My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ18CA-E3/52
;;2.jpg)
- Part No.:
- SMBJ18CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CA-E3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:497
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ18CA-E3/52 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 signal and power lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤29.2 V at 20.5 A peak surge current - protecting sensitive ICs, MOSFETs, and sensor interfaces in industrial and telecom systems.
For engineers reviewing the SMBJ18CA-E3/52 datasheet, SMBJ18CA-E3/52 pinout, SMBJ18CA-E3/52 application, or SMBJ18CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.42), JEDEC-standard SMB footprint compatibility, and AEC-Q101 qualification availability in related variants - all critical for robust ESD and lightning surge protection design.
Technical Context
This TVS diode operates as a voltage-clamping device across two terminals with symmetrical reverse/forward conduction behavior due to its bidirectional construction. Its silicon avalanche junction delivers sub-nanosecond response time and low dynamic impedance under transient stress, enabling effective suppression of inductive switching spikes and EFT bursts.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity requirements when applied with appropriate PCB layout. Thermal resistance (RθJA = 100 °C/W) and maximum junction temperature (TJ = 150 °C) define its derating envelope for repetitive surge events in ambient temperatures up to +85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - guaranteed avalanche initiation range; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | ≤29.2 V at IPPM = 20.5 A (10/1000 µs) - defines worst-case voltage seen by protected circuit during surge. |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity for standardized 10/1000 µs waveform; determines survivability against lightning surges. |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - minimal standby current; avoids loading low-power sensor or communication lines. |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline; compatible with automated placement and reflow profiles up to 260 °C. |
| Operating Temperature | −55 °C to +150 °C - supports deployment in automotive engine bays, industrial controls, and outdoor telecom enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, MSL Level 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminal | No functional polarity - either terminal serves as input/output for transient suppression on AC or differential lines. |
| Cathode Band (absent) | Non-applicable | Bidirectional devices omit cathode band marking per Vishay specification; terminals are electrically interchangeable. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without external series impedance. |
| Low clamping voltage (VC/VBR ≈ 1.42) | Minimizes stress on downstream components - e.g., keeps 3.3 V or 5 V logic inputs within safe absolute maximum ratings. |
| Sub-nanosecond response time | Activates before most microsecond-scale transients fully develop, preventing latch-up or gate oxide damage in MOSFETs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; reduces manufacturing overhead in high-volume assembly. |
| AEC-Q101 qualification option | HE3/HM3 variants support automotive applications requiring validated reliability for powertrain and ADAS subsystems. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Suppresses inductive kickback from 24 V solenoid coils and relay drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across coil terminals or between signal line and ground. Use Value: Limits flyback voltage to ≤29.2 V, preventing damage to isolated gate drivers and microcontroller GPIOs rated for 36 V max. |
Use Scenario: Protects LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control units. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) shunt suppressor on bidirectional data lines and supply rails. Use Value: Maintains signal integrity during load dump (ISO 7637-2) and ESD events while adding <0.5 ns propagation delay. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Shields 48 V PoE midspan injectors and PSE controllers from Ethernet cable surge coupling. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC/DC converters and hot-swap controllers. Use Value: Absorbs 600 W surges without thermal runaway, preserving converter enable timing and avoiding brownout resets. |
Use Scenario: Safeguards USB-C CC and VBUS lines against ESD and accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Secondary-stage protector after common-mode chokes, co-located with ESD arrays. Use Value: Clamps VBUS to ≤29.2 V during 100 A surge, preventing overvoltage lockout in USB PD controllers like FUSB302. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Unidirectional variant; same VWM/VBR/VC specs but asymmetric conduction - requires correct polarity orientation. | Suitable only where DC bias is fixed and reverse conduction must be blocked (e.g., 12 V supply rail). | Select SMBJ18A-E3/52 only if system topology mandates unidirectional blocking; otherwise SMBJ18CA-E3/52 offers greater layout flexibility. |
| SMAJ18CA-E3/52 | Lower PPPM (400 W vs. 600 W); identical VWM/VBR but higher VC (32.4 V at 13.7 A) due to smaller SMA package. | Acceptable for lower-energy threats (IEC 61000-4-2 ±8 kV contact) but marginal for IEC 61000-4-5 surge compliance. | Choose SMAJ18CA-E3/52 only when board space is constrained and surge threat level is limited to ESD/EFT - not full lightning surge. |
Compared with SMBJ18A-E3/52 and SMAJ18CA-E3/52, SMBJ18CA-E3/52 uniquely balances 600 W surge handling, bidirectional symmetry, and SMB footprint - making it optimal for AC-coupled, differential, or polarity-agnostic protection where both energy rating and layout simplicity are required.
