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onsemi KA723D
- Part No.:
- KA723D
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
KA723D.pdf
- Description:
- IC REG LIN POS ADJ 150MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,913
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Product details
Overview
KA723D 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 functions as a series regulator, shunt regulator, current regulator, or temperature controller in power management circuits.
For engineers reviewing the KA723D datasheet, pinout, applications, or equivalent options, key selection considerations include its ±5V differential input tolerance, 7.15V typical reference voltage, 86dB ripple rejection with 5µF CREF, 0.003%/°C tempco, and 14-SOP package compatibility with space-constrained linear regulator designs.
Technical Context
The KA723D integrates an internal Zener reference (6.8–7.5V), error amplifier, series pass transistor, current limit sensing, and frequency compensation circuitry. Its architecture supports both inverting and non-inverting configurations, with separate V+ and V− supply pins enabling dual-supply or floating operation.
It delivers stable regulation under varying line (9.5–40V input) and load (1–50mA) conditions, with short-circuit protection via external RSC and thermal stability maintained across 0°C to +70°C ambient. The 14-SOP package provides surface-mount compatibility while retaining identical electrical behavior to the through-hole KA723.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 7.15V typical; sets precise feedback threshold for output adjustment via external resistor divider |
| Output Voltage Range | 2V to 37V; enables wide-range programmable regulation without topology change |
| Line Regulation | 0.01% typ. (ΔVIN = 3V); ensures <0.5mV output shift over 3V input variation at fixed load |
| Ripple Rejection | 86dB with 5µF CREF; suppresses >99.99% of 10kHz–100kHz switching noise on input rail |
| Max Output Current | 150mA continuous; sufficient for low-power analog rails, sensor biasing, and reference supplies |
| Tempco | 0.003%/°C typ.; contributes ≤0.15% output drift over full 0–70°C operating range |
| Standby Current | 2.0–4.0mA; enables predictable quiescent power budgeting in always-on regulator stages |
Pinout & Package
KA723D is housed in a 14-pin Small Outline Package (14-SOP) with 1.27mm pitch, 8.56mm × 3.95mm body, and gull-wing leads suitable for reflow soldering. Pin numbering follows standard JEDEC MS-012AA orientation (pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply reference | Return path for internal circuitry; required for dual-supply or negative-output configurations |
| 2 (Non-Invert Input) | Error amp non-inverting input | Connects to voltage divider output for feedback; sets regulated output level |
| 3 (Invert Input) | Error amp inverting input | Connects to internal 7.15V reference; forms comparator node for regulation loop |
| 4 (Current Sense) | Current limit sense input | Monitors external sense resistor (RSC) to trigger foldback current limiting at ~65mA |
| 5 (VC) | Compensation node | Accepts external capacitor for loop stability; critical for transient response tuning |
| 6 (VZ) | Zener reference output | Provides 7.15V reference for external circuits; sourced up to 25mA |
| 7 (VREF) | Reference buffer output | Low-impedance buffered copy of VZ; drives high-impedance dividers with minimal error |
| 8 (GND) | Ground reference | Common return for load, feedback, and compensation networks |
| 9 (VO) | Regulated output | Main power output terminal; delivers up to 150mA with low noise and tight regulation |
| 10 (V+) | Positive supply input | Primary input rail; must exceed VO by ≥3V and remain ≤40V above V− |
| 11 (Freq Comp) | Frequency compensation | Alternative compensation node for high-frequency stability; used with external RC network |
| 12 (Current Limit) | Current limit control | Adjusts short-circuit threshold via external resistor; sets foldback knee point |
| 13 (NC) | No connect | Internally unconnected; must be left floating or tied to GND per layout guidelines |
| 14 (NC) | No connect | Internally unconnected; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output (2–37V) | Enables single-part support for multiple rail voltages using only two external resistors |
| 0.01% line regulation | Minimizes output variation due to input fluctuations-critical for precision analog subsystems |
| 86dB ripple rejection (with CREF) | Allows direct use after noisy switch-mode supplies without additional LC filtering |
| Integrated 7.15V reference with 15mA drive | Eliminates need for external reference IC in multi-rail systems requiring shared precision references |
| Dual-supply operation (±V) | Supports negative-output configurations and floating regulators without external level-shifting |
Applications
| Industrial Sensor Signal Conditioning | Programmable Bench Power Supply |
|---|---|
Use Scenario: Regulating excitation voltage for strain gauges and RTDs in PLC I/O modules. IC Role / Device Role / Timing Role: Precision series voltage regulator providing stable 5V/10V excitation with <0.5mV line-induced drift. Use Value: Enables 16-bit ADC accuracy by eliminating supply-induced gain error and thermal drift in bridge circuits. | Use Scenario: Core regulation stage in lab-grade variable DC power supplies with digital voltage control. IC Role / Device Role / Timing Role: Adjustable linear regulator controlled via DAC-driven feedback divider for 2–30V output programming. Use Value: Delivers low-noise, low-drift output with <2.5µVrms noise (CREF=5µF), meeting EN61000-3-2 conducted emission requirements. |
| Medical Instrumentation Reference Rails | Automotive Control Unit Biasing |
