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Taiwan Semiconductor Corporation SMBJ11C
- Part No.:
- SMBJ11C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ11C.pdf
- Description:
- 600W, 13.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,023
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Product details
Overview
SMBJ11C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 11 V working stand-off voltage (VWM), 12.2–14.9 V breakdown voltage (VBR @ 1 mA), 20.1 V maximum clamping voltage (VC @ 31 A), 600 W peak pulse power (10/1000 µs), and <1.0 ps response time - deployed in automotive lighting control modules and industrial sensor interfaces.
For engineers reviewing the SMBJ11C datasheet, SMBJ11C pinout, SMBJ11C application, or SMBJ11C equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, leakage current at operating voltage, thermal derating above 25°C ambient, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The SMBJ11C uses a glass-passivated silicon junction to achieve fast avalanche response and stable breakdown characteristics under repetitive surge stress. Its unidirectional configuration provides low forward voltage drop (VF = 3.5 V @ 50 A) while maintaining sub-1 µA blocking leakage at 11 V.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation up to TJ = +150 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR min/max | 12.2 V / 14.9 V @ 1 mA - Ensures consistent avalanche initiation across production lots and temperature range. |
| VC @ IPP | 20.1 V @ 31 A (10/1000 µs) - Clamping voltage must stay below protected IC's I/O or supply rail absolute max rating. |
| PPK | 600 W - Peak surge energy handling capability per single transient event per JEDEC standard waveform. |
| ID @ VWM | <1 µA - Minimal leakage ensures no measurable impact on low-power sensor bias networks or battery-backed circuits. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and enclosed industrial enclosures without forced cooling. |
Pinout & Package
DO-214AA (SMB) surface-mount package: cathode-banded end denotes the cathode terminal; anode is the opposite lead. Matte tin-plated leads comply with J-STD-002 solderability; case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; defines polarity for unidirectional clamping to VCC rail. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 12 V supply rail); conducts during overvoltage to shunt current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio (VC/VBR) | 1.61 typical (20.1 V / 12.5 V avg) - Tight ratio enables robust margin against IC damage while minimizing overshoot. |
| Response time | <1.0 ps - Fast enough to suppress ESD events before logic-level transients propagate into CMOS inputs. |
| ISO 7637-2 compliance | Pulse 1, 2a, 2b, 3a, 3b - Validated for automotive load-dump and inductive-switching immunity without external filtering. |
| Moisture sensitivity | Level 1 (J-STD-020) - No bake requirement prior to reflow; compatible with standard SMT assembly lines. |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontroller GPIOs from load-dump transients in 12 V vehicle lighting systems. IC Role / Device Role: Unidirectional TVS placed between VBAT rail and ground, clamping surges up to ±100 V. Use Value: Prevents latch-up or gate oxide rupture in 3.3 V/5 V logic ICs exposed to ISO 7637-2 Pulse 5a (load dump). |
Use Scenario: Safeguarding analog front-end (AFE) inputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role: Bidirectional clamping (via SMBJ11CA variant) across differential signal pairs subjected to EFT bursts. Use Value: Maintains signal integrity during IEC 61000-4-4 EFT testing (±2 kV, 5 kHz) without calibration drift or offset shift. |
| DC Power Rail Protection | USB Port ESD Protection |
Use Scenario: Shielding 5 V/12 V DC-DC converter outputs from inductive switching noise in motor drive subsystems. IC Role / Device Role: TVS connected from output rail to ground, absorbing flyback energy from relay coils or solenoid drivers. Use Value: Eliminates need for RC snubbers or ferrite beads in space-constrained designs while meeting CISPR 25 Class 4 radiated emissions. |
Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D− lines downstream of integrated port protectors. IC Role / Device Role: Low-capacitance unidirectional TVS (CJ ≈ 100 pF @ 0 V) placed inline with data lines. Use Value: Passes USB IF ESD test (±15 kV contact, ±8 kV air) without signal attenuation or eye diagram degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ11A | VBR = 12.2–13.5 V; VC = 18.2 V @ 34 A; same DO-214AC (SMA) footprint but smaller thermal mass (RθJA = 65 °C/W). | Lower clamping voltage improves margin for 3.3 V logic, but reduced PPK (400 W) limits use in high-energy load-dump scenarios. | Select when board space is constrained and surge energy is limited to IEC 61000-4-5 Level 3 (0.5 kV). |
| ON Semiconductor 1.5SMC11A | VBR = 12.2–13.5 V; VC = 18.2 V @ 34 A; DO-214AB (SMC) package - larger body, higher RθJA = 40 °C/W, 1500 W PPK rating. | Higher power handling supports repeated surges in industrial motor controls, but requires larger PCB pad area and reflow profile adjustment. | Choose for applications requiring >600 W single-pulse rating or multi-event endurance in harsh environments. |
Compared with SMBJ11C, SMAJ11A offers tighter clamping in a smaller footprint but lower surge capacity, while 1.5SMC11A delivers superior thermal robustness and energy absorption at the cost of board area - making SMBJ11C the balanced choice for space-constrained automotive and industrial DC rail protection.
