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Taiwan Semiconductor Corporation SMBJ24AH
- Part No.:
- SMBJ24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24AH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,425
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Product details
Overview
SMBJ24AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 24V working stand-off voltage (VWM), and 38.9V maximum clamping voltage (VC) at 16.0A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ24AH datasheet, SMBJ24AH pinout, SMBJ24AH application, or SMBJ24AH equivalent, this device is selected for robust ESD and inductive switching surge protection where low leakage (<1 µA at 24V), fast response (<1.0 ps), AEC-Q101 qualification, and RoHS/halogen-free compliance are required.
Technical Context
The SMBJ24AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling precise breakdown at 26.7–29.5V (VBR @ IT = 1 mA) and clamping transients within nanoseconds. Its thermal resistance (RθJA = 55°C/W) supports operation up to +150°C junction temperature under sustained surge conditions.
It meets ISO 7637-2 immunity requirements for automotive electronics and complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for reflow-soldered high-reliability PCB assemblies without preconditioning.
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 / 29.5 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on before system damage |
| VC @ IPP | 38.9 V @ 16.0 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge events |
| PPK | 600 W - Peak pulse power rating defines transient energy absorption capability |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ max | +150 °C - Enables use in under-hood automotive environments and industrial enclosures |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated placement and IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; two-terminal unidirectional configuration. Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; conducts surge current to GND when cathode exceeds VBR |
| Cathode | Protected line input | Connected to supply rail (e.g., 24V battery line); clamps overvoltage by shunting current to anode when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in harsh environments |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream logic or analog circuitry sustains damage |
| ISO 7637-2 compliant | Withstands standardized automotive load-dump and inductive-switching pulses without degradation |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-fed ECUs exposed to load dump and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before regulation stage. Use Value: Limits clamped voltage to 38.9V, protecting 40V-rated input MOSFETs and gate drivers from overvoltage failure. | Use Scenario: Digital input modules receiving 24V DC signals from field sensors in factory automation systems. IC Role / Device Role / Timing Role: Front-end transient suppressor on each channel to absorb EFT bursts and inductive kickback from solenoid wiring. Use Value: Sub-1µA leakage avoids false triggering of optocoupler inputs; 600W rating handles repetitive 10/1000µs transients per IEC 61000-4-4. |
| LED Driver Overvoltage Clamp | Medical Equipment Power Entry |
Use Scenario: Constant-current LED drivers powered from 24V industrial supplies subject to switching noise and cable-borne transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input capacitor to limit voltage excursions during hot-plug or short-circuit recovery. Use Value: 38.9V clamping prevents overvoltage stress on buck controller ICs rated for 42V absolute maximum input. | Use Scenario: External AC/DC adapter input stage in portable diagnostic devices requiring low-risk surge suppression. IC Role / Device Role / Timing Role: Primary-level TVS on DC input connector to meet IEC 60601-1 creepage/clearance and surge immunity requirements. Use Value: AEC-Q101 qualification and halogen-free construction support regulatory documentation for Class II medical approvals. |
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 | Same VWM (24V), but higher VC = 43.0V @ 14.6A; lower IPP rating; non-AEC-Q101 | Not qualified for automotive use; suitable only for commercial/industrial grade designs | Select SMBJ24A only if AEC-Q101 is not required and higher clamping voltage is acceptable |
| SAC24 | Same DO-214AA package; VWM = 24V; VC = 38.5V @ 16.5A; AEC-Q101 qualified; slightly tighter VBR tolerance | Identical application scope but manufactured by STMicroelectronics; different marking and traceability chain | Choose SAC24 when dual-sourcing or second-source validation is mandated by OEM procurement policy |
Compared with SMBJ24A, SMBJ24AH offers lower clamping voltage and automotive qualification; versus SAC24, it provides identical protection performance with Taiwan Semiconductor's supply chain and packaging consistency - critical for long-lifecycle industrial programs.
Availability
SMBJ24AH is available at Aetrix Electronics and suitable for automotive control units, industrial PLC I/O modules, LED lighting drivers, and medical power entry circuits requiring stable component supply across multi-year production cycles.
Supply support for SMBJ24AH 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 Science Park, Taiwan.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing low clamping voltage, tight VBR distribution, and high surge robustness in standard SMB packages.
FAQ
What is the breakdown voltage range for SMBJ24AH?
The SMBJ24AH has a minimum breakdown voltage (VBR) of 26.7 V and a maximum of 29.5 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across production lots and temperature extremes, directly supporting reliable clamping in 24V automotive and industrial systems where SMBJ24AH is deployed.
Is SMBJ24AH suitable for bidirectional transient protection?
No - SMBJ24AH is a unidirectional TVS diode, intended for DC rail protection with defined polarity. For bidirectional applications (e.g., AC lines or data bus protection), Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMBJ24CH). Using SMBJ24AH in reverse-biased configurations risks permanent damage due to lack of symmetrical avalanche structure.
Does SMBJ24AH require derating at elevated ambient temperatures?
Yes - SMBJ24AH must be derated above TA = 25°C per Figure 2 in the datasheet. At 85°C ambient, its 600W peak pulse power rating drops to approximately 420W, and its 16.0A IPP rating reduces proportionally. Thermal design must account for RθJA = 55°C/W and ensure PCB copper area supports heat dissipation when SMBJ24AH absorbs repeated transients.
What is the maximum leakage current of SMBJ24AH at its working voltage?
The SMBJ24AH exhibits ≤1 µA maximum blocking leakage current (ID) at its 24V working stand-off voltage (VWM), measured at 25°C. This ultra-low leakage preserves standby power budgets in battery-powered systems and avoids false triggering in high-impedance sensing circuits - a key design advantage confirmed in the electrical specifications table for SMBJ24AH.
How does SMBJ24AH differ from SMBJ24H?
SMBJ24AH features tighter breakdown voltage tolerance (26.7–29.5 V vs. 26.7–32.6 V for SMBJ24H), lower clamping voltage (38.9 V vs. 43.0 V), and higher peak impulse current rating (16.0 A vs. 14.6 A). These improvements make SMBJ24AH preferable for designs demanding stricter voltage control and enhanced surge margin - both share DO-214AA packaging and AEC-Q101 qualification.
SMBJ24AH 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 16A
- 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)
SMBJ24AH FAQ
1.How can I place an order for SMBJ24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24AH 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 SMBJ24AH reliable?
The price and inventory of SMBJ24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24AH is usually 5 days.
3.What payment methods are accepted for SMBJ24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24AH?
SMBJ24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24AH 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 SMBJ24AH?
For technical support, including SMBJ24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24AH requirements.
6.How does Aetrix verify that SMBJ24AH is sourced from the original manufacturer or authorized distributors?
All SMBJ24AH 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 SMBJ24AH meets industry standards.
7.What is the process for return or replacement of SMBJ24AH?
All SMBJ24AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24AH, 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 SMBJ24AH part is unused and in its original packaging.
Return procedure for SMBJ24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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