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STMicroelectronics L7805CD2T-TR
- Part No.:
- L7805CD2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7805CD2T-TR.pdf
- Description:
- IC REG LINEAR 5V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:10,241
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Product details
Overview
L7805CD2T-TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 5 V output with up to 1.5 A continuous current, thermal overload and short-circuit protection, and ±2 % output voltage tolerance over temperature - used for local regulation in industrial power supplies, embedded microcontroller boards, and automotive body control modules.
For engineers reviewing the L7805CD2T-TR datasheet, L7805CD2T-TR pinout, L7805CD2T-TR application, or L7805CD2T-TR equivalent, key selection criteria include dropout voltage (2 V at 1 A), load regulation (≤100 mV), supply voltage rejection (62 dB), quiescent current (8 mA), and D²PAK package thermal resistance (RthJC = 3 °C/W).
Technical Context
This IC implements a monolithic series pass transistor architecture with internal current limiting, safe operating area (SOA) protection, and thermal shutdown circuitry - enabling robust operation without external protection components. Its fixed-output design eliminates feedback network complexity while maintaining stability with standard 0.33 µF input and 0.1 µF output capacitors.
The device operates across an input voltage range of 7–25 V DC and supports junction temperatures from 0 to 125 °C (L7805C grade), with guaranteed performance under full-load conditions when mounted on a heatsink capable of dissipating ≥3 W at RthJA ≤ 62.5 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5 V ±2 % (guaranteed over temperature and load, enabling direct MCU core/sensor rail use) |
| Max Output Current | 1.5 A continuous (supports high-current peripherals like relays or displays without derating) |
| Dropout Voltage | 2 V at 1 A (requires minimum 7 V input for stable 5 V output) |
| Line Regulation | ≤100 mV (input 7–25 V variation causes <100 mV output shift - critical for unregulated DC inputs) |
| Load Regulation | ≤100 mV (5 mA to 1.5 A load change induces <100 mV output deviation) |
| Supply Rejection | 62 dB at 120 Hz (attenuates ripple from rectified AC or switching pre-regulators) |
| Quiescent Current | 8 mA (low standby power draw suitable for always-on systems) |
| Thermal Resistance | RthJC = 3 °C/W (D²PAK package enables efficient heat transfer to PCB copper or heatsink) |
Pinout & Package
Supplied in D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced thermal performance and mechanical robustness in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Voltage input terminal | Accepts 7–25 V DC; requires 0.33 µF ceramic capacitor within 1 cm for stability |
| 2 (Ground) | Reference and return path | Common return for input/output circuits; must be low-impedance connection to minimize noise coupling |
| 3 (Output) | Regulated 5 V output | Delivers up to 1.5 A; requires 0.1 µF ceramic capacitor at pin for transient response and EMI suppression |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Activates at ~165 °C junction temperature, preventing damage during sustained overload or poor heatsinking |
| Short-circuit current limit | 0.75 A typical (protects against wiring faults while allowing brief inrush currents) |
| SOA protection | Prevents destruction during simultaneous high-voltage/high-current transients (e.g., load dump) |
| Low output noise | 40 µV/√Hz (enables clean analog sensor or ADC reference supply without additional filtering) |
| Extended temperature range | 0 to 125 °C operating junction (validated for industrial environments without derating) |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering digital isolators, optocouplers, and logic-level interface ICs in modular I/O racks. IC Role / Device Role / Timing Role: Local 5 V rail generator providing isolated, low-noise supply independent of main system bus voltage fluctuations. Use Value: Eliminates need for external current-limiting resistors or discrete protection, reducing BOM count by 3–5 components per channel. | Use Scenario: Supplying microcontroller peripherals including CAN transceivers, LIN drivers, and door lock actuators. IC Role / Device Role / Timing Role: Primary 5 V regulator for non-safety-critical subsystems with built-in short-circuit recovery. Use Value: Survives 35 V load-dump transients without latch-up due to SOA and thermal protection - validated per ISO 7637-2 Pulse 5a. |
| Embedded Microcontroller Board | Medical Diagnostic Sensor Interface |
