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Taiwan Semiconductor Corporation SMBJ26C
- Part No.:
- SMBJ26C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ26C.pdf
- Description:
- 600W, 32.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,735
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Product details
Overview
SMBJ26C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 26V working stand-off voltage (VWM), 42.1V maximum clamping voltage (VC@IPP) at 14.9A peak pulse current, and sub-1ps response time - deployed in automotive infotainment power inputs and industrial PLC I/O modules.
For engineers reviewing the SMBJ26C datasheet, SMBJ26C pinout, SMBJ26C application, or SMBJ26C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-214AA (SMB) package thermal resistance (RθJA = 55°C/W), and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The SMBJ26C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 28.9–31.9V breakdown range (VBR@IT = 1mA). Its glass-passivated junction ensures stable leakage (<1µA at 26V) and robust ESD immunity up to ±30kV (HBM).
It delivers 600W non-repetitive peak pulse power (10/1000µs waveform) with a clamping ratio of 1.62 (VC/VBR max), enabling effective protection of 24V systems against load dump and inductive switching transients without forward conduction during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; sets system DC rail compatibility. |
| VBR min/max | 28.9 V / 31.9 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance. |
| VC@IPP | 42.1 V - Clamps transients to ≤42.1 V at 14.9 A peak current; determines protected IC's voltage stress margin. |
| PPK | 600 W - Peak pulse power handling per 10/1000 µs waveform; qualifies for ISO 7637-2 Pulse 1 & 2b. |
| ID@VWM | <1 µA - Reverse leakage at 26 V; ensures minimal standby power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs PCB copper area requirements for thermal relief. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration. Cathode indicated by molded band on case body. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts only during forward surge events (rare in unidirectional use). |
| Cathode | Reverse clamping terminal | Connected to protected line (e.g., 24V rail); avalanches into low-impedance state when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping voltage (VC) | 42.1 V at 14.9 A - Limits transient overvoltage to safe levels for downstream 30V-rated ICs (e.g., CAN transceivers, MCU I/O). |
| Response time | <1 ps - Enables suppression before ESD or fast transients propagate into sensitive circuitry. |
| ISO 7637-2 compliance | Pulse 1, 2a, 2b, 3a, 3b - Validated for automotive load dump, alternator ripple, and inductive switch-off events. |
| Moisture sensitivity | J-STD-020 Level 1 - No bake requirement prior to reflow; compatible with standard SMT assembly lines. |
| Leakage current | <1 µA at 26 V - Prevents measurable power drain in always-on 24V systems (e.g., telematics, ADAS sensors). |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24V supply input of head unit control module against load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, clamping transients before they reach DC-DC converter input. Use Value: Limits peak voltage to 42.1 V, ensuring input stage MOSFETs and regulators remain within SOA limits during 120V/100ms transients. |
Use Scenario: Shielding 24V digital input channels of programmable logic controller against inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: TVS mounted at field-side connector, shunting energy from relay coil flyback into ground plane. Use Value: Sub-1ps response prevents latch-up in optocoupler input stages; 600W rating absorbs 100mJ pulses without degradation. |
| LED Driver Power Rail Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Safeguarding constant-current LED driver ICs in streetlight controllers exposed to lightning-induced surges on AC/DC input. IC Role / Device Role / Timing Role: Primary-level TVS on bulk capacitor input, absorbing differential-mode transients before upstream rectifier. Use Value: 26V VWM matches 24V nominal bus; 42.1V VC ensures driver IC's 45V absolute max rating is never exceeded. |
Use Scenario: Protecting RS-485 transceiver (e.g., THVD1550) data lines in factory automation networks from EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMBJ26C used on power supply rail (VCC) of transceiver, not signal lines. Use Value: Clamps 24V rail to ≤42.1V during EFT (IEC 61000-4-4), preventing brownout reset or internal LDO failure in transceiver. |
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 SMAJ26A | VBR = 28.9–31.9 V (same), VC = 42.1 V (same), but PPK = 400 W vs. 600 W; RθJA = 65°C/W vs. 55°C/W. | Lower power rating restricts use in high-energy ISO 7637-2 Pulse 2b scenarios; requires larger copper pour for thermal management. | Select SMBJ26C where full 600W surge margin or tighter thermal design is required. |
| ON Semiconductor SMCJ26A | VBR = 28.9–31.9 V (same), VC = 42.1 V (same), PPK = 1500 W, but DO-214AB (SMC) package (larger footprint, higher RθJA = 35°C/W). | Higher power rating enables extended surge endurance, but 7.11 × 6.22 mm SMC footprint incompatible with SMB land pattern. | Choose SMBJ26C for space-constrained 24V designs requiring DO-214AA footprint and verified 600W capability. |
Compared with SMAJ26A and SMCJ26A, SMBJ26C uniquely balances 600W surge capacity, DO-214AA footprint compatibility, and 55°C/W thermal resistance - making it optimal for compact 24V automotive and industrial modules where board area and thermal budget are constrained.
Availability
SMBJ26C is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial PLC digital I/O protection, and LED driver power rail protection requiring stable component supply across production lifecycles.
Supply support for SMBJ26C 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 TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMBJ series was engineered specifically for high-reliability 24V/48V system surge protection, emphasizing low clamping voltage, tight VBR tolerance, and AEC-Q200 readiness for under-hood and factory-floor deployment.
FAQ
What is the polarity configuration of SMBJ26C?
SMBJ26C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package body. It conducts only in reverse bias above VBR and blocks forward current up to 3.5V (per SMBJ26C's VF spec). This polarity enables targeted protection of positive-rail systems without interfering with normal forward operation.
Does SMBJ26C meet automotive surge immunity standards?
Yes, SMBJ26C meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (battery connection bounce). Its 600W rating and 42.1V clamping voltage are validated for these waveforms per manufacturer testing.
What is the maximum junction temperature for SMBJ26C?
The maximum junction temperature (TJ max) for SMBJ26C is +150°C. This rating allows reliable operation in under-hood automotive environments and enclosed industrial enclosures, provided PCB thermal design maintains junction temperature below this limit using the specified RθJA = 55°C/W.
How does SMBJ26C compare to bidirectional variants like SMBJ26CA?
SMBJ26C is unidirectional; SMBJ26CA is bidirectional with symmetrical clamping in both polarities. SMBJ26C offers lower leakage (<1 µA at 26V) and is preferred for DC power rail protection, while SMBJ26CA suits AC-coupled or floating signal lines. They share identical VWM, VBR, and VC specs but differ in polarity marking and application scope.
Is SMBJ26C compliant with RoHS and halogen-free requirements?
Yes, SMBJ26C is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability standards - confirming suitability for lead-free reflow processes and environmentally regulated markets.
SMBJ26C 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:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ26C FAQ
1.How can I place an order for SMBJ26C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ26C 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 SMBJ26C reliable?
The price and inventory of SMBJ26C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ26C is usually 5 days.
3.What payment methods are accepted for SMBJ26C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ26C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ26C?
SMBJ26C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ26C 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 SMBJ26C?
For technical support, including SMBJ26C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ26C requirements.
6.How does Aetrix verify that SMBJ26C is sourced from the original manufacturer or authorized distributors?
All SMBJ26C 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 SMBJ26C meets industry standards.
7.What is the process for return or replacement of SMBJ26C?
All SMBJ26C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ26C, 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 SMBJ26C part is unused and in its original packaging.
Return procedure for SMBJ26C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ26C Tags
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