My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ85CA-E3/52
;;2.jpg)
- Part No.:
- SMBJ85CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CA-E3/52.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,835
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ85CA-E3/52 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 and 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), protecting MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ85CA-E3/52 datasheet, SMBJ85CA-E3/52 pinout, SMBJ85CA-E3/52 application, or SMBJ85CA-E3/52 equivalent, key selection considerations include bidirectional clamping capability, low incremental surge resistance, thermal derating above 25 °C, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SMBJ85CA-E3/52 operates as a bidirectional avalanche diode, exhibiting symmetrical breakdown behavior in both polarities with a minimum breakdown voltage (VBR) of 94.4 V and maximum of 104 V at 1 mA test current. Its clamping action limits transient-induced overvoltage to ≤137 V under 4.4 A 10/1000 µs surge conditions, enabling robust protection of downstream ICs without forward conduction path dependency.
Thermally, it delivers 5.0 W steady-state power dissipation at 50 °C ambient on an infinite heatsink, with junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. The device meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC signal line operating margin. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Bidirectional breakdown threshold range; ensures reliable turn-on during polarity-reversing transients. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage under standardized 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capacity; enables suppression of high-energy lightning or inductive-switching surges. |
| IPPM | 4.4 A - Peak surge current supported at VC; correlates directly with PCB trace width and pad thermal design. |
| TJ max. | +150 °C - Maximum junction temperature; sets upper limit for ambient + self-heating in enclosed industrial enclosures. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise under sustained power dissipation. |
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), matte tin-plated leads, RoHS-compliant (E3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative-going transients; connects to protected line or ground return path. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge current during positive-going transients; symmetric role to Anode in bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) when properly laid out with 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot relative to breakdown threshold, reducing stress on 100 V-rated MOSFETs and gate drivers. |
| MSL Level 1, 260 °C peak reflow | Permits standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| 150 °C maximum junction temperature | Allows operation in sealed industrial enclosures with ambient temperatures up to +85 °C and moderate power dissipation. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Protection of encoder feedback lines and Hall-effect sensor supply rails against inductive kickback from nearby contactors and solenoids. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and chassis ground, absorbing ±1 kV transients induced by relay switching. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V analog front-end ICs while maintaining signal integrity below 100 MHz bandwidth. |
Use Scenario: ESD and load-dump protection on LIN bus transceivers and pressure sensor outputs in engine control modules. IC Role / Device Role / Timing Role: Primary transient suppressor on bidirectional LIN data line, rated for ISO 16750-2 load dump (±120 V, 400 ms) and ISO 10605 ESD (±30 kV air). Use Value: Maintains LIN communication integrity during battery disconnection events without requiring series impedance or additional filtering components. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Overvoltage suppression on 48 V PoE (Power over Ethernet) injectors and splitters exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS on DC input rail upstream of DC/DC converters, clamping transients before they reach isolation barriers. Use Value: Limits peak voltage to <140 V, ensuring compliance with IEEE 802.3bt Type 4 (90 W) surge immunity requirements. |
Use Scenario: Bidirectional transient protection on USB-C CC and VCONN lines susceptible to hot-plug ESD and cable coupling noise. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS placed directly at connector, shunting fast-rising ESD pulses before reaching USB PD controller. Use Value: Achieves >15 kV contact ESD immunity (IEC 61000-4-2) without distorting 5 Gbps USB 3.2 Gen 2 signaling due to symmetric clamping and minimal parasitic capacitance. |
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-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same thermal and clamping performance. | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy. | Choose SMBJ85CA-M3/52 when halogen-free certification (e.g., IEC 61249-2-21) is required for final product compliance. |
| SMCJ85CA-E3/52 | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM and 12.3 A IPPM. | Higher surge capacity suits mains-connected equipment; requires larger PCB footprint and different pad layout. | Choose SMCJ85CA-E3/52 when system-level surge testing exceeds 600 W (e.g., IEC 61000-4-5 combination wave 6 kV/3 kA). |
Compared with SMBJ85CA-E3/52, SMBJ85CA-M3/52 offers identical protection performance with halogen-free construction, while SMCJ85CA-E3/52 provides 2.5× higher surge energy handling at the cost of increased board area and thermal mass-making each suitable for distinct mechanical and compliance-driven design constraints.
Availability
SMBJ85CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, and telecom power feeds requiring stable component supply, RoHS compliance, and MSL Level 1 SMT process support.
Supply support for SMBJ85CA-E3/52 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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in space-constrained applications, targeting industrial automation, automotive electronics, and communications infrastructure where compact, bidirectional clamping is essential.
FAQ
What is the maximum clamping voltage of SMBJ85CA-E3/52 under surge conditions?
The SMBJ85CA-E3/52 has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by protected circuitry during transient events. The SMBJ85CA-E3/52 maintains this clamping performance across its full operating temperature range from -55 °C to +150 °C.
Is SMBJ85CA-E3/52 suitable for automotive applications?
SMBJ85CA-E3/52 is not AEC-Q101 qualified; it is commercial-grade (E3 suffix). For automotive use, Vishay offers the SMBJ85CAHE3_B/H variant, which carries AEC-Q101 qualification and extended temperature validation. The SMBJ85CA-E3/52 may be used in non-safety-critical consumer or industrial systems but must not be deployed in automotive ECUs, ADAS sensors, or powertrain modules without formal qualification evidence. Always verify compliance with OEM-specific stress test requirements before selecting SMBJ85CA-E3/52.
How does the bidirectional nature of SMBJ85CA-E3/52 affect its PCB layout?
The SMBJ85CA-E3/52 has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating cathode/anode orientation checks during placement. It should be mounted with symmetric 5.0 mm × 5.0 mm copper pads per terminal to achieve specified thermal and surge performance. Unlike unidirectional TVS diodes, no series blocking diode or directional routing is needed-making SMBJ85CA-E3/52 ideal for AC signal lines, differential buses, and floating grounds where voltage polarity reverses.
What is the thermal resistance of SMBJ85CA-E3/52, and how does it impact power dissipation?
The SMBJ85CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. At 50 °C ambient, its steady-state power dissipation rating is 5.0 W on an infinite heatsink. In real-world layouts, thermal performance depends heavily on copper area: using the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) pads improves heat spreading, while insufficient copper will cause premature thermal shutdown or reduced surge endurance. The SMBJ85CA-E3/52 must be derated linearly above 25 °C ambient per Figure 2 in the datasheet.
Can SMBJ85CA-E3/52 replace SMBJ85A-E3/52 in a design?
No-SMBJ85CA-E3/52 and SMBJ85A-E3/52 are functionally distinct: the "CA" suffix denotes bidirectional operation, while "A" indicates unidirectional. Replacing one with the other without circuit review risks failure. SMBJ85A-E3/52 conducts only in reverse bias and requires correct cathode orientation; SMBJ85CA-E3/52 clamps in both directions and has no polarity marking. Using SMBJ85CA-E3/52 in place of SMBJ85A-E3/52 on a DC line may cause unintended conduction. Always validate schematic symbol, footprint polarity, and transient directionality before substitution.
SMBJ85CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85CA-E3/52 FAQ
1.How can I place an order for SMBJ85CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CA-E3/52 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 SMBJ85CA-E3/52 reliable?
The price and inventory of SMBJ85CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CA-E3/52?
SMBJ85CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CA-E3/52 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 SMBJ85CA-E3/52?
For technical support, including SMBJ85CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ85CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85CA-E3/52 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 SMBJ85CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85CA-E3/52?
All SMBJ85CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CA-E3/52, 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 SMBJ85CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ85CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CA-E3/52 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
