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Texas Instruments UA78L05ACDRM3
- Part No.:
- UA78L05ACDRM3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA78L05ACDRM3.pdf
- Description:
- 100-MA 30-VLINEAR VOLTAGE REGULA
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
UA78L05ACDRM3 from Texas Instruments is a fixed-output +5 V positive-voltage linear regulator delivering up to 100 mA output current, with input voltage range of 7 V to 20 V (recommended), dropout voltage of 1.7 V, quiescent current of 3.8 mA, and operating junction temperature range of –40°C to +125°C. It serves as a low-noise, stable local power supply for microcontroller peripherals, sensor interfaces, and industrial I/O modules.
For engineers reviewing the UA78L05ACDRM3 datasheet, UA78L05ACDRM3 pinout, UA78L05ACDRM3 application, or UA78L05ACDRM3 equivalent, this page provides verified electrical specs, thermal metrics, package dimensions, real-world use cases, and validated alternative parts - all confirmed for the M3-marked SOIC-8 variant of the UA78L05AC series.
Technical Context
The UA78L05ACDRM3 implements a classic series-pass transistor architecture with internal current limiting and thermal shutdown. Its regulation loop requires no external compensation capacitor, enabling stable operation across 1 mA–100 mA load current with only 0.33 µF input and 0.1 µF output ceramic capacitors.
It belongs to the "new chip" revision of the UA78L family, characterized for –40°C to +125°C operation and featuring improved input voltage regulation (≤33 mV), ripple rejection (48–55 dB), and bias current stability (±0.485 mA over full temperature range) compared to legacy variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.0 V ±2.5% (4.85–5.15 V) over –40°C to +125°C, ensuring reliable logic-level compliance for 5 V digital systems. |
| Max Output Current | 100 mA continuous - sufficient for powering multiple low-power ICs (e.g., op-amps, ADCs, UART transceivers) on a single board rail. |
| Input Voltage Range | 7 V to 20 V (recommended); absolute max 45 V - compatible with unregulated 9 V/12 V wall adapters and industrial 24 V bus derivatives. |
| Dropout Voltage | 1.7 V at 40 mA and 25°C - enables regulation from 6.7 V minimum input, supporting margin-critical 7 V supply designs. |
| Quiescent Current | 3.8 mA typical at 25°C - balances low-noise performance with standby power efficiency in always-on monitoring circuits. |
| Ripple Rejection | 48–55 dB at 120 Hz - suppresses AC line noise and switching regulator coupling, critical for analog signal chains and precision sensors. |
| Thermal Resistance | RθJA = 115°C/W (SOIC-8) - requires minimal copper area for thermal relief in compact industrial PCB layouts. |
Pinout & Package
UA78L05ACDRM3 is packaged in an 8-pin SOIC (D package), 4.9 mm × 6 mm footprint, with exposed pad not present. Pin 1 is OUTPUT; pins 2, 3, 6, 7 are COMMON (GND); pin 8 is INPUT; pins 4 and 5 are NC (no connect, recommended tied to GND for thermal improvement).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTPUT | Regulated +5 V output node; place 0.1 µF ceramic capacitor within 5 mm of this pin and GND for transient response. |
| 2, 3, 6, 7 | COMMON | Ground reference for internal pass element and error amplifier; all four pins must be connected to system GND plane. |
| 4, 5 | NC | No internal connection; tie to GND to improve thermal dissipation and reduce EMI susceptibility. |
| 8 | INPUT | Unregulated input supply; place 0.33 µF ceramic capacitor directly between this pin and GND to suppress source impedance effects. |
Key Features
| Feature | Design Value |
|---|---|
| Stable without external capacitor | Eliminates need for output compensation network - reduces BOM count and layout sensitivity in space-constrained designs. |
| Built-in short-circuit & thermal protection | Self-limiting current and automatic shutdown prevent damage during fault conditions, enabling robust deployment in inaccessible equipment. |
| –40°C to +125°C operation | Validated for extended temperature environments including factory automation enclosures and outdoor building control nodes. |
| Low output noise (42 µV RMS) | Minimizes interference in analog front-ends (e.g., RTD amplifiers, flow meter signal conditioning) without additional filtering. |
| SOIC-8 package with multiple GND pins | Enhanced thermal conduction and reduced ground impedance improve PSRR and long-term reliability under sustained 100 mA loads. |
Applications
| Industrial Sensor Node | Motor Drive Control Logic |
|---|---|
Use Scenario: Powering 3.3 V MCU, analog front-end, and RS-485 transceiver from a 12 V DC bus in a DIN-rail mounted flow transmitter. IC Role / Device Role / Timing Role: Local +5 V regulator supplying clean bias to op-amps and ADC reference buffers. Use Value: 42 µV RMS noise and 48 dB ripple rejection preserve 12-bit measurement accuracy despite noisy motor drive proximity. |
Use Scenario: Providing isolated +5 V rail for gate driver logic and position encoder interface in a 24 V brushless motor controller. IC Role / Device Role / Timing Role: Dedicated low-dropout regulator for timing-critical PWM generation circuitry. Use Value: 1.7 V dropout ensures stable 5 V output even when 24 V bus sags to 7 V during high-current commutation events. |
| Building Automation Panel | Factory I/O Module |
Use Scenario: Regulating +5 V for touch controller, LED drivers, and environmental sensor array in a wall-mounted HVAC interface. IC Role / Device Role / Timing Role: Primary fixed-voltage LDO for mixed-signal subsystem requiring wide-temp reliability. Use Value: –40°C to +125°C rating guarantees operation in unheated mechanical rooms and sun-exposed exterior enclosures. |
