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Taiwan Semiconductor Corporation SMCJ24AH
- Part No.:
- SMCJ24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24AH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,855
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Product details
Overview
SMCJ24AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 24V working stand-off voltage (VWM), 26.7–29.5V breakdown voltage (VBR), and 38.9V maximum clamping voltage (VC) at 40A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and I/O lines.
For engineers reviewing the SMCJ24AH datasheet, SMCJ24AH pinout, SMCJ24AH application, or SMCJ24AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, junction-to-case thermal resistance (10°C/W), moisture sensitivity level (MSL 1), and unidirectional polarity marking on the cathode band.
Technical Context
The SMCJ24AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its minimum breakdown threshold of 26.7V at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1µA at 24V), while fast response time (<1.0ps) enables effective suppression of ESD transients and switching-induced surges.
Thermally, it supports continuous operation up to +150°C junction temperature, with RθJC = 10°C/W enabling efficient heat transfer to PCB copper pads. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability industrial and automotive deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum DC or continuous reverse operating voltage before clamping begins |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Confirmed avalanche onset range for reliable overvoltage triggering |
| VC @ IPPM | 38.9 V @ 40 A - Clamped voltage during 10/1000µs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient, per Fig.5 waveform |
| IR @ VWM | <1 µA - Minimal leakage current at rated stand-off, preserving system standby power |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood or high-ambient environments |
| RθJC | 10 °C/W - Low thermal resistance from junction to case, supporting direct pad conduction cooling |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Surge return path | Connected to ground or low-impedance return plane; carries full surge current during clamping |
| Cathode | Protected line input / High-side connection | Connected to the line being protected (e.g., 24V rail); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including HTOL, TC, UHAST, and ESD-HBM/MM |
| ISO 7637-2 compliance | Guaranteed suppression of Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
| MSL Level 1 | Unlimited floor life at ≤30°C/60% RH - no bake required prior to reflow assembly |
| RoHS & halogen-free | Compliant with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs against load-dump transients (ISO 7637-2 Pulse 5a/b) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp surges above 38.9V within nanoseconds. Use Value: Limits peak voltage seen by downstream regulators and microcontrollers to safe levels without sacrificing steady-state efficiency. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to field-wiring transients and relay coil kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS on each 24V digital input channel, absorbing repetitive 1500W pulses without degradation. Use Value: Eliminates need for external RC snubbers or optocoupler isolation in cost-sensitive discrete I/O designs. |
| Telecom DC Power Interface | Motor Drive Control Board |
Use Scenario: Input-stage surge protection for PoE-powered base stations and remote radio units receiving 24–48V DC via outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on DC input before DC/DC converter, rated for repeated ISO 7637-2 Pulse 2a/3b events. Use Value: Maintains <1µA leakage at 24V, minimizing quiescent loss while delivering sub-1ps response to lightning-induced surges. | Use Scenario: Gate-drive power rail protection in BLDC motor inverters where MOSFET gate drivers are sensitive to voltage spikes from parasitic inductance. IC Role / Device Role / Timing Role: Localized TVS on 12–24V auxiliary supply feeding gate driver ICs, placed adjacent to IC power pins. Use Value: Prevents false triggering or latch-up in isolated gate drivers by clamping transients to ≤38.9V before they reach the IC's internal LDO. |
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 | Same DO-214AC (SMA) package; lower PPK (400W); VBR 26.7–29.7V; VC = 38.9V @ 10.3A | Lower surge rating limits use to non-automotive, low-energy interfaces only | Select when space constraints require smaller SMA footprint and surge energy is ≤400W |
| ON Semiconductor 1.5SMC24AH | Same DO-214AB (SMC) package; identical PPK (1500W); VBR 26.7–29.5V; VC = 38.9V @ 40A; AEC-Q101 qualified | No functional difference; fully interchangeable in layout and electrical behavior | Preferred for dual-sourcing where second-source validation is required without design change |
Compared with SMAJ24A, SMCJ24AH delivers 3.7× higher surge energy handling and automotive qualification; compared with 1.5SMC24AH, it offers identical performance but distinct manufacturer traceability and lot-level reliability reporting.
Availability
SMCJ24AH is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for SMCJ24AH 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 automotive-qualified components.
The SMCJ series was developed specifically for high-energy transient suppression in harsh-environment applications, with emphasis on AEC-Q101 reliability, ISO 7637-2 compliance, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of the SMCJ24AH under maximum rated surge current?
The SMCJ24AH exhibits a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 40 A, measured using the standardized 10/1000 µs double-exponential waveform per Fig.5. This value is guaranteed across the full operating temperature range and ensures predictable overvoltage limiting for downstream circuitry in the SMCJ24AH application.
Is the SMCJ24AH suitable for bidirectional transient suppression?
No - the SMCJ24AH is a unidirectional TVS diode, intended for DC circuits with defined polarity. For bidirectional protection, Taiwan Semiconductor specifies part numbers with "CH" or "CAH" suffixes (e.g., SMCJ24CH). Using the SMCJ24AH in AC or bipolar signal paths would result in forward conduction during negative half-cycles and potential failure.
Does the SMCJ24AH require derating at elevated ambient temperatures?
Yes - the SMCJ24AH's peak pulse power capability must be derated above TA = 25°C per the Pulse Derating Curve (Fig.2). At 85°C ambient, its 1500W rating reduces to approximately 900W; at 125°C, it falls to ~500W. Designers must apply this derating when sizing the SMCJ24AH for under-hood or enclosed industrial environments.
What is the meaning of the "A" in SMCJ24AH, and how does it differ from SMCJ24H?
The "A" in SMCJ24AH denotes tighter VBR tolerance: SMCJ24AH has a breakdown voltage range of 26.7–29.5 V, whereas SMCJ24H spans 26.7–32.6 V. This narrower distribution improves consistency in clamping onset across production lots and simplifies margin analysis in safety-critical SMCJ24AH designs.
Can the SMCJ24AH be used in reflow soldering processes without preconditioning?
Yes - the SMCJ24AH is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking prior to standard lead-free (260°C peak) or tin-lead reflow profiles. Its matte tin-plated leads also ensure robust solder joint formation per J-STD-002.
SMCJ24AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 40A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ24AH FAQ
1.How can I place an order for SMCJ24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24AH 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 SMCJ24AH reliable?
The price and inventory of SMCJ24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24AH is usually 5 days.
3.What payment methods are accepted for SMCJ24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24AH?
SMCJ24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24AH 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 SMCJ24AH?
For technical support, including SMCJ24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24AH requirements.
6.How does Aetrix verify that SMCJ24AH is sourced from the original manufacturer or authorized distributors?
All SMCJ24AH 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 SMCJ24AH meets industry standards.
7.What is the process for return or replacement of SMCJ24AH?
All SMCJ24AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24AH, 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 SMCJ24AH part is unused and in its original packaging.
Return procedure for SMCJ24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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