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Vishay General Semiconductor - Diodes Division SMBJ70A-E3/5B
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- Part No.:
- SMBJ70A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70A-E3/5B.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
SMBJ70A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. 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, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ70A-E3/5B datasheet, SMBJ70A-E3/5B pinout, SMBJ70A-E3/5B application, or SMBJ70A-E3/5B equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in industrial control, automotive subsystems, and telecom infrastructure where fast response (<1 ps), low clamping ratio, and AEC-Q101 qualification readiness are critical.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 70 V), then rapidly avalanches below 1 ns when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Thermal design is constrained by RθJA = 100 °C/W and TJ(max) = 150 °C; derating applies above 25 °C ambient per Figure 2. The cathode band identifies polarity, and its matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 48 V or 60 V systems. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 113 V at 5.3 A (10/1000 µs) - Clamping voltage limits downstream IC stress; clamping ratio = 1.61 supports 100 V-rated components. |
| PPPM | 600 W - Peak surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) line-to-line transients. |
| IPPM | 5.3 A - Peak pulse current capability derived from 600 W / 113 V; validates protection level for defined waveform. |
| TJ(max) | 150 °C - Maximum junction temperature; enables operation in under-hood or enclosed industrial enclosures with limited airflow. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline (5.21 mm × 4.06 mm × 2.30 mm); compatible with automated pick-and-place and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode identified by a band-marked end. Terminals are matte tin-plated for reliable solder joint formation per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; completes current path during avalanche conduction. |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., 48 V supply rail or sensor output); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surge events without external series impedance. |
| Clamping voltage ≤113 V at 5.3 A | Provides 43 V overhead margin above 70 V VWM, ensuring downstream 100 V-rated MOSFETs or regulators remain within safe operating area. |
| Response time <1 ns | Prevents sub-microsecond ESD or fast-rising transients from propagating past the device into IC inputs. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance mandates without halogen restrictions; suitable for non-automotive volume production. |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) Input Protection |
|---|---|
|
Use Scenario: Protects 48 V DC bus input of motor drive controllers from load dump and inductive kickback during relay switching. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly across input terminals, clamping surges before they reach DC-DC converters and gate drivers. Use Value: Withstands 600 W pulses and clamps to 113 V, preventing damage to 100 V-rated input capacitors and enabling compliance with ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguards LIN bus interface and microcontroller I/O pins in BCM against ESD and battery line transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground, activated only during positive-going overvoltage events. Use Value: Sub-1 ns response and 113 V clamping preserve signal integrity on 12 V nominal lines while meeting ISO 10605 ESD immunity requirements. |
| Telecom Remote Radio Unit (RRU) Power Input | Consumer Smart Home Hub DC Input Stage |
|
Use Scenario: Shields 48 V PoE-derived power input of outdoor RRU equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary front-end surge clamp mounted at connector entry point, coordinated with upstream GDT or MOV for staged protection. Use Value: 600 W rating and 113 V clamping allow integration into compact RRU PCBs without heatsinking, supporting EN 61000-4-5 Level 4 compliance. |
Use Scenario: Guards 5 V/12 V USB-C or barrel jack input of smart home hubs against user-induced ESD and AC adapter transients. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 70 V) unidirectional TVS placed immediately after input fuse and before primary DC-DC regulator. Use Value: 70 V VWM provides ample margin over 12 V max input, while 113 V clamping protects 16 V-rated input capacitors and LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-E3/5B | Bidirectional variant; symmetrical VBR (77.8–86.0 V) in both polarities; no polarity marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN FD); unsuitable for DC rail protection without additional polarity control. | Select SMBJ70CA-E3/5B only when protecting bidirectional signals or floating lines where reverse voltage may occur. |
| SMAJ70A-E3/52 | Lower power rating (400 W vs. 600 W); same VWM/VBR but higher VC (138 V at 2.9 A); SMA (DO-214AC) package (smaller footprint, lower thermal mass). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not recommended for IEC 61000-4-5 line surges or inductive switching. | Choose SMAJ70A-E3/52 only for space-constrained consumer designs with verified low-surge-risk environments. |
Compared with SMBJ70CA-E3/5B and SMAJ70A-E3/52, the SMBJ70A-E3/5B delivers superior 600 W surge handling and optimized clamping for unidirectional DC rails-making it the preferred choice for industrial and automotive power input protection where peak energy and thermal robustness are decisive.
Availability
SMBJ70A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom remote radio units requiring stable component supply, RoHS-compliant sourcing, and tape-and-reel delivery for SMT production.
Supply support for SMBJ70A-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, power efficiency, and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and MSL Level 1 reflow compatibility are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ70A-E3/5B under a 10/1000 µs surge?
The SMBJ70A-E3/5B has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 5.3 A with a 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88392, and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ70A-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBJ70A-E3/5B suitable for automotive applications?
The SMBJ70A-E3/5B is RoHS-compliant and rated for operation from –55 °C to +150 °C, but it is not AEC-Q101 qualified in the E3 suffix configuration. For automotive use, Vishay specifies the HE3 suffix (e.g., SMBJ70AHE3_B/I) which carries full AEC-Q101 qualification. The SMBJ70A-E3/5B remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, such as infotainment power rails or accessory modules.
How does the SMBJ70A-E3/5B differ from the SMBJ70CA-E3/5B?
The SMBJ70A-E3/5B is unidirectional, with a cathode band indicating polarity and designed for DC line protection; the SMBJ70CA-E3/5B is bidirectional, symmetric in both directions, and used for AC or floating signal lines like RS-485. Both share identical VWM (70 V), VBR, and PPPM (600 W), but the SMBJ70A-E3/5B cannot suppress negative transients without external circuitry, whereas the SMBJ70CA-E3/5B handles ±70 V stand-off inherently.
What is the thermal resistance of SMBJ70A-E3/5B, and how does it affect layout?
The SMBJ70A-E3/5B 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. To maintain TJ ≤ 150 °C under sustained 5.0 W dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Derating is required above 25 °C ambient per Figure 2 in the datasheet, and the SMBJ70A-E3/5B relies on pad thermal mass-not heatsinks-for transient thermal management.
Does SMBJ70A-E3/5B meet UL 497B recognition?
Yes, the SMBJ70A-E3/5B is Underwriters Laboratories (UL) recognized under file number E136766 for protector classification per UL 497B, covering both unidirectional and bidirectional variants in the SMBJ family. This recognition confirms compliance for use in telecommunications and data line protection applications where UL listing is required, and applies specifically to the SMBJ70A-E3/5B as part of the qualified SMBJ5.0A–SMBJ188A series.
SMBJ70A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ70A-E3/5B FAQ
1.How can I place an order for SMBJ70A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70A-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 SMBJ70A-E3/5B reliable?
The price and inventory of SMBJ70A-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 SMBJ70A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ70A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70A-E3/5B?
SMBJ70A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70A-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 SMBJ70A-E3/5B?
For technical support, including SMBJ70A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70A-E3/5B requirements.
6.How does Aetrix verify that SMBJ70A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ70A-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 SMBJ70A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ70A-E3/5B?
All SMBJ70A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70A-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 SMBJ70A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ70A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70A-E3/5B Tags
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