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Taiwan Semiconductor Corporation SMBJ24C
- Part No.:
- SMBJ24C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24C.pdf
- Description:
- 600W, 29.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,967
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Product details
Overview
SMBJ24C from Taiwan Semiconductor is a unidirectional 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 24 V working stand-off voltage (VWM), 26.7–32.6 V breakdown voltage (VBR @ 1 mA), 43.0 V maximum clamping voltage (VC @ 14.6 A), 600 W peak pulse power rating (10/1000 µs), and DO-214AA (SMB) package - deployed in automotive body control modules to protect CAN transceivers from load dump and ISO 7637-2 Pulse 5a transients.
For engineers reviewing the SMBJ24C datasheet, SMBJ24C pinout, SMBJ24C application, or SMBJ24C equivalent, key selection criteria include clamping voltage margin relative to IC absolute maximum ratings, leakage current at operating voltage, thermal derating above 25°C, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMBJ24C operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (26.7–32.6 V), then clamping transient energy to ≤43.0 V at 14.6 A peak impulse current (IPP). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 24 V).
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - suitable for lead-free reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets upper limit of protected circuit's normal operating range. |
| VBR @ IT=1 mA | 26.7–32.6 V - Breakdown threshold range; defines minimum overvoltage level at which clamping initiates under standardized test conditions. |
| VC @ IPP=14.6 A | 43.0 V - Maximum voltage seen across terminals during 10/1000 µs surge; must remain below downstream IC's absolute maximum rating. |
| PPK | 600 W - Peak pulse power handling (10/1000 µs waveform); determines survivability against high-energy transients like ISO 7637-2 Pulse 5a. |
| ID @ VWM | <1 µA - Reverse leakage at 24 V; negligible power loss and no measurable impact on low-power sensor or logic rail integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments with proper PCB copper area. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-banded end is cathode) | Connected to protected line (e.g., +12 V rail); conducts only during reverse-biased transient events. |
| Cathode | Ground/reference side | Connected to system ground or low-impedance return path; provides low-impedance shunt to divert surge current away from sensitive ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping voltage (VC) | 43.0 V at 14.6 A - Ensures protected ICs (e.g., CAN transceivers rated to 40 V abs max) remain within safe operating limits during surge events. |
| Response time | <1.0 ps - Sub-picosecond avalanche response enables suppression before transient energy couples into downstream circuitry. |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - Validated for automotive electronic module immunity testing, including battery disconnect and inductive load switching transients. |
| Moisture sensitivity | Level 1 per J-STD-020 - No floor life limitation or baking required prior to SMT assembly; simplifies manufacturing flow. |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - Meets global environmental regulations for automotive and industrial end equipment. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: 12 V battery-fed microcontroller power supply in door module exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp overvoltage spikes before they reach LDO input. Use Value: Limits voltage excursion to ≤43.0 V during 600 W surges, preventing LDO latch-up or burnout while maintaining <1 µA quiescent leakage at 12 V nominal. |
Use Scenario: CAN-H and CAN-L lines in body control unit subjected to ESD (IEC 61000-4-2) and coupled transients from nearby solenoid drivers. IC Role / Device Role / Timing Role: SMBJ24C used on CAN-H (with SMBJ24CA on CAN-L) to absorb fast-rising common-mode surges without distorting signal integrity. Use Value: Clamps transients within 1 ps while adding <1 pF junction capacitance (per Fig.5), preserving CAN bit timing and differential voltage margins. |
| Industrial Sensor Interface Protection | LED Driver Input Surge Guarding |
Use Scenario: 24 V analog sensor output (4–20 mA loop) routed through long cables in factory automation, vulnerable to induced lightning surges. IC Role / Device Role / Timing Role: Placed at sensor transmitter output to shunt surge current to local ground, protecting op-amp input stage and ADC front-end. Use Value: With VWM = 24 V and VC = 43.0 V, it tolerates normal 24 V operation while limiting fault voltage to safe levels for 3.3 V or 5 V signal chain components. |
Use Scenario: Constant-current LED driver input connected to 24 V DC supply in outdoor signage, subject to repeated switching surges and AC line coupling. IC Role / Device Role / Timing Role: Mounted across input terminals to clamp repetitive 10/1000 µs transients from relay contact bounce or inductive kickback. Use Value: Rated for 600 W non-repetitive pulses and 3 W steady-state dissipation, enabling robust protection without thermal runaway under frequent surge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower VBR range (26.7–29.5 V) and tighter tolerance; clamps at 38.9 V @ 16.0 A. | Better suited for systems requiring lower clamping voltage margin, e.g., 3.3 V logic-supplied CAN transceivers with 40 V abs max rating. | Select SMBJ24A when tighter VBR distribution and lower VC are prioritized over higher IPP headroom. |
| SAC24 | Same VWM/VBR/VC specs but in smaller SOD-123FL package; lower PPK = 400 W. | Used where board space is constrained and surge threat level is moderate (e.g., consumer IoT, not automotive). | Choose SAC24 only for space-constrained, non-automotive designs where 400 W peak power suffices and thermal mass is limited. |
Compared with SMBJ24A and SAC24, the SMBJ24C offers the highest peak power rating (600 W) and broadest VBR tolerance among 24 V SMB-packaged TVS diodes - making it the preferred choice for demanding automotive and industrial surge environments where margin and reliability are critical.