Availability
SMBJ18CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power feeds, and consumer USB-C port protection requiring stable component supply and consistent surge performance across production batches.
Supply support for SMBJ18CA-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, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in compact SMD formats, targeting industrial automation, automotive electronics, and communications infrastructure where robustness and JEDEC-compliant manufacturability are essential.
FAQ
What is the clamping voltage of SMBJ18CA-E3/52 at its rated peak pulse current?
The SMBJ18CA-E3/52 clamps to a maximum of 29.2 V when subjected to its specified peak pulse current of 20.5 A under the 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and reflects worst-case voltage exposure for downstream circuitry during surge events - a critical parameter for ensuring protected ICs remain within their absolute maximum ratings.
Is SMBJ18CA-E3/52 RoHS-compliant and lead-free?
Yes, SMBJ18CA-E3/52 carries the "E3" suffix, indicating full RoHS compliance and lead-free construction per EU Directive 2011/65/EU. The matte tin-plated leads meet J-STD-002 solderability standards and JESD 22-B102 whisker testing Class 2, ensuring long-term reliability in lead-free reflow processes up to 260 °C peak temperature.
Does SMBJ18CA-E3/52 have polarity markings on the package?
No, SMBJ18CA-E3/52 does not feature a cathode band or other polarity marking because it is a bidirectional TVS diode. Its symmetrical construction allows installation in either orientation on PCBs - simplifying layout and eliminating risk of reverse placement during automated assembly. This contrasts with unidirectional variants like SMBJ18A-E3/52, which require correct cathode alignment.
What is the maximum junction temperature rating for SMBJ18CA-E3/52?
The SMBJ18CA-E3/52 has a maximum junction temperature (TJ) rating of +150 °C, supporting operation in high-ambient environments such as industrial control cabinets or under-hood automotive locations. Derating begins above 25 °C ambient per Figure 2 in the datasheet, with thermal resistance RθJA = 100 °C/W on standard 0.2" × 0.2" copper pads - enabling accurate thermal design for repetitive surge duty cycles.
How does SMBJ18CA-E3/52 differ from the SMAJ18CA-E3/52 in practical circuit protection?
SMBJ18CA-E3/52 delivers 600 W peak pulse power versus 400 W for SMAJ18CA-E3/52, resulting in a lower clamping voltage (29.2 V vs. 32.4 V) at higher surge current (20.5 A vs. 13.7 A). In practice, this means SMBJ18CA-E3/52 maintains tighter voltage control during IEC 61000-4-5 Level 3 surges, reducing stress on downstream regulators and interface ICs - especially critical in 24 V and 48 V industrial power rails.
SMBJ18CA-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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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)
SMBJ18CA-E3/52 FAQ
1.How can I place an order for SMBJ18CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CA-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 SMBJ18CA-E3/52 reliable?
The price and inventory of SMBJ18CA-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 SMBJ18CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CA-E3/52?
SMBJ18CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CA-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 SMBJ18CA-E3/52?
For technical support, including SMBJ18CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ18CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18CA-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 SMBJ18CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18CA-E3/52?
All SMBJ18CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CA-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 SMBJ18CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ18CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CA-E3/52 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
