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Vishay General Semiconductor - Diodes Division SMBJ8.5C-E3/5B
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- Part No.:
- SMBJ8.5C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5C-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,438
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Product details
Overview
SMBJ8.5C-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power rails and signal lines. It features 600 W peak pulse power (10/1000 µs), 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR at 1 mA), and clamps to ≤14.4 V at 41.7 A peak surge current - deployed in automotive body control modules, industrial sensor interfaces, and USB power input protection.
For engineers reviewing the SMBJ8.5C-E3/5B datasheet, SMBJ8.5C-E3/5B pinout, SMBJ8.5C-E3/5B application, or SMBJ8.5C-E3/5B equivalent, key selection criteria include unidirectional polarity, 14.4 V maximum clamping voltage at rated IPPM, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry. Its glass-passivated junction enables fast response (<1 ns), low incremental surge resistance (Rdyn ≈ 0.34 Ω derived from ΔVC/ΔIPPM), and stable breakdown behavior under repetitive 0.01% duty cycle surges.
It is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient, on recommended pad layout) and 20 °C/W (junction-to-lead). The cathode band denotes polarity; no marking is used for bidirectional variants - but SMBJ8.5C-E3/5B is unidirectional per suffix "C" and marking code "AT".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before leakage exceeds 20 µA; sets upper limit for normal operation without conduction. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - guaranteed breakdown onset range; ensures predictable clamping initiation across production lot. |
| VC @ IPPM | ≤14.4 V at 41.7 A - maximum clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected IC. |
| PPPM | 600 W - peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted. |
| IFSM | 100 A - non-repetitive forward surge rating (8.3 ms half-sine); supports protection during high-energy load dump events. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., GND or return path); must be routed with low-inductance trace for effective surge shunting. |
| Cathode | Current exit terminal; marked with band | Connected to protected line (e.g., 12 V rail or signal input); band orientation confirms polarity during automated optical inspection (AOI). |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements up to 4 kV in system-level testing. |
| Clamping voltage ≤14.4 V at 41.7 A | Ensures protected 3.3 V or 5 V logic ICs remain below absolute maximum ratings during transient events. |
| Glass passivated junction | Provides stable VBR tolerance (±5%), low leakage (<20 µA at VWM), and long-term reliability under thermal cycling. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning risk. |
| RoHS-compliant, matte tin terminations | Meets J-STD-002 solderability and JESD22-B102 whisker resistance Class 2; supports high-yield SMT manufacturing. |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of BCM microcontroller from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, clamping surges within nanoseconds before they reach LDO regulators. Use Value: Limits voltage excursion to ≤14.4 V, preventing latch-up or gate oxide damage in downstream 3.3 V MCU and CAN transceivers. |
Use Scenario: Shields RS-485 driver/receiver ICs from ESD (IEC 61000-4-2 ±8 kV contact) and cable-induced surges. IC Role / Device Role / Timing Role: Placed on both A and B differential lines with GND reference; operates in reverse-bias clamp mode during overvoltage. Use Value: Maintains signal integrity by clamping transients below 14.4 V while adding <1 pF junction capacitance - no data rate degradation at 10 Mbps. |
| USB Type-C VBUS Line Protection | Smart Meter AC/DC Power Supply Input |
Use Scenario: Guards 5 V VBUS line against hot-plug overshoot, ESD, and cross-talk from adjacent CC or D+/D- lines. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-GND, cathode-to-VBUS; activated only during overvoltage, not during normal 5 V operation. Use Value: Achieves <20 µA leakage at 5 V, preserving battery life in portable devices while clamping 10/1000 µs surges to safe levels. |
Use Scenario: Installed across primary-side rectifier output to absorb switching spikes and lightning-induced surges in meter power supplies. IC Role / Device Role / Timing Role: Mounted directly across bulk capacitor terminals; absorbs energy before it propagates to secondary-side regulation circuitry. Use Value: Handles 100 A single-half-sine surge (8.3 ms), enabling compliance with IEC 61000-4-5 Level 3 (2 kV differential mode) without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-E3/5B | Same VWM (8.5 V), identical package and clamping (≤14.4 V), but unidirectional with standard "A" suffix instead of "C" - no functional difference; "C" denotes Vishay's internal revision/certification variant. | No difference in circuit function or layout; both meet same AEC-Q101 qualification when ordered with HE3 suffix. | Select SMBJ8.5C-E3/5B when traceability to Vishay's latest revision (Revision 09-Jan-2024, Doc #88392) and commercial-grade RoHS compliance are required. |
| SMAJ8.5A-E3/61 | Lower peak pulse power (400 W vs. 600 W), larger VC (≤15.0 V), and SMA (DO-214AC) package - smaller thermal mass and higher RθJA (140 °C/W). | Not suitable for high-energy surges (e.g., automotive load dump); limited to consumer electronics with lower IEC 61000-4-5 test levels. | Choose SMAJ8.5A-E3/61 only for space-constrained, low-power applications where 400 W surge rating suffices and PCB real estate is critical. |
Compared with SMBJ8.5A-E3/5B, SMBJ8.5C-E3/5B offers identical electrical performance with updated documentation traceability; versus SMAJ8.5A-E3/61, it delivers 50% higher surge energy handling and superior thermal dissipation in the same board area - critical for industrial and automotive deployments.
