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Texas Instruments UC27131N
- Part No.:
- UC27131N
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UC27131N.pdf
- Description:
- IC PWR SWITCH BIPOLAR 1:1 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,936
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Product details
Overview
UC27131N from Texas Instruments is a low-side smart power switch IC designed for industrial load control, featuring 300mA continuous output current, 8V–65V operating voltage range, and integrated short-circuit/overload protection. It operates in an 8-pin PDIP package, drives resistive or inductive loads with 1.2V typical saturation voltage at 25°C, and uses a 6V internal reference to support 5V logic-compatible input control.
For engineers reviewing the UC27131N datasheet, UC27131N pinout, UC27131N application, or UC27131N equivalent, this device serves as a robust, programmable low-side switch for automotive body electronics, PLC I/O modules, and industrial solenoid drivers-where VCC interruption tolerance, LED fault indication, and current-sense-based protection are critical design requirements.
Technical Context
The UC27131N implements a composite PNP/NPN output stage optimized for low-side switching, with internal 72V zener clamping between LS and GND to safely dissipate inductive kickback. Its fault logic uses a single external capacitor (CDEL) to program both turn-on delay and VCC interruption recovery timing, enabling configurable power-up sequencing and transient immunity.
Current limiting is set via an external resistor (RCSL) tied between CSL and GND, triggering shutdown when voltage drop exceeds 150mV-corresponding to 250–400mA threshold depending on temperature. The device integrates a 6V bandgap reference (±0.2V over –40°C to +85°C), 3V input comparator threshold (1/2 VREF), and fixed 30% hysteresis, eliminating need for external feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 8V to 65V - supports wide-input industrial and automotive battery-supplied systems without external regulation. |
| Continuous Output Current | 300mA - sufficient for driving relays, small solenoids, and LED arrays directly from logic-level control. |
| Saturation Voltage (VCE(sat)) | 1.2V @ 25°C, RLOAD = 100Ω - minimizes conduction loss and thermal stress in sustained on-state operation. |
| Short-Circuit Protection Threshold | 250–400mA - programmable via RCSL resistor; triggers low-duty-cycle pulsing mode to prevent thermal runaway. |
| CDEL Timing Control | Capacitor-programmable turn-on delay (9.5–13.5ms) and VCC interruption recovery - enables deterministic power sequencing in noisy environments. |
| LED Fault Indicator | Open-collector output sinking 5–11mA - provides direct visual status of output state and fault conditions without added circuitry. |
| Reference Voltage (VREF) | 6.0V ±0.2V - stable internal bandgap reference powering external bias networks and comparator thresholds. |
Pinout & Package
UC27131N is housed in an 8-pin plastic dual in-line package (PDIP), pin-compatible with industry-standard DIP-8 footprints. Thermal performance is rated per TI's packaging specifications for through-hole mounting with adequate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Comparator Signal | Logic-level enable input; switches at 3.0V threshold (1/2 VREF); 5µA bias current allows direct MCU GPIO connection. |
| 2 (GND) | Ground Reference | Common return for internal reference, comparator, and fault logic; must be low-impedance path to minimize noise coupling. |
| 3 (VCC) | Power Supply Input | Primary supply rail (8–65V); requires local ceramic decoupling to suppress transients during switching events. |
| 4 (CSL) | Low-Side Current Sense | Connects to GND via RCSL resistor; senses load current by monitoring voltage drop across RCSL (150mV trip point). |
| 5 (QOUT) | Output Driver Collector | Switched low-side output terminal; connects directly to load; internally clamped to 72V above GND for inductive flyback. |
| 6 (VREF) | 6V Regulated Reference | Stable 6V output sourcing up to 8mA; used for external biasing or as precision reference for auxiliary circuits. |
| 7 (LED) | Fault Status Output | Open-drain indicator; pulled low during output off/fault states; sinks 5–11mA for direct LED drive. |
| 8 (CDEL) | Delay Timing Capacitor | Connects external capacitor to set both turn-on delay and VCC interruption recovery time; charge/discharge currents are 4µA/94µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 72V Zener Clamp | Eliminates need for external flyback diodes when driving inductive loads, reducing BOM count and board space. |
| Programmable VCC Interruption Recovery | Single CDEL capacitor sets both power-loss detection window and restart delay-critical for brownout resilience in factory automation. |
| Fixed 30% Input Hysteresis | Prevents chatter during slow-rising or noisy control signals; ensures clean, bounce-free switching without external Schmitt triggers. |
| Internal 6V Bandgap Reference | Provides stable, temperature-compensated (≤200ppm/°C) reference for external analog functions or sensor biasing. |
| Low Quiescent Current (2mA) | Enables use in always-on systems such as security panels or remote sensors where standby power budget is constrained. |
Applications
| Industrial PLC Output Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Driving 24V solenoid valves and indicator lamps in modular I/O racks subject to EMI and supply transients. IC Role / Device Role / Timing Role: Low-side switch providing isolated load control with built-in short-circuit recovery and LED status feedback. Use Value: Eliminates discrete protection components while maintaining <10ms fault response and supporting hot-swap capability via CDEL timing. |
Use Scenario: Controlling door locks, seat heaters, and interior lighting in 12V vehicle electrical systems with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Smart load driver with integrated current sensing and VCC brownout immunity for reliable operation during cranking. Use Value: Reduces system-level failure rate by autonomously cycling during overload instead of latching off-improving functional safety compliance. |
