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Taiwan Semiconductor Corporation SMDJ51CAH
- Part No.:
- SMDJ51CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ51CAH.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,382
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Product details
Overview
SMDJ51CAH from Taiwan Semiconductor is a bidirectional 51V transient voltage suppressor diode (TVS) in DO-214AB (SMC) package, rated for 3000W peak pulse power, 82.4V maximum clamping voltage at 36.4A peak current, and AEC-Q101 qualified for automotive-grade reliability. It protects sensitive electronics against ESD, load-switching transients, and lightning-induced surges in DC power rails and signal lines.
For engineers reviewing the SMDJ51CAH datasheet, SMDJ51CAH pinout, SMDJ51CAH application, or SMDJ51CAH equivalent, key selection criteria include bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 1.0ps response time, TJ = –55°C to +175°C operating range, and DO-214AB mechanical compatibility with automated SMT assembly.
Technical Context
The SMDJ51CAH employs a glass-passivated silicon junction optimized for low dynamic impedance and stable bidirectional clamping. Its breakdown voltage is specified at 56.7–62.7V (min/max) with 1mA test current, ensuring precise overvoltage threshold activation across temperature and production lot.
Designed for unidirectional and bidirectional configurations, the SMDJ51CAH delivers symmetrical reverse/forward clamping behavior per its CAH suffix designation. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, supporting high-reliability reflow profiles without popcorn risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR @ IT=1mA | 56.7–62.7 V - Verified breakdown threshold ensures consistent surge turn-on across units |
| VC @ IPPM=36.4A | 82.4 V - Clamping voltage limits downstream device stress during 10/1000µs transients |
| PPK | 3000 W - Peak pulse power rating supports high-energy automotive load-dump immunity |
| TJ Range | –55°C to +175°C - Enables operation in under-hood and industrial environments |
| Response Time | <1.0 ps - Sub-picosecond junction response prevents voltage overshoot before clamping |
| Package | DO-214AB (SMC) - Standardized surface-mount outline compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional function renders polarity non-directional in circuit use).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals serve identical clamping roles; no fixed anode/cathode assignment required in layout |
| Case (exposed metal pad) | Thermal conduction path | Provides low RθJL = 15°C/W to PCB copper for sustained power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| ISO 7637-2 compliance | Guarantees immunity to standardized vehicle electrical transients (Pulse 1, 2a, 2b, 3a, 3b) |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling |
| Level 1 moisture sensitivity | Enables direct placement without baking or dry-pack handling prior to reflow |
| Halogen-free construction | Meets IEC 61249-2-21 for environmentally compliant manufacturing and end-of-life processing |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 48V battery-supplied ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input rail to shunt energy into ground during overvoltage events. Use Value: Limits rail voltage to ≤82.4V during 3000W pulses, preventing damage to downstream DC-DC converters and microcontrollers in SMDJ51CAH-equipped designs. | Use Scenario: Safeguarding analog input channels of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on 0–10V or 4–20mA signal paths before precision ADC front-ends. Use Value: Maintains signal integrity by clamping fast transients below 1.0ps, avoiding latch-up or offset shift in SMDJ51CAH-protected measurement circuits. |
| Telecom Base Station DC Feeds | Consumer USB-C Power Delivery Lines |
Use Scenario: Shielding remote radio unit (RRU) power inputs from lightning-induced surges on outdoor cable runs. IC Role / Device Role / Timing Role: Primary overvoltage protection element on -48V DC feed lines entering RF equipment enclosures. Use Value: Withstands repetitive 3000W pulses per IEC 61000-4-5 while maintaining VWM = 51V hold-off for normal operation in SMDJ51CAH-deployed telecom infrastructure. | Use Scenario: Adding robust surge immunity to USB-C PD 5V/9V/15V/20V power switches and port controllers. IC Role / Device Role / Timing Role: Secondary-level TVS on VBUS line after primary fuse and upstream filtering, targeting ESD and hot-swap transients. Use Value: Provides 82.4V clamping headroom above 20V PD profiles, enabling safe operation of SMDJ51CAH in multi-voltage USB-C systems without false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA | Lower PPK = 1500W; VC = 85.0V @ 17.6A; same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1 (load dump); limited to lower-energy ESD and signal-line transients | Select when cost sensitivity outweighs automotive-grade energy handling; verify clamping margin against system surge profile |
| SMCJ51CA | Identical electrical specs and DO-214AB package; manufactured by Vishay, not AEC-Q101 qualified | Lacks automotive qualification; acceptable for industrial/commercial use where AEC-Q101 is not mandated | Choose for non-automotive programs requiring second-source availability without design change |
Compared with SAC51CA and SMCJ51CA, the SMDJ51CAH uniquely combines 3000W peak power, AEC-Q101 qualification, and ISO 7637-2 compliance-making it the only option among the three validated for under-hood automotive deployment where sustained surge energy and qualification traceability are mandatory.
