My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ85C-E3/5B
;;2.jpg)
- Part No.:
- SMBJ85C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85C-E3/5B.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ85C-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V clamping voltage (VC) at 4.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ85C-E3/5B datasheet, SMBJ85C-E3/5B pinout, SMBJ85C-E3/5B application, or SMBJ85C-E3/5B equivalent, key selection criteria include clamping performance under 4.4 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping-type protector: when reverse voltage exceeds VWM = 85 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB pad design for sustained 5.0 W power dissipation.
The device complies with ANSI/IEEE C62.35 standards for surge suppression and meets J-STD-020 MSL Level 1 moisture sensitivity. It is rated for -55 °C to +150 °C operating junction temperature and supports repetitive surges at 0.01 % duty cycle - critical for protecting MOSFET gate drivers and RS-485 transceivers against inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 72–85 V DC bus applications. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 137 V at 4.4 A - clamped voltage during full 600 W surge; determines maximum stress imposed on downstream ICs like microcontrollers or ADCs. |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; validates protection capability against lightning-induced surges per IEC 61000-4-5. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; dictates derating above 25 °C ambient for reliable long-term operation. |
| IFSM | 100 A - non-repetitive forward surge current (8.3 ms half-sine); supports protection of rectifier stages against AC line faults. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected circuit's lower-potential node (e.g., GND or return path). | Enables unidirectional clamping from cathode to anode; must be tied to system ground or common reference for effective transient shunting. |
| Cathode | Current exit point in forward bias; marked by band; connected to protected line (e.g., 85 V rail or signal trace). | Defines polarity-sensitive placement - reversal causes permanent failure under normal bias; band aligns with PCB silkscreen indicator. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates immunity to severe transients including IEC 61000-4-5 Level 4 surges without degradation over rated lifetime. |
| Clamping voltage ≤137 V at 4.4 A | Ensures downstream 100 V-rated components (e.g., logic-level MOSFETs) remain within absolute maximum ratings during surge events. |
| Glass passivated junction | Delivers stable VBR tolerance (±5 % typical), low leakage (<1 µA), and enhanced reliability in humid or high-bias environments. |
| MSL Level 1, peak reflow 260 °C | Supports single-pass lead-free reflow without popcorn effect or delamination - compatible with standard SMT assembly lines. |
| RoHS-compliant, matte tin terminations | Meets IPC-J-STD-002B solderability requirements and eliminates whisker risk per JESD 201 Class 2, ensuring long-term interconnect integrity. |
Applications
| Industrial Motor Drives | Telecom Interface Protection |
|---|---|
|
Use Scenario: Protecting gate driver ICs and bootstrap circuits from inductive kickback during IGBT/MOSFET switching in 48–100 V DC bus systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between high-side gate and source/negative rail to clamp negative-going transients. Use Value: Limits gate-source voltage to ≤137 V, preventing oxide breakdown in 100 V-rated SiC MOSFET drivers while maintaining <1 ns response time. |
Use Scenario: Safeguarding RS-485 transceiver data lines (A/B) against ESD and lightning-induced surges in outdoor base stations and remote IO modules. IC Role / Device Role / Timing Role: Line-to-ground TVS on each differential pair, referenced to local chassis ground to absorb common-mode transients. Use Value: Clamps 600 W surges to <137 V within nanoseconds, preserving signal integrity and preventing latch-up in ±12 V tolerant transceivers. |
| Power Supply Input Stage | Automotive Body Control Modules |
|
Use Scenario: Secondary-side overvoltage protection on 85 V auxiliary supplies feeding infotainment or ADAS subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS across input capacitor to clamp surges from load dump or alternator regulation faults. Use Value: Withstands 100 A IFSM, enabling robust protection against 12 V system load-dump transients without fuse coordination issues. |
Use Scenario: Protecting LIN bus transceivers and sensor inputs (e.g., ambient temp, rain sensor) in body control units exposed to battery transients. IC Role / Device Role / Timing Role: Unidirectional TVS from LIN line to ground, leveraging 85 V VWM to tolerate 14 V nominal + 25 V load dump peaks. Use Value: Meets AEC-Q101 qualification when ordered as HE3 variant; this E3 version provides commercial-grade cost/performance balance for non-safety-critical nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-E3/5B | Same VWM (85 V), identical package and clamping (137 V), but unidirectional with cathode band - matches SMBJ85C-E3/5B's electrical specs exactly. | No functional difference; "C" suffix denotes same unidirectional configuration - "C" and "A" are interchangeable per Vishay documentation for this family. | Select SMBJ85A-E3/5B if legacy BOMs or distributor stock use "A" suffix; no design or layout change required. |
| SMCJ85A-E3/57T | Higher power rating (1500 W), larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), same VWM/VC but 10.3 A IPPM. | Used where higher surge repetition or longer duration transients demand greater energy absorption - not drop-in due to footprint mismatch. | Choose only if 600 W is insufficient and PCB layout allows SMC footprint; otherwise, SMBJ85C-E3/5B offers optimal size/power density for space-constrained designs. |
Compared with SMBJ85A-E3/5B, the SMBJ85C-E3/5B is electrically identical and mechanically interchangeable; compared with SMCJ85A-E3/57T, it trades surge capacity for 40 % smaller board area and lower thermal mass - making it preferable for compact, cost-sensitive consumer and industrial controls where 600 W compliance suffices.
