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Taiwan Semiconductor Corporation SMDJ24AH
- Part No.:
- SMDJ24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ24AH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,676
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Product details
Overview
SMDJ24AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 24 V, breakdown voltage range 26.7–29.5 V at 1 mA, and clamping voltage of 38.9 V at 77.1 A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial ESD/EMI protection in power rails and I/O lines.
For engineers reviewing the SMDJ24AH datasheet, SMDJ24AH pinout, SMDJ24AH application, or SMDJ24AH equivalent, key selection criteria include its DO-214AB (SMC) package, 175 °C max junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1 ps response time, and unidirectional polarity marking.
Technical Context
The SMDJ24AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 26.7–29.5 V breakdown threshold. It clamps transients to ≤38.9 V at 77.1 A (10/1000 µs waveform), dissipating up to 3000 W peak power for non-repetitive pulses.
Its glass-passivated junction ensures stable leakage (<1 µA at 24 V), while thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead) supports reliable operation under sustained surge conditions in automotive ECUs and industrial PLCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 26.7–29.5 V - Guaranteed avalanche breakdown range; defines minimum trigger threshold |
| VC @ IPPM=77.1 A | 38.9 V - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level |
| PPK | 3000 W - Peak pulse power handling per single non-repetitive event (per Fig.5) |
| TJ max | 175 °C - Maximum allowable junction temperature; enables high-temperature under-hood use |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and matte tin leads |
| Response time | <1.0 ps - Sub-picosecond turn-on ensures protection before sensitive ICs experience overvoltage |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking for unidirectional polarity; terminals are matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to system ground or low-side reference; carries full surge current during clamping |
| Cathode | Reverse voltage input / Clamping node | Connected to protected line (e.g., 24 V rail); voltage referenced to anode during transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per stress test requirements |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) across lifetime and temperature extremes |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; compatible with standard SMT assembly processes |
| UL 94V-0 molding compound | Self-extinguishing encapsulation material prevents flame propagation in safety-critical enclosures |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V DC Power Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump and jump-start surges in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground to clamp negative transients and limit positive spikes to safe levels. Use Value: Maintains signal integrity below 38.9 V clamping voltage while surviving 3000 W pulses per ISO 7637-2 Pulse 2b and 5a. | Use Scenario: Safeguarding programmable logic controller (PLC) 24 V supply inputs against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input rail, positioned upstream of DC-DC converters and LDOs. Use Value: Limits rail collapse and downstream component stress via 77.1 A peak current handling and 175 °C junction rating for harsh ambient environments. |
| Telecom Remote Radio Unit (RRU) Power Interface | Medical Infusion Pump Motor Driver |
Use Scenario: Shielding Ethernet PHY power pins and RS-485 transceivers from lightning-induced surges in outdoor base station equipment. IC Role / Device Role / Timing Role: Secondary-level TVS on 24 V bias rails feeding RF amplifiers and digital control circuits. Use Value: Provides <1 ps response and 38.9 V clamping to prevent latch-up or gate oxide damage in sensitive analog front-ends. | Use Scenario: Protecting H-bridge MOSFET gate drivers and current-sense amplifiers from motor commutation spikes in battery-powered infusion systems. IC Role / Device Role / Timing Role: Unidirectional clamp on 24 V motor supply rail, coordinated with ceramic X2Y capacitors for broadband filtering. Use Value: Enables compliance with IEC 60601-1 edition 3.1 EMC requirements using a single-device solution rated for medical-grade thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower peak power (400 W), smaller DO-214AC (SMA) package, higher RθJA (110 °C/W) | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy transients | Select only for cost-sensitive consumer applications where 3000 W capability is unnecessary |
| TPSMD24 | Same 3000 W rating and DO-214AB package; tighter VBR tolerance (5%), but no AEC-Q101 qualification | Lacks automotive qualification; requires additional validation for automotive Tier 1 designs | Prefer for industrial automation where AEC-Q101 is not mandated but same electrical performance is required |
Compared with SMDJ24AH, SMAJ24A offers reduced surge robustness and thermal margin, while TPSMD24 matches power and package but omits automotive qualification-making SMDJ24AH the sole choice for production automotive modules requiring AEC-Q101 and ISO 7637-2 compliance.
Availability
SMDJ24AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power supplies, telecom remote radio units, and medical infusion pump motor drivers requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ24AH 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMDJ series was developed specifically for high-energy transient suppression in automotive 12 V/24 V systems and industrial DC power interfaces, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability.
FAQ
What is the maximum clamping voltage of the SMDJ24AH under standard test conditions?
The SMDJ24AH has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 77.1 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The SMDJ24AH maintains this clamping performance across its specified operating temperature range, making it suitable for demanding automotive and industrial applications where voltage overshoot must be tightly controlled.
Is the SMDJ24AH suitable for bidirectional transient protection?
No, the SMDJ24AH is a unidirectional TVS diode intended for single-polarity surge suppression. For bidirectional protection, the SMDJ24CAH variant must be used-it features symmetrical breakdown in both directions and identical clamping characteristics. The SMDJ24AH includes a cathode band marking and is electrically asymmetric; using it in reverse-biased configurations without proper polarity alignment will result in unintended conduction or failure to clamp correctly.
Does the SMDJ24AH meet automotive qualification standards?
Yes, the SMDJ24AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its construction-including glass-passivated junction, moisture sensitivity level 1, and UL 94V-0 molding compound-supports full automotive grade reliability. These qualifications are verified per Taiwan Semiconductor's official documentation (Version B2104), confirming suitability for use in engine control units, body control modules, and other automotive electronic systems.
What is the thermal resistance specification for the SMDJ24AH?
The SMDJ24AH has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and a junction-to-lead thermal resistance (RθJL) of 15 °C/W, both measured under standard JEDEC conditions. These values reflect its DO-214AB (SMC) package efficiency in dissipating heat during transient events and steady-state leakage. Proper PCB copper area and thermal vias are recommended to approach the RθJL value in real-world layouts, ensuring safe operation up to the 175 °C maximum junction temperature.
How does the SMDJ24AH compare to the SMAJ24A in terms of surge handling capability?
The SMDJ24AH delivers 3000 W peak pulse power, whereas the SMAJ24A is rated for only 400 W-less than 14% of the SMDJ24AH's capacity. This difference stems from larger die size, lower thermal resistance (75 vs. 110 °C/W), and optimized packaging in the SMDJ24AH. As a result, the SMDJ24AH withstands ISO 7637-2 Pulse 5a (load dump) events that would destroy the SMAJ24A, making it the appropriate choice for automotive and heavy-industrial applications demanding high-energy transient immunity.
SMDJ24AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 77.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ24AH FAQ
1.How can I place an order for SMDJ24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ24AH 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 SMDJ24AH reliable?
The price and inventory of SMDJ24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ24AH is usually 5 days.
3.What payment methods are accepted for SMDJ24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ24AH?
SMDJ24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ24AH 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 SMDJ24AH?
For technical support, including SMDJ24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ24AH requirements.
6.How does Aetrix verify that SMDJ24AH is sourced from the original manufacturer or authorized distributors?
All SMDJ24AH 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 SMDJ24AH meets industry standards.
7.What is the process for return or replacement of SMDJ24AH?
All SMDJ24AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ24AH, 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 SMDJ24AH part is unused and in its original packaging.
Return procedure for SMDJ24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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