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Vishay General Semiconductor - Diodes Division SMBJ70CA-E3/5B
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- Part No.:
- SMBJ70CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CA-E3/5B.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
SMBJ70CA-E3/5B 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 power and signal lines. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 5.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ70CA-E3/5B datasheet, SMBJ70CA-E3/5B pinout, SMBJ70CA-E3/5B application, or SMBJ70CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical electrical characteristics in forward and reverse directions per ANSI/IEEE C62.35. Its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress, while low incremental surge resistance enables rapid energy absorption without thermal runaway.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and is RoHS-compliant per base P/N-E3 designation, with no marking on the case due to bidirectional polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 77.8–86.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 113 V at IPPM = 5.3 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W - Energy-handling capacity for standardized 10/1000 µs waveform; supports IEC 61000-4-5 level 4 compliance when properly mounted. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Minimal standby current ensures negligible power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Enables operation in high-temperature environments such as enclosed industrial enclosures or near power converters. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm max length, compatible with JEDEC MS-012AC footprint and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking on case; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied across the device. |
| Case (body) | Non-connected mechanical structure | No internal connection to silicon die; serves only as thermal and mechanical interface; requires no grounding or isolation design consideration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for orientation-aware layout and supports AC-coupled or floating signal lines. |
| 600 W peak pulse power | Validated with 10/1000 µs waveform at TA = 25 °C on 5.0 mm × 5.0 mm copper pads - meets IEC 61000-4-5 surge immunity requirements for industrial equipment. |
| Low clamping ratio (VC/VBR) | ≈1.45 (113 V / 77.8 V) - minimizes overvoltage exposure to downstream ICs compared to higher-ratio suppressors. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - allows direct placement without baking or dry-pack handling, reducing manufacturing overhead. |
| RoHS-compliant matte tin leads | Solderable per J-STD-002 and JESD 22-B102 - ensures reliable wetting and joint strength in lead-free reflow processes. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: Protecting primary-side DC bus inputs against lightning-induced surges and inductive switching transients in DIN-rail mounted 24 V/48 V power supplies. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input terminals to limit transient excursions to ≤113 V, safeguarding upstream rectifiers and downstream DC-DC controllers. Use Value: Prevents latch-up or gate oxide damage in MOSFET-based front-end switches by limiting overvoltage duration and amplitude within safe SOA limits. |
Use Scenario: Shielding Ethernet PHY interface power rails and bias lines in carrier-grade DSLAM and ONU line cards exposed to longitudinal surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing common-mode surges before they couple into sensitive analog front-end circuitry. Use Value: Maintains signal integrity and prevents reset events in PHY ICs by clamping transients within 1 ns response time and holding rail voltage within ±10 % of nominal. |
| Automotive Body Control Module (BCM) Sensor Inputs | Industrial PLC Analog Input Protection |
|
Use Scenario: Guarding LIN bus and resistive sensor inputs (e.g., temperature, pressure) in BCMs against load dump and ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Secondary-level protection staged after bulk filtering, providing precise clamping at 70 V to match 12 V system architecture. Use Value: Enables AEC-Q101-qualified variants (e.g., SMBJ70CAHE3_B/I) to meet automotive reliability standards without derating or additional series impedance. |
Use Scenario: Securing 4–20 mA current loop and 0–10 V analog inputs in programmable logic controllers against ESD and field-wiring faults in factory automation systems. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) shunt element that avoids loading precision reference paths while reacting to fast transients on field-connected terminals. Use Value: Preserves measurement accuracy (<0.1 % FS error) by introducing negligible parallel conductance at 70 V stand-off, unlike Zener-based alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same MSL Level 1 rating. | No difference in circuit function or layout; selected where halogen-free compliance is mandated by end-equipment environmental policy. | Choose SMBJ70CA-M3/5B when halogen-free materials are required for final product certification (e.g., EU EcoDesign). |
| SMAJ70CA-E3/52 | Lower PPPM (400 W vs. 600 W); SMA (DO-214AC) package with smaller footprint (4.57 mm × 2.79 mm) and higher RθJA (140 °C/W). | Reduced surge handling margin; suitable only for lower-energy threat environments (e.g., IEC 61000-4-2 ESD, not full IEC 61000-4-5 surge). | Select SMAJ70CA-E3/52 only if board space is constrained and surge threat level is limited to Class 3 or below. |
Compared with SMBJ70CA-E3/5B, the M3 variant offers identical protection performance with halogen-free construction, while the SMAJ70CA-E3/52 trades 33 % peak power capacity and thermal performance for 30 % smaller PCB area - making SMBJ70CA-E3/5B optimal for robust industrial surge immunity where space permits.
