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Taiwan Semiconductor Corporation SMBJ24A
- Part No.:
- SMBJ24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:29,923
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Product details
Overview
SMBJ24A 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), 26.7–29.5 V breakdown voltage (VBR), 38.9 V maximum clamping voltage (VC) at 16.0 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive lighting control modules to safeguard microcontrollers against load-dump transients.
For engineers reviewing the SMBJ24A datasheet, SMBJ24A pinout, SMBJ24A application, or SMBJ24A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current at operating voltage, thermal derating above 25°C ambient, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMBJ24A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (26.7–29.5 V @ 1 mA). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA @ 24 V), while the DO-214AA (SMB) package provides robust thermal performance (RθJA = 55°C/W) and compatibility with automated SMT assembly.
It meets ISO 7637-2 immunity requirements for automotive electrical systems, with a 10/1000 µs surge waveform capability and junction temperature range of –55°C to +150°C. The device is halogen-free and RoHS-compliant, rated per JESD201 Class 2 for tin whisker resistance and J-STD-020 Level 1 for moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's normal DC rail. |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on without premature conduction during nominal operation. |
| VC @ IPP | 38.9 V @ 16.0 A - Clamped voltage during 10/1000 µs surge; must stay below downstream IC's absolute max rating (e.g., 40 V MCU I/O). |
| PPK | 600 W - Peak non-repetitive surge power handling; defines single-event energy absorption capacity (e.g., 600 W × 1 ms = 0.6 J). |
| ID @ VWM | <1 µA - Reverse leakage at 24 V; negligible power loss and no measurable impact on low-power sensor bias networks. |
| TJ max | +150°C - Maximum junction temperature; enables use in under-hood automotive environments with minimal heatsinking. |
| RθJA | 55°C/W - Thermal resistance from junction to ambient; supports ~10.9 W steady-state dissipation at 25°C ambient before reaching TJ max. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.090 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; defines polarity for unidirectional clamping action. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V supply rail); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping voltage accuracy | VC = 38.9 V @ 16.0 A - Tight 12% margin below common 44 V automotive rail limits, enabling direct protection of 3.3 V/5 V logic interfaces via series impedance. |
| Response time | <1.0 ps - Sub-picosecond junction response ensures suppression before transient energy couples into sensitive analog or digital inputs. |
| Leakage performance | <1 µA @ 24 V - Enables use in always-on battery-backed circuits (e.g., CAN wake-up receivers) without measurable drain. |
| Automated placement support | DO-214AA (SMB) footprint - Standardized land pattern compatible with high-speed pick-and-place machines and reflow profiles per J-STD-020 Level 1. |
| Automotive qualification | ISO 7637-2 Pulse 1/2a/2b/3a/3b compliant - Validated for real-world vehicle electrical disturbances including load dump, jump start, and inductive switching noise. |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET gate drivers in headlamp modules subjected to load-dump surges up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping transients before they reach driver IC power pins. Use Value: Limits clamped voltage to 38.9 V, staying within 40 V absolute maximum rating of common automotive gate drivers (e.g., TI UCC27531), preventing latch-up or oxide damage. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: TVS connected across input terminals to shunt fast transients (>1 kV/µs) before they propagate through optocoupler input stages. Use Value: Sub-1 ps response ensures clamping initiates prior to optocoupler CMTI limit (~10 kV/µs), preserving signal integrity and preventing false triggering. |
| DC Power Rail Protection | USB-C Port ESD Protection |
Use Scenario: Guarding 24 V auxiliary power rails in infotainment head units against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional TVS installed at main power entry point, absorbing >600 W surge energy without failure. Use Value: 600 W PPK rating handles 300 V/10 ms load-dump pulses per ISO 16750-2, eliminating need for additional series fusing or active crowbar circuits. |
Use Scenario: Secondary-level ESD protection on USB-C VBUS lines in portable medical devices requiring IEC 61000-4-2 Level 4 compliance. IC Role / Device Role / Timing Role: TVS placed downstream of primary fuse and upstream of buck converter, clamping contact ESD events to safe levels. Use Value: 38.9 V clamping voltage ensures VBUS stays below 42 V input limit of common USB-C PD controllers (e.g., STUSB4500), avoiding brownout or shutdown. |
