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STMicroelectronics L7809CD2T-TR
- Part No.:
- L7809CD2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7809CD2T-TR.pdf
- Description:
- IC REG LINEAR 9V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,578
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Product details
Overview
L7809CD2T-TR from STMicroelectronics is a fixed-output +9 V, 1.5 A positive linear voltage regulator in D²PAK surface-mount package. It integrates thermal overload protection, short-circuit current limiting, and safe operating area (SOA) protection. Designed for local on-card regulation in industrial power supplies and embedded control systems, it delivers stable output with ±4.5% tolerance over temperature and load.
For engineers reviewing the L7809CD2T-TR datasheet, L7809CD2T-TR pinout, L7809CD2T-TR application, or L7809CD2T-TR equivalent, key selection criteria include dropout voltage (2 V @ 1 A), output noise (70 µV/VO), load regulation (≤180 mV), and junction temperature range (0 to 125 °C).
Technical Context
This three-terminal monolithic IC uses internal bandgap reference and error amplifier feedback to maintain regulated output under varying input (11.5–26 V) and load (5 mA–1.5 A) conditions. Its SOA protection dynamically limits power dissipation during transient overloads without latch-up.
The device operates without external components for basic regulation but supports adjustable output via external resistors. Input-to-output differential must exceed 2 V for regulation; minimum load current is 5 mA to ensure stability with 0.33 µF input and 0.1 µF output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9 V nominal, 8.55–9.45 V over full load/temperature range - ensures compatibility with 9 V logic and analog rails |
| Max Output Current | 1.5 A continuous - supports mid-power microcontroller systems and sensor interfaces |
| Dropout Voltage | 2 V @ 1 A, 25 °C - requires minimum 11 V input for stable 9 V output |
| Line Regulation | ≤180 mV over VI = 11.5–26 V - maintains output stability across wide input transients |
| Load Regulation | ≤180 mV over IO = 5 mA–1.5 A - minimizes voltage sag during dynamic load steps |
| Output Noise | 70 µV/VO (10 Hz–100 kHz) - suitable for noise-sensitive analog circuitry |
| Thermal Resistance | RthJC = 3 °C/W - enables high-power operation with minimal heatsink mass |
Pinout & Package
D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation; thermally optimized for PCB copper pour mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input | Accepts 11.5–26 V; must be decoupled with ≥0.33 µF ceramic capacitor |
| 2 (Ground) | Reference and return path | Common node for input/output capacitors and load; low-impedance PCB trace required |
| 3 (Output) | Regulated +9 V supply | Delivers up to 1.5 A; requires ≥0.1 µF ceramic output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Activates at ~165 °C junction temperature, auto-recovering after cooldown - prevents permanent damage during sustained overload |
| Short-circuit current limit | 0.4 A typical short-circuit current - limits fault energy while maintaining system-level fault isolation |
| SOA protection | Prevents secondary breakdown during simultaneous high-voltage/high-current stress - eliminates need for external foldback circuitry |
| Low quiescent current | 8 mA max at 25 °C - reduces no-load power loss in battery-backed or standby systems |
| Wide operating temperature | 0 to 125 °C junction range - qualified for industrial ambient environments without derating |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering digital isolators and CAN transceivers in modular I/O racks with shared 24 V bus. IC Role / Device Role / Timing Role: Local +9 V rail generation with ripple rejection >55 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters. Use Value: Eliminates single-point regulation distribution losses; SOA protection sustains operation during field-wiring shorts. | Use Scenario: Supplying microcontroller peripherals (LIN transceivers, EEPROM, sensors) in door module ECUs. IC Role / Device Role / Timing Role: Stable 9 V bias for analog front-ends and logic interfaces - maintains ADC accuracy and communication integrity across -40 to 125 °C. Use Value: Thermal shutdown prevents latch-up during hot-car soak; D²PAK package enables compact layout with thermal relief. |
| Medical Patient Monitor Front-Ends | Point-of-Sale Terminal Power Management |