Availability
SMDJ51CAH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom base station power feeds, and consumer USB-C power delivery systems requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMDJ51CAH 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 for automotive, industrial, and computing markets.
The SMDJ series was developed specifically to meet stringent automotive transient immunity standards-including AEC-Q101 and ISO 7637-2-while delivering high-power clamping in compact surface-mount packages for next-generation ECU and ADAS platforms.
FAQ
What is the breakdown voltage tolerance for SMDJ51CAH?
The SMDJ51CAH has a minimum breakdown voltage of 56.7V and maximum of 62.7V at 1mA test current, yielding a ±5.5% tolerance band around the nominal 51V working voltage. This tight VBR distribution ensures predictable clamping onset across production lots and temperature ranges in SMDJ51CAH-based protection circuits.
Is SMDJ51CAH suitable for bidirectional signal line protection?
Yes, the CAH suffix explicitly denotes bidirectional functionality. The SMDJ51CAH provides symmetrical clamping in both polarities, making it appropriate for AC-coupled data lines, differential buses like RS-485, and any application requiring equal surge suppression regardless of voltage polarity-without requiring external polarity configuration in the SMDJ51CAH circuit layout.
Does SMDJ51CAH require derating at elevated ambient temperatures?
Yes, SMDJ51CAH must be derated above 25°C ambient per Figure 2 in the datasheet. At 100°C, its peak pulse power drops to approximately 1800W (60% of 3000W), and at 150°C, it falls to ~900W. Thermal design must account for this derating, especially in enclosed automotive or industrial enclosures where SMDJ51CAH operates near its 175°C max junction limit.
Can SMDJ51CAH replace SMDJ51AH in an existing design?
No-SMDJ51AH is unidirectional, while SMDJ51CAH is bidirectional. Swapping them requires verifying circuit polarity constraints: SMDJ51AH uses a defined cathode band for directional clamping, whereas SMDJ51CAH has no functional polarity. Replacing SMDJ51AH with SMDJ51CAH may compromise protection if the original design relies on unidirectional blocking behavior in SMDJ51AH.
What is the maximum clamping voltage of SMDJ51CAH under standard test conditions?
The maximum clamping voltage of SMDJ51CAH is 82.4V measured at 36.4A peak pulse current (IPPM) using the 10/1000µs waveform per Fig.5. This value defines the upper voltage limit imposed on protected circuitry during worst-case transients and is critical for ensuring downstream components remain within their absolute maximum ratings when using SMDJ51CAH.
SMDJ51CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMDJ51CAH FAQ
1.How can I place an order for SMDJ51CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ51CAH 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 SMDJ51CAH reliable?
The price and inventory of SMDJ51CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ51CAH is usually 5 days.
3.What payment methods are accepted for SMDJ51CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ51CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ51CAH?
SMDJ51CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ51CAH 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 SMDJ51CAH?
For technical support, including SMDJ51CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ51CAH requirements.
6.How does Aetrix verify that SMDJ51CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ51CAH 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 SMDJ51CAH meets industry standards.
7.What is the process for return or replacement of SMDJ51CAH?
All SMDJ51CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ51CAH, 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 SMDJ51CAH part is unused and in its original packaging.
Return procedure for SMDJ51CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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