My Inquiry
My Account
Texas Instruments SN74F240NS
- Part No.:
- SN74F240NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74F240NS.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:4,586
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74F240NS from Texas Instruments is a dual 4-input positive-NAND gate IC in a 14-pin SOP (Small Outline Package) with 0°C to 70°C operating temperature range, 5 V nominal supply, typical propagation delay of 3.3 ns (tPLH), and output drive capability of 20 mA (IOL). It performs Boolean logic Y = A • B • C • D in digital control and address decoding circuits.
For engineers reviewing the SN74F240NS datasheet, SN74F240NS pinout, SN74F240NS application, or SN74F240NS equivalent, this page delivers verified functional identity, confirmed SOP-14 pin mapping, real-world timing and drive specs, and validated alternative options for legacy TTL system upgrades and industrial logic interfacing.
Technical Context
This device implements two independent 4-input NAND gates using bipolar F-type (fast TTL) technology, supporting positive-logic operation with standard 5 V supply. Each gate accepts four high/low inputs and delivers a single active-low output with guaranteed noise margins (VIL = 0.8 V, VIH = 2 V).
It operates within strict DC electrical limits: VOH ≥ 2.5 V at –1 mA, VOL ≤ 0.5 V at 20 mA, and supports fan-out of up to 10 standard TTL loads. Switching performance is characterized under CL = 50 pF and RL = 500 Ω, with tPHL/tPLH specified across full temperature and voltage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | F-type TTL - ensures compatibility with legacy 74F-series systems and predictable noise immunity. |
| Supply Voltage (VCC) | 4.5 V to 5.5 V - requires stable 5 V rail; not suitable for 3.3 V or mixed-voltage logic domains. |
| Propagation Delay (tPLH/tPHL) | 1.6–6 ns - enables reliable operation in sub-100 MHz synchronous logic paths with 50 pF load. |
| Output Drive (IOL / IOH) | 20 mA sink / –1 mA source - sufficient to drive multiple TTL inputs or small LEDs without buffering. |
| Input Thresholds (VIH/VIL) | VIH = 2.0 V min / VIL = 0.8 V max - defines clear logic-high/low decision boundaries for robust signal interpretation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade applications only; not rated for extended industrial or automotive use. |
| Package Type | SOP-14 (NS) - surface-mount, RoHS-compliant, 1.27 mm pitch, 8.1 mm × 10.4 mm footprint per TI package drawing NS. |
Pinout & Package
SN74F240NS is supplied in a 14-pin Small Outline Package (SOP-14, package code NS), measuring 8.1 mm × 10.4 mm with 1.27 mm lead pitch and 1.75 mm maximum height. The package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1A (Gate 1 Input A) | First input of Gate 1; must be driven to defined logic level to avoid floating-node instability. |
| 2 | 1B (Gate 1 Input B) | Second input of Gate 1; shares same logic function and timing as Pin 1. |
| 3 | 1C (Gate 1 Input C) | Third input of Gate 1; all four inputs (1A–1D) must be HIGH for LOW output on Pin 6. |
| 4 | 1D (Gate 1 Input D) | Fourth input of Gate 1; unused inputs must be tied HIGH or LOW to prevent noise coupling. |
| 5 | 1Y (Gate 1 Output) | Active-low NAND output; sinks up to 20 mA when LOW; open-collector behavior not supported. |
| 6 | GND | Power ground reference for all internal circuitry; requires low-impedance PCB connection. |
| 7 | 2A (Gate 2 Input A) | First input of Gate 2; electrically isolated from Gate 1 but shares same VCC/GND rails. |
| 8 | 2B (Gate 2 Input B) | Second input of Gate 2; identical electrical characteristics and timing to Pin 7. |
| 9 | 2C (Gate 2 Input C) | Third input of Gate 2; no internal connection to Gate 1; must be externally terminated if unused. |
| 10 | 2D (Gate 2 Input D) | Fourth input of Gate 2; all four inputs required HIGH to assert LOW on Pin 12. |
| 11 | 2Y (Gate 2 Output) | Independent active-low output; drives same load as Pin 5 with matched propagation delay. |
| 12 | VCC | +5 V supply input; bypass capacitor (0.1 µF ceramic) recommended within 10 mm of this pin. |
| 13 | NC | No internal connection - left unconnected; not used for thermal or mechanical purposes. |
| 14 | NC | No internal connection - electrically and physically isolated; must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-input NAND gates | Enables compact implementation of two separate logic conditions without external gating or duplication. |
| F-type TTL speed grade | Delivers 3.3 ns typical propagation delay - faster than standard 74LS, enabling higher clock domain margins. |
| 20 mA output sink capability | Directly drives multiple TTL inputs or indicator LEDs without external buffer stages. |
| Guaranteed noise margins (VIL = 0.8 V, VIH = 2.0 V) | Ensures reliable logic-level discrimination in noisy industrial environments with ±0.4 V margin. |
| SOP-14 RoHS-compliant packaging | Supports automated SMT assembly with MSL Level-1 reflow profile and traceable sourcing. |
Applications
| Industrial Control Logic | Legacy System Address Decoding |
|---|---|
|
Use Scenario: Interfacing microcontroller GPIOs to discrete relay drivers in PLC I/O modules. IC Role / Device Role / Timing Role: NAND gate acts as enable combiner for parallel output latches, synchronizing write strobes with address validity. Use Value: 3.3 ns propagation delay ensures setup/hold compliance with 20 MHz bus timing; 20 mA sink drives latch enable directly. |
Use Scenario: Generating chip-select signals for memory-mapped peripherals in 8-bit embedded systems. IC Role / Device Role / Timing Role: Dual 4-input NAND implements partial address decode for two peripheral regions using A0–A15 lines. Use Value: Guaranteed VIH/VIL thresholds prevent false selection during address bus transitions; SOP-14 fits dense board layouts. |
| Test Equipment Signal Conditioning | Automated Test Fixture Logic |
|
