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Vishay General Semiconductor - Diodes Division SMBJ70CA-E3/52
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- Part No.:
- SMBJ70CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CA-E3/52.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
SMBJ70CA-E3/52 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 signal or power 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 capability with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70CA-E3/52 datasheet, SMBJ70CA-E3/52 pinout, SMBJ70CA-E3/52 application, or SMBJ70CA-E3/52 equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling robust surge suppression without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for repeatable transient response under repetitive 0.01% duty cycle surges.
The SMBJ70CA-E3/52 delivers 113 V clamping at 5.3 A (10/1000 µs), with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting operation from –55 °C to +150 °C. It meets UL 497B recognition (QVGQ2) and J-STD-020 MSL Level 1, allowing reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC signal line operating margin. |
| VBR min/max | 77.8 V / 86.0 V at IT = 1 mA - Confirmed bidirectional breakdown window; ensures reliable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 113 V at 5.3 A (10/1000 µs) - Clamping voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| PPPM | 600 W - Peak transient energy absorption capacity; validated per ANSI/IEEE C62.35 with 0.01% duty cycle derating. |
| ID @ VWM | 1.0 µA - Reverse leakage at rated stand-off; negligible loading on high-impedance sensor or communication lines. |
| TJ max | +150 °C - Maximum junction temperature; enables use in enclosed industrial enclosures or near heat-generating components. |
| RθJA | 100 °C/W - Thermal resistance defining self-heating under sustained 5.0 W dissipation; requires minimum 5.0 mm × 5.0 mm copper pad per terminal. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | One end of the symmetrical avalanche junction; connects to line under protection (e.g., RS-485 A or CAN_H). |
| Terminal 2 | Cathode (bidirectional) | Other end of the symmetrical junction; connects to reference (e.g., GND or complementary line like RS-485 B). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential or AC-coupled lines (e.g., Ethernet PHY, RS-485) without polarity concerns. |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V–48 V bus systems when properly laid out with 5 mm² copper pads. |
| MSL Level 1 rating | Allows standard SMT reflow profile (peak 260 °C) without baking; eliminates pre-conditioning overhead in high-volume manufacturing. |
| Glass-passivated junction | Ensures long-term VBR stability and low leakage drift over 10+ years in industrial environments (–40 °C to +85 °C ambient). |
| UL 497B recognized | Validated for telecom and industrial signal line protection per Underwriters Laboratories safety standard QVGQ2 (E136766). |
Applications
| Industrial Motor Drive I/O Protection | Automotive Body Control Module (BCM) Sensor Lines |
|---|---|
|
Use Scenario: Protecting encoder feedback lines and digital input pins from inductive kickback during contactor switching in PLC-controlled motor drives. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient spikes before they reach microcontroller GPIO or isolated digital inputs. Use Value: Prevents latch-up or permanent damage to STM32H7 or TMS570LS04x inputs during 100 V/10 A transients induced by 24 V solenoid de-energization. |
Use Scenario: Shielding LIN bus and analog temperature/humidity sensor lines in BCM against load dump and jump-start surges. IC Role / Device Role / Timing Role: Fast-response voltage clamp on 12 V supply-routed sensor traces, placed within 2 cm of connector entry point. Use Value: Limits voltage excursion to ≤113 V during ISO 7637-2 Pulse 5a (75 V/100 ms), preserving signal integrity for NXP MC33FS4500 ADC inputs. |
| Telecom Power-over-Ethernet (PoE) Data Line Guarding | Consumer Smart Home Hub USB-C Port ESD/Surge Combo Protection |
|
Use Scenario: Safeguarding RJ45 data pairs (pins 1–2, 3–6) in IEEE 802.3af/at PoE injectors and splitters from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (two SMBJ70CA-E3/52) bridging each differential pair to chassis ground. Use Value: Clamps 1 kV/1.2 µs × 50 µs surges to <120 V while maintaining <0.5 pF junction capacitance per line - no degradation of 100BASE-TX signal integrity. |
Use Scenario: Dual-role protection on USB-C CC and VBUS lines in smart home hubs exposed to user-handling ESD and accidental 24 V adapter misconnection. IC Role / Device Role / Timing Role: Bidirectional clamping element placed upstream of USB-C controller (e.g., Cypress CCG3PA) and buck converter. Use Value: Absorbs ±15 kV HBM ESD (IEC 61000-4-2) and clamps 24 V misinsertion to 113 V, preventing damage to internal USB PD policy engine and PMIC. |
