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Texas Instruments UA78L08ACDRG4
- Part No.:
- UA78L08ACDRG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA78L08ACDRG4.pdf
- Description:
- IC REG LINEAR 8V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
UA78L08ACDRG4 from Texas Instruments is a fixed-output +8 V positive-voltage linear regulator in an 8-pin SOIC package, delivering up to 100 mA output current with 1.7 V dropout voltage, 3.8 mA quiescent current, and stable operation without external capacitors-used for on-card regulation in motor drives and building automation systems.
For engineers reviewing the UA78L08ACDRG4 datasheet, UA78L08ACDRG4 pinout, UA78L08ACDRG4 application, or UA78L08ACDRG4 equivalent, this page provides verified electrical characteristics, thermal metrics, legacy-chip-specific operating conditions (0°C to +125°C), and design-meaningful comparisons against alternative fixed-output regulators.
Technical Context
The UA78L08ACDRG4 implements a legacy-chip architecture with internal current-limiting and thermal shutdown, requiring no external compensation components. Its input voltage range is 10.5 V to 23 V under recommended operating conditions, and it maintains output regulation across load currents from 1 mA to 100 mA at junction temperatures from 0°C to +125°C.
It features a 4.9 mm × 3.91 mm SOIC-8 package with four COMMON pins (pins 2, 3, 6, 7) tied to ground, one INPUT (pin 8), one OUTPUT (pin 1), and two NC pins (pins 4, 5). Ripple rejection is 36–46 dB at 120 Hz, and output noise is 54 µV RMS (10 Hz–100 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±0.64 V over temperature (0°C to +125°C) and load (1–70 mA) |
| Max Output Current | 100 mA - sufficient for low-power microcontrollers, sensors, and interface ICs |
| Dropout Voltage | 1.7 V at 25°C - enables operation with only 1.7 V headroom above output |
| Quiescent Current | 3.8–6.0 mA - defines minimum system power draw during light-load operation |
| Input Voltage Range | 10.5 V to 23 V - compatible with 12 V rail systems with margin for ripple and drop |
| Ripple Rejection | 36–46 dB at 120 Hz - suppresses AC line-derived noise on unregulated DC inputs |
| Thermal Resistance | RθJA = 115°C/W (SOIC-8) - requires minimal heatsinking for 100 mA at ambient ≤60°C |
Pinout & Package
UA78L08ACDRG4 uses an 8-pin SOIC (D package), 4.9 mm × 3.91 mm body size, with exposed pad not present. Pin functions are validated per TI SLVS010X Rev X (June 2023).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | OUTPUT | Main regulated +8 V output; connect 0.1 µF ceramic capacitor close to pin and GND for transient response |
| Pins 2, 3, 6, 7 | COMMON | Ground reference terminals; all must be connected to system GND for thermal and noise performance |
| Pin 4, Pin 5 | NC | No internal connection; tie to GND for improved thermal dissipation or leave floating |
| Pin 8 | INPUT | Unregulated DC input; place 0.33 µF capacitor between this pin and GND to suppress source impedance effects |
Key Features
| Feature | Design Value |
|---|---|
| Stable without external capacitors | Eliminates need for output stabilization capacitor, reducing BOM count and PCB area |
| Built-in short-circuit and thermal protection | Self-limits current and shuts down above safe junction temperature, enabling robust field operation |
| Fixed +8 V output with tight tolerance | ±0.64 V over full temperature/load range ensures reliable logic-level and analog supply compliance |
| Low quiescent current (3.8 mA typ) | Minimizes standby power loss in battery-backed or energy-sensitive applications |
| Legacy-chip temperature rating (0°C to +125°C) | Validated for industrial environments without extended cold-start requirements |
Applications
| Motor Drives | Building Automation |
|---|---|
Use Scenario: Powering gate drivers and position-sensing circuitry in BLDC motor control modules. IC Role / Device Role / Timing Role: Local +8 V bias supply for half-bridge drivers and Hall-effect sensors. Use Value: Stable regulation prevents driver misfiring during load transients; no external capacitor simplifies layout near noisy power stages. | Use Scenario: Supplying HVAC controllers, damper actuators, and occupancy sensor nodes. IC Role / Device Role / Timing Role: Primary 8 V rail for microcontroller I/O, relay coils, and analog front-ends. Use Value: Thermal shutdown protects against enclosure overheating; 100 mA supports multiple peripheral loads simultaneously. |
| Factory Automation | Flow Transmitters |
Use Scenario: Providing regulated power to PLC I/O modules and industrial Ethernet PHYs. IC Role / Device Role / Timing Role: On-board regulation for isolated digital signal conditioning circuits. Use Value: Input voltage regulation ≤150 mV ensures clean logic levels despite 24 V bus ripple; SOIC-8 eases automated assembly. | Use Scenario: Powering ultrasonic flow meter signal chains and 4–20 mA transmitter ICs. IC Role / Device Role / Timing Role: Precision +8 V reference for ADC bias and op-amp rails. Use Value: 54 µV output noise avoids degradation of µV-level sensor signals; 36–46 dB ripple rejection suppresses switching noise from nearby SMPS. |