Availability
SMBJ85C-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom interface protection, and automotive body control modules requiring stable component supply, RoHS compliance, and SMT-ready packaging.
Supply support for SMBJ85C-E3/5B 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-efficiency transient suppression in space-constrained, high-reliability applications - balancing clamping performance, thermal robustness, and automated manufacturability in consumer, industrial, and telecom systems.
FAQ
What is the clamping voltage of SMBJ85C-E3/5B and how is it measured?
The SMBJ85C-E3/5B has a maximum clamping voltage (VC) of 137 V, measured at a peak pulse current (IPPM) of 4.4 A using a 10/1000 µs waveform. This value is specified in the Vishay datasheet (Document Number: 88392, page 2) and represents the upper voltage limit imposed on protected circuitry during a standardized surge event - critical for verifying compatibility with downstream component voltage ratings.
Is SMBJ85C-E3/5B unidirectional or bidirectional, and how is polarity identified?
SMBJ85C-E3/5B is a unidirectional TVS diode, indicated by the "C" suffix and confirmed by its cathode band marking on the SMB package. The band denotes the cathode terminal, which must be connected to the line being protected (e.g., 85 V rail), while the anode connects to ground or return. Bidirectional variants use "CA" suffix (e.g., SMBJ85CA) and lack polarity marking.
Does SMBJ85C-E3/5B meet automotive qualification standards?
The SMBJ85C-E3/5B is RoHS-compliant and commercial-grade (E3 suffix), but not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMBJ85CHE3 variant (HE3 suffix), which shares identical electrical specs but adds AEC-Q101 validation - essential for body control, lighting, or infotainment modules in production vehicles.
What is the thermal resistance and power derating behavior of SMBJ85C-E3/5B?
SMBJ85C-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. Its 5.0 W steady-state power dissipation derates linearly above 25 °C ambient, reaching zero at 75 °C - per Figure 2 in the Vishay datasheet. This requires thermal-aware PCB layout for continuous operation near rated power.
Can SMBJ85C-E3/5B replace SMBJ85A-E3/5B in an existing design?
Yes - SMBJ85C-E3/5B and SMBJ85A-E3/5B are functionally identical unidirectional TVS diodes with matching VWM, VBR, VC, and package. Vishay documentation confirms "A" and "C" suffixes denote the same unidirectional configuration in the SMBJ family; no schematic or layout changes are needed for substitution.
SMBJ85C-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 151V
- Current - Peak Pulse (10/1000µs):
- 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)
SMBJ85C-E3/5B FAQ
1.How can I place an order for SMBJ85C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85C-E3/5B 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 SMBJ85C-E3/5B reliable?
The price and inventory of SMBJ85C-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85C-E3/5B?
SMBJ85C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85C-E3/5B 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 SMBJ85C-E3/5B?
For technical support, including SMBJ85C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85C-E3/5B requirements.
6.How does Aetrix verify that SMBJ85C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85C-E3/5B 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 SMBJ85C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85C-E3/5B?
All SMBJ85C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85C-E3/5B, 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 SMBJ85C-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ85C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85C-E3/5B 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 …
