My Inquiry
My Account
Texas Instruments SN74ABT240APWR
- Part No.:
- SN74ABT240APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT240APWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:822
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT240APWR from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for memory address and bus interface applications. It features dual 4-bit sections with independent active-low output-enable (OE) inputs, high-drive capability (–32 mA IOH, 64 mA IOL), Ioff partial-power-down support, and operates over –40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABT240APWR datasheet, SN74ABT240APWR pinout, SN74ABT240APWR application, or SN74ABT240APWR equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional behavior under power sequencing, and validated alternatives for bus buffering in industrial control and data acquisition systems.
Technical Context
The SN74ABT240APWR implements two independent 4-bit inverting buffer sections, each with separate OE control. Its logic function is Y = NOT(A) when OE is low; outputs enter high-impedance state when OE is high. The device uses ABT (Advanced BiCMOS Technology) to achieve TTL-compatible input thresholds and fast switching.
It supports partial-power-down via Ioff circuitry that disables outputs when VCC = 0 V, preventing backflow current. Ground bounce (VOLP) is specified <1 V at 5 V and 25°C, and latch-up performance exceeds 500 mA per JESD-17 - critical for robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage system rails |
| Output Drive | –32 mA IOH / 64 mA IOL - enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffers |
| Ioff Support | ±100 µA max at VCC = 0 - guarantees safe isolation during hot-swap or partial power-down sequences |
| Propagation Delay | 1.0–4.8 ns (tPLH/tPHL @ 5 V, CL = 50 pF) - meets timing requirements for high-speed address/data bus buffering up to ~100 MHz |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - provides noise margin >0.4 V against TTL-level signals and ensures reliable logic recognition |
| ESD Protection | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115, supporting handling in non-ESD-controlled assembly areas |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature range without derating |
Pinout & Package
TSSOP-20 package (PW), 6.95 mm × 7.0 mm footprint, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls respective 4-bit section; tie to VCC via pullup for power-up high-Z safety |
| 1A1–1A4, 2A1–2A4 | Input terminals | Inverting data inputs for each buffer section; TTL-compatible voltage thresholds |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs | High-drive 3-state outputs; sink/source capability supports fanout ≥10 LSTTL loads |
| VCC (Pin 10) | Power supply | Must be decoupled locally; thermal impedance θJA = 83°C/W requires PCB copper pour for sustained 64-mA loads |
| GND (Pin 20) | Ground reference | Low-inductance return path essential to minimize ground bounce (VOLP <1 V specified) |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | 64-mA sink capability eliminates need for external drivers in dense bus architectures |
| Ioff Partial-Power-Down | Prevents damaging current flow when VCC is off but buses remain live - required for hot-plug subsystems |
| Low Ground Bounce | VOLP <1 V at 5 V/25°C ensures signal integrity on shared ground planes in multi-device systems |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - enables reliable operation in electrically noisy factory automation environments |
| TTL-Compatible Inputs | VIH = 2.0 V / VIL = 0.8 V matches legacy TTL logic families without level-shifting components |
Applications
| Industrial PLC Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Isolating and strengthening address lines between microcontroller and parallel SRAM/Flash in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting octal buffer with 3-state outputs enabling bidirectional address bus sharing and reducing trace loading. Use Value: 64-mA drive strength maintains signal edge rate across 15-cm backplane traces; Ioff prevents backfeed during module hot-swap. | Use Scenario: Driving high-capacitance address lines in embedded instrumentation with 512 KB external memory. IC Role / Device Role / Timing Role: Dual-section inverting buffer providing isolated enable control for upper/lower memory banks. Use Value: 1.0–4.8 ns propagation delay ensures setup/hold timing margins at 20-MHz bus clocks; VOLP <1 V preserves noise margin. |
| Test Equipment Digital I/O Expansion | Legacy Bus Signal Conditioning |
Use Scenario: Expanding digital I/O count in automated test systems using ISA or PCI-104 buses with TTL-level signaling. IC Role / Device Role / Timing Role: Octal 3-state driver translating MCU GPIO to robust bus drivers with independent OE control per group. Use Value: ±100 µA Ioff allows safe insertion/removal while bus remains powered; 2000-V HBM ESD rating withstands lab handling. | Use Scenario: Interfacing modern microcontrollers to legacy 5-V TTL peripherals (e.g., UART transceivers, display controllers). IC Role / Device Role / Timing Role: Level-tolerant inverting buffer restoring signal integrity and fanout capacity on aging bus segments. Use Value: VIH/VIL thresholds match TTL exactly; 64-mA sink drives long cables or multiple legacy receivers without signal degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADWR | SOIC-20 package (7.5-mm width); θJA = 58°C/W vs. 83°C/W for PW; identical electrical specs | Better thermal performance for continuous high-current operation; larger footprint limits high-density layouts | Select when board space permits and thermal dissipation >150 mW is required |
| SN74ABT240ANSR | SOP-20 package (5.3-mm body width); same pinout and logic; slightly higher θJA (60°C/W) | Lower profile than SOIC but wider than TSSOP; compatible with wave-solder processes | Choose for cost-sensitive industrial designs requiring SOP compatibility and moderate power handling |
Compared with SN74ABT240ADWR and SN74ABT240ANSR, the SN74ABT240APWR offers the smallest PCB footprint (6.95 × 7.0 mm) and highest density integration, though its 83°C/W thermal resistance requires careful copper planning for sustained 64-mA loads - making it optimal for space-constrained, intermittently loaded bus interfaces.