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 |
|---|---|---|---|
| UA78L08ACD | Same SOIC-8 package and electrical specs; RG4 suffix indicates tape-and-reel packaging with green (RoHS-compliant) finish | No functional difference; identical thermal and electrical behavior in PCB layout | Select UA78L08ACDRG4 for volume production with automated pick-and-place; UA78L08ACD for prototyping or small-batch hand assembly |
| LM78L08ACM/NOPB | Same +8 V output, 100 mA rating, and SOIC-8 package but higher quiescent current (5.5 mA typ) and lower ripple rejection (30 dB) | Lacks thermal shutdown; requires external capacitor for stability in some layouts | Choose LM78L08ACM/NOPB only if legacy design reuse mandates pin compatibility without feature upgrades |
Compared with UA78L08ACD, UA78L08ACDRG4 offers identical performance in RoHS-compliant packaging; compared with LM78L08ACM/NOPB, it delivers superior noise immunity, built-in protection, and capacitor-free stability-justifying redesign where reliability and layout simplicity are critical.
Availability
UA78L08ACDRG4 is available at Aetrix Electronics and suitable for motor drives, building automation, and factory automation applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for UA78L08ACDRG4 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and industrial-grade ICs.
The UA78L series was designed for cost-sensitive, space-constrained on-card regulation in industrial and automation equipment-emphasizing simplicity, reliability, and wide-input-voltage tolerance without external compensation.
FAQ
What is the maximum input voltage for UA78L08ACDRG4?
The UA78L08ACDRG4 is rated for a maximum input voltage of 23 V under recommended operating conditions. This limit applies specifically to the legacy-chip version (as indicated by the "AC" suffix), and exceeds the 20 V typical for many +8 V regulators-enabling use with 24 V industrial rails including transient margins.
Does UA78L08ACDRG4 require external capacitors for stability?
No, UA78L08ACDRG4 is internally compensated and stable without external capacitors. However, TI recommends a 0.33 µF input capacitor and 0.1 µF output capacitor to improve transient response and suppress source impedance effects-especially important in motor drive and industrial environments with high di/dt noise.
What is the operating temperature range of UA78L08ACDRG4?
UA78L08ACDRG4 is characterized for an operating junction temperature range of 0°C to +125°C, consistent with the legacy-chip UA78L08AC specification. It is not rated for –40°C operation; for extended temperature applications, consider newer-series alternatives like TL750L08 or TPS7A16A.
How does UA78L08ACDRG4 handle overload or short-circuit conditions?
UA78L08ACDRG4 incorporates built-in short-circuit current limiting and thermal shutdown. Under overload, it reduces output current to a safe limit; if junction temperature exceeds ~150°C, it disables output until cooling occurs. These protections are fully integrated and require no external circuitry-enhancing system robustness in factory automation deployments.
What package type is used for UA78L08ACDRG4?
UA78L08ACDRG4 uses an 8-pin SOIC (Small Outline Integrated Circuit) package, designated D package by Texas Instruments, with dimensions 4.9 mm × 3.91 mm. The "RG4" suffix confirms green (lead-free, RoHS-compliant) finish and tape-and-reel packaging optimized for SMT assembly.
UA78L08ACDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.7V @ 40mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 46dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA78L08ACDRG4 FAQ
1.How can I place an order for UA78L08ACDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78L08ACDRG4 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 UA78L08ACDRG4 reliable?
The price and inventory of UA78L08ACDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78L08ACDRG4 is usually 5 days.
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Once your UA78L08ACDRG4 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 UA78L08ACDRG4?
For technical support, including UA78L08ACDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78L08ACDRG4 requirements.
6.How does Aetrix verify that UA78L08ACDRG4 is sourced from the original manufacturer or authorized distributors?
All UA78L08ACDRG4 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 UA78L08ACDRG4 meets industry standards.
7.What is the process for return or replacement of UA78L08ACDRG4?
All UA78L08ACDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UA78L08ACDRG4, 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 UA78L08ACDRG4 part is unused and in its original packaging.
Return procedure for UA78L08ACDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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