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Taiwan Semiconductor Corporation SMDJ51AH
- Part No.:
- SMDJ51AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ51AH.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,675
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Product details
Overview
SMDJ51AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 51V working stand-off voltage, 56.7–62.7V breakdown voltage at 1mA, and 82.4V maximum clamping voltage at 36.4A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial ESD/transient protection in DC power rails and signal lines.
For engineers reviewing the SMDJ51AH datasheet, SMDJ51AH pinout, SMDJ51AH application, or SMDJ51AH equivalent, key selection criteria include its DO-214AB (SMC) package, 175°C junction temperature rating, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and unidirectional polarity marking - all critical for robust automotive electronics surge immunity design.
Technical Context
The SMDJ51AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with low clamping ratio (VC/VBR ≈ 1.31). Its thermal design relies on DO-214AB's low RθJL of 15°C/W and RθJA of 75°C/W, enabling sustained 6.5W steady-state dissipation at 25°C ambient.
It meets stringent automotive stress standards including ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection & coupling), and Pulse 3a/3b (switching transients), with validated performance up to 300A non-repetitive forward surge current and ≤5µA reverse leakage at 51V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48V automotive systems. |
| VBR @ IT=1mA | 56.7–62.7 V - Breakdown voltage range confirming reliable avalanche initiation under transient overvoltage conditions. |
| VC @ IPPM | 82.4 V - Clamping voltage at 36.4A peak pulse current; limits protected circuit voltage during 10/1000µs transients. |
| PPK | 3000 W - Peak pulse power rating per 1ms waveform; supports high-energy surge events like load dump. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and matte tin-plated leads. |
Pinout & Package
DO-214AB (SMC) package: cathode-banded unidirectional device with two terminals - anode and cathode - mounted in a molded plastic case rated UL 94V-0. Polarity is marked by a band indicating the cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side (e.g., ground or return path) during clamping; carries full surge current in reverse-biased protection mode. |
| Cathode | Current exit terminal in forward bias; marked end | Connected to protected line (e.g., 48V rail); avalanche conduction occurs when cathode-to-anode voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive-grade deployment across temperature cycling, humidity, and mechanical shock tests. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure. |
| ISO 7637-2 compliance | Guarantees functional immunity against standardized automotive electrical transients without external filtering. |
| Sub-1ps response time | Enables clamping before sensitive downstream ICs experience damaging overvoltage stress. |
| Moisture sensitivity level 1 | Eliminates need for dry-pack handling or baking prior to reflow soldering - compatible with standard SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial DC Input Stage |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs, ADAS modules, and body control units from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges above 51V. Use Value: Limits rail voltage to ≤82.4V during 3000W transients, preventing damage to 65V-rated DC-DC converters and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives powered from 24–48V industrial supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input, coordinated with upstream fuses and common-mode chokes. Use Value: Withstands repetitive ISO 7637-2 Pulse 3b events and maintains <5µA leakage at 51V, ensuring low standby power loss. |
| Telecom DC Feeds | Consumer Equipment Power Inputs |
Use Scenario: Surge protection on -48V telecom rectifier outputs feeding base station radios and remote PHY units. IC Role / Device Role / Timing Role: Reverse-polarity configured TVS on negative rail, using cathode connected to -48V line. Use Value: Clamps negative-going transients to -82.4V while maintaining stable 51V standoff - critical for bipolar supply integrity. | Use Scenario: Input protection for USB-C PD adapters, smart home hubs, and PoE-powered devices. IC Role / Device Role / Timing Role: First-line defense against ESD (IEC 61000-4-2) and lightning-induced surges on AC/DC secondary-side rails. Use Value: Sub-1ps response and 3000W rating absorb 8kV contact ESD pulses without degradation, extending product field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51 | Lower PPK (1500W), same VWM (51V), higher VC (93.6V), DO-214AC (SMA) package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or load dump | Select only for cost-sensitive consumer applications where 3000W headroom is unnecessary. |
| 1.5SMC51A | Same DO-214AB package, identical VWM/VC specs, but not AEC-Q101 qualified and lacks ISO 7637-2 validation | Not approved for automotive use; requires additional system-level testing for functional safety compliance | Acceptable for industrial prototypes but not for production automotive designs requiring AEC-Q101 traceability. |
Compared with SAC51 and 1.5SMC51A, the SMDJ51AH delivers verified 3000W surge capacity, automotive-grade qualification, and guaranteed ISO 7637-2 immunity - making it the sole choice for production-grade 48V automotive power protection where reliability and standards compliance are mandatory.
Availability
SMDJ51AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom infrastructure, and consumer power adapters requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMDJ51AH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMDJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for high-reliability transient suppression in harsh automotive and industrial environments with emphasis on ISO 7637-2 compliance and thermal robustness.
FAQ
What is the maximum clamping voltage of the SMDJ51AH under standard test conditions?
The SMDJ51AH has a maximum clamping voltage (VC) of 82.4 V at 36.4 A peak pulse current (IPPM), measured under the 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value ensures protected circuits remain below critical overvoltage thresholds during high-energy transients such as automotive load dump. The SMDJ51AH maintains this clamping performance across its full operating temperature range.
Is the SMDJ51AH suitable for bidirectional transient protection?
No, the SMDJ51AH is unidirectional and intended for single-polarity DC line protection. For bidirectional applications, the SMDJ51CAH variant must be used - it features symmetrical breakdown in both directions and is marked with "DFZ" code. Using SMDJ51AH in reverse-biased configurations risks permanent failure due to lack of reverse avalanche capability.
Does the SMDJ51AH require derating at elevated ambient temperatures?
Yes, the SMDJ51AH must be derated above 25°C ambient per its pulse derating curve (Fig.2). At 85°C ambient, its 3000W peak pulse power rating drops to approximately 1800W, and its steady-state power dissipation falls from 6.5W to ~3.2W. Thermal design must account for RθJA = 75°C/W and board copper area to maintain TJ ≤ 175°C during repeated surge events.
What is the moisture sensitivity level (MSL) of the SMDJ51AH and how does it affect PCB assembly?
The SMDJ51AH is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and exposed to ambient conditions without baking prior to reflow soldering. This eliminates moisture-related popcorning risk and simplifies SMT line integration - no dry pack or floor life tracking is required for the SMDJ51AH.
How does the SMDJ51AH compare to standard SMA-package TVS diodes in terms of surge capability?
The SMDJ51AH's DO-214AB (SMC) package provides ~2.5× higher thermal mass and superior heat spreading versus DO-214AC (SMA), enabling its 3000W peak pulse rating - compared to typical 1500W for SMA devices like SAC51. This allows the SMDJ51AH to handle automotive load dump events that would fail smaller packages, making it essential for 48V system protection where energy levels exceed 100J.
SMDJ51AH 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 36.4A
- 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)
SMDJ51AH FAQ
1.How can I place an order for SMDJ51AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ51AH 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 SMDJ51AH reliable?
The price and inventory of SMDJ51AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ51AH is usually 5 days.
3.What payment methods are accepted for SMDJ51AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ51AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ51AH?
SMDJ51AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ51AH 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 SMDJ51AH?
For technical support, including SMDJ51AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ51AH requirements.
6.How does Aetrix verify that SMDJ51AH is sourced from the original manufacturer or authorized distributors?
All SMDJ51AH 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 SMDJ51AH meets industry standards.
7.What is the process for return or replacement of SMDJ51AH?
All SMDJ51AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ51AH, 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 SMDJ51AH part is unused and in its original packaging.
Return procedure for SMDJ51AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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