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onsemi KA7824ETSTU
- Part No.:
- KA7824ETSTU
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7824ETSTU.pdf
- Description:
- IC REG LINEAR 24V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,868
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Product details
Overview
KA7824ETSTU from ON Semiconductor is a fixed-output +24 V, 1 A positive linear voltage regulator in TO-220 (dual-gauge) package with thermal overload, short-circuit, and safe operating area protection. It delivers stable DC power for industrial control logic, legacy telecom power supplies, and embedded system auxiliary rails where input-to-output differential exceeds 2 V.
For engineers reviewing the KA7824ETSTU datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed ±4% output tolerance at 25°C, 2 V dropout voltage at 1 A, 50–67 dB ripple rejection (120 Hz), 28 mΩ output resistance, and -40°C to +125°C operating temperature range.
Technical Context
The KA7824ETSTU implements a classic three-terminal series pass architecture with internal error amplifier, bandgap reference, current-limiting circuitry, and thermal shutdown. Its SOA protection prevents secondary breakdown under transient overloads, while the starting circuit ensures reliable turn-on even with slow-rising input rails.
It operates without external compensation and requires only two capacitors: 0.33 μF input (CI) and 0.1 μF output (CO). The device draws 5.2–8.0 mA quiescent current and maintains regulation across 5 mA–1.0 A load, with line regulation specified up to 480 mV over VI = 27–38 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +24.00 V nominal, ±4% tolerance at 25°C - ensures compatibility with 24 V logic and solenoid drivers requiring tight DC rail stability |
| Max Output Current | 1 A continuous - supports medium-power analog circuits, relay coils, and sensor signal conditioning stages |
| Dropout Voltage | 2 V at 1 A, 25°C - mandates minimum 26 V input for full-load 24 V output; dictates heatsink sizing for >5 W dissipation |
| Ripple Rejection | 50–67 dB at 120 Hz - suppresses rectified AC noise in unregulated wall-adapter or transformer-based supplies |
| Output Resistance | 28 mΩ at 1 kHz - limits load-induced voltage sag to ≤28 mV per 1 A step change |
| Thermal Protection | Internal junction thermal shutdown - prevents catastrophic failure during sustained overload or inadequate heatsinking |
| Noise Voltage | 120 μV RMS (10 Hz–100 kHz) - suitable for low-noise analog front-ends where switching regulators are unacceptable |
Pinout & Package
KA7824ETSTU is housed in a TO-220 (dual-gauge) package with electrically isolated tab, enabling direct mounting to heatsinks without insulating washers. Pin 1 is INPUT, Pin 2 is GND, Pin 3 is OUTPUT - standard configuration compatible with legacy 78xx footprint layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated DC input supply | Accepts 27–38 V DC; must be decoupled with ≥0.33 μF ceramic capacitor close to pin |
| 2 (GND) | Reference and return path | Common ground for input, output, and internal bias; low-impedance connection critical for stability |
| 3 (OUTPUT) | Regulated +24 V output | Delivers up to 1 A; requires ≥0.1 μF ceramic output capacitor for high-frequency PSRR and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +24 V output | Eliminates external resistor network; reduces BOM count and layout complexity vs. adjustable regulators |
| Integrated SOA protection | Prevents second breakdown during inductive load switching or output short transients without external foldback circuitry |
| Thermal shutdown | Automatically disables output above safe junction temperature (~150°C), enabling safe recovery after cooling |
| Short-circuit current limit | Clamps output to ~230 mA during hard shorts, limiting power dissipation and enabling fuseless designs |
| Wide operating temperature | -40°C to +125°C junction range supports deployment in industrial enclosures and outdoor equipment |
Applications
| Industrial PLC I/O Modules | Legacy Telecom Power Supplies |
|---|---|
Use Scenario: Providing isolated 24 V DC for digital input sensing and relay driver outputs in programmable logic controllers. IC Role / Device Role / Timing Role: Primary 24 V rail regulator delivering clean, protected power to optocoupler interfaces and solid-state relays. Use Value: ±4% output tolerance and 28 mΩ output resistance ensure consistent logic-level recognition and relay coil actuation across temperature and load. | Use Scenario: Generating stable 24 V bias for analog line card circuitry in PSTN central office equipment. IC Role / Device Role / Timing Role: Post-regulator for transformer-rectifier-derived unregulated 28–32 V inputs, rejecting 120 Hz ripple from full-wave rectification. Use Value: 50–67 dB ripple rejection and 120 μV noise enable low-distortion voice channel amplification without added filtering. |
| Embedded System Auxiliary Rails | Test & Measurement Equipment |
Use Scenario: Supplying 24 V to motor drivers, fan controllers, and analog sensor excitation circuits in compact embedded systems. IC Role / Device Role / Timing Role: Local point-of-load regulator converting higher system bus voltage (e.g., 36 V) to 24 V with integrated fault protection. Use Value: Thermal and short-circuit protection allow safe operation in space-constrained enclosures without dedicated monitoring circuitry. | Use Scenario: Powering precision op-amp stages, DAC buffers, and reference circuits in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise, low-drift DC source replacing battery or switching supply where EMI must be minimized. Use Value: -1.5 mV/°C drift and 120 μV noise support sub-0.1% measurement accuracy over ambient temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar positive linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7824CT | Same 24 V output, ±2% tolerance, but higher quiescent current (6–8 mA vs. 5.2–8.0 mA); no SOA protection | Lacks safe operating area protection - unsuitable for inductive loads without external current limiting | Select LM7824CT only when tighter initial tolerance is required and load is purely resistive or capacitive |
| MC7824CT | Identical electrical specs and pinout; manufactured by ON Semiconductor (post-Fairchild integration), same TO-220 package | No functional difference; MC7824CT is the updated ON Semiconductor part number per Fairchild integration | MC7824CT is a direct replacement with identical form, fit, and function - recommended for new designs and long-term supply continuity |
Compared with LM7824CT, KA7824ETSTU provides SOA protection critical for driving relays or motors, while MC7824CT offers identical performance with enhanced manufacturer support and lifecycle assurance under the ON Semiconductor brand.
