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Taiwan Semiconductor Corporation SMBJ17CH
- Part No.:
- SMBJ17CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17CH.pdf
- Description:
- 600W, 21V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:3,267
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Product details
Overview
SMBJ17CH from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 17V working stand-off voltage (VWM), 18.9–23.1V breakdown voltage (VBR @ 1mA), 30.5V maximum clamping voltage (VC) at 20A peak pulse current, and AEC-Q101 qualification for under-hood and infotainment system protection.
For engineers reviewing the SMBJ17CH datasheet, SMBJ17CH pinout, SMBJ17CH application, or SMBJ17CH equivalent, this page delivers verified electrical parameters, bidirectional variant compatibility notes, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance data, thermal resistance values (RθJC = 10°C/W), and real-world clamping performance under 10/1000µs transients.
Technical Context
The SMBJ17CH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response to fast transients. Its 17V VWM ensures reliable blocking during normal 12V automotive supply operation while maintaining low leakage (<1µA above 10V).
It meets ISO 7637-2 immunity requirements for automotive electronics and supports high-reliability applications via JESD201 Class 2 whisker resistance, UL 94V-0 molding compound, and moisture sensitivity level 1 (MSL-1) handling - all validated per AEC-Q101 stress testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; matches nominal 12V system rail with safety margin. |
| VBR min/max | 18.9 / 23.1 V @ 1 mA - Confirmed breakdown range ensures predictable turn-on during overvoltage events. |
| VC @ IPP | 30.5 V @ 20 A - Clamping voltage limits downstream IC stress during 10/1000µs surges (IEC 61000-4-5 Level 4 equivalent). |
| PPK | 600 W - Peak pulse power rating defines maximum single-event energy absorption capability. |
| RθJC | 10 °C/W - Junction-to-case thermal resistance enables effective heat transfer to PCB copper when mounted per recommended pad layout. |
| TJ max | +150 °C - Maximum junction temperature supports operation in under-hood environments without derating at TA ≤ 85°C. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life in always-on automotive modules. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability; weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms clamping loop with cathode during transient suppression. |
| Cathode | High-side input terminal | Connected to protected line (e.g., CAN_H, LIN, sensor supply); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature (-55°C to +150°C), humidity, vibration, and ESD stress per JEDEC standards. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and high-humidity conditions. |
| Fast response time | <1 ps typical - Enables suppression of nanosecond-scale ESD events before sensitive logic or analog circuitry is damaged. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs. |
Applications
| Automotive Infotainment Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12V supply inputs to head unit MCUs, display drivers, and audio amplifiers against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive-going surges while blocking normal DC operation. Use Value: Limits voltage excursion to ≤30.5V during 600W transients, preventing latch-up or gate oxide damage in downstream 3.3V/5V logic. |
Use Scenario: Safeguarding CAN_H and CAN_L lines in body control modules against ESD and coupled noise from adjacent high-current circuits. IC Role / Device Role / Timing Role: Paired unidirectional SMBJ17CH devices (one per line) referenced to common ground provide asymmetric clamping aligned with CAN differential signaling. Use Value: Sub-1ps response ensures clamping initiates before CAN transceiver input stages experience destructive overvoltage beyond ±40V absolute max ratings. |
| LED Headlamp Driver Output Protection | Industrial Sensor Signal Line Guarding |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when switching high-power loads (e.g., DRL or fog lamps). IC Role / Device Role / Timing Role: Placed across driver output and chassis ground to absorb reverse EMF spikes generated by lamp coil inductance. Use Value: Withstands 100A peak forward surge (IFSM) and clamps at 30.5V, protecting MOSFET switches and current-sense resistors from voltage overshoot. |
Use Scenario: Securing 4–20mA or 0–10V analog sensor outputs in factory automation systems exposed to relay contact bounce and motor drive noise. IC Role / Device Role / Timing Role: Connected between signal line and system ground to shunt fast transients induced by nearby AC wiring or solenoid actuation. Use Value: Low 17V VWM avoids interference with normal 10V full-scale signals while clamping >200V spikes to safe levels below ADC input limits. |
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 | Bidirectional configuration; identical VWM (17V), but symmetric clamping (VC = 27.6V @ 22.8A); slightly lower PPK (400W). | Preferred where bidirectional surges occur (e.g., AC-coupled data lines); not suitable for polarity-sensitive DC rails without redesign. | Select SMAJ17A only if bidirectional protection is required and 400W rating suffices; verify layout accommodates same DO-214AA footprint. |
| ON Semiconductor SMCJ17A | Same DO-214AB (SMC) package - larger than SMB; higher PPK (1500W); VBR (18.9–23.1V) and VC (30.5V) match SMBJ17CH exactly. | Used where higher surge margin is needed (e.g., engine control units); requires PCB pad revision due to larger body size and lead spacing. | Choose SMCJ17A for enhanced robustness in high-energy environments; confirm mechanical clearance and thermal pad area support larger SMC outline. |
Compared with SMAJ17A and SMCJ17A, the SMBJ17CH offers optimal balance of AEC-Q101 compliance, compact DO-214AA footprint, and precise 600W/30.5V clamping for space-constrained 12V automotive nodes - making it ideal for infotainment, lighting, and sensor interface protection without layout change or derating compromise.
