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STMicroelectronics KD1084ADT-R
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- Part No.:
- KD1084ADT-R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
KD1084ADT-R.pdf
- Description:
- IC REG LINEAR POS ADJ 5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
KD1084ADT-R from STMicroelectronics is a 5 A low-dropout adjustable positive voltage regulator in DPAK package, featuring ±1% output voltage tolerance at 25 °C, 1.3 V typical dropout at full load, and guaranteed operation from –40 °C to +125 °C. It delivers stable regulation for high-current industrial power rails where thermal efficiency and tight output accuracy are critical.
For engineers reviewing the KD1084ADT-R datasheet, KD1084ADT-R pinout, KD1084ADT-R application, or KD1084ADT-R equivalent, key selection criteria include dropout voltage at 5 A, adjust-pin current stability (55–120 µA), thermal resistance (RthJA = 100 °C/W), and compatibility with minimal 10 µF output capacitance.
Technical Context
The KD1084ADT-R uses an NPN-based pass transistor architecture that routes quiescent current into the load-unlike PNP regulators-improving conversion efficiency. Its internal trimming enables ±1% initial output tolerance and supports adjustable output via external resistor divider (VOUT = 1.25 V × (1 + R2/R1)).
Thermal protection and current limiting are implemented on-chip, with short-circuit current rated at 5.5–7 A and thermal regulation of 0.003–0.015 %/W. Dropout voltage remains ≤1.5 V across –40 °C to +125 °C junction temperature at 5 A load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 5 A continuous; enables single-regulator replacement of multiple lower-current LDOs in power distribution networks. |
| Dropout Voltage | 1.3 V typical at 5 A; allows operation with only 1.3 V headroom above output, e.g., 5 V input for 3.7 V rail. |
| Output Tolerance | ±1% at 25 °C, ±2% over full temperature range; ensures precise biasing for ADC references or FPGA core supplies. |
| Quiescent Current | 3–10 mA; flows into load-not wasted-raising efficiency by ~0.5% at 5 A vs. comparable PNP regulators. |
| Adjust Pin Current | 55–120 µA; stable across VI (2.85–10 V) and IO (10 mA–5 A), enabling accurate resistor-divider design without current-induced error. |
| Supply Rejection | 60–72 dB at 120 Hz; suppresses ripple from upstream switching converters feeding the LDO input. |
| Thermal Resistance | RthJA = 100 °C/W (DPAK); requires ≥2 cm² copper pour for full 5 A operation at 125 °C ambient. |
Pinout & Package
Supplied in industry-standard DPAK (TO-252) package with exposed drain pad for thermal conduction. Mounting requires soldered thermal pad to PCB copper plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Main DC input supply; must be ≥ (VOUT + Vd) and ≤12 V absolute max. |
| 2 (Ground) | GND | Reference node for both output and adjust circuitry; low-impedance connection required for stability. |
| 3 (Output) | VOUT | Regulated output; connects to load and feedback network; minimum 10 µF tantalum capacitor required. |
| 4 (Adjust) | ADJ | Sense node for external resistor divider; sets output as VOUT = 1.25 V × (1 + R2/R1). |
Key Features
| Feature | Design Value |
|---|---|
| NPN pass transistor architecture | Directs quiescent current into load-reducing total system power loss by up to 50 mW at 5 A vs. PNP alternatives. |
| On-chip trimming | Enables ±1% output tolerance at 25 °C without external calibration-reducing BOM count and test time. |
| Internal thermal & current limit | Self-protects during overload or ambient rise; no external shutdown circuit needed for basic industrial use cases. |
| Low ESR capacitor support | Stable with 10 µF tantalum (or ≥22 µF ceramic); eliminates need for costly low-ESR polymer capacitors. |
| SCSI-2 termination compatible | 2.85 V fixed variant available; this adjustable version supports custom termination voltages in legacy bus systems. |
Applications
| Industrial Motor Drive Power Rails | FPGA Core Supply Regulation |
|---|---|
|
Use Scenario: Regulating 3.3 V or 2.5 V core rails for Xilinx Artix-7 or Intel Cyclone V FPGAs in programmable logic controllers. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise voltage to FPGA VCCINT pins with fast transient response. Use Value: 7–20 mV load regulation ensures <±0.6% voltage deviation during logic state transitions, preventing timing violations. |
Use Scenario: Providing stable 1.2 V or 1.8 V supply to microcontroller cores in factory automation gateways. IC Role / Device Role / Timing Role: Adjustable LDO generating processor core voltage from intermediate 5 V or 12 V bus. Use Value: ±1% initial tolerance and 0.5% long-term stability maintain CPU clock margin integrity over 10+ years of field operation. |
| Telecom Line Card Biasing | Test Equipment Power Subsystem |
|
