My Inquiry
My Account
Texas Instruments SN74AHCT16240DLR
- Part No.:
- SN74AHCT16240DLR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT16240DLR.pdf
- Description:
- IC BUFFER INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,145
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHCT16240DLR from Texas Instruments is a 16-bit inverting buffer/driver with 3-state outputs, designed for memory address and bus interface applications in industrial and embedded systems. It operates from –40°C to 85°C, supports 4.5 V–5.5 V supply, delivers ±8 mA output drive, and features TTL-compatible inputs with symmetrical active-low OE controls per 4-bit section.
For engineers reviewing the SN74AHCT16240DLR datasheet, SN74AHCT16240DLR pinout, SN74AHCT16240DLR application, or SN74AHCT16240DLR equivalent, key selection criteria include 3-state timing (tPZH/tPLZ ≤ 12 ns at 50 pF), low-noise distributed VCC/GND layout, flow-through pin architecture, and SSOP-48 package compatibility with legacy board designs.
Technical Context
This device implements four independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. All inputs accept TTL-level voltages (VIH = 2 V, VIL = 0.8 V), enabling direct interfacing with legacy 5-V logic families without level translation.
Its EPIC™ (Enhanced-Performance Implanted CMOS) process ensures latch-up immunity >250 mA (JESD 17) and ESD protection >2000 V (MIL-STD-883, Method 3015). The SSOP-48 (DL) package features distributed power/ground pins to minimize high-speed switching noise and supports flow-through PCB routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V rail tolerances. |
| Output Drive | ±8 mA - Sufficient to drive 50-pF loads with <12 ns enable/disable times. |
| Propagation Delay | tPLH/tPHL ≤ 9.5 ns @ 50 pF - Enables reliable 100+ MHz bus operation. |
| Input Compatibility | TTL voltage thresholds (VIH = 2 V, VIL = 0.8 V) - Direct interface with 74LS/74F logic. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade environmental stress. |
| 3-State Leakage | IOZ ≤ ±2.5 µA @ 5.5 V - Prevents signal contention during high-impedance state. |
| Power Dissipation | Cpd = 10 pF - Low dynamic power for dense bus-driver layouts. |
Pinout & Package
SN74AHCT16240DLR uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 12.6 mm × 6.1 mm body, 0.635 mm pitch, JEDEC MO-153 compliant. Pin 1 marked via corner chamfer; gage plane defined per MTSS003D mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output-enable control | Independent enables per 4-bit section; tie to VCC via pullup for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4, etc. | Input terminals (16 total) | TTL-compatible inputs; all unused inputs must be tied to VCC or GND. |
| 1Y1–1Y4, 2Y1–2Y4, etc. | Inverting 3-state outputs (16 total) | Outputs reflect inverted input logic when corresponding OE is low; high-Z when OE high. |
| VCC (pins 7, 21, 34, 48) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve PDN stability. |
| GND (pins 4, 10, 15, 27, 32, 40) | Ground reference | Six GND pins provide low-inductance return paths for high-frequency switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Input and output pins arranged on opposite sides of package to simplify layer routing and minimize trace crossovers. |
| Distributed VCC/GND pins | Four VCC and six GND pins placed strategically to suppress ground bounce and supply rail collapse during fast switching. |
| EPIC™ process technology | Enables latch-up immunity >250 mA and robust ESD tolerance (>2 kV HBM) without external protection. |
| TTL-input compatibility | Eliminates need for level-shifting circuitry when interfacing with legacy 5-V logic families. |
| Widebus™ family integration | Ensures consistent timing, drive strength, and noise margins across TI's 16-bit bus interface portfolio. |
Applications
| Memory Address Buffering | System Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or Flash memory in an industrial PLC. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address bus from memory array; enables shared bus arbitration via OE control. Use Value: Delivers sub-10 ns propagation delay and ±8 mA drive to meet tight setup/hold timing at 20-MHz bus speeds. | Use Scenario: Bidirectional data path conditioning between FPGA and peripheral ASIC in a test instrumentation platform. IC Role / Device Role / Timing Role: Direction-controlled 16-bit driver/receiver; OE signals synchronized to FPGA control logic for clean bus turnaround. Use Value: 12 ns max enable/disable time prevents bus contention during direction switching under 50-pF load conditions. |
| Clock Distribution Fanout | Legacy Logic Interface Bridge |
Use Scenario: Distributing a 5-V clock signal from a system controller to multiple synchronous peripherals in factory automation hardware. IC Role / Device Role / Timing Role: Inverting buffer with 3-state capability used as fanout driver; OE grounded for always-on operation. Use Value: Symmetrical rise/fall times and low skew (<1 ns) maintain clock integrity across 16 parallel loads. | Use Scenario: Interfacing modern microcontrollers with legacy 74LS-based control logic in retrofitted avionics subsystems. IC Role / Device Role / Timing Role: Level-translation and drive-strengthening buffer; accepts LS-compatible inputs and drives CMOS loads. Use Value: TTL-input thresholds (2 V/0.8 V) ensure reliable recognition of LS logic levels without external biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT16244DLR | Non-inverting output logic; identical pinout, timing, and electrical specs. | Required where signal polarity must be preserved (e.g., non-inverting bus drivers). | Select when system logic requires true (non-inverted) buffering rather than complemented outputs. |
| SN74LVC16244ADGGR | Lower 3.3-V supply range (1.65–3.6 V); higher speed (tPD ≤ 5.3 ns); different pinout. | Used in mixed-voltage 3.3-V systems; not drop-in compatible due to voltage and pin assignment mismatch. | Choose only for new 3.3-V designs requiring faster timing; requires PCB redesign and level-shifting for 5-V interfaces. |
Compared with SN74AHCT16244DLR, SN74AHCT16240DLR provides inverted outputs essential for address decoding pipelines, while SN74LVC16244ADGGR offers superior speed and lower voltage operation but mandates full schematic and layout revision due to incompatible supply and pin mapping.