Use Scenario: Supplying +5 V to optocoupler inputs, status LEDs, and diagnostic UART in a modular PLC I/O card. IC Role / Device Role / Timing Role: On-card regulation replacing centralized 5 V distribution to reduce noise coupling. Use Value: Four GND pins and SOIC-8 layout minimize ground bounce during simultaneous digital output switching. |
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 |
|---|---|---|---|
| LM78L05ACZ/LFT1 | TO-92 package, 0°C to +125°C rating, higher quiescent current (5.5 mA), lower ripple rejection (40 dB). | Limited to ambient-temperature industrial panels; unsuitable for cold-storage or outdoor deployments. | Select when cost and through-hole assembly outweigh thermal and temp-range requirements. |
| TLV70550DBVR | SOT-23-5, 200 mA output, 17 µA IQ, 170 mV dropout, but requires external output capacitor and lacks thermal shutdown. | Optimized for ultra-low-power battery systems; lacks fault protection needed in mains-powered equipment. | Choose only for portable, low-IQ designs where external cap placement and absence of thermal cutoff are acceptable. |
Compared with LM78L05ACZ/LFT1, UA78L05ACDRM3 delivers wider temperature operation and better noise immunity; versus TLV70550DBVR, it trades ultra-low IQ for integrated protection and capacitor-free stability - making it the preferred choice for ruggedized 5 V rail generation in industrial control hardware.
Availability
UA78L05ACDRM3 is available at Aetrix Electronics and suitable for motor drives, building automation systems, and factory I/O modules requiring stable component supply, long-lifecycle support, and guaranteed SOIC-8 packaging consistency.
Supply support for UA78L05ACDRM3 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management IC design.
The UA78L series was developed for cost-sensitive, high-reliability on-card regulation in industrial and automation systems - prioritizing simplicity, thermal robustness, and wide-temperature operation over ultra-low IQ or ultra-low dropout.
FAQ
What is the maximum input voltage for UA78L05ACDRM3?
The absolute maximum input voltage for UA78L05ACDRM3 is 45 V, per the "new chip" specification. However, the recommended operating range is 7 V to 20 V to ensure optimal regulation accuracy, thermal performance, and ripple rejection. Exceeding 20 V increases power dissipation and degrades long-term reliability without functional benefit.
Does UA78L05ACDRM3 require external capacitors for stability?
No - UA78L05ACDRM3 is internally compensated and stable without external capacitors. However, TI recommends a 0.33 µF ceramic input capacitor and 0.1 µF ceramic output capacitor to improve transient response and suppress source impedance effects. These values are not for stability but for system-level noise and load-step performance.
Is UA78L05ACDRM3 pin-compatible with older UA78L05C variants?
Yes - UA78L05ACDRM3 uses the same SOIC-8 (D) package and identical pinout as UA78L05CDR and UA78L05ACDR. All share pins 1 (OUT), 2/3/6/7 (GND), 4/5 (NC), and 8 (IN). The "M3" suffix denotes production status per TI's SLVS010X revision X, not a pinout change.
What is the thermal resistance (RθJA) of UA78L05ACDRM3?
UA78L05ACDRM3 has a junction-to-ambient thermal resistance (RθJA) of 115°C/W in the SOIC-8 package, measured on a standard 2-layer JEDEC test board. This value assumes no additional copper pour; adding 1 in² of 2-oz copper connected to all GND pins reduces effective RθJA by ~30°C/W in typical industrial PCB layouts.
Can UA78L05ACDRM3 be used in automotive applications?
UA78L05ACDRM3 is not AEC-Q100 qualified and lacks automotive-grade screening or extended temperature validation beyond –40°C to +125°C. While its temperature range overlaps with some automotive cabin applications, TI does not recommend or guarantee its use in automotive systems due to missing qualification testing for vibration, ESD, and lifetime reliability under automotive stress profiles.
UA78L05ACDRM3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- UA78L
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 1.7V @ 40mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 55dB ~ 49dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Current, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA78L05ACDRM3 FAQ
1.How can I place an order for UA78L05ACDRM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78L05ACDRM3 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 UA78L05ACDRM3 reliable?
The price and inventory of UA78L05ACDRM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78L05ACDRM3 is usually 5 days.
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4.How is shipping managed for UA78L05ACDRM3?
UA78L05ACDRM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78L05ACDRM3 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 UA78L05ACDRM3?
For technical support, including UA78L05ACDRM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78L05ACDRM3 requirements.
6.How does Aetrix verify that UA78L05ACDRM3 is sourced from the original manufacturer or authorized distributors?
All UA78L05ACDRM3 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 UA78L05ACDRM3 meets industry standards.
7.What is the process for return or replacement of UA78L05ACDRM3?
All UA78L05ACDRM3 units undergo pre-shipment inspection (PSI). If there is an issue with UA78L05ACDRM3, 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 UA78L05ACDRM3 part is unused and in its original packaging.
Return procedure for UA78L05ACDRM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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