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STMicroelectronics L7809ABD2T-TR
- Part No.:
- L7809ABD2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7809ABD2T-TR.pdf
- Description:
- IC REG LINEAR 9V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,168
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Product details
Overview
L7809ABD2T-TR from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 9 V ±2% output at up to 1.5 A, with thermal overload, short-circuit, and safe operating area (SOA) protection. It operates across –40 °C to +125 °C junction temperature and supports local on-card regulation in industrial power supplies, automotive body electronics, and embedded control systems.
For engineers reviewing the L7809ABD2T-TR datasheet, L7809ABD2T-TR pinout, L7809ABD2T-TR application, or L7809ABD2T-TR equivalent, this device is selected for robustness in unregulated input environments (up to 35 V), low-noise analog subsystems requiring ≤70 µV/VO output noise, and designs needing guaranteed performance over extended temperature ranges without external compensation.
Technical Context
This IC implements a monolithic series-pass linear regulator architecture with internal current limiting, thermal shutdown, and SOA protection-enabling fault resilience without external circuitry. Its fixed 9 V output is trimmed at wafer level for ±2% tolerance across temperature and load.
Designed for use with minimal external components (input/output capacitors only), it delivers stable regulation under line variations (VI = 11.5–22 V) and load steps (5 mA–1.5 A), with dropout voltage held at 2 V at 1 A and supply voltage rejection of 61 dB at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 9 V ±2% (guaranteed over –40 °C to +125 °C, 5 mA–1 A load) |
| Max Output Current | 1.5 A (internally limited; requires adequate heatsinking above ~1 A) |
| Input Voltage Range | 11.5 V to 22 V (for full spec compliance); absolute max 35 V |
| Droput Voltage | 2 V at 1 A and 25 °C (defines minimum VI–VO margin for regulation) |
| Supply Rejection | 61 dB at 120 Hz (attenuates ripple from unregulated DC sources) |
| Output Noise | 70 µV/VO (10 Hz–100 kHz bandwidth; critical for analog sensor interfaces) |
| Thermal Range | –40 °C to +125 °C operating junction temperature (A-grade industrial/automotive) |
| Protection Features | Thermal shutdown, short-circuit current limit (0.4 A continuous), SOA foldback |
Pinout & Package
Supplied in D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin configuration: Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Unregulated DC input | Accepts 11.5–22 V nominal; withstands up to 35 V transient |
| Pin 2 (GND) | Reference and return path | Common node for input capacitor, output capacitor, and load return |
| Pin 3 (OUT) | Regulated 9 V output | Delivers up to 1.5 A; requires 0.1 µF ceramic CO for stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 9 V output with ±2% tolerance | Eliminates need for external feedback resistors; ensures consistent rail accuracy across production lots |
| Extended temperature operation (–40 °C to +125 °C) | Validated for under-hood automotive and industrial control environments without derating |
| Integrated SOA protection | Prevents destruction during sustained overload or high VI–VO differential without external foldback circuitry |
| Low quiescent current (4.3–6 mA) | Minimizes standby power loss in battery-backed or energy-sensitive applications |
| Thermal resistance (RthJC = 3 °C/W) | Enables >1 A continuous output with PCB copper pour as heatsink-no discrete heatsink required |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor signal conditioning circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local 9 V rail generator for 24 V field-side interface circuitry, decoupling noise from shared system supply. Use Value: Internal thermal shutdown prevents latch-up during 4–20 mA loop faults; ±2% output ensures ADC reference stability. |
Use Scenario: Supplying microcontroller peripherals (CAN transceivers, LIN drivers, LED drivers) in door module ECUs. IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (12 V nominal), tolerant of cold-crank (–40 °C) and load-dump transients. Use Value: Guaranteed operation to +125 °C enables placement near power MOSFETs; 61 dB SVR suppresses alternator ripple. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
Use Scenario: Providing clean 9 V bias for ECG amplifier stages and optical pulse oximetry front-ends. IC Role / Device Role / Timing Role: Low-noise analog supply rail, isolated from noisy digital domains via dedicated LDO stage. Use Value: 70 µV/VO output noise meets IEC 60601-1 EMI requirements; SOA protection avoids failure during electrode disconnect events. |