Availability
SMBJ17CH is available at Aetrix Electronics and suitable for automotive infotainment systems, CAN bus interfaces, and LED lighting drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ17CH 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 high-reliability protection devices and power components.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting ESD, load dump, and ISO 7637-2 pulse immunity in 12V/24V vehicle subsystems.
FAQ
What is the polarity configuration of SMBJ17CH?
The SMBJ17CH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package body. It conducts only during positive transients on the cathode side relative to anode (ground), making it suitable for DC power rail protection where polarity is fixed. This differs from bidirectional variants like SMBJ17CAH, which protect both polarities without regard to line orientation.
Does SMBJ17CH meet automotive qualification standards?
Yes, SMBJ17CH is AEC-Q101 qualified and tested for temperature cycling, humidity bias, mechanical shock, and ESD per JEDEC standards. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming suitability for engine bay, chassis, and cabin electronics in passenger and commercial vehicles.
What is the maximum clamping voltage of SMBJ17CH under surge conditions?
The SMBJ17CH has a maximum clamping voltage (VC) of 30.5 V at 20 A peak pulse current (IPP), measured using the standard 10/1000 µs waveform. This value is guaranteed across temperature and ensures protected ICs see no more than 30.5 V during worst-case transients, well within safe operating limits for most 3.3 V and 5 V automotive controllers.
Can SMBJ17CH be used in bidirectional signal lines like LIN or FlexRay?
No - SMBJ17CH is unidirectional and must be paired with another device or replaced with a bidirectional variant (e.g., SMBJ17CAH) for symmetric protection on AC-coupled or polarity-agnostic buses. Using SMBJ17CH alone on such lines risks failure during negative transients, as it blocks conduction in reverse bias beyond its 17 V VWM.
What is the thermal resistance profile of SMBJ17CH and how does it affect PCB layout?
SMBJ17CH has RθJC = 10°C/W and RθJA = 55°C/W. To maintain junction temperature below 150°C during repetitive surges, the PCB must provide adequate copper area under the cathode/anode pads per TSC's suggested layout - typically ≥25 mm² per terminal with internal ground plane connection. Insufficient copper raises thermal impedance and risks premature thermal runaway.
SMBJ17CH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.5V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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)
SMBJ17CH FAQ
1.How can I place an order for SMBJ17CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17CH 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 SMBJ17CH reliable?
The price and inventory of SMBJ17CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17CH is usually 5 days.
3.What payment methods are accepted for SMBJ17CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17CH?
SMBJ17CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17CH 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 SMBJ17CH?
For technical support, including SMBJ17CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17CH requirements.
6.How does Aetrix verify that SMBJ17CH is sourced from the original manufacturer or authorized distributors?
All SMBJ17CH 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 SMBJ17CH meets industry standards.
7.What is the process for return or replacement of SMBJ17CH?
All SMBJ17CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17CH, 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 SMBJ17CH part is unused and in its original packaging.
Return procedure for SMBJ17CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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