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Texas Instruments UA78L02ACDG4
- Part No.:
- UA78L02ACDG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA78L02ACDG4.pdf
- Description:
- IC REG LINEAR 2.6V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,351
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Product details
Overview
UA78L02ACDG4 from Texas Instruments is a legacy 2.6 V fixed-output positive-voltage linear regulator in SOIC-8 package, delivering up to 100 mA output current with 3.8 mA quiescent current, 1.7 V dropout voltage, and ±0.1 V output regulation over 0°C to +125°C junction temperature - used for low-noise local regulation in motor drive control logic.
For engineers reviewing the UA78L02ACDG4 datasheet, UA78L02ACDG4 pinout, UA78L02ACDG4 application, or UA78L02ACDG4 equivalent, this page provides verified electrical specs, thermal metrics, SOIC-8 terminal mapping, and validated alternative parts for industrial embedded power rail design.
Technical Context
The UA78L02ACDG4 implements a classic series-pass transistor architecture with internal current limiting and thermal shutdown. It operates without external compensation capacitors and maintains stability across 1 mA–100 mA load range using only 0.33 µF input and 0.1 µF output ceramic capacitors.
Designed for legacy industrial applications, it supports input voltages from 4.75 V to 30 V (absolute max), delivers 2.6 V ±0.1 V at 40 mA over 0°C–125°C, and achieves 43–51 dB ripple rejection at 120 Hz - optimized for noise-sensitive analog and digital subsystems requiring clean, localized 2.6 V bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 2.6 V ±0.1 V at 40 mA, 0°C to +125°C - ensures stable logic-level supply for 2.5 V–2.7 V interface ICs |
| Max output current | 100 mA - sufficient for powering microcontroller peripherals, sensors, or small logic blocks |
| Dropout voltage | 1.7 V at 25°C - enables operation from 4.75 V input while maintaining regulation down to 2.6 V output |
| Quiescent current | 3.6–6 mA - low standby draw suitable for always-on industrial monitoring circuits |
| Ripple rejection | 43–51 dB at 120 Hz - suppresses AC line-derived noise in transformer-fed supplies |
| Thermal resistance | RθJA = 115°C/W (SOIC-8) - requires minimal heatsinking for ≤100 mA continuous operation at TA ≤ 70°C |
| Operating temperature | 0°C to +125°C junction - qualified for under-hood or enclosed industrial enclosure use |
Pinout & Package
UA78L02ACDG4 is housed in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed pad not electrically connected. 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 2.6 V output node - place 0.1 µF ceramic capacitor within 5 mm of this and COMMON pins |
| 2, 3, 6, 7 | COMMON | Ground reference for internal pass element and error amplifier - low-inductance GND plane connection required |
| 8 | INPUT | Unregulated DC input (4.75–30 V) - place 0.33 µF ceramic capacitor directly between this and COMMON |
| 4, 5 | NC | No internal connection - tie to GND to improve thermal dissipation; floating acceptable but suboptimal |
Key Features
| Feature | Design Value |
|---|---|
| Stable without external components | Operates with only 0.33 µF input and 0.1 µF output ceramics - eliminates BOM cost and layout area for compensation networks |
| Internal short-circuit protection | Current-limited output prevents damage during accidental output-to-GND faults - no external foldback circuit needed |
| Thermal shutdown | Auto-shutdown at ~150°C junction temperature - protects device and PCB during sustained overload or poor airflow |
| Low output noise | 30 µV RMS (10 Hz–100 kHz) - minimizes interference in precision ADC references or RF front-end bias rails |
| Wide input range | 4.75 V to 30 V operation - accommodates 5 V, 9 V, 12 V, and 24 V industrial bus inputs with margin |
Applications
| Motor Drive Control | Industrial Flow Transmitter |
|---|---|
Use Scenario: Powering gate driver bias, encoder interface logic, and current-sense amplifier in 24 V brushless motor drives. IC Role / Device Role / Timing Role: Local 2.6 V regulator supplying isolated logic-level signals and analog front-end circuitry. Use Value: Eliminates noise coupling from high-current motor switching into sensitive feedback paths via dedicated low-noise rail. |
Use Scenario: Providing stable excitation voltage and signal conditioning power in 4–20 mA loop-powered flow meters. IC Role / Device Role / Timing Role: Fixed 2.6 V supply for bridge sensor excitation and op-amp signal chain in ultra-low-power transmitters. Use Value: Enables accurate 0.1% full-scale measurement by rejecting supply ripple that would otherwise modulate sensor output. |
| Building Automation Panel | Factory Control I/O Module |
Use Scenario: Regulating power for microcontroller peripherals, LED indicators, and RS-485 transceivers in HVAC control panels. IC Role / Device Role / Timing Role: On-board 2.6 V LDO for mixed-signal MCU subsystems operating from shared 5 V or 12 V backplane. Use Value: Prevents cross-talk between digital switching noise and analog sensor inputs sharing same supply domain. |
Use Scenario: Supplying programmable logic controller (PLC) digital I/O channel isolators and level translators. IC Role / Device Role / Timing Role: Dedicated 2.6 V rail for optocoupler LED drivers and low-voltage logic buffers in DIN-rail mounted modules. Use Value: Ensures consistent LED forward voltage and timing margins across temperature, improving isolation reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM78L02ACM/NOPB | Same 2.6 V output, 100 mA rating, and SOIC-8 package; higher quiescent current (5.5 mA typ) and lower ripple rejection (38 dB) | Limited to 0°C–70°C ambient (vs. UA78L02ACDG4's 125°C junction rating) | Acceptable for commercial-temperature board-level regulation where thermal headroom is ample |
| TLV70026DCKR | 2.6 V, 200 mA, SOT-23-5; much lower dropout (0.175 V), lower IQ (30 µA), but requires external output capacitor | Not drop-in: different pinout, no NC pins, needs 2.2 µF output cap - unsuitable for legacy footprint replacement | Preferred for new designs prioritizing efficiency and battery life, but requires PCB redesign |
Compared with LM78L02ACM/NOPB, UA78L02ACDG4 offers superior thermal robustness and ripple suppression; compared with TLV70026DCKR, it trades higher IQ and dropout for zero-compensation simplicity and direct SOIC-8 drop-in capability in existing industrial layouts.