Use Scenario: Regulating 9 V for thermal print head drivers and smart card readers in retail kiosks. IC Role / Device Role / Timing Role: Primary 9 V source powering pulsed high-current loads with fast transient response. Use Value: 2 V dropout allows operation from 12 V SMPS with margin; short-circuit limit protects against jammed print mechanisms. |
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 |
|---|---|---|---|
| LM7809CD2T | ±4% output tolerance; 0–125 °C operating range; RthJA = 62.5 °C/W (D²PAK) | Not qualified for automotive or extended-temp industrial use; higher output drift (–1.1 mV/°C) | Select when cost sensitivity outweighs temp range and accuracy requirements. |
| MC7809BD2TR4 | ±2% tolerance; –40 °C to +125 °C; RthJC = 3.5 °C/W; lower SVR (58 dB) | Slightly reduced ripple rejection; same thermal performance but different quiescent current profile (5–8 mA) | Choose if sourcing from ON Semiconductor preferred; verify noise specs for analog-sensitive designs. |
Compared with LM7809CD2T and MC7809BD2TR4, the L7809ABD2T-TR offers superior output accuracy and tighter thermal drift, making it optimal for precision analog rails where long-term stability and wide-temperature reliability are non-negotiable.
Availability
L7809ABD2T-TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical front-end modules, and point-of-sale terminals requiring stable component supply with full traceability and lifecycle continuity.
Supply support for L7809ABD2T-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 specializing in power management, microcontrollers, and automotive-grade analog ICs, with manufacturing and quality systems certified to ISO/TS 16949 and AEC-Q100.
The L78 series is ST's flagship family of three-terminal positive linear regulators, engineered for ruggedness in harsh environments-designed to replace legacy 78xx parts while delivering extended temperature range, tighter tolerances, and integrated protection.
FAQ
What is the minimum load current required for regulation?
The L7809ABD2T-TR requires a minimum load current of 5 mA to maintain regulation. Below this threshold, output voltage may rise beyond the specified 9 V ±2% window due to internal biasing constraints. Applications with intermittent or zero-load states must include a bleeder resistor or active load to ensure compliance.
Can this regulator be used with an input voltage below 11.5 V?
No-operation below 11.5 V violates the specified input range for guaranteed 9 V output accuracy and regulation. At VI < 11.5 V, dropout occurs: output collapses toward VI minus ~2 V, and line/load regulation specs no longer apply. For lower-input applications, consider a low-dropout (LDO) alternative.
Is a heat sink required for 1.5 A continuous output?
With the D²PAK package's RthJC = 3 °C/W and typical PCB copper pour (≥4 cm² 2-oz copper), no external heatsink is needed for 1.5 A at ambient ≤60 °C. However, at higher ambient temperatures or in enclosed enclosures, thermal simulation using RthJA = 62.5 °C/W is recommended to confirm junction temperature stays below 125 °C.
Does this part support adjustable output voltage configurations?
While primarily designed as a fixed 9 V regulator, the L7809ABD2T-TR can be adapted for adjustable output using external resistive feedback networks per ST's AN2817 application note-but doing so voids the ±2% factory trim guarantee and degrades line/load regulation. Fixed-voltage use is strongly recommended for production designs.
L7809ABD2T-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):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
L7809ABD2T-TR FAQ
1.How can I place an order for L7809ABD2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L7809ABD2T-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 L7809ABD2T-TR reliable?
The price and inventory of L7809ABD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7809ABD2T-TR is usually 5 days.
3.What payment methods are accepted for L7809ABD2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7809ABD2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7809ABD2T-TR?
L7809ABD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7809ABD2T-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 L7809ABD2T-TR?
For technical support, including L7809ABD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7809ABD2T-TR requirements.
6.How does Aetrix verify that L7809ABD2T-TR is sourced from the original manufacturer or authorized distributors?
All L7809ABD2T-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 L7809ABD2T-TR meets industry standards.
7.What is the process for return or replacement of L7809ABD2T-TR?
All L7809ABD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7809ABD2T-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 L7809ABD2T-TR part is unused and in its original packaging.
Return procedure for L7809ABD2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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