Availability
SN74ABT240APWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address buffering, test equipment I/O expansion, and legacy bus signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT240APWR 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 50 years of industrial-grade product development.
The SN74ABT240APWR belongs to TI's ABT logic family, engineered for high-speed, high-drive 3-state bus interface applications in industrial automation, test equipment, and computing infrastructure where reliability under electrical stress is critical.
FAQ
What is the logic function of SN74ABT240APWR?
The SN74ABT240APWR implements two independent 4-bit inverting buffers. When OE is low, Y = NOT(A); when OE is high, all outputs go high-impedance. This behavior is confirmed in the function table and logic diagram of the SCBS098I datasheet. The SN74ABT240APWR does not perform noninverting operation - only inversion with 3-state control per section.
Does SN74ABT240APWR support partial-power-down mode?
Yes, SN74ABT240APWR includes Ioff circuitry that disables outputs when VCC = 0 V, limiting current to ±100 µA even if input or output voltages reach 4.5 V. This feature is explicitly documented in the datasheet description and absolute maximum ratings, enabling safe use in hot-swap or mixed-power-domain systems where SN74ABT240APWR may be unpowered while adjacent devices remain active.
What is the recommended power-up sequence for SN74ABT240APWR?
To ensure outputs remain in high-impedance during power-up, OE pins should be tied to VCC through a pullup resistor. The minimum value depends on the driver's sink capability - typically ≤10 kΩ suffices for most microcontroller GPIOs. This requirement is stated in the datasheet's "description (continued)" section and prevents bus contention before firmware initializes OE control, a key reliability measure for SN74ABT240APWR in embedded systems.
Can SN74ABT240APWR drive multiple LSTTL loads?
Yes, SN74ABT240APWR can directly drive ≥10 LSTTL loads per output due to its 64-mA sink and –32-mA source capability. This is derived from the IOL = 64 mA specification at VOL ≤ 0.55 V and the standard LSTTL load definition (IIL = –0.4 mA). The high-drive strength eliminates need for additional buffers in typical bus applications, a core design advantage of the SN74ABT240APWR.
Is SN74ABT240APWR pin-compatible with other ABT240 variants?
Yes, SN74ABT240APWR shares identical pinout and logic functionality with all SN74ABT240A variants (e.g., ADWR, ANSR, ADBR) across SOIC, SOP, SSOP, and TSSOP packages. The datasheet confirms "SN74ABT240A … DB, DW, N, NS, OR PW PACKAGE" share the same top-view pin numbering and signal assignments - meaning SN74ABT240APWR can be substituted into existing footprints for those packages with appropriate layout adaptation for TSSOP dimensions and thermal relief.
SN74ABT240APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ABT240APWR FAQ
1.How can I place an order for SN74ABT240APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240APWR 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 SN74ABT240APWR reliable?
The price and inventory of SN74ABT240APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240APWR is usually 5 days.
3.What payment methods are accepted for SN74ABT240APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT240APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT240APWR?
SN74ABT240APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240APWR 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 SN74ABT240APWR?
For technical support, including SN74ABT240APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240APWR requirements.
6.How does Aetrix verify that SN74ABT240APWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT240APWR 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 SN74ABT240APWR meets industry standards.
7.What is the process for return or replacement of SN74ABT240APWR?
All SN74ABT240APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240APWR, 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 SN74ABT240APWR part is unused and in its original packaging.
Return procedure for SN74ABT240APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT240APWR 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…
