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Vishay General Semiconductor - Diodes Division SMBJ70CA-M3/5B
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- Part No.:
- SMBJ70CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CA-M3/5B.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,774
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Product details
Overview
SMBJ70CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70CA-M3/5B datasheet, SMBJ70CA-M3/5B pinout, SMBJ70CA-M3/5B application, or SMBJ70CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), halogen-free RoHS-compliant construction (M3 suffix), 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: under normal conditions it presents high impedance (>1 µA leakage at 70 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The device is rated for repetitive 600 W pulses (10/1000 µs, 0.01% duty cycle), derated above 25 °C per Fig. 2, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. It meets MSL level 1 (JEDEC J-STD-020) and supports peak forward surge current of 100 A (8.3 ms half-sine) only in unidirectional variants - not applicable to SMBJ70CA-M3/5B due to bidirectional polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - guaranteed breakdown range ensuring predictable turn-on during transients |
| VC @ IPPM | 113 V at 5.3 A - clamping voltage limits stress on protected ICs during worst-case 600 W surge |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform, enabling robust protection against lightning-induced surges |
| IPPM | 5.3 A - peak pulse current capacity derived from PPPM/VC, directly usable for PCB trace sizing and layout margining |
| TJ max. | +150 °C - maximum junction temperature allowing operation in high-ambient industrial environments without derating |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height, compatible with IPC-7351B |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient shunt path | Either terminal connects to protected line; bidirectional symmetry eliminates orientation constraints during placement |
| Case (cathode band absent) | Non-polarized junction | No cathode band marking confirms bidirectional operation - critical for AC-coupled or floating signal line protection |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating power rails without external polarity management |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-line) when paired with appropriate series impedance |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance for industrial and automotive-tier supply chains without compromising surge performance |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking - reduces manufacturing overhead in high-volume SMT lines |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection margin for 3.3 V/5 V logic |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protects 24 V DC input stage against load dump and inductive switching spikes from solenoids and relays. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed across input capacitor, clamping surges before they reach DC-DC controller ICs. Use Value: Limits voltage to ≤113 V during 5.3 A transients, preventing overvoltage failure of 36 V-rated input stages in buck controllers. |
Use Scenario: Shields LIN bus transceivers and microcontroller I/O pins from battery reverse connection and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional clamp on LIN signal line (VCC and LIN), absorbing ±100 V spikes within <1 ns. Use Value: Maintains signal integrity by clamping to 113 V while drawing <1 µA at 70 V standby, avoiding bus contention. |
| Telecom PoE Midspan Injector | Consumer Smart Home Sensor Hub |
|
Use Scenario: Safeguards 48 V DC power feed circuitry in IEEE 802.3af/at midspan injectors against Ethernet cable ESD and lightning coupling. IC Role / Device Role / Timing Role: Primary surge clamp on PSE output, coordinated with secondary TVS on PD side for cascaded protection. Use Value: Handles 600 W surges without degradation, enabling compliance with IEC 61000-4-5 Ed. 3 Class B (2 kV differential mode). |
Use Scenario: Guards Z-Wave/Zigbee RF module power and GPIO lines against ESD from user interface buttons and USB ports. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp on 3.3 V rail and antenna feed, minimizing RF distortion. Use Value: Clamps 8 kV contact ESD to <113 V in <1 ns, preserving RF sensitivity and preventing MCU latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-E3/5B | RoHS-compliant but contains brominated flame retardants; same electrical specs and SMB package | Acceptable for commercial-grade designs where halogen-free requirement is not mandated | Select when cost sensitivity outweighs halogen-free compliance; identical layout and thermal behavior |
| SMCJ70CA-M3 | Higher 1500 W PPPM, larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), same VWM/VC | Suitable for higher-energy surges (e.g., outdoor telecom) where board space allows larger footprint | Choose when surge energy exceeds 600 W margin; requires PCB redesign due to 40% larger pad area |
Compared with SMBJ70CA-E3/5B, the SMBJ70CA-M3/5B offers identical protection performance with halogen-free materials, while the SMCJ70CA-M3 provides 2.5× higher surge capacity at the cost of increased size and thermal mass - making SMBJ70CA-M3/5B optimal for space-constrained industrial and automotive modules requiring full environmental compliance.
Availability
SMBJ70CA-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom PoE injectors, and consumer smart home hubs requiring stable component supply with halogen-free compliance and MSL Level 1 handling.
Supply support for SMBJ70CA-M3/5B 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, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in compact SMT formats, targeting industrial automation, automotive electronics, and communications infrastructure where consistent clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ70CA-M3/5B at its rated peak pulse current?
The SMBJ70CA-M3/5B has a maximum clamping voltage (VC) of 113 V at 5.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ70CA-M3/5B maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ70CA-M3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ70CA-M3/5B is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free RoHS compliance for commercial-grade use. For automotive applications, Vishay offers the HM3 variant (e.g., SMBJ70CAHM3_B/I), which adds AEC-Q101 qualification while retaining identical electrical parameters and SMB packaging. The SMBJ70CA-M3/5B remains appropriate for non-automotive industrial and telecom systems.
How does the bidirectional design of SMBJ70CA-M3/5B affect PCB layout compared to unidirectional TVS diodes?
The SMBJ70CA-M3/5B has no cathode marking and symmetrical terminals, eliminating orientation constraints during pick-and-place - unlike unidirectional variants (e.g., SMBJ70A-M3/5B) that require correct anode/cathode alignment. This simplifies layout, reduces assembly errors, and enables direct replacement in AC-coupled circuits such as RS-485 or CAN bus stubs without signal polarity concerns. The SMBJ70CA-M3/5B achieves this without sacrificing clamping performance or surge rating.
What is the thermal resistance and power derating behavior of SMBJ70CA-M3/5B above 25 °C?
The SMBJ70CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 5.0 mm × 5.0 mm copper pads. Its 5.0 W steady-state power dissipation (PD) is linearly derated above 25 °C at 40 mW/°C, reaching zero at 150 °C. Peak pulse power (600 W) follows a separate derating curve per Figure 2 in the datasheet, maintaining full rating up to ~80 °C ambient before progressive reduction - critical for thermal design in enclosed industrial enclosures.
Can SMBJ70CA-M3/5B be used to protect 3.3 V or 5 V logic lines directly?
No, SMBJ70CA-M3/5B is not suitable for direct protection of 3.3 V or 5 V logic lines due to its 70 V stand-off voltage (VWM) and 77.8 V minimum breakdown voltage - far exceeding logic rail voltages. Using it would leave low-voltage ICs fully exposed to transients below 70 V. For 3.3 V/5 V rails, lower-voltage TVS devices such as SMBJ5.0CA-M3/5B (VWM = 5.0 V) or dedicated ESD arrays are required. The SMBJ70CA-M3/5B targets 24 V, 48 V, and higher-power system rails.
SMBJ70CA-M3/5B 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-M3/5B FAQ
1.How can I place an order for SMBJ70CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CA-M3/5B 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-M3/5B reliable?
The price and inventory of SMBJ70CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ70CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CA-M3/5B?
SMBJ70CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CA-M3/5B 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-M3/5B?
For technical support, including SMBJ70CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ70CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ70CA-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ70CA-M3/5B?
All SMBJ70CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CA-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ70CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CA-M3/5B Tags
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