Availability
SMBJ70CA-E3/5B is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line card surge suppression, automotive body control module sensor inputs, and industrial PLC analog input protection requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ70CA-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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and AEC-Q qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial, automotive, and telecom applications where consistent clamping performance and long-term stability under thermal cycling are critical.
FAQ
What is the clamping voltage of SMBJ70CA-E3/5B at its rated peak pulse current?
The SMBJ70CA-E3/5B has a maximum clamping voltage (VC) of 113 V at its specified peak pulse current (IPPM) of 5.3 A using the 10/1000 µs waveform. This value is measured under standard test conditions with 0.2" × 0.2" copper pads per terminal and represents the upper voltage limit imposed on protected circuitry during a surge event. The SMBJ70CA-E3/5B maintains this clamping performance bidirectionally, ensuring consistent protection regardless of transient polarity.
Is SMBJ70CA-E3/5B suitable for automotive applications?
SMBJ70CA-E3/5B itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101-qualified versions under ordering codes like SMBJ70CAHE3_B/I. The SMBJ70CA-E3/5B shares identical electrical and thermal specifications with those qualified variants - only differing in traceability, burn-in, and test reporting. For non-safety-critical automotive subsystems where formal qualification is not mandated, SMBJ70CA-E3/5B may be used; however, certified designs require the HE3/HM3 suffix parts. Always verify with Vishay's automotive product documentation before deployment.
How does the bidirectional nature of SMBJ70CA-E3/5B affect PCB layout?
The SMBJ70CA-E3/5B has no polarity marking and functions identically in either orientation, eliminating orientation-dependent placement constraints. This simplifies PCB layout by allowing rotation-independent mounting and enabling use on AC-coupled or floating nodes without concern for anode/cathode alignment. Layout best practices still require symmetric 5.0 mm × 5.0 mm copper pads per terminal to maintain specified thermal and surge performance - but no silkscreen polarity indicator or directional routing is needed. The SMBJ70CA-E3/5B thus reduces assembly errors and supports automated optical inspection without polarity validation steps.
What is the maximum operating temperature for SMBJ70CA-E3/5B?
The SMBJ70CA-E3/5B has a maximum junction temperature (TJ max.) of +150 °C and an operating junction and storage temperature range of -55 °C to +150 °C. Its thermal resistance is 100 °C/W (junction-to-ambient) under standard mounting conditions, meaning it can sustain continuous power dissipation up to 5.0 W at 25 °C ambient - though actual derating must follow Figure 2 in the datasheet. At elevated ambient temperatures, the SMBJ70CA-E3/5B remains functional up to 125 °C ambient if power dissipation is reduced accordingly, supporting use in sealed enclosures or near heat-generating components.
Does SMBJ70CA-E3/5B require a heatsink for standard surge protection duty?
No, the SMBJ70CA-E3/5B does not require an external heatsink for transient suppression duty because its 600 W peak pulse power rating applies to non-repetitive events with ≤0.01 % duty cycle. Under normal operation, it dissipates only leakage current (≤1.0 µA at 70 V), resulting in negligible steady-state heating. Thermal management relies on PCB copper pads - specifically 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal - which provide sufficient conduction path for short-duration surges. The SMBJ70CA-E3/5B is designed for self-contained, board-level protection without auxiliary thermal hardware.
SMBJ70CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.3A
- 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)
SMBJ70CA-E3/5B FAQ
1.How can I place an order for SMBJ70CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CA-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 SMBJ70CA-E3/5B reliable?
The price and inventory of SMBJ70CA-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 SMBJ70CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ70CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CA-E3/5B?
SMBJ70CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CA-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 SMBJ70CA-E3/5B?
For technical support, including SMBJ70CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ70CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ70CA-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 SMBJ70CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ70CA-E3/5B?
All SMBJ70CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CA-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 SMBJ70CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ70CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CA-E3/5B Tags
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