Availability
SMBJ24C is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, LED lighting drivers, and CAN bus subsystems requiring stable component supply across extended production lifecycles.
Supply support for SMBJ24C 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, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q200 qualified product lines.
The SMBJ series was engineered specifically for high-reliability transient suppression in automotive and industrial applications, emphasizing robust clamping, low leakage, and full ISO 7637-2 compliance - with SMBJ24C targeting 24 V system-level surge immunity.
FAQ
What is the polarity configuration of SMBJ24C?
The SMBJ24C is a unidirectional TVS diode, meaning it functions as a reverse-biased avalanche clamp. Its cathode is marked by a band on the DO-214AA (SMB) package body. When installed with cathode toward the protected circuit's ground reference, it remains non-conductive under normal 24 V operation but rapidly clamps reverse transients. This configuration is essential for DC rail protection where forward conduction must be avoided - unlike bidirectional variants such as SMBJ24CA.
Does SMBJ24C meet automotive qualification standards?
Yes, SMBJ24C complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms - standard requirements for electromagnetic compatibility in automotive electronic control units. While not explicitly AEC-Q200 certified in this documentation, its construction (glass-passivated junction, MSL Level 1, JESD201 Class 2 whisker resistance) and thermal rating (TJ = 150°C) align with automotive-grade reliability expectations. Always verify final qualification status with Taiwan Semiconductor's official AEC-Q200 report for SMBJ24C.
How does SMBJ24C compare to SMBJ24A in terms of clamping performance?
SMBJ24C clamps at 43.0 V under a 14.6 A 10/1000 µs surge, whereas SMBJ24A clamps at 38.9 V under 16.0 A. The lower VC of SMBJ24A provides tighter voltage limiting but at the cost of reduced VBR tolerance (26.7–29.5 V vs. 26.7–32.6 V). For systems with narrow voltage margins - such as 3.3 V CAN transceivers powered via 24 V-to-5 V conversion - SMBJ24A may offer better protection headroom. SMBJ24C remains optimal where broader VBR consistency and higher IPP capability are needed.
What is the maximum allowable ambient temperature for SMBJ24C in continuous operation?
SMBJ24C has a maximum junction temperature (TJ) of +150°C and a junction-to-ambient thermal resistance (RθJA) of 55°C/W. At full 3 W steady-state power dissipation (PD), the maximum ambient temperature is approximately +134°C - assuming ideal heatsinking. In typical PCB layouts with 1 in² 2-oz copper pour, derating begins above +70°C ambient. For automotive under-hood use, ensure adequate copper area and airflow; consult Figure 2 (Pulse Derating Curve) for transient duty-cycle limits above 25°C.
Can SMBJ24C be used in bidirectional signal line protection?
No - SMBJ24C is strictly unidirectional and unsuitable for bidirectional signal lines like RS-485 or USB D+/D− without external circuitry. For symmetric transient suppression on AC or differential signals, use the bidirectional variant SMBJ24CA (marked "24C" with center-tap cathode configuration), which exhibits identical VWM, VBR, and VC in both directions. Using SMBJ24C on a bidirectional line risks forward conduction during normal signal swings, causing malfunction or damage.
SMBJ24C 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):
- 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)
SMBJ24C FAQ
1.How can I place an order for SMBJ24C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24C 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 SMBJ24C reliable?
The price and inventory of SMBJ24C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24C is usually 5 days.
3.What payment methods are accepted for SMBJ24C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24C?
SMBJ24C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24C 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 SMBJ24C?
For technical support, including SMBJ24C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24C requirements.
6.How does Aetrix verify that SMBJ24C is sourced from the original manufacturer or authorized distributors?
All SMBJ24C 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 SMBJ24C meets industry standards.
7.What is the process for return or replacement of SMBJ24C?
All SMBJ24C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24C, 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 SMBJ24C part is unused and in its original packaging.
Return procedure for SMBJ24C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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