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STMicroelectronics L78M08ACDT-TR
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- Part No.:
- L78M08ACDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
L78M08ACDT-TR.pdf
- Description:
- IC REG LINEAR 8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,902
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Product details
Overview
L78M08ACDT-TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a precise 8 V output at up to 500 mA, featuring ±2 % output voltage tolerance, thermal overload protection, and short-circuit current limiting. It operates across an extended 0 °C to 125 °C junction temperature range and uses a DPAK (TO-252) surface-mount package for compact power management in industrial control modules.
For engineers reviewing the L78M08ACDT-TR datasheet, L78M08ACDT-TR pinout, L78M08ACDT-TR application, or L78M08ACDT-TR equivalent, key selection criteria include dropout voltage (2 V), load regulation (80 mV over 5–200 mA), supply voltage rejection (56 dB at 120 Hz), quiescent current (6 mA), and SOA protection for robust local regulation in space-constrained embedded systems.
Technical Context
This device implements a monolithic series pass transistor with internal current limiting, thermal shutdown, and safe-area compensation-ensuring fault resilience without external components. Its fixed 8 V output is trimmed during production to ±2 % accuracy at 25 °C and maintains stability over IO = 5–350 mA and VI = 10.5–23 V.
The regulator requires minimal external capacitance: 0.33 µF input and 0.1 µF output ceramic or tantalum capacitors suffice for stability. It exhibits 52 µV RMS output noise (10 Hz–100 kHz) and −0.5 mV/°C output voltage drift under light load (IO = 5 mA), supporting precision analog subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8 V ±2 % at 25 °C; maintains 7.7–8.3 V across 5–350 mA load and 10.5–23 V input |
| Max Output Current | 500 mA continuous; internally limited with thermal foldback above 125 °C junction temperature |
| Dropout Voltage | 2 V at 25 °C; defines minimum VI–VO differential required for regulation (e.g., VI ≥ 10 V for stable 8 V out) |
| Supply Rejection | 56 dB at 120 Hz; suppresses ripple from unregulated DC sources like rectified AC or switching pre-regulators |
| Load Regulation | 80 mV over 5–200 mA at 25 °C; ensures <1 % output deviation across typical operating loads |
| Quiescent Current | 6 mA at 25 °C; remains stable (<0.8 mA variation) across input voltage and load changes |
| Operating Temp Range | 0 °C to 125 °C junction temperature; validated for industrial-grade reliability without derating |
Pinout & Package
The L78M08ACDT-TR is housed in a DPAK (TO-252-3) thermally enhanced surface-mount package with exposed drain pad for PCB heat sinking. Package dimensions comply with ST's STD-ST mechanical specification (A = 2.20–2.40 mm, D = 6.00–6.20 mm, E = 6.40–6.60 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Voltage input terminal | Accepts unregulated DC input (10.5–23 V); requires 0.33 µF bypass capacitor placed adjacent to pin |
| 2 (Ground) | Circuit common reference | Low-impedance return path for load and regulator bias; must connect directly to power plane with minimal trace inductance |
| 3 (Output) | Regulated voltage output | Delivers stable 8 V to load; 0.1 µF output capacitor required for transient response and loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Overload Protection | Automatic shutdown at TJ ≥ 160 °C with hysteresis; resumes operation after cooldown-eliminates need for external thermal sensors |
| Short-Circuit Current Limiting | 250 mA typical short-circuit current (Isc); prevents destructive failure during output faults without external fusing |
| SOA Protection | Safe operating area compensation reduces peak short-circuit current as VCE increases-enables reliable operation under high-VI–VO differentials |
| Precision Output Tolerance | ±2 % over full temperature and load range; tighter than legacy 78xx series (±4 %), reducing need for post-regulation trimming |
| Low Noise Performance | 52 µV RMS output noise (10 Hz–100 kHz); suitable for powering ADC references and op-amp signal chains without added filtering |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated digital input buffers and analog sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local 8 V rail generator for 24 V field-side signal conditioning circuitry. Use Value: ±2 % tolerance ensures consistent logic threshold margins across temperature; thermal shutdown prevents latch-up during ambient spikes to 70 °C. |
Use Scenario: Supplying microcontroller peripherals (CAN transceivers, LIN drivers) in non-safety-critical body electronics. IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (12 V nominal) via pre-regulator. Use Value: 2 V dropout enables operation down to 10 V battery voltage during cranking; SOA protection withstands load dump transients. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
|