Use Scenario: Generating stable ±5V and +12V rails for op-amp front-ends and ADC drivers in portable ECG units. IC Role / Device Role / Timing Role: Dual-regulator configuration (positive/negative) using shared VZ reference for matched tracking. Use Value: Achieves <0.015%/°C combined tempco across rails, reducing common-mode offset drift in differential amplifiers. | Use Scenario: Providing clean 3.3V logic supply and 5V sensor interface rail in engine control units exposed to 12V battery transients. IC Role / Device Role / Timing Role: Linear post-regulator following buck converter, rejecting high-frequency ripple from switching stage. Use Value: Maintains 86dB suppression of 200kHz switching noise, preventing false triggering in CAN/LIN transceivers. |
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 1.25V reference; lower max output (37V same), but no V− pin or dual-supply capability | Lacks negative-output or floating regulator support; requires higher minimum load current (3.5mA vs. KA723D's 1mA) | Prefer LM317L for cost-sensitive single-supply designs where 1.25V reference suffices and dual-rail operation is unnecessary |
| TL783 | Higher input voltage rating (125V), but 0.2% line regulation (vs. 0.01%) and no integrated VZ reference output | Designed for high-voltage industrial supplies; lacks buffered VREF and current-sense flexibility of KA723D | Choose TL783 only when input exceeds 40V; otherwise KA723D offers superior regulation precision and reference integration |
Compared with LM317L and TL783, the KA723D uniquely combines dual-supply operation, integrated 7.15V reference with 15mA drive, and 0.01% line regulation-making it optimal for multi-rail precision analog systems where reference sharing and supply flexibility are critical.
Availability
KA723D is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable bench power supplies, medical instrumentation reference rails, and automotive control unit biasing requiring stable component supply and long-term obsolescence mitigation.
Supply support for KA723D 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 semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The KA723D belongs to Fairchild's precision linear regulator product line, designed specifically for applications demanding ultra-stable output voltage, low noise, and flexible configuration-including dual-supply, shunt, and current-regulator topologies.
FAQ
What is the maximum input-to-output voltage differential supported by the KA723D?
The KA723D supports a maximum input-output voltage differential of 40V, with a minimum differential of 3.0V required for regulation. This allows operation with inputs up to 40V above the output voltage, provided the total V+ to V− voltage remains within the 40V absolute maximum rating. Exceeding these limits risks permanent damage to the KA723D internal pass transistor and error amplifier.
Can the KA723D be used as a negative-output voltage regulator?
Yes, the KA723D supports negative-output configurations by connecting V+ to system ground and V− to a negative supply rail. Its dual-supply architecture and separate V+ and V− pins enable true floating operation. When configured this way, the KA723D regulates the voltage between VO and V−, delivering negative outputs from –2V to –37V with the same 0.01% line regulation and 86dB ripple rejection as positive-mode operation.
Does the KA723D require an external capacitor on the VREF pin for stability?
No, the KA723D does not require a capacitor on the VREF pin for basic stability. However, adding a 5µF capacitor between VREF and GND improves ripple rejection from 74dB to 86dB and reduces output noise from 20µVrms to 2.5µVrms. This capacitor also enhances long-term stability, lowering drift to 0.1% per 1000 hours. For precision applications, the 5µF CREF is strongly recommended.
What is the purpose of the VC and Freq Comp pins on the KA723D?
The VC pin serves as the primary compensation node for the internal error amplifier, accepting an external RC network to set dominant pole frequency and ensure loop stability. The Freq Comp pin provides an alternative compensation path optimized for higher-frequency applications, allowing independent tuning of phase margin when driving capacitive loads or operating at elevated switching frequencies. Both pins must be configured per the application circuit in the KA723D datasheet to avoid oscillation.
How does the KA723D implement current limiting, and can it be adjusted?
The KA723D implements foldback current limiting using the Current Sense (pin 4) and Current Limit (pin 12) terminals. An external sense resistor (RSC) between VO and Current Sense sets the short-circuit threshold-typically 10Ω for ~65mA limit. Pin 12 accepts an external resistor to ground to adjust the foldback knee point and slope. This dual-point control allows precise tailoring of current-limit behavior for different load fault profiles without modifying the main feedback network.
KA723D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
KA723D FAQ
1.How can I place an order for KA723D through Aetrix?
Please submit a Request for Quotation (RFQ) for KA723D 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 KA723D reliable?
The price and inventory of KA723D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA723D is usually 5 days.
3.What payment methods are accepted for KA723D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA723D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA723D?
KA723D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA723D 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 KA723D?
For technical support, including KA723D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA723D requirements.
6.How does Aetrix verify that KA723D is sourced from the original manufacturer or authorized distributors?
All KA723D 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 KA723D meets industry standards.
7.What is the process for return or replacement of KA723D?
All KA723D units undergo pre-shipment inspection (PSI). If there is an issue with KA723D, 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 KA723D part is unused and in its original packaging.
Return procedure for KA723D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KA723D Tags
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