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Taiwan Semiconductor Corporation SMBJ15
- Part No.:
- SMBJ15
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15.pdf
- Description:
- 600W, 18.6V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,515
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Product details
Overview
SMBJ15 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power rails and signal lines. It features a 15 V working stand-off voltage (VWM), 16.7–20.4 V breakdown voltage (VBR) at 1 mA test current, 23.1 A peak pulse current (IPP), and clamps transients to ≤26.9 V at 23.1 A with 10/1000 µs waveform.
For engineers reviewing the SMBJ15 datasheet, SMBJ15 pinout, SMBJ15 application, or SMBJ15 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current (<1 µA at 15 V), thermal derating above 25°C, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMBJ15 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR and low leakage, while the DO-214AA package provides 10°C/W junction-to-case thermal resistance for reliable power dissipation during 600 W transient events.
It delivers sub-1 ps response time and meets JESD201 Class 2 whisker resistance, enabling robust ESD and electrical fast transient (EFT) immunity in automotive and industrial control systems without requiring series impedance or additional filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected circuit's nominal rail. |
| VBR min/max | 16.7–20.4 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above 15 V while accommodating process variation. |
| VC @ IPP | ≤26.9 V @ 23.1 A - Clamped voltage during 10/1000 µs surge; must remain below downstream IC's absolute max rating (e.g., 30 V logic). |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs event; defines maximum transient energy absorption capability. |
| ID @ VWM | ≤1 µA - Reverse leakage at 15 V; negligible loading on 12–15 V supply rails or high-impedance signal paths. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments with proper PCB copper area. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point in protected circuit; establishes return path for surge current. |
| Cathode | Protected line input | Connected to line being safeguarded (e.g., 12 V battery feed); conducts avalanche current when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | Typically <1.0 ps - Enables suppression of nanosecond-scale ESD and EFT events before sensitive ICs experience overstress. |
| Glass passivated junction | Stable VBR tolerance and <1 µA leakage at VWM - Ensures consistent clamping behavior across temperature and lifetime. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) - Meets automotive OEM EMC requirements out-of-box. |
| DO-214AA mechanical robustness | UL 94V-0 molding compound + JESD201 Class 2 whisker resistance - Supports automated reflow assembly and long-term reliability in vibration-prone environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load-dump transients up to 40 V and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and upstream fuse or DC-DC converter input. Use Value: Clamps surges to ≤26.9 V within picoseconds, preventing damage to 36 V-rated power management ICs and meeting ISO 7637-2 Pulse 1/2a. |
Use Scenario: 4–20 mA current-loop sensors connected to PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS mounted at field-wire entry point to shunt induced lightning-induced surges before reaching op-amp front-end. Use Value: 23.1 A IPP capacity handles 1 kV/500 Ω surge generator tests; low 1 µA leakage avoids current-loop accuracy degradation. |
| LED Driver Overvoltage Clamp | USB Port ESD Suppression |
Use Scenario: Constant-current LED drivers powered from 15 V SMPS supplies in outdoor signage. IC Role / Device Role / Timing Role: TVS placed across driver input capacitor to clamp AC line transients coupled via transformer leakage. Use Value: 600 W PPK rating absorbs repetitive 10/1000 µs surges without degradation; 15 V VWM aligns with 13.5–16.5 V input range. |
Use Scenario: USB 2.0 data lines (D+/D−) in embedded host controllers subjected to ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional variant required for data lines; SMBJ15 is unidirectional and used only on VBUS line. Use Value: Sub-1 ps response prevents ESD pulse propagation to USB PHY; 26.9 V clamping protects 5 V tolerant VBUS switches and LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | Narrower VBR range (16.7–18.5 V vs. 16.7–20.4 V); lower clamping voltage (24.4 V vs. 26.9 V) at same IPP. | Better suited for tighter clamping margin requirements where protected IC has ≤25 V abs max rating. | Select SMBJ15A when clamping voltage headroom is critical; verify layout accommodates identical DO-214AA footprint. |
| SMBJ14 | Lower VWM (14 V), VBR (15.6–19.1 V), and clamping voltage (25.8 V); higher IPP (24.4 A). | Preferred for 12 V nominal systems where 14 V VWM provides larger margin over rail noise but still allows clean conduction during surge. | Choose SMBJ14 for 12 V automotive modules needing extra standoff margin; confirm system max transient doesn't exceed 25.8 V clamping. |
Compared with SMBJ15, SMBJ15A offers tighter VBR tolerance and lower VC for enhanced protection margin, while SMBJ14 provides greater standoff headroom at the cost of slightly reduced clamping performance-selection depends on whether design priority is surge energy handling (SMBJ15) or clamping precision (SMBJ15A) or noise margin (SMBJ14).
Availability
SMBJ15 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LED driver overvoltage clamping, and USB VBUS line protection requiring stable component supply and full traceability.
Supply support for SMBJ15 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 industrial, automotive, and consumer markets.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing ISO 7637-2 compliance, low leakage, and robust DO-214AA packaging for automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ15 under standard 10/1000 µs surge conditions?
The SMBJ15 clamps to a maximum of 26.9 V when subjected to its rated 23.1 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Taiwan Semiconductor's R2104 datasheet, ensuring predictable overvoltage limiting for downstream 30 V-rated components.
Is SMBJ15 suitable for bidirectional signal line protection such as RS-485 or CAN bus?
No, SMBJ15 is a unidirectional TVS diode intended for DC power rail or single-polarity signal protection. For bidirectional applications like RS-485 or CAN, a bipolar variant such as SMBJ15C or SMBJ15CA must be used-these have symmetrical breakdown in both directions and are explicitly designated with "C" or "CA" suffixes in the SMBJ series.
What is the leakage current specification for SMBJ15 at its working stand-off voltage?
The SMBJ15 exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 15 V working stand-off voltage (VWM), measured at 25°C. This ultra-low leakage ensures minimal impact on battery-powered circuits and high-impedance sensor interfaces, supporting long-term reliability in always-on systems.
Does SMBJ15 meet automotive-grade reliability standards beyond ISO 7637-2?
Yes, SMBJ15 meets JESD201 Class 2 whisker resistance, J-STD-020 moisture sensitivity level 1 (MSL-1), and UL 94V-0 flammability for its molding compound. While not AEC-Q200 qualified as a standalone component, its construction and test compliance support use in automotive subsystems where full qualification is managed at the module level.
What is the thermal resistance profile of SMBJ15, and how does it affect PCB layout?
SMBJ15 has a junction-to-case thermal resistance (RθJC) of 10°C/W and junction-to-ambient (RθJA) of 55°C/W. To maintain TJ ≤150°C during repeated surges, PCB layout must include ≥100 mm² of 1 oz copper connected to both terminals; insufficient copper area causes thermal runaway and premature failure under sustained transient stress.
SMBJ15 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ15 FAQ
1.How can I place an order for SMBJ15 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15 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 SMBJ15 reliable?
The price and inventory of SMBJ15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ15 is usually 5 days.
3.What payment methods are accepted for SMBJ15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15?
SMBJ15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15 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 SMBJ15?
For technical support, including SMBJ15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15 requirements.
6.How does Aetrix verify that SMBJ15 is sourced from the original manufacturer or authorized distributors?
All SMBJ15 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 SMBJ15 meets industry standards.
7.What is the process for return or replacement of SMBJ15?
All SMBJ15 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15, 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 SMBJ15 part is unused and in its original packaging.
Return procedure for SMBJ15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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