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Texas Instruments LM723CH/NOPB
- Part No.:
- LM723CH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-100-10 Metal Can
- Datasheet:
-
LM723CH/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 150MA TO100
- Quantity:
- Payment:
- Shipping:
Inventory:213
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Product details
Overview
LM723CH/NOPB from Texas Instruments is a precision voltage regulator IC designed for series, shunt, current-regulating, and temperature-control applications. It delivers up to 150 mA output current internally, supports external pass transistors for >10 A loads, features adjustable output (2 V to 37 V), foldback or linear current limiting, and operates over 0°C to +70°C. It is commonly used in lab power supplies and industrial control systems requiring stable low-drift regulation.
For engineers reviewing the LM723CH/NOPB datasheet, LM723CH/NOPB pinout, LM723CH/NOPB application, or LM723CH/NOPB equivalent, key selection considerations include its TO-100 metal-can package with case-connected pin 5, ±0.015%/°C typical output voltage drift, 7.15 V internal reference, 86 dB ripple rejection (with 5 µF CREF), and compatibility with both linear and switching regulator topologies.
Technical Context
The LM723CH/NOPB integrates a precision reference amplifier, error amplifier, current-sense comparator, and output driver in a single monolithic IC. Its architecture supports configurable current limiting-either fixed or foldback-via external resistor RSC, and allows direct connection of VZ to an external 6.2 V zener for improved stability in metal-can configurations.
It operates as a two-stage regulator: the internal reference (7.15 V) biases the error amplifier, which compares feedback voltage against reference and drives the output transistor stage. Input voltage range spans 9.5 V to 40 V, with input-output differential up to 38 V, enabling high-voltage floating and negative regulator designs per Figures 17–25 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 7.15 V typical - provides stable bias point for error amplifier; enables precise output setting via resistive divider |
| Output Voltage Range | 2 V to 37 V adjustable - supports wide-range positive, negative, and floating supply designs |
| Max Input Voltage | 40 V continuous - defines absolute upper limit for VIN without damage; requires ≥3 V headroom for regulation |
| Output Current (Internal) | 150 mA max - sufficient for low-power regulators; external NPN/PNP transistors extend capability to >10 A |
| Temperature Coefficient | 0.003–0.015 %/°C - determines output drift over 0°C to +70°C operating range; critical for precision analog systems |
| Ripple Rejection | 86 dB with 5 µF CREF - suppresses AC line noise at error amp input; improves PSRR in noisy environments |
| Standby Current Drain | 1.7–4.0 mA at VIN = 30 V - impacts quiescent power in battery-backed or low-power standby circuits |
Pinout & Package
LM723CH/NOPB uses the TO-100 (LME) metal-can package with 10 leads. Pin 5 is internally connected to the metal case and must be tied to circuit ground or appropriate reference potential. Thermal resistance θJC is 22°C/W, supporting moderate power dissipation when properly heatsinked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (V−) | Negative supply rail input | Reference ground for internal amplifiers; must be at lowest system potential |
| Pin 2 (Current Sense) | Current-limit sense input | Monitors voltage drop across RSC to trigger foldback or linear current limiting |
| Pin 3 (V+) | Positive supply rail input | Primary power input for internal circuitry; rated up to 40 V |
| Pin 4 (VOUT) | Regulator output driver | Drives internal pass transistor base or external transistor base; open-collector NPN |
| Pin 5 (Case) | Thermal and electrical case connection | Internally bonded to metal can; must be grounded or referenced per layout guidelines |
| Pin 6 (Non-Inverting Input) | Error amplifier non-inverting input | Connects to feedback divider top node; sets regulated output voltage |
| Pin 7 (Inverting Input) | Error amplifier inverting input | Connects to feedback divider bottom node or ground; forms control loop |
| Pin 8 (VZ) | Zener reference output | Provides 7.15 V reference; may connect to external 6.2 V zener for improved stability |
| Pin 9 (VC) | Collector supply for output transistor | Bypassed externally; supplies collector current path for internal pass device |
| Pin 10 (RSC) | Current limit set resistor | External resistor between this pin and V− sets short-circuit current threshold (e.g., 10 Ω → 65 mA) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2 V to 37 V via external resistor divider - enables single-IC support for multiple supply rails |
| Foldback or linear current limiting | Selectable via RSC configuration - protects load and regulator during overload or short-circuit events |
| Low output noise | 2.5 μVrms (100 Hz–10 kHz, 5 µF CREF) - minimizes interference in sensitive analog signal chains |
| High ripple rejection | 86 dB with filtered reference capacitor - maintains regulation under high-ripple input conditions |
| Metal-can thermal performance | θJC = 22°C/W - enables reliable operation up to 800 mW internal dissipation with proper heatsinking |
Applications
| Lab Bench Power Supply | Industrial Process Controller |
|---|---|
Use Scenario: Programmable DC bench supply delivering 0–30 V / 0–3 A with fine voltage/current control. IC Role / Device Role / Timing Role: Core series regulator controller managing feedback loop, current limiting, and reference stability. Use Value: Adjustable 2–37 V output and foldback protection enable safe, flexible lab use across diverse DUTs. |
Use Scenario: Analog I/O module powering 4–20 mA transmitters and sensor excitation circuits in PLC racks. IC Role / Device Role / Timing Role: Precision shunt or series regulator providing stable 5 V, 12 V, or 24 V rails for analog front-ends. Use Value: 0.015 %/°C drift and 1.5 mV load regulation ensure measurement accuracy over ambient temperature swings. |
| Negative Voltage Generator | High-Voltage Floating Regulator |
Use Scenario: Dual-rail supply for op-amp circuits requiring symmetric ±15 V from a single input source. IC Role / Device Role / Timing Role: Negative regulator configured per Figure 18, using V− as output reference and V+ as return path. Use Value: Supports −6 V to −250 V outputs with <2 mV load regulation at 100 mA, enabling true bipolar analog design. |
Use Scenario: Isolated high-side bias supply for gate drivers in motor inverters or HV power converters. IC Role / Device Role / Timing Role: Floating regulator (Figure 22) where LM723CH/NOPB regulates referenced to output, not ground. Use Value: Withstands 38 V input-output differential and delivers +50 V at <20 mV load regulation - ideal for bootstrap and floating domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317L | Fixed 1.25 V reference; no separate current-sense or VZ pins; limited to 100 mA output | Best for simple adjustable positive regulators only; lacks negative/floating/shunt modes | Choose LM317L only for cost-sensitive, low-current, single-rail designs where full LM723CH/NOPB flexibility is unnecessary |
| TL431ACDR | 2.5 V reference with programmable output; no integrated error amp drive or current limiting logic | Requires external transistor for >100 mA; cannot implement foldback limiting or high-voltage floating topologies | Use TL431ACDR for compact shunt regulation or as reference in custom regulator designs - not a functional replacement for LM723CH/NOPB's full control architecture |
Compared with LM317L and TL431ACDR, the LM723CH/NOPB uniquely integrates reference, error amplifier, current-sense comparator, and driver in one TO-100 package - enabling series, shunt, negative, floating, and switching regulator implementations without redesigning core control logic.