Use Scenario: Generating precise ±1.25 V reference rails for analog front-end amplifiers in optical transceiver modules. IC Role / Device Role / Timing Role: Precision voltage source for op-amp biasing and DAC reference buffers. Use Value: 0.003% RMS noise (10 Hz–10 kHz) prevents SNR degradation in 16-bit data acquisition paths. |
Use Scenario: Powering digital I/O banks and analog signal chains in benchtop multimeters and oscilloscope front-ends. IC Role / Device Role / Timing Role: High-current, low-drift local regulator isolating sensitive measurement circuits from noisy main supply. Use Value: 60–72 dB supply rejection at 120 Hz attenuates mains-borne ripple, preserving measurement accuracy to 0.01% FS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDR2G | 200 mA max output, ±2% tolerance, higher 2 V dropout, RthJA = 170 °C/W | Limited to low-power analog subsystems; unsuitable for >1 A loads or thermally constrained layouts | Select when cost sensitivity outweighs current capability and thermal performance requirements. |
| LT1963AEDD-3.3 | 1.5 A max, ±1% tolerance, 340 mV dropout at 1.5 A, integrated enable pin | Lower current rating and no adjust pin-requires fixed-output variants for non-standard voltages | Choose for space-constrained designs needing ultra-low dropout and enable control, not 5 A scalability. |
Compared with LM317LDR2G and LT1963AEDD-3.3, the KD1084ADT-R uniquely combines 5 A output, ±1% tolerance, and DPAK thermal performance-making it the only drop-in solution for high-current industrial LDO upgrades requiring minimal board rework.
Availability
KD1084ADT-R is available at Aetrix Electronics and suitable for industrial motor drives, FPGA power management, telecom line cards, and test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for KD1084ADT-R 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 applications since 1987.
The KD1084 series belongs to ST's high-current linear regulator product line, engineered specifically for industrial power systems demanding robust thermal behavior, tight output accuracy, and compatibility with legacy 3-terminal regulator footprints.
FAQ
What is the minimum output capacitor required for stability with KD1084ADT-R?
The datasheet specifies a minimum 10 µF tantalum capacitor at the output for guaranteed stability across all operating conditions. Ceramic capacitors may be used if ≥22 µF and ESR ≥10 mΩ; lower ESR values require additional series resistance per Figure 4 in ST Doc ID 8761 Rev 11.
Can KD1084ADT-R replace older 3-terminal adjustable regulators like LM317 in existing designs?
Yes-KD1084ADT-R is pin-to-pin compatible with standard TO-220 and DPAK-mounted adjustable regulators. However, its higher output current and lower dropout require verification of PCB copper area and input voltage headroom; thermal pad soldering is mandatory for DPAK mounting.
Does KD1084ADT-R include reverse-voltage or reverse-current protection?
No-the device lacks built-in reverse-voltage or reverse-current blocking. External protection (e.g., series Schottky diode on input or back-to-back MOSFETs) is required if the application risks input reversal or output sinking during fault conditions.
How does the adjust pin current variation affect output voltage accuracy?
Adjust pin current varies only 0.2–5 µA across input voltage and load range; when using standard 1% resistors (e.g., 240 Ω/1.8 kΩ for 12 V), this contributes <0.02% error-well within the ±1% total tolerance budget at 25 °C.
KD1084ADT-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 10.5V
- 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:
- Surface Mount
- Supplier Device Package:
- DPAK
KD1084ADT-R FAQ
1.How can I place an order for KD1084ADT-R through Aetrix?
Please submit a Request for Quotation (RFQ) for KD1084ADT-R 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 KD1084ADT-R reliable?
The price and inventory of KD1084ADT-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KD1084ADT-R is usually 5 days.
3.What payment methods are accepted for KD1084ADT-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KD1084ADT-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KD1084ADT-R?
KD1084ADT-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KD1084ADT-R 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 KD1084ADT-R?
For technical support, including KD1084ADT-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KD1084ADT-R requirements.
6.How does Aetrix verify that KD1084ADT-R is sourced from the original manufacturer or authorized distributors?
All KD1084ADT-R 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 KD1084ADT-R meets industry standards.
7.What is the process for return or replacement of KD1084ADT-R?
All KD1084ADT-R units undergo pre-shipment inspection (PSI). If there is an issue with KD1084ADT-R, 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 KD1084ADT-R part is unused and in its original packaging.
Return procedure for KD1084ADT-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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