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Vishay General Semiconductor - Diodes Division SMBJ85CAHE3/5B
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- Part No.:
- SMBJ85CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHE3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,252
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Product details
Overview
SMBJ85CAHE3/5B 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 signal or power 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), commonly deployed to protect MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ85CAHE3/5B datasheet, SMBJ85CAHE3/5B pinout, SMBJ85CAHE3/5B application, or SMBJ85CAHE3/5B equivalent, key selection criteria include bidirectional surge clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for suppressing ESD and inductive switching spikes before downstream ICs are damaged.
The SMBJ85CAHE3/5B is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and derates linearly above 25 °C ambient per Figure 2. Junction temperature remains within safe limits up to +150 °C, supported by RθJL = 20 °C/W to lead and MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below circuit rail voltage. |
| VBR min/max | 94.4 V / 104 V - Breakdown voltage range at 1 mA test current; ensures reliable conduction onset during overvoltage events. |
| VC @ IPPM | 137 V - Clamped voltage at 4.4 A peak pulse current; determines worst-case stress on protected components. |
| PPPM | 600 W - Peak pulse power handling (10/1000 µs); supports robust protection against lightning-induced surges and relay coil flyback. |
| IPPM | 4.4 A - Peak pulse current capacity; sets minimum surge energy absorption capability under standardized waveform. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient environments such as automotive engine bays or industrial enclosures. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient; informs PCB copper pad sizing requirements for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional mode | Enables clamping during either polarity of transient; no dedicated anode/cathode orientation required in layout. |
| Cathode | Current exit terminal in forward bias; symmetrical with anode in bidirectional mode | Provides identical clamping threshold in both directions; eliminates need for directional placement on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in ADAS and body control modules. |
| 600 W peak pulse power (10/1000 µs) | Handles high-energy transients from inductive load switching without degradation, supporting IEC 61000-4-5 Level 3 compliance. |
| Low profile SMB package | 0.220" × 0.155" footprint with 0.086" height-fits dense layouts and supports high-speed automated pick-and-place assembly. |
| MSL Level 1, 260 °C reflow compatible | Eliminates pre-baking requirement and allows standard lead-free reflow profiles-reduces manufacturing complexity and cost. |
| Glass passivated junction | Ensures stable leakage performance and long-term reliability under repeated surge stress-critical for mission-critical industrial systems. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and current-sense amplifiers against flyback voltage from relay coils and solenoids. IC Role / Device Role: Bidirectional voltage clamp limiting transient excursions to ≤137 V during 4.4 A surges. Use Value: Prevents latch-up or permanent damage to 100 V-rated MOSFETs and precision op-amps exposed to >1 kV inductive spikes. |
Use Scenario: Surge suppression on LIN bus and sensor supply lines in door modules and seat controllers. IC Role / Device Role: Transient voltage suppressor absorbing ISO 7637-2 Pulse 1 and Pulse 2a energy without failure. Use Value: Maintains communication integrity and prevents microcontroller resets during battery load dump and jump-start events. |
| Telecom Power Interfaces | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection for AC-DC adapters and PoE injectors subjected to lightning-induced surges. IC Role / Device Role: Primary clamping element diverting surge current away from bridge rectifiers and primary-side controllers. Use Value: Enables UL 60950-1 and IEC 61000-4-5 compliance with single-device solution and minimal board space. |
Use Scenario: Overvoltage safeguard for microcontroller I/O pins connected to pushbuttons, potentiometers, and display backlights. IC Role / Device Role: Low-leakage (≤1.0 µA at 85 V) bidirectional clamp preventing ESD damage during user interaction. Use Value: Eliminates need for separate unidirectional TVS diodes per line-reduces BOM count and improves field failure rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose SMBJ85CA-M3/5B if halogen-free bill-of-materials is required; otherwise SMBJ85CAHE3/5B offers same performance with standard RoHS compliance. |
| SMCJ85CAHE3/5B | Same VWM/VC ratings but in larger SMC (DO-214AB) package with 1500 W PPPM and higher IPPM (10.3 A). | Used where higher surge energy handling is needed-e.g., main DC input rails versus secondary signal lines. | Select SMBJ85CAHE3/5B for space-constrained signal-level protection; choose SMCJ85CAHE3/5B only when >600 W surge margin is required and PCB area permits larger footprint. |
Compared with SMBJ85CA-M3/5B, the SMBJ85CAHE3/5B provides identical clamping performance and automotive qualification but uses standard RoHS-compliant materials instead of halogen-free compounds; versus SMCJ85CAHE3/5B, it trades 2.5× lower surge power for 40% smaller PCB area-making it optimal for compact sensor interface and low-power control applications.
Availability
SMBJ85CAHE3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply and AEC-Q101-qualified surge protection.
Supply support for SMBJ85CAHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where repeatable clamping accuracy and long-term stability under surge stress are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ85CAHE3/5B?
The "CA" suffix denotes a bidirectional configuration, meaning the SMBJ85CAHE3/5B clamps voltage transients equally in both polarities. Unlike unidirectional variants (e.g., SMBJ85A), it has no cathode band marking and provides symmetric breakdown behavior-ideal for AC-coupled lines or differential buses where polarity reversal may occur during fault conditions. This design eliminates orientation constraints during PCB assembly.
Is SMBJ85CAHE3/5B suitable for automotive applications?
Yes, SMBJ85CAHE3/5B is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per JESD22-A114. Its -55 °C to +150 °C operating range, MSL Level 1 reflow rating, and validated surge performance make it appropriate for under-hood and cabin-mounted automotive subsystems such as lighting controllers and HVAC actuators-provided layout follows Vishay's recommended 0.2" × 0.2" copper pad dimensions.
How does the clamping voltage of SMBJ85CAHE3/5B compare to its stand-off voltage?
The SMBJ85CAHE3/5B has a VWM of 85 V and a maximum clamping voltage VC of 137 V at 4.4 A IPPM, resulting in a clamping ratio of ~1.61. This margin ensures protected circuits remain below their absolute maximum ratings during surge events-for example, preserving the integrity of 150 V-rated MOSFETs while allowing sufficient headroom for normal operating transients without false triggering.
What is the significance of the "HE3" suffix in SMBJ85CAHE3/5B?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification and standard (non-halogen-free) molding compound. It distinguishes this variant from "HM3" (halogen-free + AEC-Q101) and "E3" (RoHS-only, commercial grade). The HE3 designation confirms that SMBJ85CAHE3/5B meets both environmental compliance and automotive reliability standards-critical for Tier 1 suppliers validating full-system compliance.
Can SMBJ85CAHE3/5B be used in place of a unidirectional TVS like SMBJ85A?
No-SMBJ85CAHE3/5B is not a drop-in replacement for unidirectional SMBJ85A because it lacks polarity marking and conducts in both directions. Substituting it on a DC line with defined anode/cathode routing risks unintended conduction during normal operation. Use SMBJ85CAHE3/5B only where bidirectional clamping is explicitly required, such as across AC inputs, differential data lines, or floating sensor bridges-not on polarized power rails.
SMBJ85CAHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85CAHE3/5B FAQ
1.How can I place an order for SMBJ85CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHE3/5B 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 SMBJ85CAHE3/5B reliable?
The price and inventory of SMBJ85CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHE3/5B?
SMBJ85CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHE3/5B 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 SMBJ85CAHE3/5B?
For technical support, including SMBJ85CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ85CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHE3/5B 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 SMBJ85CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHE3/5B?
All SMBJ85CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHE3/5B, 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 SMBJ85CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ85CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHE3/5B Tags
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