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Taiwan Semiconductor Corporation 5.0SMDJ78A
- Part No.:
- 5.0SMDJ78A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5.0SMDJ78A.pdf
- Description:
- 5000W, 91.3V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,989
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Product details
Overview
5.0SMDJ78A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and I/O interfaces. It features a 78 V working standoff voltage, 86.7–95.8 V breakdown voltage at 1 mA, 39.7 A peak pulse current (10/1000 µs), 126 V maximum clamping voltage, and 5000 W peak pulse power dissipation. It is used in AC/DC power supplies to safeguard downstream regulators and controllers against lightning-induced surges.
For engineers reviewing the 5.0SMDJ78A datasheet, 5.0SMDJ78A pinout, 5.0SMDJ78A application, or 5.0SMDJ78A equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, thermal resistance (RθJL = 16 °C/W), moisture sensitivity level (MSL 1), and DO-214AB (SMC) package compatibility with automated SMT placement.
Technical Context
The 5.0SMDJ78A employs a stacked-die construction in a unidirectional configuration, enabling robust surge handling without reverse conduction during normal operation. Its photo-glass passivated junction ensures stable leakage (<2 µA at 78 V) and long-term reliability under repeated transients.
With a typical response time under 1.0 ps and a junction temperature range of –55 °C to +175 °C, it supports industrial and automotive power rail protection where fast clamping and thermal resilience are critical. The device is rated for 5000 W peak pulse power per 10/1000 µs waveform and derates linearly above 25 °C ambient per published curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for safe DC bias in protected circuit. |
| VBR @ IT=1 mA | 86.7–95.8 V - Measured breakdown threshold; defines onset of avalanche conduction under standardized test conditions. |
| VC @ IPP=39.7 A | 126 V - Clamping voltage during 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPPSM | 5000 W - Peak pulse power rating; quantifies single-event surge energy absorption capability. |
| RθJL | 16 °C/W - Junction-to-lead thermal resistance; enables accurate PCB copper pad thermal design for sustained power dissipation. |
| MSL Level | Level 1 per J-STD-020 - No floor life limitation; suitable for standard reflow without dry-pack or baking requirements. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS placement. |
| Cathode | Current exit terminal during clamping | Connected to protected line (e.g., +VIN) - polarity band identifies this terminal; reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Peak pulse power | 5000 W at 10/1000 µs - Enables protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without derating. |
| Clamping ratio (VC/VBR) | ~1.31 - Low ratio ensures minimal overvoltage overshoot during transient events. |
| Junction temperature range | –55 °C to +175 °C - Supports operation in under-hood automotive and industrial power supply environments. |
| Response time | <1.0 ps - Faster than most semiconductor switching transients, ensuring clamping occurs before sensitive logic is disturbed. |
Applications
| AC/DC Power Input Stage | I/O Interface Protection |
|---|---|
Use Scenario: Protecting primary-side rectifier outputs and secondary-side DC bus rails in offline SMPS against lightning-induced surges and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between DC rail and ground to clamp positive-going transients while blocking reverse leakage. Use Value: Limits rail voltage to ≤126 V during 39.7 A surges, preventing overvoltage failure of bulk capacitors and controller ICs rated ≤130 V. | Use Scenario: Safeguarding RS-485 transceivers, CAN nodes, and industrial digital I/O lines exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Standoff-mode protector on signal lines, leveraging low leakage (<2 µA at 78 V) to avoid loading active circuits. Use Value: Clamps fast transients within sub-nanosecond response window, preserving signal integrity and meeting IEC 61000-4-2 Level 4 (15 kV air) immunity requirements. |
| Automotive Body Control Module | Industrial PLC Analog Input Protection |
Use Scenario: Protecting 12 V/24 V battery-fed microcontroller power rails in BCMs subjected to ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Primary surge limiter on switched VBAT inputs, mounted directly at connector entry point. Use Value: Withstands 5000 W pulses and operates up to +175 °C junction temperature, satisfying AEC-Q101 stress testing requirements. | Use Scenario: Shielding 4–20 mA current loop receivers and precision ADC front-ends from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: High-VWM TVS placed across input terminals to prevent latch-up or damage during sensor cable faults. Use Value: 78 V standoff allows use with 48 V auxiliary supplies while maintaining 126 V clamping ceiling - sufficient headroom for 24-bit ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A | Same DO-214AB package; lower peak power (600 W vs. 5000 W); higher clamping voltage (127 V vs. 126 V). | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients like ESD or inductive kickback. | Select 5.0SMDJ78A when full 5000 W surge immunity is required; SMBJ78A only for space-constrained, low-energy use cases. |
| SMCJ78A | Same 5000 W rating and DO-214AB package; identical VWM, VBR, and VC; differs only in manufacturer-specific process and qualification. | No functional difference; both meet same IEC/ISO surge standards and thermal specs. | SMCJ78A is a direct functional alternative with equivalent performance; choose based on supply chain availability and qualification history. |
Compared with SMBJ78A, the 5.0SMDJ78A delivers 8.3× higher surge power handling and tighter clamping control-critical for mains-connected equipment. Against SMCJ78A, it offers identical electrical behavior but may differ in MSL compliance documentation and long-term parametric drift characteristics per Taiwan Semiconductor's process control.
