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onsemi KA7815ETSTU
- Part No.:
- KA7815ETSTU
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7815ETSTU.pdf
- Description:
- IC REG LINEAR 15V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,351
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Product details
Overview
KA7815ETSTU from ON Semiconductor is a fixed-output +15 V, 1 A positive linear voltage regulator in TO-220 (dual-gauge) package, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It delivers stable DC power for industrial control logic supplies, analog sensor biasing, and legacy microcontroller core rails where low-noise, simple drop-in regulation is required.
For engineers reviewing the KA7815ETSTU datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal behavior, real-world load/line regulation limits, and validated alternative options for cost, tolerance, or temperature-range trade-offs.
Technical Context
The KA7815ETSTU implements a classic three-terminal series-pass architecture with internal error amplifier, reference voltage generator, current-limiting circuitry, thermal shutdown comparator, and SOA protection. Its output transistor is designed for continuous 1 A operation with adequate heatsinking and maintains regulation across –40°C to +125°C junction temperature.
It requires minimal external components: 0.33 μF input capacitor (CI) and 0.1 μF output capacitor (CO) for stability. Dropout voltage remains fixed at 2 V at 1 A and 25°C, and ripple rejection reaches 54–70 dB at 120 Hz depending on input voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 14.25–15.75 V (±5% tolerance over full load/line/temp range; 14.4–15.6 V at 25°C) |
| Output Current | Up to 1 A continuous; peak current capability of 2.2 A for transient loads |
| Dropout Voltage | 2 V at 1 A and 25°C - dictates minimum input voltage of 17 V for reliable 15 V output |
| Ripple Rejection | 54–70 dB at 120 Hz - suppresses AC line noise from unregulated DC supplies |
| Thermal Resistance | Junction-to-case: 5°C/W - enables high-power dissipation with standard TO-220 heatsink mounting |
| Quiescent Current | 5.2–8.0 mA - contributes <0.12 W loss at 15 V output, critical for low-standby-power designs |
| Short-Circuit Current | 250 mA - limits fault energy during output shorts without latch-up |
Pinout & Package
KA7815ETSTU uses the industry-standard TO-220 (dual-gauge) package with vertical mounting orientation and metal tab connected to GND for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input supply connection | Must be ≥17 V (≥2 V above 15 V output) and ≤30 V per absolute max rating; decoupled with 0.33 μF ceramic |
| 2 (GND) | Ground reference and thermal path | Electrically tied to metal tab; must be low-impedance connection to system ground plane and heatsink |
| 3 (Output) | Regulated +15 V output | Stabilized by 0.1 μF ceramic capacitor; drives load up to 1 A with ≤300 mV load regulation error |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Activates at ~170°C junction temperature to prevent permanent damage during sustained overload or poor heatsinking |
| SOA-protected pass transistor | Prevents secondary breakdown under simultaneous high voltage/current stress (e.g., during startup or capacitive load charging) |
| Fixed +15 V output | Eliminates external resistor network - reduces BOM count and improves long-term stability vs. adjustable regulators |
| Low output noise | 90 μV RMS (10 Hz–100 kHz) - suitable for analog front-ends and precision reference circuits without added filtering |
| Wide operating temperature | –40°C to +125°C junction range - qualified for industrial motor drives, factory automation, and outdoor equipment |
Applications
| Industrial PLC I/O Module Power | Legacy Microcontroller Core Supply |
|---|---|
Use Scenario: Powers digital I/O buffers and optocoupler drivers in programmable logic controller backplanes with 24 V DC input rails. IC Role / Device Role / Timing Role: Primary +15 V rail generator for level-shifting and isolation interface circuitry. Use Value: Delivers 1 A with <300 mV load regulation drift ensures consistent logic threshold margins across varying channel counts. |
Use Scenario: Supplies +15 V to vintage 8-bit microcontrollers (e.g., Intel 8085, Zilog Z80) requiring fixed core voltage with no external feedback. IC Role / Device Role / Timing Role: Standalone linear regulator replacing discrete transistor-zener solutions in retro-computing and instrumentation designs. Use Value: Eliminates trimming resistors and improves long-term voltage accuracy versus discrete alternatives. |
| Analog Sensor Signal Conditioning | DC Motor Control Logic Supply |
Use Scenario: Provides clean +15 V bias for op-amps, strain gauge bridges, and RTD signal chains in process transmitters. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital domains. Use Value: 90 μV output noise and 70 dB ripple rejection preserve sub-mV measurement resolution in 16-bit systems. |
Use Scenario: Powers gate driver logic and current-sense amplifiers in brushed DC motor controllers fed from rectified AC or battery sources. IC Role / Device Role / Timing Role: Isolated auxiliary supply for control ICs, independent of main H-bridge switching noise. Use Value: Thermal shutdown and SOA protection ensure reliability during stall conditions and PWM-induced input transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar positive linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7815CT | Same +15 V output, 1 A rating, TO-220 package; ±2% output tolerance (vs. ±5% for KA7815ETSTU); higher quiescent current (6.5–8.5 mA) | Better initial accuracy suits precision analog systems; slightly lower PSRR (63 dB typical) and higher IQ reduce efficiency in battery-backed designs | Select LM7815CT when tighter output tolerance is required and thermal margin allows higher IQ penalty. |
| KA7815AETU | Same family, improved ±2% output tolerance, 0°C to +125°C operating range (vs. –40°C to +125°C), identical pinout and electrical behavior | Reduced cold-start capability; otherwise drop-in compatible for commercial-temperature applications like office equipment and consumer appliances | Choose KA7815AETU for cost-sensitive commercial designs where extended low-temp operation is unnecessary. |
Compared with KA7815ETSTU, LM7815CT offers tighter voltage accuracy but higher quiescent loss, while KA7815AETU trades wide-temperature support for improved tolerance-both retain identical thermal protection and SOA behavior, enabling direct layout reuse in most cases.
