My Inquiry
My Account
Texas Instruments SN74HC240DGSR
- Part No.:
- SN74HC240DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74HC240DGSR.pdf
- Description:
- 8-CH, 2V TO 6V INVERTERS WITH 3-
- Quantity:
- Payment:
- Shipping:
Inventory:4,273
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC240DGSR from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus driving applications. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 9ns (VCC = 4.5V, CL = 50pF), and consumes ≤80µA ICC. Its dual 4-bit architecture supports independent output-enable control for high-density bus interfacing.
For engineers reviewing the SN74HC240DGSR datasheet, SN74HC240DGSR pinout, SN74HC240DGSR application, or SN74HC240DGSR equivalent, key selection criteria include 3-state bus contention management, VSSOP-20 thermal performance (RθJA = 130.6°C/W), inverted logic polarity per channel, and compatibility with LSTTL load levels (up to 15 loads).
Technical Context
The SN74HC240DGSR implements two independent 4-bit inverting buffer sections, each with dedicated active-low output-enable (OE) inputs (Pin 1 and Pin 19). When OE is low, data passes from A-inputs to Y-outputs with inversion; when OE is high, all eight outputs enter high-impedance state-enabling bidirectional bus sharing without external isolation.
Its CMOS HCMOS process ensures rail-to-rail input thresholds (VIH = 3.15V, VIL = 1.35V at VCC = 4.5V), low input current (≤1µA), and robust noise immunity. The device meets JEDEC JESD78 Class II latch-up immunity and supports operation across –40°C to +125°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - Enables direct interface with 3.3V and 5V systems without level shifters. |
| Output Drive Capability | ±6mA at 5V - Sufficient to drive 15 LSTTL loads, supporting legacy TTL bus termination. |
| Propagation Delay (tpd) | 9ns typical (VCC = 4.5V, CL = 50pF) - Enables reliable operation in sub-100MHz address/data strobe timing paths. |
| Quiescent Current (ICC) | 80µA max - Minimizes standby power in battery-backed or energy-sensitive embedded controllers. |
| Input Leakage Current | 1µA max - Ensures stable logic states even with high-impedance pull-ups or long PCB traces. |
| 3-State Enable/Disable Time | ten = 32ns, tdis = 32ns (VCC = 6V, CL = 50pF) - Supports fast bus arbitration cycles in multiprocessor or DMA environments. |
Pinout & Package
VSSOP-20 package (DGS): 5.1mm × 4.9mm body size, 0.65mm lead pitch, 1.0mm max height - optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - independently disable Group 1 (Pins 2–9) or Group 2 (Pins 11–18) outputs to isolate bus segments. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Inverting input terminals - accept TTL/CMOS logic signals; internal inversion occurs before output stage. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs - present inverted A-input data when OE is low; float to high-Z when OE is high. |
| 10 | GND | Ground reference - must be connected to system ground plane for noise immunity and proper logic threshold definition. |
| 20 | VCC | Power supply - requires local 0.1µF ceramic bypass capacitor placed within 3mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffers | Dual 4-bit groups enable selective bus loading and prevent contention during shared-memory access. |
| Wide supply range (2V–6V) | Supports mixed-voltage designs: interoperability between 3.3V microcontrollers and 5V peripherals without voltage translation. |
| Low ICC (≤80µA) | Reduces system-level quiescent power - critical for always-on industrial I/O modules and remote sensor nodes. |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., 3.15V/1.35V at 4.5V), ensuring robust operation in electrically noisy factory-floor environments. |
| JEDEC-standard SOIC footprint compatibility | VSSOP-20 pinout matches SOIC-20 mechanical layout - allows drop-in replacement in existing layouts with minor trace adjustments. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 20-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating address latches during write cycles to prevent bus contention. Use Value: Eliminates need for discrete pull-up resistors and enables simultaneous read/write arbitration via OE control. |
Use Scenario: Interfacing a PLC CPU module with field I/O expansion racks over a parallel backplane bus. IC Role / Device Role / Timing Role: Bidirectional bus driver managing direction control through synchronized OE signals from master controller. Use Value: Provides deterministic signal integrity across 1m backplane traces at 10MHz clock rates with <10ns skew. |
| Legacy System Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Adapting modern ARM-based test controller outputs to legacy GPIB or IEEE-488 bus receivers requiring LSTTL-compatible drive strength. IC Role / Device Role / Timing Role: Level-shifting and load-driving buffer converting 3.3V CMOS logic to 5V LSTTL-compliant signals. Use Value: Delivers 15-LSTTL load capability without external transistors, reducing BOM count and board area. |
Use Scenario: Isolating DUT signal paths in automated test equipment to prevent cross-talk between stimulus and measurement channels. IC Role / Device Role / Timing Role: 3-state gate controlling signal routing between FPGA pattern generator and DUT input pins. Use Value: Enables nanosecond-precision signal gating with <32ns enable/disable latency, critical for jitter-sensitive measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240DBR | CMOS-TTL compatible inputs (VIH = 2.0V min), identical output drive and timing. | Better suited for mixed 5V TTL/CMOS systems where input thresholds must match legacy TTL logic families. | Select when interfacing directly with 5V TTL outputs without level shifters; same VSSOP-20 footprint. |
| 74LVC240APW | Lower VCC range (1.65V–3.6V), higher speed (tpd = 5.2ns @ 3.3V), ±24mA drive. | Optimized for 3.3V-only portable and high-speed digital systems; not 5V-tolerant. | Choose for next-gen low-voltage designs requiring faster propagation and higher sink/source current. |
Compared with SN74HC240DGSR, SN74HCT240DBR offers guaranteed TTL-compatible inputs for legacy integration, while 74LVC240APW provides superior speed and drive in 3.3V domains but sacrifices 5V operation-making SN74HC240DGSR the optimal choice for wide-voltage flexibility and industrial temperature range (–40°C to +125°C).
