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Texas Instruments UA723CDR — Discrete Semiconductors
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RoHS Compliant · Lead-Free EIA-481 Standard
Texas Instruments / Discrete Semiconductors

UA723CDR adjustable linear regulator, 150 mA, 14-SOIC

MPN UA723CDR
End of Life Spot Stock · 24-48h Dispatch 100% Original Sealed

Texas Instruments UA723CDR linear regulator, positive adjustable output, 150 mA, 14-SOIC (0.154", 3.90 mm width), surface mount, tape and reel.

In Stock: 33,449 pcs
MOQ: 1 pcs
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$0.86
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[SPEC] Essential Parameters Snapshot Full Specifications (13)
Package / Case 14-SOIC (0.154", 3.90mm Width)
ALT
Facing long factory lead times or allocation on UA723CDR? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (3)

Full Technical Specifications

13 Parameters
UA723CDR specifications
Parameter / AttributeSpecification / Value
Output typeAdjustable
MountingSurface Mount
Voltage - input40V
Voltage - output37V
Voltage - output (Min (Fixed))2V
Output current150mA
Operating temperature0°C ~ 70°C
PSRR74dB ~ 86dB (50Hz ~ 10kHz)
PackageTape & Reel (TR); Cut Tape (CT)
Case14-SOIC (0.154\", 3.90mm Width)
Control featuresCurrent Limit
Number of regulators1
Output configurationPositive
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for UA723CDR?

Package: DIP-14 / TO-100 metal can · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 96%
Supply Chain & Allocation Reality:

The LM723 is not a regulator but the CONTROLLER of one: an internal reference (about 7.15V), an error amplifier, a small pass transistor good for 150mA, and a current limiter with foldback - the kit every bench supply and lab-grade linear of the 1970s and 80s assembled around an external pass transistor, which is why the same chip runs at 150mA or 10A depending on what the schematic bolted to it. Its variants are the substitution content: the C grade moves the temperature and reference windows, and the metal-can body quietly drops the Vz reference pin, which the folded and floating designs cannot live without.

Verified Pin-Compatible Replacements (3 verified alternatives)

LM723C TI (National lineage) / STMicroelectronics DIP-14 / TO-100
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The Commercial Grade

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

Electrically the same controller: the same reference core, error amplifier, limiter and 150mA internal pass - with the commercial temperature window (about 0 to 70C) and a correspondingly wider reference tolerance band instead of the full industrial one.

Same input ceiling (40V class) and the same 2V-37V output architecture through the external pass stage.

Compatibility & Drop-In Notes: The grading rule of every linear family runs here too: precision upward is free, downward re-opens margins someone calculated. The window is in the datasheet, not on the part body.
Package & Solder Footprint: Same DIP-14 pinout; both package options exist in each grade.
Shenzhen Warehouse Stock & MOQ: Stocked; quote the grade the schematic assumed.
Request Volume Quote for LM723C Compare UA723CDR vs LM723C Spec Matrix
CA723 / TO-100 can versions RCA lineage / multiple TO-100 (10-pin metal can)
Functional Equivalent
Availability & Target Pricing:

The Can Body and the Missing Pin

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The metal-can body of the same controller - and its structural difference: the can has fewer pins, so it does not bring out the Vz reference output that the DIP-14 exposes, and its pin 5 ties to the case.

Same electrical envelope; the thermal path differs (can about 136 K/W against the DIP about 120).

Compatibility & Drop-In Notes: The substitution checklist for package moves on this chip: count the pins the schematic USES, not the pins the package has. Vz users stay in the DIP; everyone else may choose by thermal fit.
Package & Solder Footprint: 10-pin can against 14-pin DIP: physically and electrically not interchangeable in one direction.
Shenzhen Warehouse Stock & MOQ: Stocked where genuine; the vintage-restoration body.
Request Volume Quote for CA723 / TO-100 can versions Compare UA723CDR vs CA723 / TO-100 can versions Spec Matrix
LM317 / LM338 (modern simplification) TI / STMicroelectronics / multiple TO-220 / TO-3
Functional Equivalent
Availability & Target Pricing:

When the Features Are Not Needed, the Three Pins Win

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The modern answer for the jobs that never used the special features: a three-terminal adjustable regulator with its own protection, no compensation engineering, no external pass arithmetic - at the cost of the foldback limiter, the remote sense and the high-voltage envelope the 723 design carries.