Use Scenario: Providing clean 8 V bias to low-noise instrumentation amplifiers measuring biopotentials. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital domains. Use Value: 52 µV RMS noise avoids signal degradation in 16-bit ADC front-ends; 56 dB SVR suppresses switching noise from nearby DC/DC converters. |
Use Scenario: Regulating auxiliary rails for display backlight drivers and USB peripheral ports in retail kiosks. IC Role / Device Role / Timing Role: Compact, cost-effective fixed-voltage source replacing discrete LDO solutions. Use Value: DPAK package enables high-current density layout on 2-layer PCBs; 500 mA rating supports simultaneous USB charging and LCD bias. |
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 |
|---|---|---|---|
| LM2931T-8.0/NOPB | Lower max current (100 mA), higher dropout (0.6 V typ.), wider temp range (−40 to +125 °C) | Suitable only for ultra-low-power microcontroller peripherals-not for 500 mA loads | Select only when input voltage margin is tight (<1 V headroom) and load current ≤100 mA |
| TL78L08ACDR | Lower current (100 mA), SO-8 package, no thermal shutdown, ±5 % tolerance | Lacks fault protection and precision; requires external thermal design oversight | Use only in cost-sensitive, non-critical consumer applications where 8 V accuracy and robustness are secondary |
Compared with LM2931T-8.0/NOPB and TL78L08ACDR, the L78M08ACDT-TR delivers 5× higher output current, integrated thermal/short-circuit protection, and twice the output voltage accuracy-making it the sole choice for industrial and medical applications demanding reliability at 500 mA.
Availability
L78M08ACDT-TR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical patient monitor front-ends, and point-of-sale terminal power management requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for L78M08ACDT-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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.
The L78MxxAC series belongs to ST's precision linear regulator product line, engineered specifically for industrial and medical applications requiring guaranteed performance across 0–125 °C junction temperatures and robust fault protection without external components.
FAQ
What is the minimum input voltage required for stable 8 V output?
The L78M08ACDT-TR requires a minimum input-to-output differential of 2 V (dropout voltage) at 25 °C. For stable 8 V regulation, VI must be ≥10 V under nominal load. At elevated temperatures or maximum load, design margin should increase to ≥10.5 V to accommodate worst-case dropout drift.
Can this regulator be used with ceramic output capacitors?
Yes-0.1 µF ceramic capacitors meet the stability requirements per ST's test circuits. However, ensure ESR is ≥10 mΩ to avoid potential oscillation; X7R or X5R dielectrics are recommended. Avoid ultra-low-ESR types (e.g., C0G) without verifying phase margin in the target layout.
Does the DPAK package require a heatsink for 500 mA operation?
At 500 mA with VI = 12 V (4 V drop), power dissipation is ~2 W. With RthJA = 100 °C/W (DPAK, standard PCB), junction temperature rise would exceed 125 °C. A 25 mm² copper pour (2 oz) reduces RthJA to ~60 °C/W, enabling full 500 mA at 25 °C ambient-no external heatsink needed if PCB thermal design is optimized.
How does the short-circuit protection behave under sustained fault conditions?
Under output short, the device limits current to ~250 mA (typ.) and activates thermal shutdown if junction temperature exceeds ~160 °C. After cooling below ~140 °C, it automatically recovers. This hiccup-mode behavior prevents permanent damage and eliminates need for fuse replacement in field-deployed equipment.
L78M08ACDT-TR 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:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 56dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
L78M08ACDT-TR FAQ
1.How can I place an order for L78M08ACDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L78M08ACDT-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 L78M08ACDT-TR reliable?
The price and inventory of L78M08ACDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78M08ACDT-TR is usually 5 days.
3.What payment methods are accepted for L78M08ACDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78M08ACDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L78M08ACDT-TR?
L78M08ACDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L78M08ACDT-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 L78M08ACDT-TR?
For technical support, including L78M08ACDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78M08ACDT-TR requirements.
6.How does Aetrix verify that L78M08ACDT-TR is sourced from the original manufacturer or authorized distributors?
All L78M08ACDT-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 L78M08ACDT-TR meets industry standards.
7.What is the process for return or replacement of L78M08ACDT-TR?
All L78M08ACDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with L78M08ACDT-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 L78M08ACDT-TR part is unused and in its original packaging.
Return procedure for L78M08ACDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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