Availability
KA7815ETSTU is available at Aetrix Electronics and suitable for industrial automation, analog instrumentation, and legacy embedded systems requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for KA7815ETSTU 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 (formerly Fairchild Semiconductor) is a global semiconductor supplier specializing in power management, analog, and discrete devices for automotive, industrial, and cloud infrastructure markets.
The KA78XXE series was developed as a robust, drop-in replacement for legacy 78xx regulators, emphasizing ruggedness, integrated protection, and wide-temperature operation for harsh-environment industrial use.
FAQ
What is the maximum input voltage for KA7815ETSTU?
The absolute maximum input voltage for KA7815ETSTU is 40 V when regulating 24 V output variants, but for the +15 V version specifically, the datasheet specifies 30 V maximum input under normal operating conditions. Exceeding 30 V risks exceeding safe power dissipation limits and may trigger thermal shutdown prematurely. Always maintain at least 2 V headroom above the 15 V output - i.e., 17–30 V input range is recommended.
Does KA7815ETSTU require external capacitors?
Yes, KA7815ETSTU requires a 0.33 μF ceramic capacitor on the input and a 0.1 μF ceramic capacitor on the output for stability and transient response. These values are specified in the datasheet test circuit and omitting them may cause oscillation or poor load regulation. Electrolytic bulk capacitance (e.g., 470 μF) is recommended upstream for ripple reduction but does not replace the mandatory ceramic bypass caps.
Is KA7815ETSTU pin-compatible with standard 7815 regulators?
Yes, KA7815ETSTU uses the standard 3-pin TO-220 configuration: Pin 1 = Input, Pin 2 = GND (tab), Pin 3 = Output - identical to LM7815, MC7815, and other industry-standard +15 V regulators. Mechanical footprint and solder pad layout are fully interchangeable, enabling direct replacement in existing PCBs without modification.
What protection features does KA7815ETSTU include?
KA7815ETSTU integrates three key protections: thermal overload shutdown (activates ~170°C junction), short-circuit current limiting (~250 mA foldback), and safe operating area (SOA) protection for the internal pass transistor. These operate autonomously without external components and reset automatically once fault conditions clear - critical for unattended industrial deployments.
Can KA7815ETSTU be used in adjustable configurations?
While KA7815ETSTU is a fixed +15 V device, it can be adapted for adjustable output using external resistive feedback networks - for example, connecting a resistor divider from output to GND and injecting a correction voltage into the GND pin. However, such configurations void guaranteed specifications and require careful validation; dedicated adjustable regulators (e.g., LM317) are preferred for variable-voltage designs.
KA7815ETSTU 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):
- 35V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (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
KA7815ETSTU FAQ
1.How can I place an order for KA7815ETSTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7815ETSTU 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 KA7815ETSTU reliable?
The price and inventory of KA7815ETSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7815ETSTU is usually 5 days.
3.What payment methods are accepted for KA7815ETSTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7815ETSTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7815ETSTU?
KA7815ETSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7815ETSTU 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 KA7815ETSTU?
For technical support, including KA7815ETSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7815ETSTU requirements.
6.How does Aetrix verify that KA7815ETSTU is sourced from the original manufacturer or authorized distributors?
All KA7815ETSTU 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 KA7815ETSTU meets industry standards.
7.What is the process for return or replacement of KA7815ETSTU?
All KA7815ETSTU units undergo pre-shipment inspection (PSI). If there is an issue with KA7815ETSTU, 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 KA7815ETSTU part is unused and in its original packaging.
Return procedure for KA7815ETSTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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