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Vishay General Semiconductor - Diodes Division SMBJ85CAHE3_B/H
- Part No.:
- SMBJ85CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHE3_B/H.pdf
- Description:
- 600W,85V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,535
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Product details
Overview
SMBJ85CAHE3_B/H 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 power and signal lines. It features a 85 V standoff 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 protection and telecom interface surge suppression.
For engineers reviewing the SMBJ85CAHE3_B/H datasheet, SMBJ85CAHE3_B/H pinout, SMBJ85CAHE3_B/H application, or SMBJ85CAHE3_B/H equivalent, this device is selected for robust ESD and lightning transient protection where bidirectional clamping, AEC-Q101 qualification, and low clamping ratio (<1.62×VWM) are critical in automotive-grade power rail and I/O line designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (94.4 V / 104 V), VC (137 V), and IPPM (4.4 A) in either direction. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), enabling effective suppression of EFT, ESD, and inductive switching spikes.
The device is rated for TJ = –55 °C to +150 °C, meets MSL Level 1 (260 °C reflow), and carries AEC-Q101 qualification - confirmed by HE3 suffix - making it suitable for under-hood automotive electronics and industrial control modules requiring long-term reliability under thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range on protected line. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - guaranteed breakdown onset window; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 137 V at 4.4 A (10/1000 μs) - clamped voltage seen by downstream circuitry during worst-case surge; limits stress on ICs/MOSFETs. |
| PPPM | 600 W - peak transient energy absorption capability; supports repetitive surges up to 0.01% duty cycle without degradation. |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage at rated standoff; prevents power loss or false triggering in high-impedance sensing paths. |
| TJ max. | +150 °C - maximum junction temperature rating; enables operation in engine bay or enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous polarity; no fixed polarity required in layout. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completing the symmetrical clamping path; enables placement across differential or single-ended lines without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), or ungrounded DC rails without polarity constraints. |
| AEC-Q101 qualified | Validated for automotive applications including powertrain sensors and body control modules per stress test requirements (HTOL, TC, HAST). |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 2 Ω source impedance when properly laid out with minimum copper pads. |
| Low clamping ratio | VC/VWM = 1.61 - tight voltage margin between standoff and clamping improves system-level overvoltage immunity vs. higher-ratio TVS devices. |
| MSL Level 1 | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning; eliminates moisture sensitivity handling overhead. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBAT and GND to clamp positive/negative spikes up to ±137 V. Use Value: Prevents latch-up or gate oxide damage in downstream logic and analog front-ends during ISO 7637-2 Pulse 5a/b events. |
Use Scenario: Shielding 4–20 mA current loop transmitters and RTD input stages from field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Placed across loop terminals to limit voltage excursion during cable disconnect or relay switching. Use Value: Maintains signal integrity below 137 V clamping threshold while adding <1.0 μA leakage that avoids loop error. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE injectors against lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Differential-mode TVS across transformer secondary windings to suppress common-mode transients. Use Value: Achieves <1 ns response with symmetrical clamping, preserving signal timing margins in 100BASE-TX and faster links. |
Use Scenario: Suppressing back-EMF from brushed DC motors in washing machine control boards and HVAC blower circuits. IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb inductive energy during MOSFET turn-off. Use Value: Limits voltage overshoot to 137 V, preventing MOSFET avalanche failure and reducing snubber component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHM3_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulations. | Choose SMBJ85CAHM3_B/H if halogen-free bill-of-materials is required; otherwise SMBJ85CAHE3_B/H offers standard RoHS compliance. |
| SMCJ85CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package with 1500 W PPPM rating and higher IPPM (10.3 A). | Used where higher surge energy handling is needed (e.g., outdoor telecom cabinets); requires larger PCB area and different pad layout. | Choose SMCJ85CAHE3_A/H only when 600 W is insufficient and board space allows SMC footprint; not drop-in compatible. |
Compared with SMBJ85CAHE3_B/H, SMBJ85CAHM3_B/H offers identical protection performance with halogen-free construction, while SMCJ85CAHE3_A/H provides 2.5× higher surge capacity at the cost of larger size and non-interchangeable layout - selection depends strictly on mechanical constraint and regulatory requirement.
Availability
SMBJ85CAHE3_B/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface design, and telecom line interface applications requiring stable component supply with AEC-Q101 assurance and consistent lead-time visibility.
Supply support for SMBJ85CAHE3_B/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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in space-constrained, thermally demanding environments - particularly targeting automotive, industrial automation, and infrastructure equipment where surge immunity must coexist with miniaturization and long service life.
FAQ
What does the "CA" suffix indicate in SMBJ85CAHE3_B/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ85CAHE3_B/H clamps voltage transients equally in both polarities, unlike unidirectional "A" variants. This makes it ideal for AC-coupled lines, differential interfaces, or any application where polarity reversal or negative-going surges must be suppressed without external circuitry. The device has no polarity marking and functions identically regardless of terminal orientation.
Is SMBJ85CAHE3_B/H qualified for automotive use?
Yes, SMBJ85CAHE3_B/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its part number. It has passed stress tests including high-temperature operating life, temperature cycling, and humidity testing required for automotive electronics. This qualification supports deployment in engine control units, body modules, and ADAS sensor interfaces where reliability under thermal and vibration stress is mandatory.
What is the maximum clamping voltage of SMBJ85CAHE3_B/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ85CAHE3_B/H is 137 V at 4.4 A peak pulse current with a 10/1000 μs waveform. This value represents the highest voltage imposed on protected circuitry during standardized surge events. It is measured across the device terminals under specified test conditions and remains consistent across both directions due to its bidirectional design.
How does SMBJ85CAHE3_B/H differ from unidirectional SMBJ85AHE3_B/H?
SMBJ85CAHE3_B/H differs from SMBJ85AHE3_B/H in polarity behavior: the "CA" version is bidirectional with symmetrical clamping in both directions and no cathode band marking, whereas the "A" version is unidirectional with a marked cathode and conducts only in reverse bias. Electrical parameters like VWM (85 V) and VC (137 V) are identical, but the unidirectional type cannot suppress negative surges without additional components.
What PCB layout guidance applies to SMBJ85CAHE3_B/H for optimal surge performance?
For optimal surge performance, SMBJ85CAHE3_B/H should be mounted using the minimum recommended pad layout per Vishay's DO-214AA specification: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Short, wide traces to protected nodes minimize inductance, and ground planes beneath the device improve thermal dissipation and reduce clamping voltage overshoot during fast transients.
SMBJ85CAHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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 (SMB)
SMBJ85CAHE3_B/H FAQ
1.How can I place an order for SMBJ85CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHE3_B/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 SMBJ85CAHE3_B/H reliable?
The price and inventory of SMBJ85CAHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHE3_B/H?
SMBJ85CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHE3_B/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 SMBJ85CAHE3_B/H?
For technical support, including SMBJ85CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHE3_B/H requirements.
6.How does Aetrix verify that SMBJ85CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHE3_B/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 SMBJ85CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHE3_B/H?
All SMBJ85CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHE3_B/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 SMBJ85CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMBJ85CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHE3_B/H Tags
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