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Vishay General Semiconductor - Diodes Division SMBJ18CAHE3/5B
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- Part No.:
- SMBJ18CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,303
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Product details
Overview
SMBJ18CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust ESD and surge protection on signal/power lines. It features 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), clamping voltage of 29.2 V at 20.5 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMBJ18CAHE3/5B datasheet, SMBJ18CAHE3/5B pinout, SMBJ18CAHE3/5B application, or SMBJ18CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly in automotive sensor interfaces and industrial I/O protection circuits.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients exceeding its reverse stand-off voltage (VWM = 18 V). Its bidirectional symmetry enables identical clamping behavior in both polarities-critical for AC-coupled or floating signal lines like CAN bus stubs or RS-485 differential pairs.
The device uses a glass-passivated silicon junction with low incremental surge resistance (typical <0.3 Ω), enabling stable clamping under repetitive 10/1000 µs surges at 0.01% duty cycle. Thermal resistance (RθJA = 100 °C/W) and junction temperature limit (TJ max = 150 °C) support operation in compact, unheatsinked PCB layouts typical of automotive ECUs and industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins; defines safe signal swing margin for protected line. |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 600 W transient; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W (10/1000 µs) - Peak surge energy handling capacity; meets IEC 61000-4-5 Level 4 (4 kV) when properly laid out. |
| 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; supports under-hood automotive placement without derating at 85 °C ambient. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
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 compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (negative half-cycle) | Conducts surge current when voltage at this terminal falls >0.7 V below cathode; forms symmetrical clamp path. |
| Cathode | Transient current sink (positive half-cycle) | Conducts surge current when voltage at this terminal rises >0.7 V above anode; completes bidirectional clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions-enables single-device protection of AC, differential, or floating lines without polarity concerns. |
| 600 W peak pulse rating | Withstands 10/1000 µs surges up to 20.5 A-meets IEC 61000-4-5 surge immunity requirements for industrial and automotive ports. |
| AEC-Q101 qualification | Validated for automotive under-hood environments including thermal cycling (-40 °C to +125 °C), HTRB, and ESD (HBM ≥ 8 kV). |
| Low clamping ratio | VC/VBR ≈ 1.45-minimizes overvoltage stress on protected ICs compared to alternatives with ratios >1.6. |
| MSL Level 1 | No floor life limitation; compatible with standard reflow profiles up to 260 °C peak-eliminates baking requirements pre-assembly. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Port |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature (ECT) and manifold absolute pressure (MAP) sensors from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and ground, clamping spikes before they reach ADC input or microcontroller GPIO. Use Value: Prevents sensor signal corruption and MCU reset events during 12 V system load dump (ISO 7637-2 Pulse 5a), leveraging 29.2 V clamping to stay below 3.3 V/5 V rail tolerance limits. |
Use Scenario: Safeguarding RS-485 transceiver terminals (A/B) against ESD (IEC 61000-4-2 ±15 kV contact) and surge (IEC 61000-4-5 ±2 kV) in factory automation PLC backplanes. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential pair, symmetrically limiting common-mode and differential-mode overvoltages. Use Value: Maintains data integrity during field maintenance events by clamping transients within 1 ns, avoiding transceiver latch-up or permanent damage while preserving signal rise/fall times. |
| Consumer USB-C Power Delivery | Telecom DSL Line Interface |
Use Scenario: Secondary-level surge suppression on VBUS and CC lines of USB-C receptacles in portable docking stations exposed to accidental 24 V adapter misconnection. IC Role / Device Role / Timing Role: Standoff-limited TVS placed after primary fuse and upstream of USB PD controller, absorbing residual energy not diverted by front-end protection. Use Value: Limits VBUS overshoot to ≤29.2 V during fault conditions-well below USB PD 3.0 20 V max, preventing controller latch-up and enabling auto-recovery without host intervention. |
