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Taiwan Semiconductor Corporation 5.0SMDJ78AH
- Part No.:
- 5.0SMDJ78AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5.0SMDJ78AH.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,616
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Product details
Overview
5.0SMDJ78AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 5000W peak pulse power at 10/1000μs, 78V working standoff voltage, and 126V maximum clamping voltage at 39.7A peak current. It serves as primary overvoltage protection for automotive-grade I/O interfaces and AC/DC power supply inputs.
For engineers reviewing the 5.0SMDJ78AH datasheet, 5.0SMDJ78AH pinout, 5.0SMDJ78AH application, or 5.0SMDJ78AH equivalent, key selection criteria include its AEC-Q101 qualification, <1.0ps response time, 175°C max junction temperature, and DO-214AB mechanical compatibility with automated SMT placement.
Technical Context
This unidirectional TVS diode uses stacked-die construction to achieve high surge robustness while maintaining tight VBR tolerance (86.7–95.8V at 1mA). Its photo-glass passivated junction ensures stable leakage performance (<2µA at 78V) and long-term reliability under thermal cycling.
The device operates across –55°C to +175°C, with RθJA = 61°C/W on a 16mm × 16mm Cu pad PCB. Clamping behavior is characterized at 39.7A IPP, delivering 126V VC - critical for safeguarding downstream MOSFETs or controllers in 72V nominal bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 72V rail protection. |
| VBR @ IT=1mA | 86.7–95.8 V - Breakdown voltage range at test current; ensures predictable turn-on threshold under surge conditions. |
| VC @ IPP=39.7A | 126 V - Clamped voltage during 5000W 10/1000μs surge; determines maximum stress imposed on protected ICs. |
| PPPPM | 5000 W - Peak pulse power rating; supports IEC 61000-4-5 Level 4 (4kV) surge immunity in industrial power supplies. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| RθJA | 61 °C/W - Junction-to-ambient thermal resistance on standard PCB; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by band. Matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased surge | Connected to protected circuit ground or low-side return path; must handle full IPP without bond wire fusing. |
| Cathode | Current exit point during surge conduction | Connected to line side (e.g., input rail); polarity band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD-HBM/MM, enabling use in ADAS power domains. |
| Response time <1.0ps | Sub-nanosecond turn-on ensures suppression of fast transients (e.g., ISO 7637-2 pulse 1/2a) before sensitive logic is damaged. |
| Stacked die configuration | Enables higher energy absorption in same DO-214AB footprint versus single-die alternatives, preserving PCB area in space-constrained modules. |
| Photo-glass passivated junction | Reduces surface leakage and improves long-term stability in humid or contaminated environments (e.g., engine control units). |
Applications
| Automotive Power Input Protection | Industrial AC/DC Front-End |
|---|---|
Use Scenario: Protecting 72V battery-fed ECUs against load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry, shunting surge current to chassis ground. Use Value: Withstands 5000W surges while limiting voltage to 126V - below breakdown threshold of 150V-rated input FETs. | Use Scenario: Safeguarding rectified DC bus in DIN-rail mounted 48–75V SMPS units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor input, triggered only during positive overvoltage events. Use Value: 78V VWM provides 10% margin above nominal 72V bus, minimizing standby leakage while ensuring reliable clamping. |
| Telecom DC Power Interface | EV Charging Station Control Board |
Use Scenario: Securing -48V telecom power feeds against induced surges from nearby lightning strikes or switching noise. IC Role / Device Role / Timing Role: Reverse-connected unidirectional TVS referenced to system ground, absorbing positive transients on negative rail. Use Value: 175°C TJ max allows uninterrupted operation inside sealed outdoor cabinets with ambient temperatures up to 85°C. | Use Scenario: Protecting isolated CAN and digital I/O lines on EVSE control boards interfacing with vehicle BMS. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage auxiliary rails (e.g., 12V control supply), downstream of primary MOVs. Use Value: Fast <1.0ps response complements slower primary protectors, capturing residual high-frequency energy missed by MOVs. |
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 | Lower peak power (600W), same DO-214AA package, VC = 121V @ 35.3A | Not suitable for IEC 61000-4-5 Level 4; limited to consumer-grade or low-energy industrial ports | Select 5.0SMDJ78AH when 5000W surge immunity is required; SMBJ78A may be used where board space permits larger footprint but lower cost is prioritized. |
| SMCJ78A | Same DO-214AB package and 5000W rating, but VBR min = 86.7V (identical), VC = 126V (identical), AEC-Q101 not specified | Lacks automotive qualification; acceptable for industrial automation but not for OEM automotive designs | Choose 5.0SMDJ78AH for AEC-Q101 compliance; SMCCJ78A is viable where qualification is not mandated and sourcing flexibility is needed. |
Compared with SMBJ78A and SMCJ78A, the 5.0SMDJ78AH uniquely combines AEC-Q101 qualification, DO-214AB footprint, and verified 5000W surge capability - making it the only option qualified for safety-critical automotive power inputs requiring zero layout change from legacy SMCJ designs.
