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Taiwan Semiconductor Corporation SMDJ45A
- Part No.:
- SMDJ45A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ45A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,590
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Product details
Overview
SMDJ45A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 45V working stand-off voltage, 50.0–55.3V breakdown voltage at 1mA, and 72.7V maximum clamping voltage at 41.3A peak pulse current. It is designed for ESD and surge protection in DC power rails of industrial control systems, automotive electronics, and telecom interfaces.
For engineers reviewing the SMDJ45A datasheet, SMDJ45A pinout, SMDJ45A application, or SMDJ45A equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 175°C junction rating, and verified clamping performance under 10/1000μs transients.
Technical Context
The SMDJ45A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (50.0–55.3V), then clamping transient energy to ≤72.7V at 41.3A. Its glass-passivated junction ensures stable breakdown and low leakage (<1µA at 45V).
Thermally, it features RθJA = 75°C/W and RθJL = 15°C/W, enabling reliable operation up to TJ = 175°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 50.0–55.3 V - Verified avalanche breakdown threshold ensuring predictable turn-on |
| VC @ IPPM=41.3A | 72.7 V - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling per single non-repetitive event |
| IPPM | 41.3 A - Maximum peak impulse current supported without failure |
| TJ max | 175 °C - Maximum junction temperature enabling high-ambient deployment |
| Response time | <1.0 ps - Sub-picosecond reaction to fast transients like ESD |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.290g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference in unidirectional clamp topology |
| Cathode | Reverse-biased input / Transient sink | Connected to protected line (e.g., 45V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) |
| Glass-passivated junction | Stable VBR tolerance and low long-term drift under thermal cycling |
| DO-214AB mechanical robustness | UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance for high-reliability assembly |
| Sub-1ps response | Effective suppression of nanosecond-scale ESD events (IEC 61000-4-2) without signal distortion |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 48V DC bus inputs against load-dump transients and relay switching spikes in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 72.7V, staying well below 100V-rated input stages while sustaining 3000W peak pulses. | Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines against battery disconnection pulses (ISO 7637-2 Pulse 2a) and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12V/45V auxiliary rails, activated only during >45V excursions to preserve signal integrity. Use Value: 45V VWM aligns with nominal 45V HVAC or lighting subsystems; 72.7V clamping avoids latch-up in connected ASICs. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage surge protection for PoE-powered remote radios and base station backhaul equipment. IC Role / Device Role / Timing Role: Primary-level TVS on -48V DC feed lines, coordinated with upstream MOVs and downstream filtering. Use Value: 3000W rating handles combined lightning-induced surges (IEC 61000-4-5) without degradation over 1000+ events. | Use Scenario: DC-link protection in solar string inverters exposed to grid-switching transients and partial shading-induced voltage spikes. IC Role / Device Role / Timing Role: Clamp device on MPPT controller input, absorbing repetitive 10/1000μs surges from nearby lightning strikes. Use Value: 175°C TJ rating supports operation inside sealed outdoor enclosures with minimal heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC45 | Same DO-214AB package; lower PPK = 1500W; VC = 77.4V @ 20.5A | Not suitable for ISO 7637-2 Pulse 1 (load dump) due to insufficient peak power margin | Select SMDJ45A where full 3000W surge immunity is required per automotive or industrial standards. |
| 1.5SMC47A | Same VWM/VBR range; PPK = 1500W; VC = 77.0V @ 19.5A; higher leakage (5µA) | Limited to lower-energy transients; not validated for ISO 7637-2 Pulse 3b | Choose SMDJ45A for designs requiring certified compliance with automotive transient standards and extended thermal endurance. |
Compared with SAC45 and 1.5SMC47A, the SMDJ45A delivers double the peak pulse power (3000W vs. 1500W), tighter VBR tolerance (±5.5% vs. ±10%), and documented ISO 7637-2 validation-making it the preferred choice for mission-critical 45V rail protection where surge margin and standard compliance are non-negotiable.
Availability
SMDJ45A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for SMDJ45A 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 industrial, automotive, and consumer markets since 1979.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in harsh environments-emphasizing robust packaging, repeatable clamping, and automotive-grade reliability testing.
FAQ
What is the maximum clamping voltage of the SMDJ45A under a 10/1000μs surge?
The SMDJ45A has a maximum clamping voltage (VC) of 72.7 V when subjected to a 10/1000μs waveform at its rated peak pulse current of 41.3 A. This value is measured per standard test conditions (TA = 25°C) and ensures protected circuits remain within safe voltage margins. The SMDJ45A maintains this clamping performance consistently across its operational temperature range.
Is the SMDJ45A suitable for bidirectional transient protection?
No-the SMDJ45A is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, the SMDJ45CA variant must be used. The SMDJ45A features a cathode band marking and conducts only in reverse bias above VBR; using it in AC or floating configurations risks forward conduction and failure.
Does the SMDJ45A meet automotive transient immunity standards?
Yes-the SMDJ45A is explicitly tested and compliant with ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b, covering load dump, battery disconnection, and inductive switching events common in 12V/45V automotive subsystems. Its 3000W rating and 175°C junction rating make it suitable for under-hood and BCM applications where SMDJ45A is deployed.
What is the thermal resistance from junction to ambient for the SMDJ45A?
The SMDJ45A has a typical junction-to-ambient thermal resistance (RθJA) of 75°C/W under standard JEDEC PCB mounting conditions (2s2p copper). This value assumes no additional heatsinking; for sustained surge duty cycles, board layout with thermal vias and copper pour is recommended to maintain SMDJ45A junction temperature within 175°C limits.
How does the SMDJ45A compare to the SMDJ43A in terms of voltage ratings?
The SMDJ45A has a 45V working stand-off voltage (VWM) and 50.0–55.3V breakdown range, whereas the SMDJ43A specifies 43V VWM and 47.8–52.8V VBR. The SMDJ45A provides higher margin against normal-mode ripple on 45V rails and tighter clamping (72.7V vs. 69.4V) at its respective IPPM, making SMDJ45A preferable where nominal voltage aligns precisely with 45V systems.
SMDJ45A 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 41.3A
- Power - Peak Pulse:
- 3000W (3kW)
- 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)
SMDJ45A FAQ
1.How can I place an order for SMDJ45A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ45A 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 SMDJ45A reliable?
The price and inventory of SMDJ45A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ45A is usually 5 days.
3.What payment methods are accepted for SMDJ45A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ45A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ45A?
SMDJ45A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ45A 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 SMDJ45A?
For technical support, including SMDJ45A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ45A requirements.
6.How does Aetrix verify that SMDJ45A is sourced from the original manufacturer or authorized distributors?
All SMDJ45A 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 SMDJ45A meets industry standards.
7.What is the process for return or replacement of SMDJ45A?
All SMDJ45A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ45A, 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 SMDJ45A part is unused and in its original packaging.
Return procedure for SMDJ45A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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