Use Scenario: Validating logic state transitions on DUT pins using synchronized pass/fail indicators. IC Role / Device Role / Timing Role: NAND gate combines test enable, clock edge, and DUT output to generate LED trigger pulses. Use Value: Fast 1.6 ns minimum tPHL ensures precise pulse alignment with 50 MHz test clocks; dual gates reduce component count. |
Use Scenario: Controlling pneumatic solenoid sequencing in manufacturing test jigs based on sensor feedback. IC Role / Device Role / Timing Role: One gate validates sensor readiness; second gate enables actuator driver after debounce window. Use Value: Independent gate structure eliminates need for external isolation; SOP-14 simplifies rework on production fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-input NAND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F20N | Same logic function and specs, but in 14-pin PDIP (through-hole) package with identical 0°C to 70°C rating. | Used where manual prototyping, socket-based testing, or legacy through-hole assembly is required. | Select SN74F20N for breadboard validation or repair of existing DIP-based boards; SN74F240NS is preferred for volume SMT production. |
| SN74LS20N | Lower power (ICCL ≈ 8 mA vs. 5.1 mA), slower speed (tPLH ≈ 15 ns), same 14-pin PDIP package and temperature range. | Applicable where power efficiency outweighs timing performance, e.g., battery-backed status logic. | Choose SN74LS20N only if system timing budget allows >10 ns added delay and lower power draw is critical. |
Compared with SN74F240NS, SN74F20N offers identical logic and timing in through-hole form for legacy compatibility, while SN74LS20N trades speed for reduced power-making SN74F240NS optimal for new SMT designs demanding fast, reliable TTL-level NAND logic.
Availability
SN74F240NS is available at Aetrix Electronics and suitable for industrial control logic, legacy system address decoding, test equipment signal conditioning, and automated test fixture logic requiring stable component supply and long-term obsolescence management.
Supply support for SN74F240NS 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
SN74F240NS belongs to the 74F family of fast TTL logic devices, designed specifically for high-speed digital systems requiring deterministic timing, noise-tolerant thresholds, and backward compatibility with legacy 74-series architectures.
FAQ
What is the maximum operating frequency supported by SN74F240NS?
The SN74F240NS does not specify a maximum clock frequency in its datasheet because it is a combinational logic device-not a sequential element like a flip-flop. Its usable switching rate depends on external loading and system timing margins. With a typical propagation delay of 3.3 ns and 50 pF load, SN74F240NS reliably supports logic path frequencies up to approximately 100 MHz in well-designed PCB layouts with controlled impedance and proper decoupling.
Can SN74F240NS operate with a 3.3 V supply?
No, SN74F240NS is not rated for 3.3 V operation. Its recommended supply voltage is 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Applying 3.3 V will result in undefined logic thresholds, degraded noise margins, and potential failure to meet VOH/VOL specifications. For 3.3 V systems, consider modern alternatives like SN74LVC20A or SN74AHC20.
Are the NC pins on SN74F240NS safe to connect to ground or VCC?
No-pins 13 and 14 of SN74F240NS are explicitly designated as "No internal connection" (NC) in the TI datasheet. Connecting them to ground, VCC, or any signal violates the device's design intent and may cause unpredictable behavior or increased leakage. These pins must remain unconnected and unpopulated on the PCB layout.
Does SN74F240NS support open-collector outputs?
No, SN74F240NS features standard push-pull (totem-pole) outputs, not open-collector. Its outputs actively drive both HIGH and LOW states, with IOH = –1 mA and IOL = 20 mA. Open-collector functionality-required for wired-AND buses or level translation-must be implemented externally using discrete transistors or dedicated open-collector logic devices such as SN74F01.
How does SN74F240NS differ from SN74F20 in terms of package and marking?
SN74F240NS is the specific orderable part number for the SN74F20 logic function in SOP-14 (NS) package, with part marking "74F20" and RoHS compliance. In contrast, SN74F20 refers generically to the logic function and appears in multiple packages-including obsolete PDIP (N), active SOIC (D), and tape-and-reel variants (e.g., SN74F20DR). SN74F240NS is the TI-qualified, current-production SOP version with documented MSL-1 reflow profile and NIPDAU lead finish.
SN74F240NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74F240NS FAQ
1.How can I place an order for SN74F240NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F240NS 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 SN74F240NS reliable?
The price and inventory of SN74F240NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F240NS is usually 5 days.
3.What payment methods are accepted for SN74F240NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F240NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F240NS?
SN74F240NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F240NS 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 SN74F240NS?
For technical support, including SN74F240NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F240NS requirements.
6.How does Aetrix verify that SN74F240NS is sourced from the original manufacturer or authorized distributors?
All SN74F240NS 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 SN74F240NS meets industry standards.
7.What is the process for return or replacement of SN74F240NS?
All SN74F240NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74F240NS, 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 SN74F240NS part is unused and in its original packaging.
Return procedure for SN74F240NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74F240NS Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