The three-terminal family stops near 40V total; the 723 architecture with an external pass goes past input ceilings the TO-220 parts cannot.

Compatibility & Drop-In Notes: The redesign rule: if the schematic uses Vz, foldback or remote sense, modernizing means designing a new supply, not substituting a part. If it uses none of them, the three-terminal family delivers the same bench experience in three pins.
Package & Solder Footprint: Completely different circuits - this card is a redesign signpost, not a substitution.
Shenzhen Warehouse Stock & MOQ: Stocked; both eras available.
Request Volume Quote for LM317 / LM338 (modern simplification) Compare UA723CDR vs LM317 / LM338 (modern simplification) Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The 723 is a controller: 150mA internally, everything above that is the external pass transistor the design bolted to it. Repairs that measure the regulator at its own pin and stop have measured a fraction of the circuit.
  • The two values repairs disturb first: the compensation capacitor (pin 13, about 100pF class) and the current-sense resistor (about 0.7V divided by the intended limit). Oscillation and early current limiting are usually these two, not the chip.
  • The Vz pin is a package fact: the DIP-14 brings out the reference output, the 10-pin can cannot - designs that used it for negative or floating rails cannot take the metal body. Count the used pins before any package move.
  • Grades: LM723 against LM723C differ in temperature window and reference tolerance, not in circuit - keep the base grade where the calibration or the environment assumed it.
  • Dropout is about 3V on this architecture: the input-output differential is designed into the vintage transformer and heatsink math, and modern low-dropout expectations do not transfer.
  • Foldback limiting is a resistor network decision, not a chip feature to be assumed: a repaired supply that now limits at the wrong current is reporting the sense network, not a bad controller.
Frequently Asked Technical Questions

Q: Can an LM723C replace an LM723?

A: Electrically identical controller; the C grade narrows the temperature window and widens the reference tolerance band. Fine for room-temperature equipment; keep the base grade where the tighter reference window was the calibration assumption.

Q: What is the difference between the 14-pin DIP and the TO-100 can?

A: The can has fewer pins, so it does not bring out the Vz reference output the DIP exposes, and its pin 5 connects to the case. Negative and floating-rail designs that used Vz must stay in the DIP; thermal resistance differs slightly between the bodies.

Q: Why does my 723 supply go into current limit too early or oscillate?

A: Check the two design values that repairs disturb first: the current-sense resistor network (the limit is roughly 0.7V divided by it) and the compensation capacitor on pin 13. The controller is reporting those values faithfully.

Technical Details & Description

Package and board-fit constraints

The UA723CDR: The 1.27 mm pitch on a 14-lead SOIC is a standard two-layer board layout — no via-in-pad or microvia needed. Available in Tape & Reel (TR) or Cut Tape (CT) options, so the same reel serves both prototyping and production runs without a packaging change.

Output current and voltage envelope

Rated for 150 mA continuous output, adjustable from 2 V to 37 V via two external resistors — the classic 723 topology that lets a single BOM line cover multiple output rails by swapping the divider. Maximum input voltage is 40 V, so the dropout between input and output must stay within the 723's headroom requirement — typically 3 V for regulation. A 5 V output from a 12 V rail is fine; a 36 V output from a 40 V rail leaves only 4 V headroom, which is marginal under load.

PSRR across the audio band

PSRR is specified at 74 dB to 86 dB over 50 Hz to 10 kHz. At 50 Hz (mains ripple), the 86 dB figure means a 100 mVpp ripple on the input is attenuated to about 5 µVpp at the output — relevant for sensitive analog front-ends running off the same supply. The PSRR declines at higher frequencies; above 10 kHz the internal compensation roll-off reduces rejection, so a local LC filter ahead of the regulator is worth considering if the board carries switching converters.

Built-in current limit and temperature range

The current-limit control feature allows programming the foldback threshold with an external sense resistor — useful for protecting downstream loads during fault conditions without an extra supervisory IC. Not specified for extended industrial or automotive ambient.

Frequently asked questions

What is the PSRR of UA723CDR?

PSRR is 74 dB to 86 dB across 50 Hz to 10 kHz. The 86 dB figure applies at 50 Hz (mains ripple); rejection decreases as frequency rises.

What compliance documentation is available for UA723CDR?

ROHS3 compliant. No REACH, UL, or IEC certification is listed in the manufacturer's standard product data.

UA723CDR
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