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Taiwan Semiconductor Corporation SMBJ17A
- Part No.:
- SMBJ17A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17A.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:25,673
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Product details
Overview
SMBJ17A 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 17 V working stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), 22.8 A peak pulse current (IPP), 27.6 V clamping voltage (VC) at IPP, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ17A datasheet, SMBJ17A pinout, SMBJ17A application, or SMBJ17A equivalent, key selection criteria include clamping performance under 10/1000 µs transients, leakage current ≤1 µA at 17 V, unidirectional polarity marking, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and suitability for automotive load-dump and inductive-switching protection.
Technical Context
The SMBJ17A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (18.9–20.9 V @ 1 mA), then clamping transient energy to ≤27.6 V at 22.8 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA @ VWM = 17 V).
Thermal design relies on RθJA = 55 °C/W and RθJC = 10 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance, enabling robust automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 18.9 / 20.9 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on above system nominal voltage. |
| VC @ IPP | 27.6 V @ 22.8 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient stress. |
| PPK | 600 W - Peak non-repetitive pulse power handling; supports IEC 61000-4-5 Level 4 surges in compact SMB footprint. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering. |
| Response time | <1.0 ps - Sub-picosecond junction response enables effective suppression of fast ESD events (IEC 61000-4-2). |
| TJ max | +150 °C - Maximum junction temperature; allows use in under-hood automotive and industrial environments. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration. Cathode indicated by molded band on case. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes conduction path during reverse transient clamp. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 12 V rail); polarity mark aligns with cathode band for correct orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Validated for automotive electrical transient immunity (Pulse 1, 2a, 2b, 3a, 3b), enabling direct use in vehicle ECUs. |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; supports standard SMT assembly without floor-life constraints. |
| UL 94V-0 molding compound | Self-extinguishing encapsulation meets fire-safety standards for industrial and transportation equipment. |
| Fast response <1.0 ps | Clamps ESD events before IC damage thresholds are exceeded, critical for protecting USB, CAN, and sensor interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied control module exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to shunt surge energy away from LDOs and microcontrollers. Use Value: Clamps 600 W transients to ≤27.6 V, preventing overvoltage damage to downstream 3.3 V/5 V logic while surviving repeated ISO 7637-2 pulses. |
Use Scenario: 4–20 mA current-loop transmitter interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS mounted across loop terminals to absorb induced surges from nearby motor switching or lightning-induced coupling. Use Value: With 1 µA leakage at 17 V, it avoids disturbing loop accuracy; 22.8 A IPP handles 1 kV/500 A surge per IEC 61000-4-5. |
| LED Driver Overvoltage Clamp | USB Port ESD Suppression |
|
Use Scenario: Constant-current LED driver board powered from 24 V supply in outdoor signage. IC Role / Device Role / Timing Role: SMBJ17A placed across input capacitor to limit transient overvoltage during hot-plug or inductive kickback. Use Value: 27.6 V clamping prevents MOSFET gate oxide rupture and maintains driver IC integrity during 10/1000 µs surges up to 600 W. |
Use Scenario: USB 2.0 Type-A port on embedded host controller exposed to human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line to clamp ESD strikes before reaching USB PHY and power switch. Use Value: Sub-1 ps response captures HBM events (±15 kV) before propagation; 1 µA leakage avoids VBUS droop during enumeration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ17A | Same DO-214AC (SMA) package; VBR = 18.9–20.9 V, VC = 27.6 V @ 22.8 A, but PPK = 400 W (lower than SMBJ17A's 600 W). | Lower power rating limits use in high-energy automotive load-dump scenarios where SMBJ17A's 600 W is required. | Select SMBJ17A when 600 W surge handling is mandatory; SMAJ17A suits space-constrained designs where 400 W suffices. |
| ON Semiconductor 1.5SMC17A | DO-214AB (SMC) package (larger footprint); identical VWM/VBR/VC specs, but higher thermal mass yields RθJA = 35 °C/W vs. SMBJ17A's 55 °C/W. | SMC package offers better power dissipation in high-ambient-temperature environments but requires larger PCB area. | Choose SMBJ17A for SMB footprint compatibility and cost-sensitive volume production; 1.5SMC17A where thermal derating is critical. |
Compared with SMAJ17A and 1.5SMC17A, SMBJ17A uniquely balances 600 W surge capability, DO-214AA (SMB) compactness, and industry-standard ISO 7637-2 validation-making it optimal for automotive body electronics and industrial I/O modules where board space and transient energy coexist as constraints.
Availability
SMBJ17A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver overvoltage clamping requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SMBJ17A 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, with global distribution and AEC-Q200 qualified product lines.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial systems, emphasizing robust surge handling, tight parametric tolerances, and seamless SMT manufacturability.
FAQ
What is the polarity configuration of SMBJ17A?
SMBJ17A is a unidirectional TVS diode, with cathode identified by a molded band on the DO-214AA (SMB) package. It conducts only during reverse-biased transients-i.e., when the cathode is at higher potential than the anode-and blocks forward current like a standard diode. This configuration is confirmed in the "Devices for Bipolar Applications" section of the datasheet, which explicitly assigns the "A" suffix to unidirectional variants.
Does SMBJ17A meet automotive transient immunity standards?
Yes, SMBJ17A is verified to meet ISO 7637-2 for automotive electrical transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a (capacitive coupled noise), and Pulse 3b (supply line noise). This compliance is explicitly stated in the FEATURES section and validated per test waveforms defined in the standard.
What is the maximum clamping voltage of SMBJ17A under surge conditions?
The maximum clamping voltage (VC) of SMBJ17A is 27.6 V at a peak impulse current (IPP) of 22.8 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value is specified in the ELECTRICAL SPECIFICATIONS table for part number SMBJ17A and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can SMBJ17A be used in bidirectional configurations?
No-SMBJ17A is strictly unidirectional. For bidirectional operation, Taiwan Semiconductor specifies parts with "C" or "CA" suffixes (e.g., SMBJ17CA), which contain back-to-back diodes in one package. The "A" suffix in SMBJ17A denotes unidirectional construction, and the datasheet confirms electrical characteristics apply only in the reverse direction for this variant.
What is the leakage current specification for SMBJ17A at its working voltage?
SMBJ17A exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its working stand-off voltage (VWM) of 17 V, measured at TA = 25°C. This low leakage is critical for minimizing standby power loss in battery-powered systems and avoiding false triggering in high-impedance sensing circuits.
SMBJ17A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- 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)
SMBJ17A FAQ
1.How can I place an order for SMBJ17A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17A 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 SMBJ17A reliable?
The price and inventory of SMBJ17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17A is usually 5 days.
3.What payment methods are accepted for SMBJ17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17A?
SMBJ17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17A 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 SMBJ17A?
For technical support, including SMBJ17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17A requirements.
6.How does Aetrix verify that SMBJ17A is sourced from the original manufacturer or authorized distributors?
All SMBJ17A 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 SMBJ17A meets industry standards.
7.What is the process for return or replacement of SMBJ17A?
All SMBJ17A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17A, 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 SMBJ17A part is unused and in its original packaging.
Return procedure for SMBJ17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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