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Product details
Overview
KA723 from Fairchild Semiconductor is a precision monolithic voltage regulator IC capable of adjustable output (2V–37V), 0.01% line/load regulation, and 150mA output current without external pass transistor. It operates from positive or negative supplies and is used in lab power supplies, instrumentation references, and industrial control feedback loops.
For engineers reviewing the KA723 datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5V differential input tolerance, 7.15V typical reference voltage, 74–86dB ripple rejection (dependent on CREF), 0.003–0.015%/°C temperature coefficient, and dual-package availability (14-DIP/14-SOP).
Technical Context
The KA723 integrates a precision 7.15V Zener reference, error amplifier with non-inverting/inverting inputs, series pass transistor driver, current-sense circuitry, and frequency compensation network. Its architecture supports both series and shunt regulator configurations via external resistor networks.
It delivers stable regulation under varying line (9.5–40V input) and load (1–50mA) conditions while maintaining low standby current (2.0–4.0mA) and high thermal stability-critical for analog measurement systems requiring long-term drift <0.1%/1000hr.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 7.15V typical; sets precise regulation point for external divider network |
| Output Voltage Range | 2V to 37V adjustable; enables wide-range DC supply design without topology change |
| Line Regulation | 0.01% typ. (VI = 12–15V); ensures minimal output shift during input fluctuation |
| Ripple Rejection | 86dB with 5µF CREF; suppresses high-frequency noise from switching pre-regulators |
| Max Output Current | 150mA continuous; sufficient for driving op-amp bias networks or small logic loads |
| Temp Coefficient | 0.003–0.015%/°C; supports stable operation across 0°C to +70°C industrial range |
| Input Voltage Range | 9.5V to 40V; accommodates unregulated transformer-rectifier or battery-derived rails |
Pinout & Package
Available in 14-pin dual in-line package (14-DIP) and 14-pin small outline package (14-SOP), both with standard 2.54mm (DIP) or 1.27mm (SOP) lead pitch. Pin functions are identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC) | Voltage Control | Compensation node for external capacitor to stabilize loop response |
| 2 (V-) | Negative Supply | Ground or negative rail reference for dual-supply operation |
| 3 (VZ) | Zener Reference Tap | Access to internal 7.15V Zener; used for shunt or tracking regulator modes |
| 4 (VREF) | Reference Output | Buffered 7.15V reference source; drives external divider with ≤15mA sink |
| 5 (Non-Invert Input) | Error Amp Non-Inverting Input | Connects to output divider top node for standard series regulation |
| 6 (Invert Input) | Error Amp Inverting Input | Connects to divider midpoint; compares against VREF to correct VO |
| 7 (Current Sense) | Current Limit Sense | Monitors emitter current of external pass transistor for foldback limiting |
| 9 (VO) | Output | Main regulated output terminal; connects to load and feedback network |
| 10 (RSC) | Current Limit Set | Resistor-to-ground sets short-circuit current limit threshold (e.g., 10Ω → 65mA) |
| 11 (V+) | Positive Supply | Main input rail; must exceed VO by ≥3V for regulation |
| 12 (Freq Comp) | Frequency Compensation | External capacitor connection for dominant-pole compensation |
| 13 (NC) | No Connect | Internally unused; leave floating or grounded per layout best practice |
| 14 (NC) | No Connect | Internally unused; leave floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2V–37V via two-resistor divider; eliminates need for multiple fixed-voltage regulators |
| High Ripple Rejection | 86dB with 5µF CREF; enables clean output even when fed from noisy SMPS-derived rails |
| Dual-Supply Operation | Supports both positive and negative supply configurations; simplifies bipolar supply design |
| Precision Reference | 7.15V ±0.35V reference with 0.003%/°C drift; serves as stable benchmark for feedback |
| Low Standby Current | 2.0–4.0mA at no load; reduces quiescent power in always-on monitoring circuits |
Applications
| Laboratory Bench Power Supply | Industrial Process Controller Reference |
|---|---|
Use Scenario: Adjustable benchtop DC supply delivering 2–30V at up to 150mA for prototype testing. IC Role / Device Role / Timing Role: Primary series voltage regulator controlling output via external R1/R2 divider and pass transistor. Use Value: 0.01% line regulation and 0.03% load regulation ensure stable voltage under variable AC line and load conditions. | Use Scenario: Precision reference source for 4–20mA transmitter calibration and sensor excitation. IC Role / Device Role / Timing Role: Shunt regulator configuration using VZ pin to generate stable 7.15V reference for DACs and ADCs. Use Value: 0.003%/°C tempco and 0.1%/1000hr long-term stability maintain accuracy over extended field deployment. |
| Temperature-Controlled Oven Circuit | Analog Signal Conditioning Module |
Use Scenario: Closed-loop heater driver where KA723 regulates thermistor bias and error amp supply. IC Role / Device Role / Timing Role: Dual-role device: provides stable VREF for thermistor bridge and powers op-amp error amplifier. Use Value: Independent VREF and VO outputs allow isolated biasing-reducing thermal coupling and measurement error. | Use Scenario: Low-noise front-end supply for instrumentation amplifiers and precision filters. IC Role / Device Role / Timing Role: Low-noise series regulator (2.5µVrms with 5µF CREF) powering sensitive analog stages. Use Value: 2.5µVms output noise and 86dB ripple rejection preserve signal integrity in µV-level measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317 | 1.25V reference (vs. 7.15V); requires different divider ratio; lower max input-output differential (40V vs. KA723's 40V) | More common in consumer-grade adjustable supplies; lacks dedicated VZ and VC pins for shunt/tracking modes | Choose LM317 for cost-sensitive, single-supply designs where 1.25V reference suffices and VZ functionality is unnecessary |
| TL783 | Higher input voltage rating (125V), but higher minimum load (15mA vs. KA723's 0mA); no VZ pin | Better suited for high-input-voltage industrial supplies; not suitable for low-current or shunt-mode use | Choose TL783 only when input exceeds 40V; otherwise KA723 offers superior low-load stability and multi-mode flexibility |
Compared with LM317 and TL783, the KA723 uniquely supports shunt, series, and current-regulator topologies via dedicated VZ, VC, and current-sense pins-enabling compact, multi-function analog power designs without additional ICs.