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 SMAJ24A | VBR = 26.7–29.7 V, VC = 38.9 V @ 16.0 A, same DO-214AA package, RθJA = 55°C/W | Identical clamping performance and thermal specs; differs only in marking code and minor leakage tolerance (≤1 µA vs ≤5 µA) | Drop-in replacement where Littelfuse sourcing is preferred; validated for identical ISO 7637-2 test conditions. |
| ON Semiconductor SMCJ24A | VBR = 26.7–29.5 V, VC = 38.9 V @ 16.0 A, but in larger DO-214AB (SMC) package (RθJA = 35°C/W) | Higher steady-state power handling (5 W vs 3 W), but requires larger PCB area and different pad layout | Select when higher continuous power dissipation or improved thermal margin is required; not pin-compatible due to package size difference. |
Compared with SMBJ24A, SMAJ24A offers identical electrical performance and mechanical fit, while SMCJ24A trades smaller footprint for superior thermal performance - making SMBJ24A optimal for space-constrained automotive modules where 3 W steady-state dissipation suffices.
Availability
SMBJ24A is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power rail protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ24A 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, with global distribution and AEC-Q200 qualified product lines.
The SMBJ series was developed specifically for automotive and industrial surge protection, emphasizing low clamping voltage, fast response, and robust packaging to meet ISO 7637-2 and AEC-Q200 stress requirements.
FAQ
What is the maximum clamping voltage of SMBJ24A under standard 10/1000 µs surge conditions?
The SMBJ24A has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 16.0 A. This value is measured per ANSI/IEEE C62.35 and confirmed in Taiwan Semiconductor's R2104 datasheet, ensuring predictable voltage limiting during real-world transients like load dump or inductive switching.
Is SMBJ24A suitable for bidirectional transient protection?
No, SMBJ24A is a unidirectional TVS diode and is not rated for bidirectional operation. For bipolar applications, Taiwan Semiconductor specifies the SMBJ24CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMBJ24A in reverse-biased AC or floating-signal paths may result in permanent junction damage.
What is the leakage current specification for SMBJ24A at its working stand-off voltage?
The SMBJ24A exhibits a maximum blocking leakage current (ID) of 1 µA at its 24 V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage ensures minimal power loss in always-on systems such as automotive body control modules or battery-monitoring circuits where standby current budgets are tight.
Does SMBJ24A comply with automotive electromagnetic compatibility standards?
Yes, SMBJ24A is explicitly rated to meet ISO 7637-2 for electrical disturbances from conduction and coupling, covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (sudden load interruption), and Pulse 3a/3b (capacitive coupled transients). This compliance is documented in the "FEATURES" section of the R2104 datasheet and verified per standard test waveforms.
What is the thermal resistance from junction to ambient for SMBJ24A in standard mounting conditions?
The SMBJ24A has a junction-to-ambient thermal resistance (RθJA) of 55°C/W when mounted on a standard FR-4 PCB with minimum recommended copper pad area, as specified in Taiwan Semiconductor's R2104 datasheet. This value supports up to ~10.9 W of steady-state power dissipation before reaching its 150°C maximum junction temperature at 25°C ambient.
SMBJ24A 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:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ24A FAQ
1.How can I place an order for SMBJ24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24A 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 SMBJ24A reliable?
The price and inventory of SMBJ24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24A is usually 5 days.
3.What payment methods are accepted for SMBJ24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24A?
SMBJ24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24A 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 SMBJ24A?
For technical support, including SMBJ24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24A requirements.
6.How does Aetrix verify that SMBJ24A is sourced from the original manufacturer or authorized distributors?
All SMBJ24A 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 SMBJ24A meets industry standards.
7.What is the process for return or replacement of SMBJ24A?
All SMBJ24A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24A, 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 SMBJ24A part is unused and in its original packaging.
Return procedure for SMBJ24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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