Availability
5.0SMDJ78AH is available at Aetrix Electronics and suitable for automotive power input protection, industrial AC/DC front-end design, and EV charging station control boards requiring stable component supply and long lifecycle support.
Supply support for 5.0SMDJ78AH 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 computing markets since 1979.
The 5.0SMDJxxAH series belongs to TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for high-reliability transient suppression in harsh-environment power systems where surge robustness and thermal stability are non-negotiable.
FAQ
What is the maximum clamping voltage of the 5.0SMDJ78AH under a 10/1000μs surge?
The 5.0SMDJ78AH has a maximum clamping voltage (VC) of 126 V at 39.7 A peak pulse current, measured under the standardized 10/1000μs waveform. This value is guaranteed across temperature and represents the upper limit of voltage seen by downstream components during worst-case surge events. The 5.0SMDJ78AH maintains this clamping performance while operating from –55°C to +175°C junction temperature.
Is the 5.0SMDJ78AH suitable for automotive applications?
Yes, the 5.0SMDJ78AH is AEC-Q101 qualified and designed for automotive use, including engine control units, body control modules, and ADAS power supplies. Its 175°C maximum junction temperature, photo-glass passivated junction, and JESD201 Class 2 whisker resistance support operation in under-hood environments. The 5.0SMDJ78AH meets requirements for load dump and ISO 7637-2 pulse testing when properly mounted.
What is the marking code for the 5.0SMDJ78AH on the device body?
The 5.0SMDJ78AH is marked with the code "5PGT" on its package surface. This 4-character alphanumeric code appears adjacent to the cathode band on the DO-214AB (SMC) case. The "5PGT" marking is unique to the 78V variant within the 5.0SMDJxxAH family and is used for visual identification and traceability during assembly and inspection.
Does the 5.0SMDJ78AH have bidirectional or unidirectional polarity?
The 5.0SMDJ78AH is a unidirectional TVS diode, meaning it conducts only during positive voltage excursions relative to its cathode terminal. It behaves like a Zener diode in reverse bias and blocks forward current up to 5 V at 100 A. This polarity is confirmed by its electrical specifications table listing only VBR(uni-directional) and absence of symmetric breakdown data. The 5.0SMDJ78AH requires correct orientation on PCB with cathode tied to the protected line.
What is the thermal resistance from junction to ambient for the 5.0SMDJ78AH?
The junction-to-ambient thermal resistance (RθJA) of the 5.0SMDJ78AH is 61°C/W when mounted on a standard 16 mm × 16 mm copper pad PCB per JEDEC test conditions. This value assumes no external heatsink and defines the temperature rise above ambient per watt of steady-state power dissipation. For the 5.0SMDJ78AH, this supports reliable operation at up to 6.25 W continuous power at 75°C lead temperature.
5.0SMDJ78AH 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
5.0SMDJ78AH FAQ
1.How can I place an order for 5.0SMDJ78AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 5.0SMDJ78AH 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 5.0SMDJ78AH reliable?
The price and inventory of 5.0SMDJ78AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5.0SMDJ78AH is usually 5 days.
3.What payment methods are accepted for 5.0SMDJ78AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5.0SMDJ78AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5.0SMDJ78AH?
5.0SMDJ78AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5.0SMDJ78AH 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 5.0SMDJ78AH?
For technical support, including 5.0SMDJ78AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5.0SMDJ78AH requirements.
6.How does Aetrix verify that 5.0SMDJ78AH is sourced from the original manufacturer or authorized distributors?
All 5.0SMDJ78AH 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 5.0SMDJ78AH meets industry standards.
7.What is the process for return or replacement of 5.0SMDJ78AH?
All 5.0SMDJ78AH units undergo pre-shipment inspection (PSI). If there is an issue with 5.0SMDJ78AH, 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 5.0SMDJ78AH part is unused and in its original packaging.
Return procedure for 5.0SMDJ78AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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