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STMicroelectronics KD1084AV33
- Part No.:
- KD1084AV33
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
KD1084AV33.pdf
- Description:
- IC REG LINEAR 3.3V 5A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
KD1084AV33 from STMicroelectronics is a fixed-output 3.3 V, ±1 % tolerance, 5 A low-dropout linear voltage regulator in DPAK package, featuring 1.3 V typical dropout at full load and internal thermal/overcurrent protection. It delivers stable power to microcontroller cores, FPGA I/O banks, and industrial PLC modules requiring tight regulation and high current under wide temperature range (-40 °C to +125 °C).
For engineers reviewing the KD1084AV33 datasheet, KD1084AV33 pinout, KD1084AV33 application, or KD1084AV33 equivalent, this page provides verified electrical specs, thermal performance data, real-world load/line regulation behavior, and validated alternatives for industrial power rail design.
Technical Context
The KD1084AV33 uses an NPN-based pass transistor architecture with on-chip trimming for ±1 % output accuracy at 25 °C and ±2 % over -40 °C to +125 °C. Its quiescent current flows into the load-not wasted as bias-improving efficiency versus PNP regulators.
It achieves 60–72 dB supply voltage rejection at 120 Hz with 25 µF output capacitance and maintains stability with only 10 µF tantalum input/output capacitors. Internal thermal shutdown activates at junction temperatures exceeding +125 °C, and short-circuit current is limited to 5.5–7 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1 % at 25 °C; ±2 % over full temperature range-ensures reliable logic-level compliance for 3.3 V digital systems. |
| Max Output Current | 5 A continuous-supports high-current SoC/FPGA power domains without external parallel devices. |
| Dropout Voltage | 1.3 V typical at 5 A-enables operation from 4.6 V input (e.g., 5 V rail) while maintaining regulation. |
| Line Regulation | ≤6 mV over VI = 4.9–10 V at 25 °C-minimizes output drift during input rail fluctuations. |
| Load Regulation | ≤20 mV over IO = 0–5 A-maintains stable voltage across dynamic CPU/FPGA load transients. |
| Quiescent Current | 5–10 mA at VI ≤ 10 V-low static consumption improves system efficiency in always-on subsystems. |
| Thermal Resistance | RthJA = 100 °C/W (DPAK)-requires ≥2 cm² copper pour for full 5 A operation at +85 °C ambient. |
Pinout & Package
Supplied in surface-mount DPAK (TO-252) package with exposed thermal pad for enhanced heat dissipation. Pinout matches industry-standard 3-terminal adjustable regulators for drop-in compatibility in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Input (IN) | Main power input | Accepts 4.9–10 V DC; must be decoupled with ≥10 µF tantalum capacitor close to pin. |
| Ground (GND) | Reference and return path | Common reference for output and internal circuitry; connects to thermal pad for optimal heat transfer. |
| Output (OUT) | Regulated 3.3 V supply | Delivers up to 5 A; requires ≥10 µF output capacitance for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % output tolerance at 25 °C | Reduces need for post-regulation trimming in precision analog/digital mixed-signal systems. |
| 1.3 V dropout at 5 A | Enables use with 5 V input rails while delivering full rated current-critical for legacy 5 V infrastructure upgrades. |
| Quiescent current delivered to load | Improves overall power efficiency by ~0.5–1 % vs. PNP regulators in battery-backed or energy-sensitive applications. |
| Internal thermal & short-circuit protection | Eliminates need for external foldback circuits-reduces BOM count and PCB area in industrial control modules. |
| Stable with 10 µF tantalum capacitors | Simplifies layout and lowers cost vs. regulators requiring ceramic + ESR networks or larger bulk capacitance. |
Applications
| Industrial PLC I/O Modules | FPGA Configuration Power |
|---|---|
Use Scenario: Powering isolated digital I/O banks in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying FPGA configuration memory, GPIO buffers, and communication PHYs. Use Value: ±1 % tolerance ensures reliable SPI/I²C timing margins; 5 A capacity supports multi-channel isolation ICs and level translators simultaneously. | Use Scenario: Providing clean, regulated 3.3 V to FPGA configuration banks (e.g., Xilinx Spartan-7, Intel Cyclone V) during boot and runtime. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable VCCIO for configuration interface and JTAG pins. Use Value: Low 1.3 V dropout allows direct sourcing from 5 V backplane; thermal shutdown prevents damage during FPGA partial reconfiguration surges. |
| Embedded Microcontroller Core Rails | SCSI-2 Active Termination |
