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Taiwan Semiconductor Corporation SMBJ24CH
- Part No.:
- SMBJ24CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CH.pdf
- Description:
- 600W, 29.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,025
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Product details
Overview
SMBJ24CH 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 24 V working stand-off voltage (VWM), 26.7–32.6 V breakdown voltage (VBR), 43.0 V maximum clamping voltage (VC) at 14.6 A peak pulse current (IPP), and 600 W peak pulse power (PPK) with sub-1 ps response time.
For engineers reviewing the SMBJ24CH datasheet, SMBJ24CH pinout, SMBJ24CH application, or SMBJ24CH equivalent, key selection criteria include unidirectional vs. bidirectional configuration (CH suffix = bidirectional), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1 µA at 24 V, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMBJ24CH operates as a silicon avalanche diode with glass-passivated junction, enabling fast transient suppression without degradation under repeated surges. Its bidirectional structure supports symmetrical clamping in AC-coupled or floating signal/power lines, and it meets ISO 7637-2 test requirements for automotive load-dump and inductive-switching transients.
Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W, allowing sustained operation up to TJ = 150 °C. The device exhibits <3.5 V forward voltage only in unidirectional variants - not applicable to SMBJ24CH - and maintains <1 µA blocking leakage at rated VWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 26.7 V / 32.6 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPP | 43.0 V at 14.6 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum overvoltage stress |
| PPK | 600 W - Peak non-repetitive surge power handling per single 10/1000 µs pulse |
| ID @ VWM | ≤1 µA - Leakage current at 24 V; ensures minimal standby power loss and signal integrity in high-impedance nodes |
| Response time | <1.0 ps - Enables effective suppression of ESD events (IEC 61000-4-2) and fast electrical fast transients (EFT) |
| Package | DO-214AA (SMB) - Surface-mount outline with 0.090 g mass, UL 94V-0 molding, and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; bidirectional symmetry means both terminals are functionally identical - no anode/cathode polarity distinction. Terminals are lead-free, matte tin-plated, and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional surge port | Either terminal accepts transient energy from either polarity; no directional bias required in layout |
| Terminal 2 | Bidirectional surge port | Electrically identical to Terminal 1; symmetric clamping enables use in AC, differential, or floating bus lines |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and powertrain applications per stress test requirements |
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; resists humidity-induced degradation |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) waveforms |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before reflow; compatible with standard SMT assembly |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmental compliance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load-dump pulses up to 35 V and inductive switching spikes. IC Role / Device Role: Bidirectional TVS placed across power input to clamp transients before they reach LDOs, MCUs, or CAN transceivers. Use Value: Limits voltage to ≤43.0 V during 14.6 A surges, preventing latch-up or gate oxide damage in downstream ICs. |
Use Scenario: 4–20 mA current-loop sensors connected to PLC analog inputs in factory automation. IC Role / Device Role: SMBJ24CH guards the sensor input node against ESD and cable discharge events on field wiring. Use Value: Sub-1 ps response and ≤1 µA leakage preserve signal accuracy while surviving ±8 kV contact ESD per IEC 61000-4-2. |
| LED Driver Overvoltage Clamp | RS-485 Bus Transient Suppression |
|
Use Scenario: Constant-current LED drivers in automotive lighting subjected to ISO 7637-2 Pulse 2b (battery disconnect). IC Role / Device Role: Placed across driver output to absorb reverse EMF from inductive LED strings during switch-off. Use Value: 600 W PPK rating handles repetitive 10/1000 µs surges without parametric shift or thermal runaway. |
Use Scenario: RS-485 transceivers in building control systems with long unshielded data runs. IC Role / Device Role: Bidirectional clamping between A/B lines and ground to suppress common-mode surges and EFT bursts. Use Value: Symmetric VBR (26.7–32.6 V) and VC (43.0 V) ensure balanced protection without distorting differential signaling. |
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 SMAJ24CA | Same DO-214AC (SMA) package; slightly higher VC = 38.9 V at 15.4 A; lower PPK = 400 W | Lower clamping voltage but reduced surge margin; less suitable for ISO 7637-2 Pulse 1 where high IPP is critical | Prefer SMBJ24CH when 600 W PPK and AEC-Q101 validation are mandatory |
| ON Semiconductor 1.5SMC24CA | DO-214AB (SMC) package; larger footprint; VC = 38.9 V at 15.4 A; PPK = 1500 W | Higher power handling but incompatible PCB layout; requires redesign for space and thermal relief | Choose SMBJ24CH for space-constrained SMB footprints requiring automotive qualification |
Compared with SMAJ24CA and 1.5SMC24CA, the SMBJ24CH delivers optimal balance of AEC-Q101 compliance, 600 W surge capacity, and DO-214AA footprint - making it the preferred choice for automotive body electronics and industrial modules where board area and qualification are jointly constrained.
