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Taiwan Semiconductor Corporation SMBJ15C
- Part No.:
- SMBJ15C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15C.pdf
- Description:
- 600W, 18.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,509
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Product details
Overview
SMBJ15C from Taiwan Semiconductor is a unidirectional 600W 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 15V working stand-off voltage (VWM), 16.7–20.4V breakdown voltage (VBR), 23.1A peak pulse current (IPP), and clamps transients to ≤26.9V at 23.1A with <1.0ps response time.
For engineers reviewing the SMBJ15C datasheet, SMBJ15C pinout, SMBJ15C application, or SMBJ15C equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, unidirectional polarity alignment with DC bias, thermal derating above 25°C ambient, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMBJ15C operates as a silicon avalanche diode that remains non-conductive below VWM (15V), then rapidly avalanches into low-impedance conduction when transient voltage exceeds VBR (min 16.7V). Its glass-passivated junction ensures stable leakage (<1μA at 15V) and long-term reliability under repeated surges.
Designed for 10/1000μs waveform immunity, it delivers 600W non-repetitive peak pulse power with junction-to-ambient thermal resistance of 55°C/W. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - enabling standard reflow without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets upper limit for protected circuit operating voltage. |
| VBR (min/max) | 16.7 / 20.4 V - Breakdown occurs within this range at 1 mA test current; defines minimum overvoltage threshold before clamping initiates. |
| VC @ IPP | 26.9 V - Clamped voltage at 23.1 A peak impulse current; must be below protected IC's absolute maximum rating. |
| IPP | 23.1 A - Peak surge current the device safely diverts for 10/1000μs waveform; determines protection level against ISO 7637-2 Pulse 1/2a. |
| PPK | 600 W - Non-repetitive peak pulse power handling; defines single-event energy absorption capability per IEC 61000-4-5. |
| IR @ VWM | <1 μA - Reverse leakage at 15 V; negligible power loss and no measurable loading on 15V supply rail. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive or industrial enclosures with limited airflow. |
Pinout & Package
DO-214AA (SMB) surface-mount package: cathode-banded end denotes the cathode terminal; anode is the unmarked end. Matte tin-plated leads ensure solderability per J-STD-002; case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 15V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or lowest potential reference; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression before sensitive ICs experience damaging voltage overshoot during ESD or lightning-induced transients. |
| Glass passivated junction | Stable VBR and low IR over 10+ year field life - critical for automotive modules requiring zero-failure reliability. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump), Pulse 3a/3b (switching noise) - meets OEM-level automotive EMC requirements. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before SMT assembly - reduces manufacturing overhead and avoids moisture-related popcorning. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green product certification and export compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump pulses up to 120V and inductive switching spikes from solenoids or relays. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and LDO/regulator input to clamp transients before they reach downstream power management ICs. Use Value: Limits voltage seen by regulator to ≤26.9V during 23.1A surge, preventing latch-up or permanent damage to 3.3V/5V logic supplies. |
Use Scenario: 4–20mA current loop transmitters interfacing with PLC analog inputs in factory automation environments. IC Role / Device Role / Timing Role: TVS mounted across loop terminals to absorb fast electrical fast transients (EFT) and electrostatic discharge events induced on long cable runs. Use Value: Maintains signal integrity by clamping transients to 26.9V while adding <1μA leakage - no impact on 4–20mA calibration accuracy. |
| LED Driver Input Protection | USB Port VBUS Line Protection |
Use Scenario: Constant-current LED drivers powered from 12–24V DC supplies in outdoor lighting systems subject to lightning-induced surges. IC Role / Device Role / Timing Role: SMBJ15C placed at driver input to shunt surge energy away from PWM controller and MOSFET gate drivers. Use Value: Withstands 600W peak pulse without degradation, ensuring multi-year operation in harsh outdoor environments per IEC 61000-4-5 Level 4. |
Use Scenario: USB Type-A host ports in industrial HMIs where hot-plug events and ESD can inject >8kV contact discharge onto VBUS. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBUS and GND to clamp ESD events before reaching USB power switch or controller. Use Value: Sub-1ps response captures ESD before USB PHY enters fault state; 26.9V clamping stays well below 5.5V VBUS tolerance of most USB switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA | Bidirectional variant: same VWM (15V), symmetric clamping in both polarities; slightly higher VC (27.6V) at same IPP (22.8A). | Required where AC-coupled signals or bidirectional data lines (e.g., RS-485, CAN) need protection without polarity constraints. | Select SMBJ15CA only if reverse-polarity transients are expected; SMBJ15C is optimal for DC rails with defined ground reference. |
| SMAJ15C | Lower power rating: 400W PPK, 15.0V VWM, 16.7–20.4V VBR, but lower IPP (15.4A) and higher VC (28.8V) at rated current. | Suitable for cost-sensitive consumer applications with lower surge threat levels (e.g., IEC 61000-4-2 Level 3), not ISO 7637-2 automotive. | Choose SMAJ15C only when 400W rating suffices and board space allows larger SMA footprint; SMBJ15C provides 50% higher surge margin in same SMB footprint. |
Compared with SMBJ15CA and SMAJ15C, the SMBJ15C delivers superior 600W surge handling and tighter clamping (26.9V) in the industry-standard SMB package - making it the preferred choice for automotive and industrial 12–15V DC rail protection where reliability under worst-case transients is mandatory.
