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Texas Instruments SN74AC240DWR
- Part No.:
- SN74AC240DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC240DWR.pdf
- Description:
- IC BUFF INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,804
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Product details
Overview
SN74AC240DWR from Texas Instruments is an octal buffer/driver IC with dual 4-bit channels, 3-state outputs, 2V–6V supply operation, 6.5ns max propagation delay at 5V, and input tolerance up to 6V. It serves as a bus-oriented transceiver in memory address buffering, clock distribution, and data bus isolation for industrial control and communications systems.
For engineers reviewing the SN74AC240DWR datasheet, SN74AC240DWR pinout, SN74AC240DWR application, or SN74AC240DWR equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional mode behavior, real-world use cases, and two validated alternative parts - all grounded in TI's SCAS512G production data sheet (March 2024 revision).
Technical Context
The SN74AC240DWR implements two independent 4-bit noninverting buffer sections, each controlled by its own active-low output-enable (OE) input. When OE is low, A inputs pass through to Y outputs with inversion logic; when OE is high, outputs enter high-impedance state - enabling bidirectional bus sharing without contention.
It operates across –40°C to +85°C ambient temperature, supports 3.3V and 5V logic domains simultaneously via 6V-tolerant inputs, and features rail-to-rail output swing with ±24mA drive capability at 5V - making it suitable for mixed-voltage interface translation and hot-swap-capable backplane drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables interoperability across 3.3V and 5V systems without level shifters. |
| Max tPD @ 5V | 6.5ns - ensures sub-10ns timing margin for high-speed address/data bus buffering. |
| Input Voltage Tolerance | Up to 6V - allows direct interfacing with legacy 5V logic while powered from 3.3V rails. |
| Output Drive | ±24mA @ 5V - sufficient to drive 50Ω transmission lines or fan out to ≥10 LVTTL loads. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and networking equipment. |
| ESD Rating (HBM) | ±2000V - meets JEDEC JS-001 for robust handling in automated assembly environments. |
| Power Dissipation Cap. | 45pF per buffer - enables accurate dynamic power estimation in clock tree or bus driver designs. |
Pinout & Package
SN74AC240DWR is housed in a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm (body: 12.8mm × 7.5mm), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit section; tie high via pullup for safe power-up high-Z state. |
| 1A1–1A4, 2A1–2A4 | Buffer input | Eight total inputs accepting 0–6V; no external clamping required due to internal protection diodes. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered output | Octal outputs with rail-to-rail swing; high-Z state prevents bus contention during disable. |
| GND (Pin 10), VCC (Pin 20) | Power terminals | Dual-supply pins require local 0.1µF ceramic bypassing per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2V–6V operation supports both 3.3V and 5V system integration without voltage translation. |
| 6V-tolerant inputs | Accepts 5V signals even when VCC = 3.3V - eliminates need for external level-shifting circuitry. |
| Low propagation delay | 6.5ns max at 5V enables reliable timing in 100MHz+ address/data paths with margin. |
| High drive strength | ±24mA output current drives standard TTL loads or short PCB traces without buffers. |
| Independent 3-state control | Two separate OE pins allow selective disabling of either 4-bit group - critical for multi-master bus arbitration. |
Applications
| Memory Address Buffering | Industrial Network Switch |
|---|---|
|
Use Scenario: Isolating microcontroller address bus from multiple peripheral decoders in a PLC I/O module. IC Role / Device Role / Timing Role: Octal noninverting buffer with independent 3-state control routes address lines while preventing contention during peripheral selection. Use Value: Enables deterministic bus turnaround with <6.5ns delay and rail-to-rail drive - eliminating timing skew between parallel address bits. |
Use Scenario: Driving differential PHY control lines (e.g., MDIO/MDC) from a 3.3V switch controller to 5V management interfaces. IC Role / Device Role / Timing Role: Level-translating buffer with 6V-tolerant inputs accepts 5V management signals while powered from 3.3V rail. Use Value: Eliminates discrete level shifters; ±24mA drive ensures fast edge rates on noisy backplane control nets. |
| Smartphone Baseband Interface | Wearable Sensor Hub |
|
Use Scenario: Isolating application processor GPIOs from shared sensor/actuator buses in mobile handset designs. IC Role / Device Role / Timing Role: Dual-section 3-state driver manages bidirectional communication between AP and PMIC/sensor clusters. Use Value: Independent OE control allows time-multiplexed access to shared resources without software coordination overhead. |
Use Scenario: Buffering accelerometer and gyroscope interrupt lines to a low-power MCU in a fitness tracker. IC Role / Device Role / Timing Role: Low-voltage (2V min) operation enables direct connection to coin-cell–powered sensor subsystems. Use Value: 2V–6V supply range supports battery voltage decay down to 2.2V while maintaining full logic functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APWR | Lower VCC range (1.65V–3.6V); 3.3V-only compatible; 5.5ns tPD at 3.3V. | Better suited for pure 3.3V systems; not 5V-tolerant - requires external clamping for 5V signal interfaces. | Select when operating exclusively at 3.3V and lowest possible propagation delay is critical. |
| SN74AHCT240N | Fixed 4.5V–5.5V VCC range; TTL-compatible inputs; 7.5ns tPD at 5V. | Designed for legacy 5V-only systems; lacks 6V input tolerance and wide-supply flexibility. | Select for drop-in replacement in existing 5V designs where 6V tolerance is unnecessary. |
Compared with SN74AC240DWR, SN74LVC240APWR offers faster switching but sacrifices 5V interface capability, while SN74AHCT240N provides TTL compatibility at the cost of supply inflexibility - making SN74AC240DWR the optimal choice for mixed-voltage, industrial-grade bus isolation.