Availability
SN74HC240DGSR is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy interface adapters requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.
Supply support for SN74HC240DGSR 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 logic solutions, with decades of heritage in high-reliability logic families.
The SN74HC240DGSR belongs to TI's HC (High-Speed CMOS) logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial, automotive, and communications infrastructure applications.
FAQ
What is the operating temperature range for the SN74HC240DGSR?
The SN74HC240DGSR is rated for operation from –40°C to +125°C ambient temperature. This extended industrial range makes it suitable for deployment in harsh environments such as factory automation controllers, motor drives, and outdoor telecommunications equipment where thermal stability is critical. The VSSOP-20 package maintains electrical performance across this full range without derating.
Does the SN74HC240DGSR support 5V logic systems?
Yes, the SN74HC240DGSR fully supports 5V logic systems. Its recommended operating voltage range includes 5V (2V–6V), and its output drive capability of ±6mA at 5V meets LSTTL load requirements. Input thresholds scale with VCC, ensuring reliable recognition of 5V TTL-compatible signals without external level shifting.
How does the 3-state functionality work on the SN74HC240DGSR?
The SN74HC240DGSR features two independent active-low output-enable inputs (1OE on Pin 1 and 2OE on Pin 19). When either OE is low, its corresponding four outputs (e.g., 1Y1–1Y4 for 1OE) drive inverted data from their A-inputs; when high, those outputs enter high-impedance state. This allows dynamic bus sharing between multiple drivers without hardware contention.
What is the maximum capacitive load the SN74HC240DGSR can drive reliably?
The SN74HC240DGSR is characterized for CL = 50pF and CL = 150pF loads in its switching specifications. At CL = 150pF and VCC = 6V, typical propagation delay remains ≤38ns, confirming stable operation into moderate bus capacitance. For heavier loads (>200pF), layout optimization (short traces, ground planes) and reduced edge rates are recommended to maintain signal integrity.
Is the SN74HC240DGSR pin-compatible with other packages in the SN74HC240 family?
Yes, the SN74HC240DGSR shares identical pinout and function mapping with all SN74HC240 variants-including SOIC (DW), SSOP (DB), TSSOP (PW), and PDIP (N) packages. The VSSOP-20 (DGS) footprint aligns mechanically with SOIC-20 for layout reuse, though solder pad dimensions differ; migration requires PCB land pattern adjustment but no schematic change.
SN74HC240DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74HC240DGSR FAQ
1.How can I place an order for SN74HC240DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC240DGSR 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 SN74HC240DGSR reliable?
The price and inventory of SN74HC240DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC240DGSR is usually 5 days.
3.What payment methods are accepted for SN74HC240DGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC240DGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC240DGSR?
SN74HC240DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC240DGSR 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 SN74HC240DGSR?
For technical support, including SN74HC240DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC240DGSR requirements.
6.How does Aetrix verify that SN74HC240DGSR is sourced from the original manufacturer or authorized distributors?
All SN74HC240DGSR 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 SN74HC240DGSR meets industry standards.
7.What is the process for return or replacement of SN74HC240DGSR?
All SN74HC240DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC240DGSR, 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 SN74HC240DGSR part is unused and in its original packaging.
Return procedure for SN74HC240DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC240DGSR 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…
