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Vishay General Semiconductor - Diodes Division SMBJ85CAHE3_A/H
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- Part No.:
- SMBJ85CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHE3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
SMBJ85CAHE3_A/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 signal or power lines. It features 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), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ85CAHE3_A/H datasheet, SMBJ85CAHE3_A/H pinout, SMBJ85CAHE3_A/H application, or SMBJ85CAHE3_A/H 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 standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped transient 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 components are damaged.
The SMBJ85CAHE3_A/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Its AEC-Q101 qualification confirms suitability for automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 94.4 V min. / 104 V max. at 1 mA - Confirmed bidirectional avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 137 V at IPPM = 4.4 A (10/1000 µs) - Peak voltage seen by protected circuit under standardized surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Maximum transient energy absorption capability; supports robust protection against IEC 61000-4-5 level 4 surges. |
| ID (Reverse Leakage) | 1.0 µA max. at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or high-temperature industrial environments without derating. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); molded compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction between terminals; either side connects to protected line, other to ground or reference rail. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports high-energy surge suppression without degradation across ≥10⁴ cycles at 0.01% duty cycle. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring extended temperature and life-cycle reliability. |
| Glass passivated chip junction | Ensures stable breakdown characteristics and long-term parameter stability under thermal cycling and humidity exposure. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-induced popcorn failure or delamination. |
| Low profile SMB package | Reduces board space vs. SMA/SMB alternatives while maintaining 600 W rating; compatible with high-speed pick-and-place systems. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly across protected signal/power node and ground. Use Value: Limits transient voltage to ≤137 V during 4.4 A surges, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-clamp protector with 85 V VWM matching typical 12 V automotive system nominal voltage. Use Value: AEC-Q101 qualification ensures compliance with ISO 7637-2 pulse 1/2a/5a test profiles without derating. |
| Telecom Power Supply Inputs | Consumer Sensor Signal Conditioning |
Use Scenario: Input-stage protection for AC/DC adapters and PoE injectors subject to lightning-induced surges on primary-side DC rails. IC Role / Device Role / Timing Role: Primary-line TVS connected between input rail and chassis ground to shunt surge current away from upstream rectifiers. Use Value: 600 W PPPM rating handles IEC 61000-4-5 combination wave (1.2/50 µs voltage, 8/20 µs current) up to level 4. |
Use Scenario: ESD protection for analog outputs of temperature/humidity sensors interfacing with microcontrollers via 0–3.3 V ADC inputs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed at sensor output pin to suppress ±8 kV contact discharge per IEC 61000-4-2. Use Value: 1.0 µA max. ID at 85 V VWM avoids loading high-impedance sensor outputs; fast response prevents ESD-induced latch-up. |
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-E3/52 | Same electrical specs and SMB package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for industrial/commercial designs where extended reliability testing is not required. | Select when cost sensitivity outweighs need for automotive-grade validation and lifecycle assurance. |
| SMCJ85CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package with 1500 W PPPM rating and lower RθJA (50 °C/W). | Higher power handling and better thermal performance; requires larger PCB footprint and different pad layout. | Choose when surge threat level exceeds 600 W or ambient temperatures exceed 100 °C with limited heatsinking. |
Compared with SMBJ85CAHE3_A/H, SMBJ85CA-E3/52 offers identical clamping performance at lower cost but no automotive qualification, while SMCJ85CAHE3_A/H delivers 2.5× higher surge power capacity in a physically larger package-requiring layout revision but enabling use in harsher thermal or higher-energy environments.
Availability
SMBJ85CAHE3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply with AEC-Q101 traceability and full production lot traceability.
Supply support for SMBJ85CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-reliability transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom systems where consistent clamping behavior and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ85CAHE3_A/H at its rated peak pulse current?
The SMBJ85CAHE3_A/H has a maximum clamping voltage (VC) of 137 V when subjected to its specified peak pulse current (IPPM) of 4.4 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the upper voltage limit imposed on protected circuitry during transient events. The SMBJ85CAHE3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal drift.
Is SMBJ85CAHE3_A/H suitable for automotive applications?
Yes, SMBJ85CAHE3_A/H is AEC-Q101 qualified, confirming its suitability for automotive applications including body electronics, infotainment systems, and ADAS sensor interfaces. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction. Its 150 °C maximum junction temperature, MSL Level 1 reflow rating, and validated life-cycle performance meet stringent automotive reliability requirements without derating.
How does the bidirectional configuration of SMBJ85CAHE3_A/H affect its circuit implementation?
The SMBJ85CAHE3_A/H has no polarity marking and functions identically in both directions, making it ideal for AC-coupled lines, differential buses (e.g., LIN, RS-485), or any node where voltage polarity reversal may occur. Unlike unidirectional TVS diodes, it eliminates the need for orientation verification during placement and provides symmetrical protection against positive and negative transients without additional components or layout constraints.
What is the thermal resistance of SMBJ85CAHE3_A/H, and how does it impact layout design?
The SMBJ85CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and dictates minimum copper area requirements for sustained surge duty. To maintain TJ ≤ 150 °C under repetitive 600 W pulses, designers must ensure adequate copper pour and avoid excessive trace length between the SMBJ85CAHE3_A/H and ground plane.
Does SMBJ85CAHE3_A/H require external current limiting resistors in series?
No, SMBJ85CAHE3_A/H does not require external series current-limiting resistors because it operates as a voltage-clamping device that self-limits surge current based on its dynamic impedance. Its low incremental surge resistance (calculated from VC/IPPM ≈ 31 Ω) ensures effective energy diversion without added components. However, designers should verify that the protected circuit's source impedance and trace inductance do not generate overshoot exceeding the SMBJ85CAHE3_A/H's 137 V clamping limit during fast-rising transients.
SMBJ85CAHE3_A/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:
- 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/H FAQ
1.How can I place an order for SMBJ85CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHE3_A/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_A/H reliable?
The price and inventory of SMBJ85CAHE3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHE3_A/H?
SMBJ85CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHE3_A/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_A/H?
For technical support, including SMBJ85CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ85CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHE3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHE3_A/H?
All SMBJ85CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHE3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ85CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHE3_A/H Tags
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