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Taiwan Semiconductor Corporation SMBJ20CH
- Part No.:
- SMBJ20CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CH.pdf
- Description:
- 600W, 24.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,965
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Product details
Overview
SMBJ20CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 20 V working stand-off voltage (VWM), 22.2–27.1 V breakdown voltage (VBR), 35.8 V maximum clamping voltage (VC) at 17.6 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ20CH datasheet, SMBJ20CH pinout, SMBJ20CH application, or SMBJ20CH equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, low leakage (<1 µA at 20 V), and DO-214AA thermal performance (RθJA = 55 °C/W).
Technical Context
The SMBJ20CH is a unidirectional/bidirectional TVS diode configured as a single die in a glass-passivated junction structure. Its bidirectional operation (denoted by 'CH' suffix) enables symmetrical clamping in both polarities without external polarity reversal, supporting robust protection of differential buses and AC-coupled signal lines.
It delivers fast transient suppression with <1 ps response time and meets stringent automotive immunity standards including ISO 7637-2 for load dump and inductive switching transients. Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W ratings, enabling reliable operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 22.2 V / 27.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC @ IPP | 35.8 V at 17.6 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform, derated above 25 °C |
| ID @ VWM | <1 µA - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature enabling under-hood and industrial ambient deployment |
| Package | DO-214AA (SMB) - Surface-mount outline with 0.090 g mass, UL 94V-0 molding, and matte tin leads |
Pinout & Package
DO-214AA (SMB) package: surface-mount, molded plastic case with cathode band marking; terminals are anode and cathode - bidirectional operation means both terminals function symmetrically as clamping nodes with no fixed polarity assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Clamping node (bidirectional) | Functions identically to cathode under reverse or forward surge; cathode band indicates terminal orientation only, not functional polarity |
| Cathode (unmarked side) | Clamping node (bidirectional) | Same clamping behavior as anode; bidirectional symmetry eliminates need for polarity-aware layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance transients) |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| Sub-1 ps response time | Enables protection of high-speed interfaces (e.g., CAN FD, LIN) before transient energy couples into ICs |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device placed at board-level input filter stage, shunting surge energy to ground before reaching DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤35.8 V during 17.6 A surges, preventing latch-up or overvoltage damage to downstream 3.3 V/5 V logic. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in factory automation PLC modules exposed to relay coil kickback. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential sensor lines (e.g., RS-485, 4–20 mA loop), suppressing ±1 kV EFT bursts. Use Value: Maintains signal fidelity by clamping transients within 1 ps while adding <1 µA leakage, avoiding baseline drift in precision measurement paths. |
| LED Lighting Driver Protection | Automotive CAN Bus Transceiver Protection |
Use Scenario: Shielding constant-current LED drivers from inductive switching spikes generated by MOSFET gate drive circuits. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals, absorbing repetitive 600 W pulses without degradation. Use Value: Extends driver IC lifetime by limiting peak voltage to 35.8 V during 10/1000 µs transients, meeting IEC 61000-4-4 Level 4 immunity. | Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TJA1044) from ESD events and bus faults in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between CANH/CANL lines and ground, providing symmetrical surge suppression. Use Value: Ensures bus continuity by clamping ±35.8 V surges without forward conduction, preserving signal integrity up to 5 Mbps. |
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 SMAJ20CA | Same DO-214AC (SMA) package; slightly higher VC = 37.5 V at 16.7 A; RθJA = 65 °C/W | Lower power density due to larger thermal resistance; less suitable for high-ambient-density PCBs | Select when legacy SMA footprint compatibility is required and thermal margin >10 °C is available |
| Vishay SMF20A | DO-219AB (SOD-123FL) package; lower PPK = 400 W; VC = 32.4 V at 12.3 A | Smaller footprint but reduced surge capacity; not AEC-Q101 qualified | Select for space-constrained consumer designs where automotive qualification is unnecessary |
Compared with SMAJ20CA and SMF20A, the SMBJ20CH offers superior thermal performance (RθJA = 55 °C/W), full AEC-Q101 qualification, and higher 600 W surge rating-making it optimal for automotive power rail and industrial control applications demanding reliability under sustained thermal stress.
Availability
SMBJ20CH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ20CH 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, and rectifiers with global distribution and AEC-Q101 validation capabilities.
The SMBJH series was engineered specifically for automotive and industrial transient suppression, emphasizing high-power clamping, fast response, and robust packaging for under-hood and factory-floor environments.
FAQ
What does the 'CH' suffix indicate in SMBJ20CH?
The 'CH' suffix in SMBJ20CH denotes bidirectional configuration - meaning the device provides symmetrical clamping in both polarities without requiring external polarity alignment. Unlike unidirectional variants (e.g., SMBJ20H), SMBJ20CH has identical VBR and VC characteristics in forward and reverse directions, making it ideal for protecting AC-coupled lines like CAN, LIN, or differential sensors. This functionality is confirmed in the datasheet's "Devices for Bipolar Applications" section.
Is SMBJ20CH AEC-Q101 qualified?
Yes, SMBJ20CH is explicitly AEC-Q101 qualified as stated in the FEATURES section of the official Taiwan Semiconductor datasheet (Version A2102). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114, validating its suitability for automotive powertrain and body electronics applications where reliability under thermal and electrical stress is critical.
What is the maximum clamping voltage of SMBJ20CH and at what current is it specified?
The maximum clamping voltage (VC) of SMBJ20CH is 35.8 V, measured at a peak pulse current (IPP) of 17.6 A using the standard 10/1000 µs double-exponential waveform. This value is listed in the ELECTRICAL SPECIFICATIONS table on page 3 of the Taiwan Semiconductor SMBJH Series datasheet (A2102) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Can SMBJ20CH be used in place of a unidirectional SMBJ20H?
No - SMBJ20CH and SMBJ20H are electrically distinct: SMBJ20CH is bidirectional with symmetrical clamping, while SMBJ20H is unidirectional and conducts only in reverse bias. Substituting SMBJ20CH for SMBJ20H may cause unintended forward conduction in DC-biased rails. The datasheet confirms this distinction in the "Devices for Bipolar Applications" note, specifying separate marking codes (LU vs. CH) and divergent IV curves.
What is the thermal resistance from junction to ambient (RθJA) for SMBJ20CH?
The junction-to-ambient thermal resistance (RθJA) for SMBJ20CH is 55 °C/W, as specified in the THERMAL PERFORMANCE table of the Taiwan Semiconductor SMBJH Series datasheet (Version A2102). This value assumes standard JEDEC high-K test board conditions and is critical for calculating safe power dissipation limits in real-world PCB layouts with defined copper area and airflow.
SMBJ20CH 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 17.6A
- 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)
SMBJ20CH FAQ
1.How can I place an order for SMBJ20CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CH 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 SMBJ20CH reliable?
The price and inventory of SMBJ20CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CH is usually 5 days.
3.What payment methods are accepted for SMBJ20CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CH?
SMBJ20CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CH 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 SMBJ20CH?
For technical support, including SMBJ20CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CH requirements.
6.How does Aetrix verify that SMBJ20CH is sourced from the original manufacturer or authorized distributors?
All SMBJ20CH 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 SMBJ20CH meets industry standards.
7.What is the process for return or replacement of SMBJ20CH?
All SMBJ20CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CH, 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 SMBJ20CH part is unused and in its original packaging.
Return procedure for SMBJ20CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CH Tags
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