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-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same MSL Level 1 and thermal performance. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy (e.g., EU automotive Tier 1). | Choose SMBJ70CA-M3/52 when halogen-free materials are contractually required; otherwise SMBJ70CA-E3/52 offers broader commercial availability. |
| SMAJ70CA-E3/61 | Lower peak pulse power (400 W vs. 600 W), smaller SMA (DO-214AC) package (3.5 mm × 4.5 mm), higher RθJA (140 °C/W), same VWM/VBR/VC ratings. | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD only); not recommended for IEC 61000-4-5 surge due to reduced power handling and thermal margin. | Select SMAJ70CA-E3/61 only for space-constrained designs with verified sub-400 W surge requirements; SMBJ70CA-E3/52 remains preferred for industrial-grade surge immunity. |
Compared with SMBJ70CA-M3/52, the SMBJ70CA-E3/52 offers identical protection performance with standard RoHS compliance, while SMAJ70CA-E3/61 trades 33% peak power and higher thermal resistance for 30% smaller footprint - making SMBJ70CA-E3/52 the optimal balance of robustness, manufacturability, and regulatory flexibility.
Availability
SMBJ70CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, PoE infrastructure, and consumer smart device designs requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMBJ70CA-E3/52 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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where consistent clamping behavior and AEC-Q101 qualification options are essential.
FAQ
What is the clamping voltage of SMBJ70CA-E3/52 at its rated peak pulse current?
The SMBJ70CA-E3/52 has a maximum clamping voltage (VC) of 113 V at 5.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring downstream ICs like microcontrollers or transceivers remain within absolute maximum ratings.
Is SMBJ70CA-E3/52 suitable for protecting RS-485 differential bus lines?
Yes, SMBJ70CA-E3/52 is widely deployed for RS-485 bus protection due to its bidirectional symmetry, low clamping ratio (~1.45), and 1.0 µA leakage at 70 V. When placed across A–B lines or from each line to ground (in combination), it suppresses common-mode surges up to 600 W without distorting signal edges - validated in Vishay application note AN8001 for industrial fieldbus systems using MAX1487 or SN65HVD72 transceivers.
Does SMBJ70CA-E3/52 require special PCB layout considerations?
Yes - to achieve rated 600 W pulse power, SMBJ70CA-E3/52 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the datasheet. Narrow traces or insufficient copper area increase thermal impedance, causing premature failure during repetitive surges. A compact layout with short, wide traces between the device and protected node is mandatory for effective transient energy diversion.
What is the meaning of the "CA" suffix in SMBJ70CA-E3/52?
The "CA" suffix in SMBJ70CA-E3/52 explicitly denotes a bidirectional configuration - meaning the device provides symmetrical avalanche breakdown in both forward and reverse directions. This distinguishes it from unidirectional variants (e.g., SMBJ70A), which have a cathode band and conduct only in reverse bias. Bidirectionality makes SMBJ70CA-E3/52 ideal for AC signal lines, differential buses, and applications where polarity cannot be guaranteed.
Can SMBJ70CA-E3/52 be used in automotive applications?
SMBJ70CA-E3/52 itself is commercial-grade (RoHS-compliant, MSL Level 1), but Vishay offers AEC-Q101 qualified versions under ordering codes SMBJ70CAHE3_X (e.g., SMBJ70CAHE3_B). For non-safety-critical automotive modules like infotainment or body control sensors, SMBJ70CA-E3/52 may be used subject to system-level validation; however, certified designs require the HE3-suffixed AEC-Q101 variant to meet automotive reliability and qualification requirements.
SMBJ70CA-E3/52 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-E3/52 FAQ
1.How can I place an order for SMBJ70CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CA-E3/52 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-E3/52 reliable?
The price and inventory of SMBJ70CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ70CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CA-E3/52?
SMBJ70CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CA-E3/52 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-E3/52?
For technical support, including SMBJ70CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ70CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ70CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ70CA-E3/52?
All SMBJ70CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ70CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CA-E3/52 Tags
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