Availability
UA78L02ACDG4 is available at Aetrix Electronics and suitable for motor drives, building automation systems, and factory control I/O modules requiring stable component supply with long-term industrial lifecycle support.
Supply support for UA78L02ACDG4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The UA78L series was designed for cost-sensitive, noise-immune local regulation in industrial control and instrumentation - emphasizing ruggedness, capacitor-free stability, and wide-input-range operation.
FAQ
What is the maximum input voltage for UA78L02ACDG4?
The absolute maximum input voltage for UA78L02ACDG4 is 30 V, per its legacy chip specification. Operation above 30 V risks permanent damage. For reliable long-term use, TI recommends staying within 4.75 V to 20 V as specified in Recommended Operating Conditions - this ensures proper dropout margin and thermal performance across the full 0°C to +125°C junction temperature range of the UA78L02ACDG4.
Does UA78L02ACDG4 require external capacitors for stability?
No, UA78L02ACDG4 is internally compensated and stable without external capacitors. However, TI strongly recommends a 0.33 µF ceramic capacitor at the INPUT pin and a 0.1 µF ceramic capacitor at the OUTPUT pin to suppress source impedance effects and improve transient response. These values are validated in the UA78L02ACDG4 datasheet and critical for preventing oscillation under load steps or high-source-impedance conditions.
What is the output voltage tolerance of UA78L02ACDG4 over temperature?
UA78L02ACDG4 delivers 2.6 V with ±0.1 V tolerance (i.e., 2.5 V to 2.7 V) at 25°C, and ±0.15 V (2.45 V to 2.75 V) across its full 0°C to +125°C junction temperature range. This specification is confirmed in Section 6.5 of the SLVS010X datasheet and applies specifically to the UA78L02ACDG4 variant - not the broader UA78L02 family.
Can UA78L02ACDG4 be used in automotive applications?
UA78L02ACDG4 is not AEC-Q100 qualified and is rated only for 0°C to +125°C junction temperature - insufficient for under-hood automotive environments requiring –40°C startup. While it may function in cabin-mounted infotainment or body-control modules with controlled ambient, TI does not specify or guarantee automotive-grade reliability, ESD immunity (HBM = 1000 V), or lifetime performance for UA78L02ACDG4 in automotive use cases.
How does the thermal performance of UA78L02ACDG4 compare in SOIC-8 versus other packages?
In SOIC-8 (D package), UA78L02ACDG4 has RθJA = 115°C/W - significantly better than TO-92 (143.6°C/W) but worse than SOT-89 (54.7°C/W). At 100 mA and 20 V input, power dissipation is ~1.7 W, resulting in ~196°C rise above ambient in SOIC-8 - exceeding safe limits. Therefore, derating to ≤60 mA or adding copper pour is essential. The SOT-89 variant offers superior thermal performance but differs in pinout and footprint.
UA78L02ACDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.7V @ 40mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 51dB (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
UA78L02ACDG4 FAQ
1.How can I place an order for UA78L02ACDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78L02ACDG4 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 UA78L02ACDG4 reliable?
The price and inventory of UA78L02ACDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78L02ACDG4 is usually 5 days.
3.What payment methods are accepted for UA78L02ACDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA78L02ACDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA78L02ACDG4?
UA78L02ACDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78L02ACDG4 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 UA78L02ACDG4?
For technical support, including UA78L02ACDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78L02ACDG4 requirements.
6.How does Aetrix verify that UA78L02ACDG4 is sourced from the original manufacturer or authorized distributors?
All UA78L02ACDG4 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 UA78L02ACDG4 meets industry standards.
7.What is the process for return or replacement of UA78L02ACDG4?
All UA78L02ACDG4 units undergo pre-shipment inspection (PSI). If there is an issue with UA78L02ACDG4, 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 UA78L02ACDG4 part is unused and in its original packaging.
Return procedure for UA78L02ACDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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