Availability
5.0SMDJ78A is available at Aetrix Electronics and suitable for AC/DC power supplies, industrial I/O interfaces, and automotive body control modules requiring stable component supply and full IEC 61000-4-5 compliance.
Supply support for 5.0SMDJ78A 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 component manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The 5.0SMDJ series was developed specifically for high-reliability, high-power surge protection in industrial power conversion and transportation electronics, emphasizing rugged packaging, MSL-1 process control, and extended temperature operation.
FAQ
What is the maximum clamping voltage of the 5.0SMDJ78A under a 10/1000 µs surge?
The 5.0SMDJ78A has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 39.7 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and represents the highest voltage seen across the device during surge conduction. Designers must ensure that downstream components have voltage ratings exceeding 126 V to maintain margin. The 5.0SMDJ78A achieves this clamping performance while dissipating 5000 W peak power.
Is the 5.0SMDJ78A unidirectional or bidirectional, and how is polarity identified?
The 5.0SMDJ78A is a unidirectional TVS diode, meaning it conducts only during positive voltage transients applied to its cathode relative to anode. Polarity is marked by a distinct cathode band on the DO-214AB (SMC) package body. During normal operation, it blocks reverse current up to 78 V; during a surge, it avalanches to clamp excess voltage. This configuration avoids leakage issues common in bidirectional devices and is preferred for DC rail protection. The 5.0SMDJ78A datasheet confirms unidirectional behavior in all electrical tables and application diagrams.
What is the thermal resistance from junction to lead (RθJL) for the 5.0SMDJ78A, and why does it matter?
The 5.0SMDJ78A has a junction-to-lead thermal resistance (RθJL) of 16 °C/W, measured with the device mounted on a 16 mm × 16 mm copper pad PCB. This parameter directly impacts steady-state power handling: at 6.25 W dissipation (its rated PD), the junction rises ~100 °C above lead temperature. Accurate RθJL enables thermal modeling of PCB copper area and heatsinking. For reliable long-term operation, designers must ensure the 5.0SMDJ78A's leads remain below 75 °C ambient to avoid exceeding its 175 °C max junction temperature.
Does the 5.0SMDJ78A require special handling for moisture sensitivity?
No-the 5.0SMDJ78A is rated Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has no floor life limitation and can be stored indefinitely at ambient conditions without dry packing or baking prior to reflow. This simplifies manufacturing logistics and eliminates yield loss from popcorning during soldering. The 5.0SMDJ78A's glass-passivated junction and robust molding compound contribute to this high MSL rating, making it ideal for high-volume SMT assembly lines where handling efficiency is critical.
How does the 5.0SMDJ78A compare to the 5.0SMDJ75A in terms of voltage ratings and application suitability?
The 5.0SMDJ78A has a 78 V working standoff voltage (VWM) versus 75 V for the 5.0SMDJ75A, with corresponding breakdown voltages of 86.7–95.8 V and 83.3–92.1 V, respectively. Its clamping voltage is 126 V vs. 121 V. This 3 V higher VWM makes the 5.0SMDJ78A better suited for 72–80 V nominal systems (e.g., 48 V telecom with 20 % tolerance), while the 5.0SMDJ75A fits tighter 72 V rails. Both share identical 5000 W rating and DO-214AB package, so PCB layout is interchangeable if voltage margins allow.
5.0SMDJ78A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 5.0SMDJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 39.7A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
5.0SMDJ78A FAQ
1.How can I place an order for 5.0SMDJ78A through Aetrix?
Please submit a Request for Quotation (RFQ) for 5.0SMDJ78A 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 5.0SMDJ78A reliable?
The price and inventory of 5.0SMDJ78A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5.0SMDJ78A is usually 5 days.
3.What payment methods are accepted for 5.0SMDJ78A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5.0SMDJ78A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5.0SMDJ78A?
5.0SMDJ78A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5.0SMDJ78A 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 5.0SMDJ78A?
For technical support, including 5.0SMDJ78A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5.0SMDJ78A requirements.
6.How does Aetrix verify that 5.0SMDJ78A is sourced from the original manufacturer or authorized distributors?
All 5.0SMDJ78A 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 5.0SMDJ78A meets industry standards.
7.What is the process for return or replacement of 5.0SMDJ78A?
All 5.0SMDJ78A units undergo pre-shipment inspection (PSI). If there is an issue with 5.0SMDJ78A, 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 5.0SMDJ78A part is unused and in its original packaging.
Return procedure for 5.0SMDJ78A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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