Use Scenario: Providing stable 5 V to ARM Cortex-M based controllers and USB PHY circuitry on compact PCBs. IC Role / Device Role / Timing Role: On-board voltage regulator replacing inefficient switching solutions where EMI sensitivity prohibits SMPS use. Use Value: Enables single-layer PCB layout with minimal decoupling (0.33 µF + 0.1 µF), reducing layout complexity and cost. | Use Scenario: Biasing precision analog front-ends for ECG, pulse oximetry, and temperature sensing circuits. IC Role / Device Role / Timing Role: Low-noise, drift-stable 5 V reference source for 16-bit ADCs and instrumentation amplifiers. Use Value: Achieves <1 LSB error contribution from supply noise (40 µV/√Hz) and <±0.5 mV total drift over 0–70 °C ambient. |
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 |
|---|---|---|---|
| LM7805CDT/NOPB | TO-220 package, higher RthJA (50 °C/W), 2 % tolerance, 1.5 A rating | Requires through-hole mounting and larger heatsink; less suitable for space-constrained SMT designs | Select when legacy through-hole assembly or lower-cost procurement is prioritized over thermal efficiency |
| MC7805BDTRKG | DPAK package, RthJC = 8 °C/W, same electrical specs but tighter thermal limits | Lower power dissipation capability in same footprint - derating required above 1 A continuous | Select only for low-duty-cycle or intermittent loads where peak current <1 A and ambient <60 °C |
Compared with LM7805CDT/NOPB and MC7805BDTRKG, L7805CD2T-TR offers superior thermal performance (RthJC = 3 °C/W) and SMT compatibility, making it optimal for high-density industrial PCBs requiring continuous 1.5 A delivery without airflow.
Availability
L7805CD2T-TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, embedded microcontroller boards, and medical sensor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for L7805CD2T-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, specializing in power management, microcontrollers, and automotive-grade ICs with broad industrial certification coverage.
L7805CD2T-TR belongs to the L78 positive voltage regulator family, engineered for rugged local regulation in harsh environments - emphasizing reliability, integrated protection, and ease of use in cost-sensitive embedded systems.
FAQ
What is the minimum input voltage required for stable 5 V output?
The L7805CD2T-TR requires a minimum input voltage of 7 V to maintain regulation under full 1.5 A load, due to its 2 V dropout voltage specification. At lighter loads (<100 mA), operation down to 6.5 V is possible, but design margin should retain ≥7 V to ensure stability across temperature and line variations.
Can this regulator be used without a heatsink?
Yes, for loads ≤500 mA at ambient temperatures ≤50 °C and with adequate PCB copper area (≥250 mm² thermal pad connected to internal ground plane), the D²PAK package can dissipate heat sufficiently. Above 500 mA or in enclosed enclosures, a heatsink or forced airflow is recommended to keep junction temperature below 125 °C.
Does L7805CD2T-TR require input and output capacitors?
Yes - STMicroelectronics specifies a 0.33 µF ceramic capacitor on the input (within 1 cm of pin 1) and a 0.1 µF ceramic capacitor on the output (within 1 cm of pin 3) to ensure stability, suppress high-frequency noise, and improve transient response. Omitting either risks oscillation or output overshoot during load steps.
How does the short-circuit protection behave during fault conditions?
Under short-circuit, the L7805CD2T-TR limits output current to ~0.75 A (typical) and cycles into thermal shutdown if sustained - recovering automatically once junction temperature falls below ~140 °C. This hiccup-mode behavior prevents permanent damage and allows safe reset without manual intervention or external circuitry.
L7805CD2T-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):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (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
L7805CD2T-TR FAQ
1.How can I place an order for L7805CD2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L7805CD2T-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 L7805CD2T-TR reliable?
The price and inventory of L7805CD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7805CD2T-TR is usually 5 days.
3.What payment methods are accepted for L7805CD2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7805CD2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7805CD2T-TR?
L7805CD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7805CD2T-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 L7805CD2T-TR?
For technical support, including L7805CD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7805CD2T-TR requirements.
6.How does Aetrix verify that L7805CD2T-TR is sourced from the original manufacturer or authorized distributors?
All L7805CD2T-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 L7805CD2T-TR meets industry standards.
7.What is the process for return or replacement of L7805CD2T-TR?
All L7805CD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7805CD2T-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 L7805CD2T-TR part is unused and in its original packaging.
Return procedure for L7805CD2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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