Availability
LM723CH/NOPB is available at Aetrix Electronics and suitable for lab power supplies, industrial process controllers, negative voltage generators, and high-voltage floating regulators requiring stable component supply across extended production lifecycles.
Supply support for LM723CH/NOPB 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 heritage in precision analog ICs and power management solutions.
The LM723CH/NOPB belongs to TI's legacy linear regulator controller product line, engineered for versatility in analog power system design - supporting series, shunt, current-source, and temperature-compensated regulation topologies.
FAQ
What is the maximum input voltage rating for LM723CH/NOPB?
The LM723CH/NOPB has a maximum continuous input voltage rating of 40 V across V+ and V− terminals. Exceeding this risks permanent damage. The absolute maximum pulse voltage is 50 V for durations ≤50 ms. Designers must ensure input filtering and transient suppression to maintain reliability within these limits. The LM723CH/NOPB also specifies a maximum input-output differential of 38 V, which constrains usable headroom in high-output applications.
How does LM723CH/NOPB implement current limiting?
The LM723CH/NOPB implements current limiting via its dedicated Current Sense pin (Pin 2), which monitors voltage drop across external resistor RSC connected between Pin 10 and V−. At ~0.65 V drop, the internal comparator triggers foldback or linear limiting depending on external component configuration. For example, a 10 Ω RSC sets short-circuit current to 65 mA. This feature protects both the LM723CH/NOPB and downstream loads during fault conditions without requiring additional ICs.
Can LM723CH/NOPB be used for negative voltage regulation?
Yes, the LM723CH/NOPB supports negative voltage regulation as shown in Figure 18 of the official datasheet. In this configuration, V− becomes the regulated output node while V+ serves as the return path. The error amplifier inputs and current-sense circuit remain fully functional, enabling precise −6 V to −250 V outputs with measured load regulation as low as 2 mV at 100 mA. Pin 5 (case) must be tied to the appropriate reference potential - typically the negative rail - to maintain correct biasing.
What is the purpose of the VZ pin on LM723CH/NOPB?
The VZ pin (Pin 8) on LM723CH/NOPB provides the internal 7.15 V zener reference voltage. It can be used directly as a stable reference for external circuitry or connected to an external 6.2 V zener diode (as recommended for metal-can packages) to improve long-term stability and reduce temperature drift. When used with the external zener, VZ forms a compensated reference that lowers output voltage drift to 0.002%/°C in some configurations - critical for high-precision analog systems relying on the LM723CH/NOPB.
Is LM723CH/NOPB RoHS compliant?
Yes, LM723CH/NOPB is RoHS compliant, as confirmed by Texas Instruments' official packaging addendum. The "/NOPB" suffix explicitly denotes lead-free finish and compliance with EU RoHS Directive 2011/65/EU. It ships in bulk packaging (500 units) in the TO-100 (LME) metal-can package and carries MSL Level-1 (unlimited floor life). Full compliance documentation, including material declarations and test reports, is available through TI's Quality & Environmental Data portal.
LM723CH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-100-10 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- 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):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 86dB ~ 74dB (50Hz ~ 10kHz)
- Control Features:
- Current Limit, Frequency Control
- Protection Features:
- Short Circuit
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-100-10
LM723CH/NOPB FAQ
1.How can I place an order for LM723CH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM723CH/NOPB 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 LM723CH/NOPB reliable?
The price and inventory of LM723CH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM723CH/NOPB is usually 5 days.
3.What payment methods are accepted for LM723CH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM723CH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM723CH/NOPB?
LM723CH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM723CH/NOPB 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 LM723CH/NOPB?
For technical support, including LM723CH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM723CH/NOPB requirements.
6.How does Aetrix verify that LM723CH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM723CH/NOPB 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 LM723CH/NOPB meets industry standards.
7.What is the process for return or replacement of LM723CH/NOPB?
All LM723CH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM723CH/NOPB, 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 LM723CH/NOPB part is unused and in its original packaging.
Return procedure for LM723CH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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