node | Paired terminal completing symmetrical clamping path; interchangeable with Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics - confirmed by HE3 suffix and "_A/I" revision code |
| 600 W peak pulse power | Robust surge handling per 10/1000 µs waveform, enabling single-device protection of 24 V/48 V DC buses |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during transients, reducing risk of IC latch-up or gate oxide damage |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking preconditioning |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term leakage performance across temperature and lifetime |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation cabinets exposed to relay coil flyback and EMI. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing ±1 kV EFT bursts per IEC 61000-4-4. Use Value: Limits induced transients to ≤137 V, preventing ADC saturation and microcontroller reset while maintaining <1 µA leakage at 85 V nominal rail. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044) against load dump and ISO 7637-2 pulse 1/2/5a surges in body control modules. IC Role / Device Role / Timing Role: Primary TVS on CAN_H/CAN_L differential pair, operating symmetrically to clamp both positive and negative transients without polarity bias. Use Value: Clamps 10/1000 µs pulses up to 4.4 A while holding differential voltage within safe transceiver limits, validated per AEC-Q101 for automotive deployment. |
| DC Power Rail Protection | Telecom Line Interface |
Use Scenario: Guarding 48 V PoE-powered equipment inputs against lightning-induced surges and hot-swap transients in telecom infrastructure. IC Role / Device Role / Timing Role: Secondary-level TVS mounted directly at connector entry point, upstream of DC-DC converter input filter. Use Value: Absorbs 600 W surges with 137 V clamping, reducing stress on primary MOVs and enabling smaller, lower-cost front-end protection networks. |
Use Scenario: Shielding RS-485/RS-232 data lines in base station remote radio units from induced surges during nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional transient suppressor bridging differential pair to chassis ground, leveraging symmetrical VBR to prevent signal inversion during clamping. Use Value: Maintains signal integrity with <1 µA leakage at 85 V standoff, enabling reliable operation in multi-drop configurations without DC bias shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | No functional difference; selected when halogen-free material compliance is mandated | Choose SMBJ85CAHM3_A/I if environmental compliance requires halogen-free packaging |
| SMCJ85CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package with 1500 W PPPM rating | Higher surge margin for infrequent extreme events (e.g., direct lightning coupling); requires larger PCB area | Choose SMCJ85CAHE3_A/I when system-level surge testing exceeds 600 W requirements |
Compared with SMBJ85CAHE3_A/I, SMBJ85CAHM3_A/I offers identical protection performance with halogen-free construction, while SMCJ85CAHE3_A/I provides higher 1500 W surge capacity in a physically larger footprint - selection depends on environmental mandates and worst-case surge energy budget.
Availability
SMBJ85CAHE3_A/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus nodes, and 48 V DC power rail protection requiring stable component supply and AEC-Q101-qualified reliability.
Supply support for SMBJ85CAHE3_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, precision, and automotive-grade qualification.
The SMBJ series delivers standardized transient suppression in compact SMB packages, engineered for high-volume industrial and automotive applications demanding consistent clamping, low leakage, and AEC-Q101 validation.
FAQ
What is the clamping voltage of SMBJ85CAHE3_A/I at its rated peak pulse current?
The SMBJ85CAHE3_A/I has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current (IPPM) of 4.4 A under the 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ85CAHE3_A/I maintains this clamping performance bidirectionally.
Is SMBJ85CAHE3_A/I suitable for automotive applications?
Yes, SMBJ85CAHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and ordering code "_A/I", making it suitable for automotive applications including body electronics, infotainment interfaces, and CAN/LIN bus protection. Its operating junction temperature range (–55 °C to +150 °C), MSL Level 1 rating, and validated surge performance meet automotive reliability requirements. The SMBJ85CAHE3_A/I is explicitly listed in Vishay's AEC-Q101 qualified product documentation.
How does the bidirectional design of SMBJ85CAHE3_A/I affect its use in circuit layout?
The SMBJ85CAHE3_A/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during PCB placement. This simplifies layout for differential lines (e.g., CAN, RS-485) and AC-coupled signals, as either terminal can connect to the protected line or ground without affecting clamping behavior. Unlike unidirectional TVS diodes, the SMBJ85CAHE3_A/I requires no cathode band alignment, reducing assembly errors and enabling automated placement without vision-based orientation checks.
What is the maximum reverse leakage current for SMBJ85CAHE3_A/I at its stand-off voltage?
The SMBJ85CAHE3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its 85 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems and preserves signal integrity on high-impedance sensor or communication lines. The SMBJ85CAHE3_A/I maintains this specification across its full operating temperature range, supported by glass-passivated junction technology.
Can SMBJ85CAHE3_A/I be used in place of a unidirectional TVS like SMBJ85AHE3_A/I?
No - SMBJ85CAHE3_A/I is strictly bidirectional and cannot replace unidirectional types such as SMBJ85AHE3_A/I in circuits requiring forward conduction (e.g., DC power rail clamping with defined polarity). While both share identical VWM (85 V) and VC (137 V), the unidirectional SMBJ85AHE3_A/I conducts forward current up to 100 A (IFSM) and has a cathode band for orientation; the SMBJ85CAHE3_A/I lacks forward conduction capability and has no polarity marking. Substitution would compromise circuit functionality in polarity-sensitive designs.
SMBJ85CAHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85CAHE3_A/I FAQ
1.How can I place an order for SMBJ85CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHE3_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 SMBJ85CAHE3_A/I reliable?
The price and inventory of SMBJ85CAHE3_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 SMBJ85CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHE3_A/I?
SMBJ85CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHE3_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 SMBJ85CAHE3_A/I?
For technical support, including SMBJ85CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ85CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHE3_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 SMBJ85CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHE3_A/I?
All SMBJ85CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHE3_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 SMBJ85CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ85CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHE3_A/I Tags
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