Availability
SMBJ11C is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and DC power rail protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ11C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive ECUs and industrial control units where ISO 7637-2 compliance, low leakage, and robust thermal performance are mandatory.
FAQ
What is the polarity configuration of SMBJ11C?
SMBJ11C is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts only when the cathode is at a higher potential than the anode - ideal for protecting positive DC rails against overvoltage transients. The SMBJ11C does not conduct in reverse bias except during clamping, unlike bidirectional variants such as SMBJ11CA.
Does SMBJ11C meet automotive transient immunity standards?
Yes, SMBJ11C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms - covering common automotive transients including load dump, alternator ripple, and inductive switching spikes. This validation is documented in Taiwan Semiconductor's official SMBJ series datasheet (Version R2104), confirming its suitability for under-hood and body-control module applications.
What is the maximum clamping voltage of SMBJ11C at rated surge current?
The SMBJ11C has a maximum clamping voltage (VC) of 20.1 V when subjected to a 31 A peak impulse current with a 10/1000 µs waveform. This value is measured at TA = 25°C and guarantees that protected circuitry downstream will not experience voltages exceeding this threshold during standardized surge events - critical for safeguarding 24 V-tolerant or 3.3 V logic interfaces.
Can SMBJ11C be used in bidirectional signal line protection?
No - SMBJ11C is unidirectional and unsuitable for AC or bipolar signal lines without additional circuitry. For bidirectional protection, the SMBJ11CA variant (with "CA" suffix) must be used, as it is symmetrically rated for conduction in both directions. Using SMBJ11C on bidirectional lines risks permanent forward conduction and failure during negative transients.
What is the thermal resistance and maximum junction temperature of SMBJ11C?
SMBJ11C has a junction-to-case thermal resistance (RθJC) of 10 °C/W and a junction-to-ambient thermal resistance (RθJA) of 55 °C/W. Its maximum rated junction temperature is +150 °C, allowing operation in high-ambient environments such as engine compartments or sealed industrial enclosures - provided PCB copper area and airflow meet recommended layout guidelines in the SMBJ datasheet.
SMBJ11C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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 (SMB)
SMBJ11C FAQ
1.How can I place an order for SMBJ11C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ11C 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 SMBJ11C reliable?
The price and inventory of SMBJ11C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ11C is usually 5 days.
3.What payment methods are accepted for SMBJ11C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ11C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ11C?
SMBJ11C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ11C 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 SMBJ11C?
For technical support, including SMBJ11C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ11C requirements.
6.How does Aetrix verify that SMBJ11C is sourced from the original manufacturer or authorized distributors?
All SMBJ11C 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 SMBJ11C meets industry standards.
7.What is the process for return or replacement of SMBJ11C?
All SMBJ11C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ11C, 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 SMBJ11C part is unused and in its original packaging.
Return procedure for SMBJ11C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ11C Tags
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