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Taiwan Semiconductor Corporation SMBJ26CH
- Part No.:
- SMBJ26CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26CH.pdf
- Description:
- 600W, 32.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,736
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Product details
Overview
SMBJ26CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 26 V working stand-off voltage (VWM), 46.6 V maximum clamping voltage (VC) at 13.5 A peak pulse current (IPP), and 600 W peak pulse power rating with DO-214AA (SMB) package.
For engineers reviewing the SMBJ26CH datasheet, SMBJ26CH pinout, SMBJ26CH application, or SMBJ26CH equivalent, key selection criteria include unidirectional vs. bidirectional configuration (CH suffix = bidirectional), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, and clamping performance under 10/1000 µs transients.
Technical Context
The SMBJ26CH implements a silicon avalanche diode structure with glass-passivated junction for stable breakdown behavior and low leakage. Its bidirectional configuration enables symmetric clamping in AC-coupled or floating signal lines without polarity concerns.
It operates within -55°C to +150°C junction temperature range, supports 10/1000 µs surge waveforms per IEC 61000-4-5 and ISO 7637-2, and achieves sub-1 ps response time - critical for protecting CAN, LIN, and sensor interfaces against fast EFT and ESD events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 28.9 V / 35.3 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPP | 46.6 V at 13.5 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream ICs |
| PPK | 600 W - Peak pulse power handling capability under standardized surge waveform |
| IR @ VWM | <1 µA - Ultra-low leakage ensures minimal power loss in standby or battery-powered systems |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| Package | DO-214AA (SMB) - Industry-standard surface-mount outline compatible with automated assembly and IPC-7351B footprints |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMBJ26CH; terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking required; either terminal serves as anode or cathode depending on transient polarity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per JESD22 |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) without degradation |
| Fast response time <1 ps | Clamps before transient energy couples into protected circuitry - essential for high-speed data lines and microcontroller I/O |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without floor-life constraints |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Line Protection | CAN/LIN Bus Transient Suppression |
|---|---|
Use Scenario: 12 V battery rail in engine control units exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤46.6 V during 13.5 A transients, preventing latch-up or permanent damage to 5 V/3.3 V logic. | Use Scenario: Differential CAN FD bus lines subjected to EFT bursts and ISO 10605 ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS across CANH–CANL to clamp common-mode surges without disrupting differential signaling. Use Value: Sub-1 ps response preserves signal integrity; 46.6 V clamping protects transceivers rated for ±40 V common-mode range. |
| Industrial Sensor Interface Protection | LED Driver Input Surge Mitigation |
Use Scenario: 4–20 mA current loop or RS-485 interface in factory automation equipment. IC Role / Device Role / Timing Role: Symmetric protection element on twisted-pair inputs to absorb induced lightning surges. Use Value: 600 W peak power rating handles multi-kV induced transients per IEC 61000-4-5 Level 4 testing. | Use Scenario: Constant-current LED driver input subjected to AC line switching transients and capacitor discharge events. IC Role / Device Role / Timing Role: Front-end surge limiter on bulk input stage before bridge rectifier and PFC controller. Use Value: 26 V VWM aligns with 24 V nominal supply; clamping at 46.6 V prevents overvoltage failure of electrolytic input capacitors. |
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 SMAJ26CA | Same DO-214AC (SMA) package; 45.7 V VC @ 13.7 A; slightly lower RθJA (60 °C/W vs. 55 °C/W) | Identical bidirectional function but smaller footprint; lower thermal mass may reduce surge endurance in repetitive events | Select SMAJ26CA only if board space is constrained and single-event surge exposure dominates design requirements |
| Vishay SMF26A | DO-219AB (SOD-123FL) package; 42.1 V VC @ 14.2 A; 400 W PPK rating (vs. 600 W) | Lower power rating limits use to low-energy ESD-only scenarios; not suitable for ISO 7637-2 Pulse 1 or 2b | Choose SMF26A only for portable electronics where size and cost outweigh automotive-grade surge robustness |
Compared with SMAJ26CA and SMF26A, the SMBJ26CH delivers higher surge energy handling (600 W), AEC-Q101 qualification, and ISO 7637-2 compliance - making it the preferred choice for automotive power domain protection where reliability under harsh electrical environments is mandatory.
Availability
SMBJ26CH is available at Aetrix Electronics and suitable for automotive ECUs, industrial communication gateways, LED lighting drivers, and sensor interface modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SMBJ26CH 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 developed specifically for automotive and industrial transient suppression, emphasizing high-power clamping, low leakage, and robust packaging for under-hood and factory-floor deployment.
FAQ
What does the 'CH' suffix indicate in SMBJ26CH?
The 'CH' suffix in SMBJ26CH denotes a bidirectional configuration - meaning the device provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., SMBJ26H), SMBJ26CH has no cathode marking and functions identically regardless of terminal orientation in the circuit. This makes SMBJ26CH ideal for AC-coupled lines like CAN, LIN, or differential sensor interfaces where voltage polarity reverses.
Is SMBJ26CH AEC-Q101 qualified?
Yes, SMBJ26CH is explicitly AEC-Q101 qualified per the manufacturer's datasheet (Version A2102). It has undergone stress testing including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock per JESD22 standards. This qualification confirms its suitability for automotive powertrain, body control, and ADAS applications where reliability under thermal and vibration stress is mandatory - a key differentiator from commercial-grade TVS diodes.
What is the maximum clamping voltage of SMBJ26CH and at what current?
The maximum clamping voltage (VC) of SMBJ26CH is 46.6 V, measured at a peak pulse current (IPP) of 13.5 A under the standard 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and process variation per the datasheet's Electrical Specifications table. Designers use this VC value to verify that downstream components - such as 3.3 V or 5 V microcontrollers - remain within absolute maximum ratings during worst-case transients.
Does SMBJ26CH meet ISO 7637-2 requirements?
Yes, SMBJ26CH meets ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b as stated in the official datasheet. Pulse 1 simulates inductive load dump; Pulse 2a/2b models switch-off transients; Pulse 3a/3b covers EFT coupling. The device's 600 W peak power rating, low clamping voltage, and fast response ensure compliance without external filtering - enabling simplified, cost-effective protection architecture in automotive electronic control units using SMBJ26CH.
What is the thermal resistance of SMBJ26CH and how does it affect layout?
SMBJ26CH has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case (RθJC) of 10 °C/W, per the Thermal Performance section. These values assume standard PCB layout with minimum copper pad area. To maintain TJ ≤ 150 °C during repeated surges, designers must provide ≥25 mm² of 1 oz. copper connected to each terminal - especially critical in high-duty-cycle applications like motor drive feedback circuits where SMBJ26CH may experience multiple transients per second.
SMBJ26CH 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 46.6V
- Current - Peak Pulse (10/1000µs):
- 13.5A
- 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)
SMBJ26CH FAQ
1.How can I place an order for SMBJ26CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26CH 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 SMBJ26CH reliable?
The price and inventory of SMBJ26CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26CH is usually 5 days.
3.What payment methods are accepted for SMBJ26CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26CH?
SMBJ26CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26CH 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 SMBJ26CH?
For technical support, including SMBJ26CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26CH requirements.
6.How does Aetrix verify that SMBJ26CH is sourced from the original manufacturer or authorized distributors?
All SMBJ26CH 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 SMBJ26CH meets industry standards.
7.What is the process for return or replacement of SMBJ26CH?
All SMBJ26CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26CH, 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 SMBJ26CH part is unused and in its original packaging.
Return procedure for SMBJ26CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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