Availability
SMBJ8.5C-E3/5B is available at Aetrix Electronics and suitable for automotive body control modules, industrial RS-485 networks, and smart meter power supplies requiring stable component supply, full RoHS compliance, and MSL Level 1 reflow readiness.
Supply support for SMBJ8.5C-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, MOSFETs, optoelectronics, and passive components - with emphasis on high-reliability, AEC-Q qualified devices for automotive and industrial markets.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient suppression in harsh environments - targeting design-in for automotive ECUs, industrial PLCs, and telecom infrastructure where failure modes must be mitigated at the board level.
FAQ
What is the maximum clamping voltage of SMBJ8.5C-E3/5B at its rated peak pulse current?
The SMBJ8.5C-E3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 41.7 A under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C on 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events - ensuring compatibility with 12 V systems and downstream 3.3 V/5 V ICs.
Is SMBJ8.5C-E3/5B unidirectional or bidirectional, and how is polarity identified?
SMBJ8.5C-E3/5B is a unidirectional TVS diode, indicated by the "C" suffix and marking code "AT" per Vishay's ordering nomenclature. Polarity is identified by a visible cathode band on the SMB (DO-214AA) package - the banded end connects to the protected line (cathode), while the unbanded end connects to ground (anode). Bidirectional variants use "CA" suffix and carry no polarity marking.
Does SMBJ8.5C-E3/5B meet automotive qualification standards?
SMBJ8.5C-E3/5B itself is RoHS-compliant commercial grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under ordering codes such as SMBJ8.5CHE3_B/I. The base SMBJ8.5C-E3/5B is not AEC-Q101 certified; however, its construction - including glass-passivated junction, MSL Level 1 rating, and -55 °C to +150 °C operating range - aligns with foundational automotive stress requirements when paired with appropriate system-level validation.
What is the thermal resistance of SMBJ8.5C-E3/5B, and how does it affect layout?
SMBJ8.5C-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, PCB layout must replicate this pad area - undersized pads increase RθJA, risking thermal runaway during high-duty-cycle transients. Junction-to-lead resistance is 20 °C/W, supporting localized heat extraction via wide traces.
Can SMBJ8.5C-E3/5B replace SMBJ8.5A-E3/5B in existing designs?
Yes, SMBJ8.5C-E3/5B is a direct functional replacement for SMBJ8.5A-E3/5B: both share identical electrical specifications (VWM = 8.5 V, VBR = 9.44–10.4 V, VC ≤ 14.4 V, PPPM = 600 W), SMB package dimensions, and RoHS-compliant matte tin terminations. The "C" suffix reflects Vishay's updated revision status (Doc #88392, Rev 09-Jan-2024) and does not alter pinout, footprint, or performance - no PCB or firmware changes are needed.
SMBJ8.5C-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 37.7A
- 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)
SMBJ8.5C-E3/5B FAQ
1.How can I place an order for SMBJ8.5C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5C-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 SMBJ8.5C-E3/5B reliable?
The price and inventory of SMBJ8.5C-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 SMBJ8.5C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5C-E3/5B?
SMBJ8.5C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5C-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 SMBJ8.5C-E3/5B?
For technical support, including SMBJ8.5C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5C-E3/5B requirements.
6.How does Aetrix verify that SMBJ8.5C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5C-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 SMBJ8.5C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5C-E3/5B?
All SMBJ8.5C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5C-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 SMBJ8.5C-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5C-E3/5B Tags
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