Use Scenario: Protecting ADSL/VDSL line driver/receiver ICs from lightning-induced surges entering via outdoor copper pairs in residential gateways. IC Role / Device Role / Timing Role: Primary shunt protector on line side of transformer, clamping common-mode transients before coupling into low-voltage PHY circuitry. Use Value: Withstands 600 W surges per ITU-T K.20/K.21-reducing field failure rate in humid coastal deployments where induced voltages exceed 1 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated by OEM spec (e.g., EU automotive Tier 1). | Choose SMBJ18CA-M3/5B when halogen-free bill-of-materials is required; otherwise SMBJ18CAHE3/5B offers same performance with broader supply chain availability. |
| SMCJ18CAHE3/5B | Same VWM/VBR/VC but in larger SMC (DO-214AB) package; 1500 W PPPM rating and lower RθJA (50 °C/W). | Higher power handling and better thermal performance-but requires 30% more PCB area and may not fit space-constrained modules. | Choose SMCJ18CAHE3/5B only when surge threat exceeds 600 W or board layout allows larger footprint; SMBJ18CAHE3/5B remains optimal for cost- and space-sensitive automotive body control units. |
Compared with SMBJ18CA-M3/5B, SMBJ18CAHE3/5B provides identical protection performance with standard RoHS compliance, while SMCJ18CAHE3/5B trades PCB area for higher surge margin-making SMBJ18CAHE3/5B the balanced choice for AEC-Q101-compliant, space-constrained automotive and industrial designs requiring proven 600 W immunity.
Availability
SMBJ18CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 interface hardening, and consumer USB-C power delivery systems requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMBJ18CAHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-speed, high-energy transient suppression in automotive, industrial, and telecom infrastructure where consistent clamping and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ18CAHE3/5B and how is it measured?
The SMBJ18CAHE3/5B has a maximum clamping voltage (VC) of 29.2 V, measured at a peak pulse current (IPPM) of 20.5 A using a standardized 10/1000 µs double-exponential waveform. This value reflects the actual voltage seen by downstream circuitry during worst-case surge events and is guaranteed across temperature and production lots per Vishay Document 88392.
Is SMBJ18CAHE3/5B suitable for automotive applications?
Yes, SMBJ18CAHE3/5B is AEC-Q101 qualified and explicitly rated for automotive use-including under-hood environments. Its 150 °C maximum junction temperature, MSL Level 1 rating, and validation across thermal cycling, HTRB, and ESD tests make it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability is critical.
How does the bidirectional design of SMBJ18CAHE3/5B affect its circuit placement?
The bidirectional design of SMBJ18CAHE3/5B eliminates polarity constraints-no cathode band marking is present, and the device functions identically regardless of orientation. This simplifies layout on differential lines (e.g., CAN, RS-485), AC-coupled signals, or floating grounds, reducing BOM complexity and eliminating risk of reverse installation during SMT assembly.
What is the thermal resistance of SMBJ18CAHE3/5B and how does it impact PCB layout?
SMBJ18CAHE3/5B 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, designers must ensure adequate copper area and avoid enclosing the device in thermally restrictive enclosures or conformal coatings without derating.
Can SMBJ18CAHE3/5B replace unidirectional TVS diodes in existing designs?
SMBJ18CAHE3/5B can replace unidirectional variants only if the circuit topology supports bidirectional clamping-such as across differential pairs or AC signal paths. In DC-biased lines (e.g., 5 V supply rail), a unidirectional device is required; substituting SMBJ18CAHE3/5B would allow forward conduction during normal operation, causing malfunction. Always verify bias conditions before substitution.
SMBJ18CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ18CAHE3/5B FAQ
1.How can I place an order for SMBJ18CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHE3/5B 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 SMBJ18CAHE3/5B reliable?
The price and inventory of SMBJ18CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHE3/5B?
SMBJ18CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHE3/5B 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 SMBJ18CAHE3/5B?
For technical support, including SMBJ18CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ18CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHE3/5B 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 SMBJ18CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHE3/5B?
All SMBJ18CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHE3/5B, 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 SMBJ18CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ18CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHE3/5B Tags
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