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Vishay General Semiconductor - Diodes Division SMBJ70CA-M3/52
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- Part No.:
- SMBJ70CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CA-M3/52.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,569
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Product details
Overview
SMBJ70CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 dissipation with a 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ70CA-M3/52 datasheet, SMBJ70CA-M3/52 pinout, SMBJ70CA-M3/52 application, or SMBJ70CA-M3/52 equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), MSL Level 1 rating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding VWM, it avalanches symmetrically in both directions to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMB package provides low incremental surge resistance and supports repetitive 0.01% duty-cycle surges.
The device is rated for continuous operation from −55 °C to +150 °C junction temperature, with thermal resistance from junction-to-ambient (100 °C/W) and junction-to-lead (20 °C/W) enabling reliable performance under sustained power dissipation up to 5.0 W at 50 °C ambient - critical for high-reliability industrial and telecom applications where thermal margin is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum reverse working voltage before clamping begins; defines safe operating range for DC-biased signal/power lines. |
| VBR min/max | 77.8 V / 86.0 V at IT = 1 mA - Confirmed bidirectional breakdown window; ensures consistent clamping onset across manufacturing lot and temperature. |
| VC @ IPPM | 113 V at 5.3 A (10/1000 µs) - Measured clamping voltage under standardized surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; enables suppression of high-energy transients like IEC 61000-4-5 Level 4 surges. |
| IPPM | 5.3 A - Peak pulse current supported at VC; directly correlates with surge energy absorption (E ≈ 0.4 × VC × IPPM × tp). |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design for continuous power derating. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in high-ambient environments such as enclosed industrial enclosures or base stations. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), MSL Level 1, matte tin-plated leads solderable per J-STD-002/JESD 22-B102. No polarity marking - bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical avalanche junction; accepts surge current regardless of polarity relative to cathode. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical junction; completes low-impedance shunt path during overvoltage events in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN, Ethernet PHY interfaces. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 surge immunity testing up to 4 kV line-to-ground in properly designed systems with series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - critical for protecting 75 V-rated MOSFETs or 100 V input-stage capacitors. |
| MSL Level 1, 260 °C reflow compatible | Eliminates moisture sensitivity handling requirements and supports standard lead-free reflow profiles without prebake. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance mandates for industrial and telecom equipment sold in EU, China, and North America. |
Applications
| Industrial Motor Drive Control | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback sensing circuits from inductive kickback during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed across DC bus or isolated signal lines to clamp voltage spikes before they reach control ICs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and isolated amplifiers by limiting transients to ≤113 V under 5.3 A surge conditions. |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs against lightning-induced surges on outdoor data lines in cellular base stations. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on differential pairs (A/B lines) to maintain common-mode integrity during fast-rising transients. Use Value: Maintains signal integrity by clamping common-mode surges symmetrically without introducing DC offset or skew between lines. |
| Automotive Body Control Module (BCM) | Consumer Appliance Power Supply Input |
|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V supply rails feeding microcontrollers and LIN transceivers in BCMs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, coordinated with upstream fuses and secondary TVS devices. Use Value: Withstands 12 V system transients up to 27 V for 400 ms (load dump) and clamps 10/1000 µs surges to ≤113 V - meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Protecting AC-DC adapter primary-side rectifier and controller ICs from mains-borne surges in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Secondary-level surge suppressor placed after MOVs and before bridge rectifier to handle residual fast transients. Use Value: Adds <1 ns response layer that complements slower MOVs, reducing let-through energy to <10 mJ - preventing premature failure of 600 V rectifiers. |
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-E3/52 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade designs where halogen-free certification is not mandated (e.g., non-export consumer goods). | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is unnecessary. |
| SMBJ70CAHM3_X | Identical electrical and mechanical specs; adds AEC-Q101 qualification and extended temperature validation (−55 °C to +150 °C). | Required for automotive applications subject to OEM component approval (e.g., body electronics, infotainment power rails). | Choose for automotive production programs needing documented reliability and qualification evidence beyond commercial grade. |
Compared with SMBJ70CA-M3/52, the E3 variant trades halogen-free compliance for lower unit cost in non-regulated markets, while the HM3_X variant adds automotive qualification at higher cost and longer lead time - making SMBJ70CA-M3/52 the optimal balance for industrial and telecom applications requiring halogen-free compliance without automotive certification.
Availability
SMBJ70CA-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, consumer appliance power supplies, and automotive body control modules requiring stable component supply, halogen-free compliance, and repeatable surge suppression performance.
Supply support for SMBJ70CA-M3/52 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in space-constrained SMT designs - targeting industrial automation, telecom infrastructure, and automotive subsystems where robustness and repeatability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ70CA-M3/52 under a 10/1000 µs surge?
The SMBJ70CA-M3/52 has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 5.3 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and reflects worst-case voltage let-through during surge events - critical for verifying margin against downstream component ratings. The SMBJ70CA-M3/52 maintains this clamping performance bidirectionally due to its symmetrical junction structure.
Is SMBJ70CA-M3/52 suitable for automotive applications?
The SMBJ70CA-M3/52 is qualified for commercial-grade use and meets RoHS and halogen-free requirements, but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification (e.g., body control modules, infotainment power rails), the automotive-grade variant SMBJ70CAHM3_X is recommended. The SMBJ70CA-M3/52 may be used in non-safety-critical aftermarket or development-stage automotive systems where qualification is not mandated - but full validation remains the customer's responsibility.
How does the bidirectional design of SMBJ70CA-M3/52 affect PCB layout?
The SMBJ70CA-M3/52 has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints during automated placement. Unlike unidirectional TVS diodes, it requires no attention to cathode band alignment - reducing assembly errors and enabling direct replacement in AC-coupled or floating differential paths (e.g., RS-485, CAN FD). Its SMB (DO-214AA) footprint remains identical regardless of application polarity.
What is the thermal resistance of SMBJ70CA-M3/52, and how does it impact power derating?
The SMBJ70CA-M3/52 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. This value governs continuous power derating: at 50 °C ambient, its 5.0 W power dissipation rating drops linearly above 25 °C per the derating curve in Figure 2 of the datasheet. Proper pad sizing and thermal vias are essential to maintain reliability under sustained surge repetition.
Does SMBJ70CA-M3/52 meet any industry surge immunity standards?
The SMBJ70CA-M3/52 is designed to support compliance with IEC 61000-4-5 (surge immunity) when implemented with appropriate series impedance and layout practices. Its 600 W peak pulse power rating corresponds to standardized 10/1000 µs waveforms used in Level 3–4 testing. While the device itself is not certified to a specific standard, its parameters enable system-level validation - for example, clamping a 4 kV line-to-ground surge to ≤113 V when paired with a 10 Ω source impedance. System-level testing remains mandatory.
SMBJ70CA-M3/52 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):
- 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-M3/52 FAQ
1.How can I place an order for SMBJ70CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CA-M3/52 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 SMBJ70CA-M3/52 reliable?
The price and inventory of SMBJ70CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ70CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CA-M3/52?
SMBJ70CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CA-M3/52 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 SMBJ70CA-M3/52?
For technical support, including SMBJ70CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ70CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ70CA-M3/52 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 SMBJ70CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ70CA-M3/52?
All SMBJ70CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CA-M3/52, 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 SMBJ70CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ70CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CA-M3/52 Tags
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