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onsemi KA7631TS
- Part No.:
- KA7631TS
- Manufacturer:
- onsemi
- Package:
- 10-SIP, 10-SIPH
- Datasheet:
-
KA7631TS.pdf
- Description:
- IC REG LINEAR 5.1V/9V/12V 10SIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,875
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Product details
Overview
KA7631TS from Fairchild Semiconductor is a fixed multi-output positive voltage regulator providing three precision DC outputs: 5.1V ±2% (Output 1), 9V ±2% (Output 2), and 12V ±2% (Output 3 via external PNP transistor). It delivers up to 0.5A on Outputs 1 & 2, supports 1A on Output 3 with external transistor, includes internal reset generation, TTL-disable capability for Outputs 2 & 3, and thermal shutdown protection - used in automotive body control modules requiring stable dual-rail power.
For engineers reviewing the KA7631TS datasheet, pinout, applications, or equivalent options, key selection considerations include its 10-SIP-H/S package, dual-disable TTL inputs, reset pulse delay programmability via external capacitor, dropout voltage of 2.5V at 500mA, and guaranteed thermal shutdown at 145°C junction temperature.
Technical Context
The KA7631TS integrates three independent linear regulators with separate input pins (Vin1, Vin2), bandgap reference, and dedicated protection circuitry including overvoltage, short-circuit, and thermal shutdown. Output 1 features an internal reset generator with programmable delay (Trd = (Cd × 2.5)/10µA) and hysteresis (20–100mV).
Outputs 2 and 3 are TTL-controllable: logic-high disable input (Pin 4) forces both into high-impedance state; reset output (Pin 6) sinks current when Vo1 drops below K−0.25V and releases when capacitor voltage exceeds K−0.2V, where K = Vo1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage 1 | 5.1V ±2% - precision rail for microcontroller core supply with <100ppm/°C thermal drift |
| Output Voltage 2 | 9V ±2% - fixed auxiliary rail for analog sensors or interface ICs |
| Output Voltage 3 | 12V ±2% - externally amplified rail supporting up to 1A with PNP transistor |
| Reset Delay Time | 25ms typical with 100nF capacitor - enables configurable power-on reset timing |
| Dropout Voltage | 2.5V max at 500mA - defines minimum headroom required between Vin1/Vin2 and respective outputs |
| Thermal Shutdown | Activates at 145°C junction temperature - protects device during overload or poor heatsinking |
| Quiescent Current | 2mA max with Output 2 disabled - critical for low-power standby modes |
Pinout & Package
KA7631TS is housed in a 10-pin Single-In-Line Package with Heat Sink (10-SIP-H/S), featuring vertical lead orientation and integrated thermal pad for enhanced power dissipation in compact automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin1 | Main input for Output 1 (5.1V) and reset circuitry; requires 7.5–14V |
| 2 | GND | Common ground reference for all regulators and control logic |
| 3 | Output 1 | 5.1V regulated output; supplies core logic or MCU VCC |
| 4 | Disable | TTL-compatible active-high enable/disable for Outputs 2 & 3 |
| 5 | Vin2 | Input for Outputs 2 (9V) and 3 (12V); requires 11.5–18V |
| 6 | RESET | Open-collector reset output; low when Vo1 falls below threshold |
| 7 | Output 2 | 9V regulated output; powers analog subsystems or peripherals |
| 8 | Output 3 | 12V output node - connects to emitter of external PNP transistor |
| 9 | Control | Base drive node for external PNP transistor regulating Output 3 |
| 10 | DEL.CAP | Connection point for external delay capacitor (e.g., 100nF) setting reset timeout |
Key Features
| Feature | Design Value |
|---|---|
| Dual TTL-disable inputs | Single Pin 4 controls enable/disable of both Output 2 and Output 3, simplifying system-level power sequencing |
| Programmable reset delay | External capacitor (e.g., 100nF) sets precise reset pulse width (25ms typ), enabling compatibility with diverse MCU reset timing requirements |
| Independent input rails | Vin1 (for 5.1V) and Vin2 (for 9V/12V) allow separate sourcing - e.g., battery vs. alternator-fed inputs in automotive systems |
| Integrated protection suite | Short-circuit current limit (1.6A), thermal shutdown (145°C), and overvoltage protection prevent latch-up and field failures |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Centralized power management for door locks, window lifts, and lighting drivers in 12V vehicle architectures. IC Role / Device Role / Timing Role: Primary triple-rail regulator supplying 5.1V (MCU), 9V (sensor bias), and 12V (actuator drivers) with synchronized disable and reset signaling. Use Value: Eliminates need for discrete LDOs and reset ICs; reduces BOM count by 3+ components while ensuring coordinated power-up sequencing. | Use Scenario: Local power conditioning for analog input modules in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Provides isolated 5.1V and 9V rails for ADC references and op-amp stages, with 12V output driving relay coils via external transistor. Use Value: Maintains <160mV load regulation across full 5–500mA range, preserving measurement accuracy under varying channel count loads. |
| Medical Diagnostic Sensor Hub | Point-of-Sale Terminal Power Management |
Use Scenario: Compact sensor aggregation unit requiring clean, stable voltages for ECG front-end amplifiers and microcontroller subsystems. IC Role / Device Role / Timing Role: Delivers low-noise 5.1V (digital core) and 9V (precision op-amp bias) with thermal shutdown safeguarding against enclosure overheating. Use Value: 100ppm/°C thermal drift ensures consistent analog gain calibration across 0–125°C operating range. | Use Scenario: Embedded payment terminal with display backlight, EMV card reader, and secure element - all demanding tightly regulated rails. IC Role / Device Role / Timing Role: Generates 5.1V (secure MCU), 9V (backlight LED driver), and 12V (card reader motor) with simultaneous disable during sleep mode. Use Value: 2mA quiescent current in Output 2 disabled state extends battery backup runtime during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0 | Single-output buck converter (5V only); switching topology; no reset or disable features | Lacks multi-rail capability and system-level control signals - suitable only for replacing Output 1 alone | Select only if redesign allows separate regulation for each rail and higher efficiency is prioritized over integration |
| TPS7A4700RGWR | Ultra-low-noise single-channel LDO (±0.5% accuracy); no secondary outputs or reset function | Designed for noise-sensitive analog rails only; cannot replicate KA7631TS's triple-output coordination or TTL disable | Choose when powering high-precision ADCs or RF sections where PSRR > 70dB is mandatory |
Compared with LM2596S-5.0 and TPS7A4700RGWR, the KA7631TS uniquely integrates three regulated outputs with synchronized control, reset generation, and thermal protection in one 10-SIP package - eliminating inter-rail timing mismatches and reducing board space by >40% versus discrete solutions.
