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Texas Instruments UA723CNE4
- Part No.:
- UA723CNE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
UA723CNE4.pdf
- Description:
- 150-MA, 40-V, ADJUSTABLE LINEAR
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
UA723CNE4 from Texas Instruments is a precision voltage regulator IC featuring an internal 150-mA series pass transistor, adjustable output (2 V to 37 V), input voltage support up to 40 V, adjustable current limiting, and high ripple rejection (86 dB with 5 µF reference bypass). It operates from 0°C to 70°C and serves as a direct replacement for Fairchild µA723C in linear power supply designs.
For engineers reviewing the UA723CNE4 datasheet, UA723CNE4 pinout, UA723CNE4 application, or UA723CNE4 equivalent, this page delivers verified specifications, functional context, package-validated pin roles, real-world use cases, and two confirmed alternative parts - all grounded in TI's SLVS057D datasheet and official packaging documentation.
Technical Context
The UA723CNE4 integrates a temperature-compensated 7.15-V reference amplifier, error amplifier, frequency compensation network, and current-sense circuitry enabling foldback or constant-current limiting. Its architecture supports positive, negative, floating, shunt, and switching regulator topologies without external pass transistors up to 150 mA.
It accepts differential input voltages up to ±5 V at the error amplifier, tolerates 40 V continuous VCC+–VCC− differential, and maintains stable regulation across 9.5–40 V input range while delivering output noise as low as 2.5 µV (100 Hz–10 kHz, 5 µF CREF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 2 V to 37 V - externally adjustable via resistor divider; enables single-part support for diverse rail requirements. |
| Max Output Current | 150 mA - internal pass transistor eliminates need for external transistor in low-power applications. |
| Input Voltage Range | 9.5 V to 40 V - supports wide-input industrial and legacy power systems without pre-regulation. |
| Ripple Rejection | 86 dB @ 50 Hz–10 kHz with 5 µF CREF - suppresses AC line noise effectively in sensitive analog or mixed-signal supplies. |
| Reference Voltage | 7.15 V (typ) - stable, temperature-compensated bandgap-derived reference enabling precise output setting. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for office equipment, test instrumentation, and non-automotive embedded systems. |
| Standby Current | 2.3 mA (typ) at VI = 30 V - low quiescent draw improves efficiency in battery-backed or standby-critical designs. |
Pinout & Package
UA723CNE4 is supplied in a 14-pin plastic dual in-line package (PDIP-N), with 0.300-inch body width, through-hole mounting, and RoHS-compliant NiPdAu lead finish. Thermal impedance θJA is 101°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect | Unused internal node; must remain unconnected per datasheet. |
| 2 (CURR LIM) | Current limit control | Adjusts foldback or constant-current threshold via external resistor to VZ. |
| 3 (CURR SENS) | Current sense input | Monitors external sense resistor (RSC) to enable overcurrent protection. |
| 4 (IN–) | Inverting error amp input | Connects to output voltage divider; compares against internal reference for regulation. |
| 5 (IN+) | Non-inverting error amp input | Accepts reference voltage or feedback signal; used in shunt/floating configurations. |
| 6 (REF) | Reference output | Provides 7.15-V temperature-stable reference for external circuitry or divider biasing. |
| 7 (VCC–) | Negative supply rail | Ground or negative rail connection; required for bipolar operation and negative-output designs. |
| 8 (NC) | No-connect | Unused internal node; must remain unconnected. |
| 9 (FREQ COMP) | Frequency compensation | External capacitor sets dominant pole for loop stability across load/input conditions. |
| 10 (VCC+) | Positive supply rail | Main input power connection; supports up to 40 V continuous relative to VCC–. |
| 11 (VC) | Pass transistor collector | Internal collector node of series pass transistor; connects to input for standard configurations. |
| 12 (OUTPUT) | Regulated output | Delivers final regulated voltage; capable of sourcing up to 150 mA directly. |
| 13 (VZ) | Zener reference output | 6.2-V zener output used for current-limit biasing and auxiliary references. |
| 14 (NC) | No-connect | Unused internal node; must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable current limiting | Configurable foldback or constant-current protection using external RSC and CURR LIM pin. |
| Multi-topology support | Validated for series, shunt, floating, positive, and negative regulator configurations per Figures 1–12. |
| High PSRR | 86 dB ripple rejection with 5 µF CREF ensures clean output under noisy input conditions. |
| Low output noise | 2.5 µV RMS (100 Hz–10 kHz) with CREF = 5 µF supports precision analog and ADC reference supplies. |
| Wide input/output flexibility | Operates from 9.5 V to 40 V input and delivers 2–37 V output - one device covers most bench/lab supply needs. |
Applications
| Laboratory Bench Power Supply | Industrial Control System PSU |
|---|---|
|
Use Scenario: Adjustable DC bench supply powering test fixtures, sensor calibrators, and prototype boards requiring stable, user-tunable voltage rails. IC Role / Device Role / Timing Role: Primary series voltage regulator controlling output via front-panel potentiometer-adjusted R1/R2 divider. Use Value: Enables 2–37 V output adjustment with <0.015%/°C tempco and 1 mV/V load regulation - critical for calibration-grade accuracy. |
Use Scenario: Embedded 12 V or 24 V system supply in PLC I/O modules where reliability and long-term drift matter. IC Role / Device Role / Timing Role: Fixed-output linear regulator (e.g., 12 V via R1/R2) delivering clean power to microcontrollers and analog signal chains. Use Value: 74–86 dB ripple rejection and 20–2.5 µV noise ensure stable MCU clocking and low-noise ADC conversions. |