Availability
KA7824ETSTU is available at Aetrix Electronics and suitable for industrial control systems, legacy telecom infrastructure, and embedded auxiliary power rails requiring stable component supply, long-life design, and proven thermal robustness.
Supply support for KA7824ETSTU 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
ON Semiconductor is a global semiconductor supplier focused on energy-efficient electronics, delivering power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The KA7824ETSTU belongs to the KA78XXE fixed-voltage linear regulator family, designed for cost-sensitive, high-reliability applications where simplicity, ruggedness, and wide temperature operation outweigh efficiency concerns.
FAQ
What is the maximum input voltage rating for KA7824ETSTU?
The KA7824ETSTU has an absolute maximum input voltage of 40 V when regulating 24 V output. Operation above this level risks permanent damage. For reliable long-term use, keep input voltage ≤38 V under full load, as specified in the Electrical Characteristics table for VI = 27–38 V.
Does KA7824ETSTU require external capacitors, and what values are recommended?
Yes, KA7824ETSTU requires two external capacitors: a 0.33 μF ceramic capacitor (CI) between INPUT and GND, placed as close as possible to the device, and a 0.1 μF ceramic capacitor (CO) between OUTPUT and GND. These stabilize the regulator and ensure adequate ripple rejection and transient response per the datasheet test circuit.
Can KA7824ETSTU be used in adjustable configurations?
While KA7824ETSTU is a fixed 24 V regulator, it can be adapted for adjustable output using external resistors and a Zener diode in the feedback path - however, this modifies regulation accuracy, line/load regulation, and thermal behavior. The datasheet notes such use is possible but not characterized; fixed-voltage operation is the validated, guaranteed mode for KA7824ETSTU.
What is the thermal resistance and heatsink requirement for KA7824ETSTU at 1 A output?
KA7824ETSTU has RθJC = 5°C/W and RθJA = 65°C/W (TO-220, no heatsink). At 1 A with 2 V dropout (2 W dissipation), junction temperature rise is 10°C above case with minimal heatsink. To stay within 125°C max TJ at 70°C ambient, a heatsink with ≤25°C/W total thermal resistance (including interface) is recommended.
Is KA7824ETSTU RoHS compliant and lead-free?
Yes, KA7824ETSTU is RoHS compliant and lead-free. As a Fairchild product integrated into ON Semiconductor's portfolio, it meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and complies with EU RoHS Directive 2011/65/EU and China RoHS, with Pb-free terminations and halogen-free molding compound.
KA7824ETSTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 24V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 67dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
KA7824ETSTU FAQ
1.How can I place an order for KA7824ETSTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7824ETSTU 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 KA7824ETSTU reliable?
The price and inventory of KA7824ETSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7824ETSTU is usually 5 days.
3.What payment methods are accepted for KA7824ETSTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7824ETSTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7824ETSTU?
KA7824ETSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7824ETSTU 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 KA7824ETSTU?
For technical support, including KA7824ETSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7824ETSTU requirements.
6.How does Aetrix verify that KA7824ETSTU is sourced from the original manufacturer or authorized distributors?
All KA7824ETSTU 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 KA7824ETSTU meets industry standards.
7.What is the process for return or replacement of KA7824ETSTU?
All KA7824ETSTU units undergo pre-shipment inspection (PSI). If there is an issue with KA7824ETSTU, 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 KA7824ETSTU part is unused and in its original packaging.
Return procedure for KA7824ETSTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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