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Taiwan Semiconductor Corporation SMBJ17AH
- Part No.:
- SMBJ17AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17AH.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,994
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Product details
Overview
SMBJ17AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 17V working stand-off voltage (VWM), and 27.6V maximum clamping voltage (VC) at 22.8A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ17AH datasheet, SMBJ17AH pinout, SMBJ17AH application, or SMBJ17AH equivalent, key selection criteria include clamping performance under 10/1000µs surge, AEC-Q101 qualification for automotive use, low leakage (<1µA @ 17V), and thermal resistance (RθJA = 55°C/W) in high-density PCB layouts.
Technical Context
The SMBJ17AH employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps), with breakdown voltage specified at 18.9–20.9V (IT = 1mA). Its unidirectional configuration provides forward conduction only, requiring correct cathode orientation during placement.
Thermal design is constrained by RθJC = 10°C/W and RθJA = 55°C/W, limiting steady-state dissipation to 3W at 25°C ambient. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 18.9 / 20.9 V @ IT = 1 mA - Ensures reliable turn-on margin above VWM |
| VC @ IPP | 27.6 V @ 22.8 A - Clamping voltage limits downstream IC stress during 10/1000µs surge |
| PPK | 600 W - Peak pulse power handling per single 10/1000µs transient event |
| ID @ VWM | <1 µA - Minimal leakage preserves battery life and signal integrity in always-on systems |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated assembly |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; two-terminal device with anode and cathode leads. Matte tin-plated terminals meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit point in forward bias; marked with band | Connected to protected line (e.g., 12V rail); clamps to anode when overvoltage occurs |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress |
| Fast response time <1.0 ps | Clamps transients before sensitive logic or analog circuits experience overstress |
| ISO 7637-2 compliance | Withstands standardized automotive load-dump and inductive-switching pulses without degradation |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU directives for environmentally restricted substances |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before reaching PMIC or MCU input. Use Value: Limits clamping voltage to 27.6V, protecting 30V-rated input stages while surviving 600W transients per ISO 7637-2 Pulse 5a. | Use Scenario: 4–20mA current-loop sensors connected to PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS on sensor supply line to absorb EFT bursts (IEC 61000-4-4) and cable-coupled noise. Use Value: Sub-1µA leakage avoids disturbing loop accuracy; 22.8A IPP handles repetitive 5kHz EFT bursts without degradation. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Protection |
Use Scenario: Constant-current LED drivers in automotive lighting subjected to ignition transients. IC Role / Device Role / Timing Role: TVS across input capacitor to prevent overvoltage failure of MOSFET gate drivers and current-sense amplifiers. Use Value: 27.6V clamping ensures driver ICs with 30V ABS MAX ratings remain within safe operating area during 100V/10ms load dump events. | Use Scenario: Buck converter input stage in industrial HMIs powered from 24V DC bus. IC Role / Device Role / Timing Role: Primary surge protection ahead of input filter and controller IC. Use Value: 600W PPK rating absorbs energy from inductive switching spikes without thermal runaway; DO-214AA footprint enables compact layout near connector entry point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ17A | Same DO-214AC (SMA) package; slightly higher VC = 28.8V @ 21.2A; RθJA = 65°C/W | Lower power density due to larger thermal resistance; less suitable for high-ambient automotive modules | Select SMAJ17A only if DO-214AC footprint is already standardized and thermal margin exceeds 15°C/W |
| Vishay SMF17A | DO-219AB (SOD-123FL) package; lower PPK = 400W; VC = 27.7V @ 14.5A | Reduced surge capability limits use to non-automotive, low-energy interfaces like USB or I/O lines | Choose SMF17A for space-constrained consumer electronics where 400W surge immunity suffices |
Compared with SMAJ17A and SMF17A, SMBJ17AH delivers superior 600W surge handling in a thermally efficient DO-214AA package with AEC-Q101 validation - making it the preferred choice for automotive power rail protection where clamping voltage, reliability, and thermal performance are jointly critical.
Availability
SMBJ17AH is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, LED lighting drivers, and DC-DC converter input protection requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMBJ17AH 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 computing markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping voltage, robust thermal performance, and compatibility with automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ17AH and under what test condition?
The SMBJ17AH has a maximum clamping voltage (VC) of 27.6 V, measured at a peak impulse current (IPP) of 22.8 A using a 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMBJ17AH suitable for bidirectional transient protection?
No, SMBJ17AH is a unidirectional TVS diode and is not suitable for bidirectional protection. For bipolar applications, Taiwan Semiconductor offers the SMBJ17CAH variant with symmetrical breakdown in both directions. Using SMBJ17AH in reverse-biased AC or data-line applications risks permanent failure due to lack of reverse conduction capability.
Does SMBJ17AH meet automotive qualification standards?
Yes, SMBJ17AH is AEC-Q101 qualified and tested for automotive-grade reliability, including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD). It also complies with ISO 7637-2 for electrical transient immunity in vehicle power networks, confirming suitability for under-hood and body-control module applications.
What is the leakage current specification for SMBJ17AH at its working voltage?
The SMBJ17AH exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its rated working stand-off voltage (VWM) of 17 V. This low leakage supports energy-sensitive designs such as battery-backed systems and precision analog front-ends where standby current must be minimized.
How does the thermal resistance of SMBJ17AH affect PCB layout decisions?
SMBJ17AH has a junction-to-ambient thermal resistance (RθJA) of 55°C/W, meaning each watt dissipated raises the junction temperature by 55°C above ambient. To maintain TJ ≤ 150°C in a 85°C ambient environment, layout must provide adequate copper area and thermal vias - especially critical in automotive modules where sustained surge duty cycles may occur.
SMBJ17AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 22.8A
- 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 (SMB)
SMBJ17AH FAQ
1.How can I place an order for SMBJ17AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17AH 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 SMBJ17AH reliable?
The price and inventory of SMBJ17AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17AH is usually 5 days.
3.What payment methods are accepted for SMBJ17AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17AH?
SMBJ17AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17AH 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 SMBJ17AH?
For technical support, including SMBJ17AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17AH requirements.
6.How does Aetrix verify that SMBJ17AH is sourced from the original manufacturer or authorized distributors?
All SMBJ17AH 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 SMBJ17AH meets industry standards.
7.What is the process for return or replacement of SMBJ17AH?
All SMBJ17AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17AH, 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 SMBJ17AH part is unused and in its original packaging.
Return procedure for SMBJ17AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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