Availability
KA723 is available at Aetrix Electronics and suitable for laboratory power supplies, industrial process controllers, temperature-controlled ovens, and analog signal conditioning modules requiring stable component supply across extended production cycles.
Supply support for KA723 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
Fairchild Semiconductor was a U.S.-based analog and power IC designer acquired by ON Semiconductor in 2016; known for high-reliability linear regulators and discrete power devices.
The KA723 belongs to Fairchild's precision linear regulator product line, designed specifically for applications demanding ultra-stable reference voltages, multi-topology flexibility, and low-drift performance in industrial and test equipment.
FAQ
What is the reference voltage of the KA723 and how is it used?
The KA723 features a precision 7.15V internal Zener reference, accessible at the VREF pin. This voltage serves as the error amplifier's comparison基准 for feedback regulation. In standard series configurations, the output voltage is set by an external resistor divider connected between VO, VREF, and V–. The KA723 uses this reference to maintain tight regulation across line, load, and temperature variations-making KA723 ideal for metrology-grade analog supplies.
Can the KA723 operate with negative supply rails?
Yes, the KA723 supports both positive and negative supply operation as stated in its official features list. When used with a negative rail, V– becomes the most negative potential, V+ is less negative (or ground), and regulation occurs relative to that reference. This capability allows KA723 to function in bipolar power supplies and floating regulator applications-unlike many fixed-output regulators that require strictly positive input.
What is the maximum output current capability of the KA723 without external components?
The KA723 delivers up to 150mA of continuous output current using only its internal series pass transistor, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This is sufficient for driving moderate analog loads such as op-amp bias networks, LED indicators, or small logic sections. For higher currents, an external pass transistor is required-enabled via the current-sense and VC pins in KA723's architecture.
How does the KA723 achieve high ripple rejection, and what capacitor value is recommended?
The KA723 achieves up to 86dB ripple rejection at 100kHz–10kHz when a 5µF capacitor is placed on the CREF pin, per the Electrical Characteristics table. This capacitor stabilizes the internal reference and improves PSRR by filtering high-frequency noise before it reaches the error amplifier. Without CREF, ripple rejection drops to 74dB-so the 5µF value is strongly recommended for noise-sensitive applications like data acquisition front-ends using KA723.
Does the KA723 require minimum load current to maintain regulation?
No, the KA723 does not require a minimum load current to maintain regulation. Its standby current drain is specified at 2.0–4.0mA with zero load (IL = 0), and load regulation is characterized down to 1mA. This zero-load capability makes KA723 suitable for intermittent-use circuits and low-power standby modes-distinct from regulators like TL783 that mandate ≥15mA minimum load. KA723 maintains regulation integrity even when the output is lightly loaded or open.
KA723 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- 4 mA
- PSRR:
- 86dB ~ 74dB (100kHz ~ 10kHz)
- Control Features:
- Current Limit
- Protection Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-MDIP
KA723 FAQ
1.How can I place an order for KA723 through Aetrix?
Please submit a Request for Quotation (RFQ) for KA723 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 KA723 reliable?
The price and inventory of KA723 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA723 is usually 5 days.
3.What payment methods are accepted for KA723?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA723 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA723?
KA723 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA723 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 KA723?
For technical support, including KA723 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA723 requirements.
6.How does Aetrix verify that KA723 is sourced from the original manufacturer or authorized distributors?
All KA723 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 KA723 meets industry standards.
7.What is the process for return or replacement of KA723?
All KA723 units undergo pre-shipment inspection (PSI). If there is an issue with KA723, 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 KA723 part is unused and in its original packaging.
Return procedure for KA723:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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