| Smart HVAC Actuator Interface | Medical Infusion Pump Motor Driver |
Use Scenario: Switching 24V DC motors and position feedback solenoids in commercial HVAC dampers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Low-side power switch with temperature-stable current limit and LED fault signaling for field service diagnostics. Use Value: Maintains consistent 250–400mA trip threshold across –40°C to +85°C, avoiding false trips in cold-start or high-heat environments. |
Use Scenario: Driving small DC motors and solenoid valves in battery-powered infusion pumps requiring precise current limiting and fail-safe shutdown. IC Role / Device Role / Timing Role: Protected low-side driver with programmable turn-on delay to synchronize motor start with pressure sensor initialization. Use Value: Enables deterministic startup sequence via CDEL capacitor, preventing mechanical shock during fluid priming phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-side smart switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC27131D | Same silicon die, SOIC-8 package; RoHS-compliant green finish; MSL Level-2 moisture sensitivity. | Surface-mount assembly compatible; better thermal dissipation than PDIP under forced-air cooling. | Select UC27131D for new SMT designs; UC27131N remains viable for through-hole prototyping or legacy repair. |
| TPL7407L | 7-channel NMOS array; 500mA per channel; no integrated current sense or CDEL timing; 5V-only VCC. | Lacks programmable fault recovery, VCC interruption handling, and 6V reference; suited for simple digital loads only. | Choose TPL7407L only for cost-sensitive, non-fault-critical multi-load applications where UC27131N's protection features are unnecessary. |
Compared with UC27131D, UC27131N offers identical electrical performance but requires through-hole assembly and lacks RoHS certification; compared with TPL7407L, UC27131N delivers superior fault intelligence and wide-voltage operation at the cost of channel count and integration density.
Availability
UC27131N is available at Aetrix Electronics and suitable for industrial PLC output modules, automotive body control units, and smart HVAC actuator interfaces requiring stable component supply and long-term obsolescence management.
Supply support for UC27131N 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of experience in industrial and automotive-grade IC design.
The UC27131N belongs to TI's UCx713x smart power switch family, engineered specifically for ruggedized low-side load control in harsh environments-emphasizing fault resilience, wide input voltage tolerance, and minimal external component count.
FAQ
What is the maximum continuous output current rating for UC27131N?
The UC27131N supports 300mA continuous output current at 25°C ambient, derating to 250mA at 85°C per TI's absolute maximum ratings and electrical characteristics tables. This rating assumes proper PCB copper area and airflow; peak current capability reaches 700mA for short durations under defined test conditions.
Does UC27131N support high-side switching configurations?
No, UC27131N is exclusively a low-side switch. Its internal architecture and pinout (including dedicated CSL pin and LS output) are designed only for load-to-VCC configurations. For high-side operation, TI specifies UC27133 or UC27132 variants-UC27131N cannot be reconfigured or adapted for high-side use.
How is overcurrent protection configured on UC27131N?
Overcurrent protection on UC27131N is set using an external resistor (RCSL) connected between the CSL pin and GND. A 150mV voltage drop across RCSL triggers shutdown; for example, a 0.5Ω resistor yields a 300mA threshold. The device then enters low-duty-cycle pulsing mode until fault clearance, as confirmed in the SLUS340 datasheet's Electrical Characteristics table.
What is the function of the CDEL pin on UC27131N?
The CDEL pin on UC27131N accepts an external capacitor that programs both the output turn-on delay (9.5–13.5ms typical) and the VCC interruption recovery time. Charging (4µA) and discharging (94µA) currents through this capacitor determine timing behavior, enabling robust operation during brownouts without external timers or microcontroller intervention.
Is UC27131N still actively manufactured and supported by Texas Instruments?
Per TI's Package Option Addendum (March 2016), UC27131N is marked "OBSOLETE" - production has been discontinued. However, Aetrix Electronics maintains legacy inventory and supports lifecycle management, including traceable sourcing and cross-reference assistance for migration paths like UC27131D or newer alternatives.
UC27131N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- Low Side
- Output Type:
- Bipolar
- Interface:
- On/Off
- Voltage - Load:
- 8V ~ 65V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 300mA
- Rds On (Typ):
- -
- Input Type:
- Non-Inverting
- Features:
- -
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
UC27131N FAQ
1.How can I place an order for UC27131N through Aetrix?
Please submit a Request for Quotation (RFQ) for UC27131N 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 UC27131N reliable?
The price and inventory of UC27131N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC27131N is usually 5 days.
3.What payment methods are accepted for UC27131N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC27131N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC27131N?
UC27131N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC27131N 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 UC27131N?
For technical support, including UC27131N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC27131N requirements.
6.How does Aetrix verify that UC27131N is sourced from the original manufacturer or authorized distributors?
All UC27131N 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 UC27131N meets industry standards.
7.What is the process for return or replacement of UC27131N?
All UC27131N units undergo pre-shipment inspection (PSI). If there is an issue with UC27131N, 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 UC27131N part is unused and in its original packaging.
Return procedure for UC27131N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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