Availability
KA7631TS is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, medical sensor hubs, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for KA7631TS 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 manufacturer acquired by ON Semiconductor in 2016; known for robust automotive-grade linear regulators and power management solutions.
The KA7631TS belongs to Fairchild's fixed multi-output regulator product line, designed specifically for cost-sensitive, space-constrained automotive and industrial systems needing coordinated dual- or triple-rail power with built-in system supervision.
FAQ
What is the maximum output current capability of KA7631TS on each regulated rail?
The KA7631TS delivers up to 0.5A continuously on Output 1 (5.1V) and Output 2 (9V). Output 3 (12V) supports up to 1A, but requires an external PNP transistor connected to the CONTROL and OUTPUT 3 pins. The internal circuitry does not source 1A directly - it drives the base of the external transistor to achieve that current level. This architecture maintains thermal safety while extending output capability beyond monolithic limits.
How does the reset function of KA7631TS operate, and what external component is required?
The KA7631TS reset function monitors Output 1 voltage and asserts an open-collector low signal on Pin 6 (RESET) when Vo1 drops below (Vo1 − 0.25V). A 100nF capacitor connected to Pin 10 (DEL.CAP) sets the reset pulse width to 25ms typical. The internal 10µA current source charges the capacitor after fault clearance, and reset deasserts when voltage exceeds (Vo1 − 0.2V). No pull-up resistor is needed unless interfacing with CMOS logic requiring defined high-state voltage.
Can KA7631TS be used with different input voltage sources for its two input pins?
Yes - KA7631TS is explicitly designed for independent input sourcing: Vin1 (Pin 1) powers Output 1 and the reset circuit, while Vin2 (Pin 5) powers Outputs 2 and 3. This allows separate feeds - for example, a stabilized 8V rail for logic (Vin1) and a switched 13.5V alternator-derived rail (Vin2) for actuators - without cross-coupling. The datasheet specifies distinct valid ranges: 7.5–14V for Vin1 and 11.5–18V for Vin2, confirming intentional dual-supply operation.
What thermal protection mechanism does KA7631TS implement, and at what junction temperature does it activate?
The KA7631TS incorporates thermal shutdown protection that activates at a measured junction temperature of 145°C, as specified in the Electrical Characteristics table. When this threshold is exceeded, all outputs are disabled until junction temperature falls below hysteresis margin (~135°C). This protection is implemented via on-die thermal sensing and is independent of external components - no heatsink is required for 0.5A operation at +25°C ambient, though derating applies above 85°C ambient per the package's thermal resistance profile.
Is KA7631TS compatible with standard 10-SIP footprints, and what is its thermal pad configuration?
Yes - KA7631TS uses the industry-standard 10-SIP-H/S package with 2.54mm pin pitch and integrated heat sink tab on the rear side. The mechanical drawing confirms a 13.65mm length, 3.25mm width, and 23.86mm height including leads. The H/S suffix denotes "Heat Sink", meaning the molded case includes a metal thermal pad designed for solder attachment to a copper pour on the PCB. This pad significantly improves thermal performance over non-H/S variants and must be electrically connected to GND (Pin 2) for optimal reliability.
KA7631TS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 10-SIP, 10-SIPH
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 3
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 5.1V, 9V, 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2.5V @ 500mA, 2.5V @ 500mA, -
- Current - Output:
- 500mA, 500mA, 1A
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- Protection Features:
- Over Temperature, Over Voltage, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 10-SIP H/S
KA7631TS FAQ
1.How can I place an order for KA7631TS through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7631TS 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 KA7631TS reliable?
The price and inventory of KA7631TS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7631TS is usually 5 days.
3.What payment methods are accepted for KA7631TS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7631TS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7631TS?
KA7631TS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7631TS 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 KA7631TS?
For technical support, including KA7631TS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7631TS requirements.
6.How does Aetrix verify that KA7631TS is sourced from the original manufacturer or authorized distributors?
All KA7631TS 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 KA7631TS meets industry standards.
7.What is the process for return or replacement of KA7631TS?
All KA7631TS units undergo pre-shipment inspection (PSI). If there is an issue with KA7631TS, 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 KA7631TS part is unused and in its original packaging.
Return procedure for KA7631TS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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