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Taiwan Semiconductor Corporation SMBJ24
- Part No.:
- SMBJ24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24.pdf
- Description:
- 600W, 29.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,905
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Product details
Overview
SMBJ24 from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power lines and signal paths. It features a 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR @ 1mA), 43.0V maximum clamping voltage (VC @ 14.6A), and <1μA leakage current at VWM - deployed in automotive body electronics, industrial I/O modules, and PoE-powered devices.
For engineers reviewing the SMBJ24 datasheet, SMBJ24 pinout, SMBJ24 application, or SMBJ24 equivalent, key selection criteria include clamping performance under 10/1000µs transients, thermal derating above 25°C ambient, unidirectional polarity marking, and compatibility with J-STD-020 Level 1 moisture sensitivity handling.
Technical Context
The SMBJ24 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response (<1.0ps) to ESD and lightning-induced surges. Its unidirectional configuration provides forward conduction only during reverse overvoltage events, with VF = 3.5V at 50A for this voltage grade (per spec note).
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, supporting steady-state dissipation up to 3W at 25°C ambient. It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive-switching immunity testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR min/max | 26.7 / 32.6 V @ 1 mA - Ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPP | 43.0 V @ 14.6 A (10/1000µs) - Clamped voltage seen by protected circuit during worst-case surge |
| ID @ VWM | <1 µA - Minimal standby power loss and negligible loading on 24V supply rails |
| PPK | 600 W - Peak non-repetitive surge energy absorption capability per single event |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package: cathode-banded end denotes the cathode terminal; anode is the unmarked lead. Matte tin-plated leads meet J-STD-002 solderability requirements. Polarity marking is laser-etched or molded; orientation aligns with JEDEC standard for unidirectional TVS devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; defines clamping reference point |
| Cathode | Protected line input | Connected to 24V rail or signal line; conducts surge current to ground when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and long-term reliability in humid environments |
| Fast response time <1.0 ps | Clamps ESD events before sensitive ICs experience latch-up or gate oxide damage |
| ISO 7637-2 compliance | Validated for automotive battery-line transients including load dump (Pulse 5a/b) and inductive switching (Pulse 1/2a/2b) |
| J-STD-020 Level 1 moisture sensitivity | Enables direct placement without baking; supports standard reflow profiles (peak ≤260°C) |
| UL 94V-0 molding compound | Prevents flame propagation in safety-critical enclosures per IEC 62368-1 |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power rails from load-dump surges during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V supply and local LDO input, clamping transients before they reach downstream regulators. Use Value: Limits clamped voltage to 43.0V, keeping input to 5V LDO within safe absolute maximum rating while surviving 600W peak pulses. |
Use Scenario: Shields 24V digital input optocoupler circuits from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end surge clamp on dry-contact input lines, absorbing inductive kickback from solenoid or relay coils. Use Value: With 14.6A peak impulse current rating, absorbs >99% of 10/1000µs surges per IEC 61000-4-5 Level 4 without degradation. |
| Power over Ethernet (PoE) Midspan Injector | LED Streetlight Driver Board |
Use Scenario: Guards 24V auxiliary power rails feeding PoE controller ICs against cross-talk and cable discharge events. IC Role / Device Role / Timing Role: Secondary-level TVS on DC-DC converter output, complementing primary-side MOVs and common-mode chokes. Use Value: Sub-1µA leakage avoids unnecessary quiescent current draw on always-on PoE management circuits. |
Use Scenario: Safeguards constant-current LED driver ICs from lightning-induced surges conducted via AC mains or street-level grounding loops. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input terminals, conducting surge energy to chassis ground during fast-rising transients. Use Value: 43.0V clamping ensures driver ICs rated for 45V absolute max remain within safe operating area during 6kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower VBR range (26.7–29.5V vs. 26.7–32.6V); tighter 5% tolerance; same VC = 38.9V @ 16.0A | Better suited for precision 24V systems where tighter VBR matching reduces false triggering risk | Select SMBJ24A when VBR consistency across production lots is critical; SMBJ24 offers wider margin for cost-sensitive designs |
| SMAJ24 | Lower PPK = 400W; same VWM/VBR/VC specs but reduced surge capacity; SMA package (smaller footprint) | Acceptable for lower-energy environments (e.g., consumer-grade 24V adapters), not automotive or industrial mains-connected equipment | Choose SMAJ24 only if space constraints outweigh surge robustness requirements; SMBJ24 delivers 50% higher energy absorption |
Compared with SMBJ24A and SMAJ24, the SMBJ24 balances broad VBR tolerance, 600W surge rating, and DO-214AA mechanical robustness - making it optimal for cost-sensitive yet reliability-demanding 24V industrial and automotive applications where full ISO 7637-2 compliance is mandatory.
Availability
SMBJ24 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and PoE midspan power conditioning requiring stable component supply and full traceability.
Supply support for SMBJ24 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, MOSFETs, and power management components.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial control, and telecom infrastructure where ISO 7637-2 and J-STD-020 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ24 under a 10/1000µs surge?
The SMBJ24 has a maximum clamping voltage (VC) of 43.0 V when subjected to a 14.6 A peak impulse current with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected downstream ICs remain within their absolute maximum voltage ratings during standardized surge events.
Is SMBJ24 unidirectional or bidirectional?
SMBJ24 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only during reverse-biased overvoltage conditions - i.e., when cathode voltage exceeds anode voltage by more than VBR. Forward conduction occurs at ~3.5 V per datasheet note 2.
Does SMBJ24 meet automotive surge immunity standards?
Yes, SMBJ24 meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (capacitive coupling) requirements. Its 600W peak power rating and thermal design support sustained operation in automotive under-hood environments up to +125°C ambient.
What is the moisture sensitivity level (MSL) of SMBJ24?
SMBJ24 is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and placed directly into reflow without baking. This simplifies manufacturing logistics and eliminates pre-reflow moisture mitigation steps for high-volume SMT assembly.
How does SMBJ24 differ from SMBJ24A?
SMBJ24A has a tighter breakdown voltage tolerance (26.7–29.5 V vs. 26.7–32.6 V for SMBJ24) and slightly lower clamping voltage (38.9 V vs. 43.0 V). Both share identical package, power rating, and thermal specs. SMBJ24 offers broader VBR margin for cost-driven applications; SMBJ24A suits precision 24V systems.
SMBJ24 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 14.6A
- 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)
SMBJ24 FAQ
1.How can I place an order for SMBJ24 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24 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 SMBJ24 reliable?
The price and inventory of SMBJ24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24 is usually 5 days.
3.What payment methods are accepted for SMBJ24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24?
SMBJ24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24 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 SMBJ24?
For technical support, including SMBJ24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24 requirements.
6.How does Aetrix verify that SMBJ24 is sourced from the original manufacturer or authorized distributors?
All SMBJ24 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 SMBJ24 meets industry standards.
7.What is the process for return or replacement of SMBJ24?
All SMBJ24 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24, 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 SMBJ24 part is unused and in its original packaging.
Return procedure for SMBJ24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24 Tags
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