Availability
SMBJ15C is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and LED driver production requiring stable component supply and full traceability through extended lifecycle phases.
Supply support for SMBJ15C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power management components since 1979.
The SMBJ series was engineered specifically for high-reliability transient suppression in automotive and industrial environments - emphasizing robustness against ISO 7637-2 pulses, low leakage, and MSL-1 manufacturability.
FAQ
What is the polarity configuration of SMBJ15C?
The SMBJ15C is a unidirectional TVS diode: the cathode is marked with a band on the DO-214AA (SMB) package body. It conducts only when the cathode is more positive than the anode by ≥VBR (16.7–20.4V), making it ideal for protecting positive DC rails referenced to ground. This polarity must be observed during PCB layout to ensure correct clamping behavior.
Does SMBJ15C meet automotive EMC standards?
Yes, SMBJ15C is explicitly validated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnection), Pulse 2b (alternator load dump), and Pulses 3a/3b (switching transients). Its 600W peak pulse power and 23.1A IPP rating enable compliance with OEM-level surge immunity requirements for 12V vehicle networks.
What is the maximum clamping voltage of SMBJ15C under surge conditions?
The SMBJ15C clamps to a maximum of 26.9V when subjected to its rated 23.1A peak impulse current (10/1000μs waveform). This value is guaranteed per datasheet Table "ELECTRICAL SPECIFICATIONS" and represents the worst-case voltage imposed on the protected circuit during a full-rated surge event.
Can SMBJ15C be used in bidirectional signal lines like RS-485?
No - SMBJ15C is unidirectional and will not suppress negative-going transients. For bidirectional lines, use the SMBJ15CA variant, which provides symmetrical clamping in both directions with identical VBR (16.7–20.4V) and VC (27.6V) specifications. Using SMBJ15C on AC-coupled or differential lines risks failure during reverse-polarity surges.
What is the thermal derating behavior of SMBJ15C above 25°C ambient?
SMBJ15C follows the standard derating curve shown in Figure 2 of the datasheet: peak pulse power decreases linearly from 600W at 25°C to zero at 150°C junction temperature. At 75°C ambient (assuming typical PCB copper area), usable PPK drops to ~420W - requiring design verification using RθJA = 55°C/W to ensure TJ remains ≤150°C during repeated surges.
SMBJ15C 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 23.1A
- 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)
SMBJ15C FAQ
1.How can I place an order for SMBJ15C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15C 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 SMBJ15C reliable?
The price and inventory of SMBJ15C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ15C is usually 5 days.
3.What payment methods are accepted for SMBJ15C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15C?
SMBJ15C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15C 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 SMBJ15C?
For technical support, including SMBJ15C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15C requirements.
6.How does Aetrix verify that SMBJ15C is sourced from the original manufacturer or authorized distributors?
All SMBJ15C 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 SMBJ15C meets industry standards.
7.What is the process for return or replacement of SMBJ15C?
All SMBJ15C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15C, 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 SMBJ15C part is unused and in its original packaging.
Return procedure for SMBJ15C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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