SN54LS05 - Military 6-ch Open-Collector Inverter | TI
MPN: SN54LS05 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
SN54LS05 Overview
An inverter is a logic gate that outputs the logical complement of its input. The SN54LS05 specifically features open-collector outputs, meaning the output transistor's collector is left unconnected internally, requiring an external pull-up resistor to define the high-level output voltage. This allows the device to interface with different voltage domains and to implement wired-OR logic by connecting multiple outputs together. Open-collector outputs also enable driving loads such as relays, LEDs, and lamps directly, with appropriate current limiting.
Key features include six independent inverters, a wide operating temperature range of -55°C to 125°C, and compatibility with TTL logic levels. The open-collector outputs can sink up to 8 mA, and the device supports a supply voltage range of 4.5 V to 5.5 V. The military-grade qualification ensures reliability in defense and aerospace applications.
Technically, the SN54LS05 uses bipolar junction transistor (BJT) technology, providing fast switching speeds and robust output drive. The open-collector design allows for level shifting and bus communication, making it versatile for various logic interfacing tasks. The device is available in a 14-pin CDIP package, which offers excellent thermal and mechanical stability.
Typical applications include military electronics, industrial control systems, and any design requiring high-voltage or high-current logic interfacing. The SN54LS05 is often used to drive relays, lamps, and other loads, as well as to implement wired-OR logic in bus systems.
When designing with this device, ensure that pull-up resistors are properly sized to limit output current and to achieve the desired switching speed. The open-collector outputs require external pull-ups to VCC or another voltage rail, and the resistor value should be chosen based on the load capacitance and required rise time.
Drop-in alternatives for SN54LS05 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN54S05
✅ Drop-In📋 Reference alternative (not in catalog)
SN74LS05
✅ Drop-In📋 Reference alternative (not in catalog)
SN74S05
✅ Drop-In📋 Reference alternative (not in catalog)
MC54LS05
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC74LS05
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN54LS05 Maximum Ratings & Electrical Characteristics
| Number of Channels | 6 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Output Type | Open Collector |
| Logic Family | LS |
| Operating Temperature Range | -55°C to 125°C |
| Package Type | 14-CDIP |
| Mounting Type | Through Hole |
| Output Current (Sink) | 8 mA |
| Input Voltage (High) | 2 V (min) |
| Input Voltage (Low) | 0.8 V (max) |
| RoHS Status | Compliant |
| Military Grade | Yes |
| Number of Pins | 14 |
| Technology | Bipolar |
SN54LS05 Pin Configuration
| Pin 1 | 1A — Input of inverter 1 |
| Pin 2 | 1Y — Output of inverter 1 (open-collector) |
| Pin 3 | 2A — Input of inverter 2 |
| Pin 4 | 2Y — Output of inverter 2 (open-collector) |
| Pin 5 | 3A — Input of inverter 3 |
| Pin 6 | 3Y — Output of inverter 3 (open-collector) |
| Pin 7 | GND — Ground |
| Pin 8 | 4Y — Output of inverter 4 (open-collector) |
| Pin 9 | 4A — Input of inverter 4 |
| Pin 10 | 5Y — Output of inverter 5 (open-collector) |
| Pin 11 | 5A — Input of inverter 5 |
| Pin 12 | 6Y — Output of inverter 6 (open-collector) |
| Pin 13 | 6A — Input of inverter 6 |
| Pin 14 | VCC — Positive supply voltage (4.5V to 5.5V) |
Typical Applications
SN54LS05 is suitable for 6 applications: Military Electronics, Industrial Control Systems, Wired-OR Logic, Level Shifting, Relay and Lamp Driving, Avionics and Aerospace.
Military Electronics
The SN54LS05 is designed for military-grade applications requiring reliable operation over -55°C to 125°C. Its open-collector outputs allow interfacing with high-voltage loads and implementing wired-OR logic in avionics and defense systems. The device's bipolar technology ensures robust performance in harsh environments, and its 8 mA sink capability can drive relays and indicators directly.
Recommended
Industrial Control Systems
In industrial control, the SN54LS05 is used for logic-level conversion and driving loads such as relays and lamps. Its open-collector outputs can be pulled up to different voltages, enabling level shifting between 5-V logic and 24-V industrial signals. The wide temperature range and military-grade reliability make it suitable for factory automation and process control.
Recommended
Wired-OR Logic
The SN54LS05's open-collector outputs allow multiple outputs to be connected together to implement wired-OR logic. This is useful in bus systems where multiple devices need to share a common line. The device can sink current from the bus, and an external pull-up resistor sets the high level. This configuration is common in interrupt lines and status signals.
Recommended
Level Shifting
The SN54LS05 can shift logic levels between different voltage domains. By connecting the pull-up resistor to a higher voltage rail, the open-collector output can produce a high-level voltage that is higher than the device's supply. This enables interfacing 5-V logic with 12-V or 24-V systems, making it useful in mixed-voltage designs.
Recommended
Relay and Lamp Driving
The open-collector outputs of the SN54LS05 can directly drive relays, lamps, and LEDs when the current is within the 8 mA sink capability. For higher currents, an external transistor or a driver IC like the ULN2803 can be used. The device's wide temperature range makes it suitable for automotive and industrial lighting applications.
Recommended
Avionics and Aerospace
The SN54LS05 is qualified for military and aerospace applications, where reliability and wide temperature operation are critical. It is used in flight control systems, navigation equipment, and communication interfaces. The 14-CDIP package provides robust mechanical integrity, and the bipolar technology ensures consistent performance under extreme conditions.
Recommended
Recommended Products Summary
Engineering reference data for SN54LS05 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN54S05 | SN74LS05 | SN74S05 | MC54LS05 | MC74LS05 |
|---|---|---|---|---|---|---|
| Package | 14-CDIP | 14-CDIP | 14-SOIC | 14-SOIC | 14-CDIP | 14-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Motorola | Motorola |
| Number of Channels | 6 | 6 | 6 | 6 | 6 | 6 |
| Supply Voltage Range | 4.5V to 5.5V | 4.5V to 5.5V | 4.75V to 5.25V | 4.75V to 5.25V | 4.5V to 5.5V | 4.75V to 5.25V |
| Output Type | Open Collector | Open Collector | Open Collector | Open Collector | Open Collector | Open Collector |
| Operating Temperature Range | -55°C to 125°C | -55°C to 125°C | 0°C to 70°C | 0°C to 70°C | -55°C to 125°C | 0°C to 70°C |
| Output Current (Sink) | 8 mA | 20 mA | 8 mA | 20 mA | 8 mA | 8 mA |
Key Differentiators
- Military-grade temperature range (vs SN74LS05)
- Higher output sink current (vs SN54S05)
- Lower power consumption (vs SN54S05)
Design Notes
Open-collector outputs require external pull-up resistors. Without them, the output cannot go high, and the logic level will be undefined. Choose pull-up resistor values based on the load capacitance and required rise time; typical values range from 1kΩ to 10kΩ.
For high-speed operation, keep pull-up resistors close to the device and minimize trace length to reduce parasitic capacitance. Use a ground plane to provide a low-impedance return path and reduce noise. Decouple the VCC pin with a 0.1µF ceramic capacitor placed as close as possible to the pin.
The SN54LS05 is specified for -55°C to 125°C. In high-temperature environments, ensure adequate airflow or heatsinking if driving multiple outputs at maximum current. The 14-CDIP package has a thermal resistance of approximately 100°C/W, so power dissipation should be limited to avoid exceeding the maximum junction temperature.
Compliance Information
RoHS compliant per TI product page. Military-grade, not AEC-Q100 qualified.