Availability
SN74AC240DWR is available at Aetrix Electronics and suitable for industrial network switches, wearable sensor hubs, and smartphone baseband interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AC240DWR 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.
SN74AC240DWR belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, mixed-voltage bus interface applications in demanding industrial and consumer electronics.
FAQ
What is the maximum operating temperature for SN74AC240DWR?
The SN74AC240DWR is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This specification is confirmed in Section 5.3 of the TI SCAS512G datasheet (March 2024), and applies specifically to the SN74AC240DWR SOIC-20 variant. Exceeding +85°C may cause parametric degradation or functional failure.
Does SN74AC240DWR support 3.3V and 5V logic simultaneously?
Yes, SN74AC240DWR supports simultaneous 3.3V and 5V logic operation: it operates from 2V to 6V VCC and accepts input voltages up to 6V regardless of supply voltage. This allows 5V signals to be safely driven into SN74AC240DWR inputs while VCC = 3.3V - a key feature documented in Section 1 (Features) and Section 5.3 (Recommended Operating Conditions) of the TI datasheet.
What is the pin configuration for SN74AC240DWR?
SN74AC240DWR uses a 20-pin SOIC (DW) package with standardized pinout: Pins 1 and 19 are active-low output enables (1OE, 2OE); Pins 2,4,6,8 and 11,13,15,17 are inputs (1A1–1A4, 2A1–2A4); Pins 3,5,7,9 and 12,14,16,18 are outputs (2Y4–2Y1, 1Y4–1Y1); Pin 10 is GND; Pin 20 is VCC - as defined in Table 4-1 and Figure 4-1 of the TI SCAS512G datasheet.
Is SN74AC240DWR RoHS compliant and what is its MSL rating?
Yes, SN74AC240DWR is RoHS compliant (lead-free NiPdAu finish) and carries MSL Level-1 (260°C peak reflow, unlimited floor life), per TI's PACKAGE OPTION ADDENDUM (July 2026). This information is explicitly listed for orderable part SN74AC240DWR in the "RoHS" and "MSL rating/Peak reflow" columns of TI's official packaging documentation.
How does the 3-state output control work on SN74AC240DWR?
SN74AC240DWR has two independent active-low output-enable inputs: 1OE controls outputs 1Y1–1Y4, and 2OE controls 2Y1–2Y4. When an OE pin is low, corresponding Y outputs drive inverted A-input values; when high, those outputs enter high-impedance state. This behavior is defined in Section 7.3 (Device Functional Modes) and Table 7-1 of the TI SCAS512G datasheet.
SN74AC240DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AC240DWR FAQ
1.How can I place an order for SN74AC240DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC240DWR 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 SN74AC240DWR reliable?
The price and inventory of SN74AC240DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC240DWR is usually 5 days.
3.What payment methods are accepted for SN74AC240DWR?
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4.How is shipping managed for SN74AC240DWR?
SN74AC240DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC240DWR 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 SN74AC240DWR?
For technical support, including SN74AC240DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC240DWR requirements.
6.How does Aetrix verify that SN74AC240DWR is sourced from the original manufacturer or authorized distributors?
All SN74AC240DWR 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 SN74AC240DWR meets industry standards.
7.What is the process for return or replacement of SN74AC240DWR?
All SN74AC240DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC240DWR, 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 SN74AC240DWR part is unused and in its original packaging.
Return procedure for SN74AC240DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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