Availability
SMBJ24CH is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC analog input protection, and LED lighting surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ24CH 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 certification capability.
The SMBJH series was developed specifically for automotive and industrial transient protection, emphasizing robustness under ISO 7637-2 pulses, low leakage, and surface-mount manufacturability in DO-214AA packaging.
FAQ
What does the 'CH' suffix indicate in SMBJ24CH?
The 'CH' suffix denotes a bidirectional configuration - meaning SMBJ24CH provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional 'H' variants, SMBJ24CH has no cathode band and functions identically across both terminals, making it ideal for AC lines, differential buses, or floating grounds where polarity reversal may occur.
Is SMBJ24CH qualified for automotive applications?
Yes, SMBJ24CH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its glass-passivated junction, moisture sensitivity level 1, and 150 °C maximum junction temperature support deployment in engine control units, body controllers, and ADAS power domains where reliability under thermal and electrical stress is critical.
What is the maximum clamping voltage of SMBJ24CH and under what conditions?
The maximum clamping voltage of SMBJ24CH is 43.0 V, measured at a peak pulse current (IPP) of 14.6 A using the standardized 10/1000 µs double-exponential waveform. This value represents the worst-case voltage seen by downstream circuitry during a full-rated surge event and is guaranteed across the operating temperature range.
How does SMBJ24CH compare to unidirectional SMBJ24H in terms of electrical behavior?
SMBJ24CH and SMBJ24H share identical VWM (24 V), VBR (26.7–32.6 V), and PPK (600 W), but differ fundamentally in conduction symmetry: SMBJ24CH clamps equally for ± polarity transients, while SMBJ24H conducts only in reverse bias and requires correct cathode orientation. SMBJ24CH eliminates polarity-checking during placement and supports AC-coupled protection schemes.
Can SMBJ24CH be used in place of SMBJ24AH?
No - SMBJ24AH is a unidirectional variant with tighter VBR tolerance (26.7–29.5 V vs. 26.7–32.6 V for SMBJ24CH) and lower clamping voltage (38.9 V vs. 43.0 V), but it cannot replace SMBJ24CH in bidirectional applications. Substituting SMBJ24AH would result in open-circuit failure during positive transients due to its inherent polarity dependence.
SMBJ24CH 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ24CH FAQ
1.How can I place an order for SMBJ24CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CH 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 SMBJ24CH reliable?
The price and inventory of SMBJ24CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24CH is usually 5 days.
3.What payment methods are accepted for SMBJ24CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CH?
SMBJ24CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CH 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 SMBJ24CH?
For technical support, including SMBJ24CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CH requirements.
6.How does Aetrix verify that SMBJ24CH is sourced from the original manufacturer or authorized distributors?
All SMBJ24CH 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 SMBJ24CH meets industry standards.
7.What is the process for return or replacement of SMBJ24CH?
All SMBJ24CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CH, 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 SMBJ24CH part is unused and in its original packaging.
Return procedure for SMBJ24CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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