Use Scenario: Supplying core voltage to ARM Cortex-M7 or RISC-V SoCs in edge gateway devices with extended temperature requirements. IC Role / Device Role / Timing Role: Main 3.3 V regulator for processor core, DDR I/O, and peripheral interfaces. Use Value: -40 °C to +125 °C operation enables deployment in uncontrolled enclosures; ±2 % full-range tolerance meets ARM core AVS margin requirements. | Use Scenario: Implementing active termination on SCSI-2 bus lines where precise 2.85 V is required (via adjustable variant), but 3.3 V version used for auxiliary termination biasing. IC Role / Device Role / Timing Role: Secondary regulator providing stable bias for termination resistor networks and differential receivers. Use Value: Tight 3.3 V output ensures consistent common-mode voltage on SCSI differential pairs; low noise (<0.003 % RMS) minimizes jitter on high-speed data lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD1085V33 | Same 3.3 V fixed output, ±2 % tolerance (non-A grade), 3 A rating, higher 1.5 V dropout. | Limited to ≤3 A loads; suitable for lower-power MCU or sensor nodes where cost is prioritized over current headroom. | Select when 3 A suffices and budget constraints outweigh need for 5 A capability or ±1 % accuracy. |
| TLV1117-33CDCY | 3.3 V fixed, ±2 % tolerance, 800 mA max, 1.2 V dropout, SOT-223 package. | Not scalable to 5 A; intended for point-of-load regulation in space-constrained consumer electronics. | Choose only for sub-1 A applications where DPAK footprint is unacceptable and thermal limits permit SOT-223 mounting. |
Compared with LD1085V33 and TLV1117-33CDCY, KD1084AV33 uniquely combines 5 A current, ±1 % accuracy, and DPAK thermal performance-making it the sole option for high-reliability industrial 3.3 V rails demanding both precision and power density.
Availability
KD1084AV33 is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based edge accelerators, and embedded microcontroller platforms requiring stable component supply across long production lifecycles.
Supply support for KD1084AV33 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.
KD1084AV33 belongs to ST's high-current linear regulator product line, engineered specifically for industrial control, motor drive, and programmable logic systems needing robust, accurate, and thermally resilient local regulation.
FAQ
What is the minimum input voltage required for KD1084AV33 to maintain regulation at 5 A?
The minimum input voltage is VO + Vd = 3.3 V + 1.5 V = 4.8 V (max dropout). At 5 A, typical dropout is 1.3 V, so 4.6 V input sustains regulation. Input must remain ≥4.9 V per datasheet test conditions to guarantee performance across temperature and process variation.
Can KD1084AV33 replace older 78xx-series regulators in existing designs?
Yes-KD1084AV33 is pin-to-pin compatible with standard 3-terminal adjustable regulators like LM317 in DPAK footprint, but delivers superior performance: 1.3 V dropout vs. ~2 V for 78xx, ±1 % tolerance vs. ±5 %, and integrated thermal/short-circuit protection not found in legacy parts.
Is an external bypass capacitor required on the adjust pin for KD1084AV33?
No-KD1084AV33 is a fixed-output variant (3.3 V); it has no adjust pin. Only the adjustable versions (KD1084AXX/KD1084XX) require CADJ. This eliminates one BOM item and simplifies layout for fixed-voltage applications.
How does the thermal performance of KD1084AV33 compare between DPAK and D2PAK packages?
In DPAK, RthJA = 100 °C/W; in D2PAK, it drops to 62.5 °C/W. For 5 A operation at +85 °C ambient, DPAK requires ≥2 cm² copper pour to limit junction temperature below 125 °C, while D2PAK supports same load with smaller heatsinking-critical for space-constrained industrial modules.
KD1084AV33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
KD1084AV33 FAQ
1.How can I place an order for KD1084AV33 through Aetrix?
Please submit a Request for Quotation (RFQ) for KD1084AV33 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 KD1084AV33 reliable?
The price and inventory of KD1084AV33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KD1084AV33 is usually 5 days.
3.What payment methods are accepted for KD1084AV33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KD1084AV33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KD1084AV33?
KD1084AV33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KD1084AV33 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 KD1084AV33?
For technical support, including KD1084AV33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KD1084AV33 requirements.
6.How does Aetrix verify that KD1084AV33 is sourced from the original manufacturer or authorized distributors?
All KD1084AV33 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 KD1084AV33 meets industry standards.
7.What is the process for return or replacement of KD1084AV33?
All KD1084AV33 units undergo pre-shipment inspection (PSI). If there is an issue with KD1084AV33, 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 KD1084AV33 part is unused and in its original packaging.
Return procedure for KD1084AV33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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