Use Scenario: Providing clean +9 V for op-amp signal conditioning stages in ECG/SpO₂ analog acquisition paths. IC Role / Device Role / Timing Role: Low-noise (70 µV/VO), low-drift (-1 mV/°C) regulation - preserves signal-to-noise ratio and calibration stability. Use Value: Output resistance of 17 mΩ minimizes load-induced offset; no external compensation required. | Use Scenario: Regulating 9 V for thermal print head drivers and smart card readers in retail terminals. IC Role / Device Role / Timing Role: High-current capability (1.5 A) with fast short-circuit response - handles pulsed print-head loads without brownout. Use Value: Internal current limiting avoids fuse replacement; D²PAK thermal performance supports fanless enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-9.0/NOPB | Lower max current (1 A), higher dropout (0.5 V @ 100 mA), integrated reverse-battery protection | Better suited for automotive battery-connected inputs with load dump immunity | Select when reverse-polarity protection is mandatory and 1 A suffices |
| MC7809CD2TG | Same electrical specs, TO-263-3 (D²PAK) package, but ON Semiconductor branding and slightly looser initial tolerance (±5% vs ±4.5%) | Drop-in mechanical replacement with identical thermal profile and footprint | Select for multi-source procurement where ST part availability is constrained |
Compared with LM2940CT-9.0/NOPB, L7809CD2T-TR offers 50% higher output current and tighter line/load regulation but lacks reverse-battery protection; compared with MC7809CD2TG, it provides marginally better output voltage tolerance and is qualified to ST's industrial reliability standards.
Availability
L7809CD2T-TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical front-ends, and point-of-sale terminals requiring stable component supply and long-term production continuity.
Supply support for L7809CD2T-TR 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
L7809CD2T-TR belongs to the L78 series of fixed-voltage linear regulators, designed specifically for robust local regulation in cost-sensitive, high-reliability embedded power systems where simplicity, thermal resilience, and proven field performance are critical.
FAQ
What is the minimum input voltage required for regulation?
The L7809CD2T-TR requires a minimum input voltage of 11.5 V to maintain 9 V output under full 1.5 A load and 25 °C junction temperature, based on its 2 V dropout specification. At higher temperatures or loads, input should be increased to maintain regulation margin.
Can this regulator be used with an input voltage above 26 V?
No - absolute maximum input voltage is 35 V for VO = 9 V, but continuous operation above 26 V violates recommended operating conditions per DS0422 Rev 38 and risks thermal runaway due to excessive power dissipation in the D²PAK package.
Is an input capacitor mandatory?
Yes - a minimum 0.33 µF ceramic capacitor placed within 1 cm of the input pin is required for stability and transient response. Omitting it may cause oscillation or failure to regulate under fast load changes, as confirmed in ST's test circuits (Figure 4, DS0422).
Does this part support adjustable output voltage configurations?
Yes - though optimized for fixed 9 V operation, the L7809CD2T-TR can be configured as an adjustable regulator using external resistors per ST's application note AN2817, enabling outputs from 9 V up to 35 V with appropriate input headroom and thermal management.
L7809CD2T-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 55dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
L7809CD2T-TR FAQ
1.How can I place an order for L7809CD2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L7809CD2T-TR 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 L7809CD2T-TR reliable?
The price and inventory of L7809CD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7809CD2T-TR is usually 5 days.
3.What payment methods are accepted for L7809CD2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7809CD2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7809CD2T-TR?
L7809CD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7809CD2T-TR 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 L7809CD2T-TR?
For technical support, including L7809CD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7809CD2T-TR requirements.
6.How does Aetrix verify that L7809CD2T-TR is sourced from the original manufacturer or authorized distributors?
All L7809CD2T-TR 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 L7809CD2T-TR meets industry standards.
7.What is the process for return or replacement of L7809CD2T-TR?
All L7809CD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7809CD2T-TR, 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 L7809CD2T-TR part is unused and in its original packaging.
Return procedure for L7809CD2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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