Availability
SN74AHCT16240DLR is available at Aetrix Electronics and suitable for industrial control systems, memory expansion modules, and legacy bus interface designs requiring stable component supply and long-term obsolescence management.
Supply support for SN74AHCT16240DLR 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT16240DLR belongs to TI's Widebus™ family of high-density bus interface ICs, engineered specifically for noise-immune, high-speed memory addressing and system bus driving in industrial and commercial applications.
FAQ
What is the recommended power-up sequence for SN74AHCT16240DLR to avoid bus contention?
To prevent unintended output activation during power-up, tie all OE pins (1OE–4OE) to VCC through a pullup resistor. The minimum resistance value depends on the current-sinking capability of the driving source-TI recommends ≥10 kΩ for typical microcontroller GPIOs. This ensures all outputs remain in high-impedance state until firmware explicitly asserts OE low. The SN74AHCT16240DLR does not include internal power-on reset circuitry, so external OE control is mandatory for safe initialization.
Does SN74AHCT16240DLR support hot insertion or live bus swapping?
No, SN74AHCT16240DLR is not rated for hot-insertion operation. Its absolute maximum ratings do not cover powered insertion into a live backplane, and the lack of Ioff (power-off protection) specification means outputs may source/sink current when VCC = 0 V. For hot-swap applications, TI recommends dedicated hot-swap controllers or devices with explicit Ioff support, such as the SN74AVC16T245. The SN74AHCT16240DLR should only be inserted or removed with system power fully off.
Can SN74AHCT16240DLR drive a 50-pF capacitive load at 10 MHz without signal degradation?
Yes, SN74AHCT16240DLR is characterized for CL = 50 pF and delivers tPLH/tPHL ≤ 10.5 ns and tPZH/tPLZ ≤ 13 ns under those conditions-well within timing margins for 10 MHz (100 ns period) operation. Measured VOL ≤ 0.44 V and VOH ≥ 3.8 V at 8 mA confirm adequate noise margin. However, layout practices matter: use short traces, ground stitching vias near VCC/GND pins, and avoid daisy-chained stubs to preserve edge integrity. The SN74AHCT16240DLR's distributed power pins directly support this requirement.
Is SN74AHCT16240DLR pin-compatible with older 74ACT or 74F series 16-bit buffers?
No, SN74AHCT16240DLR is not pin-compatible with legacy 74ACT16240 or 74F240 devices. While functional behavior is similar, the SN74AHCT16240DLR uses a 48-pin SSOP (DL) package with unique pin assignments-including four separate OE inputs and distributed VCC/GND pins-whereas 74F240 uses 20-pin DIP/SOIC and 74ACT16240 uses 48-pin TSSOP (DGG) with different pin numbering. Always verify against the DL-package top view diagram in SCLS333I before board reuse.
What is the thermal performance of SN74AHCT16240DLR in its SSOP-DL package?
The SN74AHCT16240DLR in SSOP-DL package has a junction-to-ambient thermal resistance (θJA) of 63°C/W, measured per JESD 51. At maximum recommended operating conditions (5.5 V, 85°C ambient), worst-case static power dissipation is ~0.44 mW (ICC = 40 µA), and dynamic power at 10 MHz is ~0.5 mW (Cpd = 10 pF). This results in negligible junction temperature rise (<1°C), making heatsinking unnecessary. The DL package's thermal profile is validated for reflow per JEDEC Level-1-260°C specifications.
SN74AHCT16240DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74AHCT16240DLR FAQ
1.How can I place an order for SN74AHCT16240DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT16240DLR 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 SN74AHCT16240DLR reliable?
The price and inventory of SN74AHCT16240DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT16240DLR is usually 5 days.
3.What payment methods are accepted for SN74AHCT16240DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT16240DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT16240DLR?
SN74AHCT16240DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT16240DLR 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 SN74AHCT16240DLR?
For technical support, including SN74AHCT16240DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT16240DLR requirements.
6.How does Aetrix verify that SN74AHCT16240DLR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16240DLR 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 SN74AHCT16240DLR meets industry standards.
7.What is the process for return or replacement of SN74AHCT16240DLR?
All SN74AHCT16240DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16240DLR, 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 SN74AHCT16240DLR part is unused and in its original packaging.
Return procedure for SN74AHCT16240DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHCT16240DLR 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…