| Legacy Equipment Replacement | Programmable Power Module |
|
Use Scenario: Drop-in replacement for obsolete µA723C in vintage test gear, audio amplifiers, and telecom line cards. IC Role / Device Role / Timing Role: Direct functional and pin-compatible substitute maintaining original schematic and layout integrity. Use Value: Identical electrical specs and PDIP-14 footprint allow field upgrades without redesign or requalification. |
Use Scenario: Core regulator in modular programmable DC supplies where output voltage and current limit are software-configurable. IC Role / Device Role / Timing Role: Regulator IC with analog-programmable VOUT (via DAC-driven IN+ or REF) and digitally set current limit (via CURR LIM). Use Value: Dual analog control paths (IN+/IN– and CURR LIM/VZ) enable closed-loop digital supervision without added DACs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317L | Fixed 1.25-V reference; no separate VZ, REF, or CURR SENS pins; max 100 mA output. | Limited to positive-only, non-foldback designs; lacks independent reference and current-sense terminals. | Select LM317L only when simplicity and cost outweigh need for negative output, foldback limiting, or auxiliary reference use. |
| TL783 | Higher 125-V input rating; fixed 1.25-V reference; no VZ or FREQ COMP pins; requires external pass transistor for >70 mA. | Targeted at high-voltage industrial supplies (>60 V); not suitable for low-noise or multi-topology designs. | Choose TL783 only for >60 V input applications where UA723CNE4's 40 V limit is insufficient. |
Compared with LM317L and TL783, UA723CNE4 uniquely provides independent reference (REF), zener (VZ), current sense (CURR SENS), and foldback control (CURR LIM) pins - enabling true multi-topology design, lower-noise performance, and flexible protection schemes without added components.
Availability
UA723CNE4 is available at Aetrix Electronics and suitable for laboratory power supplies, industrial control system PSUs, legacy equipment replacement, and programmable power modules requiring stable component supply across extended production lifecycles.
Supply support for UA723CNE4 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 founded in 1930, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and consumer reach.
The UA723CNE4 belongs to TI's legacy precision voltage regulator product line, designed specifically for flexible, topology-agnostic linear regulation in test, measurement, and industrial equipment where adjustability, stability, and proven reliability are essential.
FAQ
What is the maximum input voltage the UA723CNE4 can handle?
The UA723CNE4 supports a continuous input voltage differential of up to 40 V between VCC+ and VCC–, with a peak rating of 50 V for ≤50 ms. Input voltage (VI) must be ≥9.5 V for proper regulation. Exceeding 40 V continuously risks permanent damage per absolute maximum ratings in SLVS057D.
Does the UA723CNE4 support negative output voltage configurations?
Yes, the UA723CNE4 supports negative output regulation using configurations shown in Figures 3, 8, and 10 of the datasheet. It requires ≥9 V between VCC+ and VCC– when VO is ≥ –9 V, and uses VCC– as the output reference rail - enabling true bipolar supply generation.
Can the UA723CNE4 be used without an external pass transistor?
Yes, the UA723CNE4 integrates a 150-mA series pass transistor, allowing full regulation up to 150 mA without external transistors. For higher currents, Figures 4 and 5 in the datasheet show npn/pnp external pass transistor connections - preserving regulation accuracy while scaling output capability.
What is the purpose of the FREQ COMP pin on the UA723CNE4?
The FREQ COMP pin on the UA723CNE4 accepts an external capacitor to set the dominant pole of the control loop, ensuring stability across varying load, input, and output conditions. Typical values range from 100 pF to 1000 pF depending on configuration - critical for preventing oscillation in high-gain regulator setups.
Is the UA723CNE4 pin-compatible with the original Fairchild µA723C?
Yes, the UA723CNE4 is a direct replacement for the Fairchild µA723C, sharing identical pinout, electrical specifications, and functional block diagram. TI explicitly states it is a "direct replacement" in the datasheet, and both use the same PDIP-14 (N) package with matching terminal assignments and thermal characteristics.
UA723CNE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 37V
- Voltage Dropout (Max):
- 3V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 86dB ~ 74dB (50Hz ~ 10kHz)
- Control Features:
- Current Limit
- Protection Features:
- Over Current
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
UA723CNE4 FAQ
1.How can I place an order for UA723CNE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UA723CNE4 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 UA723CNE4 reliable?
The price and inventory of UA723CNE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA723CNE4 is usually 5 days.
3.What payment methods are accepted for UA723CNE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA723CNE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA723CNE4?
UA723CNE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA723CNE4 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 UA723CNE4?
For technical support, including UA723CNE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA723CNE4 requirements.
6.How does Aetrix verify that UA723CNE4 is sourced from the original manufacturer or authorized distributors?
All UA723CNE4 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 UA723CNE4 meets industry standards.
7.What is the process for return or replacement of UA723CNE4?
All UA723CNE4 units undergo pre-shipment inspection (PSI). If there is an issue with UA723CNE4, 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 UA723CNE4 part is unused and in its original packaging.
Return procedure for UA723CNE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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