SN74LS26NE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
SN74LS26NE4 is a quad 2-input high-voltage NAND gate from Texas Instruments in the 74LS logic family with open-collector outputs, 14-pin DIP package, and 8 mA output sink current. It is designed for 5 V TTL systems requiring bus-compatible wired-AND logic and direct interfacing to higher-voltage loads.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS26NE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS26NE4?
- 4 independent 2-input NAND gates in a 14-pin DIP package
- High-voltage open-collector outputs for wired-AND bus interfacing
- 8 mA output sink current supports direct LED and relay driving
- 74LS family with 5 V TTL-compatible input thresholds
- 15 pF specified load capacitance for predictable propagation delay
- Pb-free construction compliant with RoHS requirements
What is SN74LS26NE4 used for?
SN74LS26NE4 is used in 5 V TTL logic systems for bus arbitration, chip-select decoding, and enable logic where open-collector NAND outputs allow multiple gate outputs to share a common wire without bus contention. It also serves in legacy industrial control panels, relay drive circuits, and educational breadboard prototypes where the through-hole 14-pin DIP package is preferred for ease of hand-assembly and testing.
What are the specifications of SN74LS26NE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Family | LS |
| JESD-30 Code | R-PDIP-T14 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Logic IC Type | NAND GATE |
| Max I(ol) | 0.008A |
| Number of Functions | 4 |
| Number of Inputs | 2 |
| Output Characteristics | OPEN-COLLECTOR |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP14,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Power Supply Current-Max (ICC) | 4.4mA |
| Prop. Delay@Nom-Sup | 32ns |
| Propagation Delay (tpd) | 28ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74LS26NE4 datasheet?
SN74LS26NE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS26NE4?
Compatible alternatives and drop-in replacements for SN74LS26NE4:
Frequently Asked Questions
How does the high-voltage open-collector output of SN74LS26NE4 differ from a standard TTL output?
Standard TTL totem-pole outputs include an active pull-up transistor that drives the line high and can source current up to several milliamps. The SN74LS26NE4's open-collector output omits that pull-up, so the output only actively pulls low, sinking up to 8 mA, while a wired bus requires an external pull-up resistor to VCC or a higher voltage rail up to the device's maximum collector voltage.
Can SN74LS26NE4 be used to drive a 12 V relay coil directly from a 5 V logic system?
Yes, because the open-collector outputs are rated for a higher collector voltage than the 5 V supply, a 12 V relay coil can be connected between the 12 V rail and the open-collector output through a flyback diode. The 8 mA sink current is modest, so a small transistor stage is typically added if the relay requires more than 8 mA, but low-current reed relays can be driven directly.
In which legacy digital system maintenance scenarios is the SN74LS26NE4 still the preferred choice?
When servicing older industrial PLCs, CNC controllers, or test equipment from the 1980s and 1990s that use 74LS-family logic on 5 V backplanes, the SN74LS26NE4 is the direct electrical and pinout replacement for the original quad NAND gate with open-collector outputs. Its 14-pin DIP package allows direct insertion into existing sockets without board modification, preserving the original 5 V TTL timing and drive characteristics.
How many NAND gate functions can SN74LS26NE4 provide and at what propagation delay?
The IC contains 4 independent 2-input NAND gates, each with its own open-collector output, enabling 4 simultaneous logic functions in a single 14-pin package. Typical 74LS propagation delay is approximately 9 ns to 15 ns depending on load, and with the 15 pF specified load capacitance the timing is predictable enough for most combinational logic paths operating below 50 MHz clock frequencies.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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