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Texas Instruments 74ACT11240DBRE4
- Part No.:
- 74ACT11240DBRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ACT11240DBRE4.pdf
- Description:
- IC BUFF INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,890
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Product details
Overview
74ACT11240DBRE4 from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It operates over −40°C to 85°C, supports 4.5–5.5 V supply, delivers ±24 mA output drive, and features TTL-compatible inputs and flow-through pinout for optimized PCB layout.
For engineers reviewing the 74ACT11240DBRE4 datasheet, 74ACT11240DBRE4 pinout, 74ACT11240DBRE4 application, or 74ACT11240DBRE4 equivalent, key selection criteria include 3-state control timing (tPZH ≤ 10 ns), low-output leakage (IOZ ≤ ±5 µA), symmetrical active-low OE inputs, and SSOP-24 package compatibility with high-density board designs.
Technical Context
This device implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. All eight outputs enter high-impedance state when either OE is asserted, enabling bidirectional bus management without external logic.
It uses TI's EPIC (Enhanced-Performance Implanted CMOS) 1-µm process, delivering AC performance comparable to bipolar while maintaining CMOS power efficiency. Center-pin VCC/GND placement minimizes switching noise, and latch-up immunity exceeds 500 mA at 125°C.
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 systems |
| Output Drive | ±24 mA - sufficient to drive 50-Ω transmission lines or fan-out to ≥20 LSTTL loads |
| Propagation Delay | tPLH/tPHL ≤ 10.6 ns - enables reliable operation in 50-MHz bus systems |
| 3-State Enable Time | tPZH ≤ 10 ns - supports fast bus arbitration and dynamic signal routing |
| Input Compatibility | TTL-voltage level - accepts standard 0.8 V/2.0 V thresholds without level-shifting circuitry |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded and computing environments |
| Power Dissipation | 0.65 W max (DB package) - compatible with standard FR-4 PCBs without forced air cooling |
Pinout & Package
The 74ACT11240DBRE4 is housed in a 24-pin Shrink Small-Outline Package (SSOP-DB), 0.209-inch body width, with gull-wing leads and JEDEC MO-150 compliance. Pin 1 is located in Quadrant 1 per TI mechanical drawing MSSO002E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs | Eight total outputs, grouped as two 4-bit banks; each bank driven by separate OE |
| 1A1–1A4, 2A1–2A4 | Inverting input signals | Two independent 4-bit input groups; logic inversion occurs at output |
| 1OE, 2OE | Active-low output enable | Each controls one 4-bit output bank; both must be low for outputs to be active |
| VCC (Pins 14, 15) | Positive supply | Dual center-placed VCC pins reduce supply inductance and improve noise immunity |
| GND (Pins 7, 8, 9, 10) | Ground reference | Four adjacent GND pins provide low-inductance return paths for high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output pin alignment (e.g., A1→Y1 on same side) simplifies layer routing and reduces trace crossovers |
| Center-pin VCC/GND | Dual VCC and four GND pins placed centrally minimize ground bounce and supply rail collapse during simultaneous switching |
| EPIC CMOS process | Combines speed of bipolar with CMOS low static power: ICC < 80 µA at 5.5 V, no DC path between VCC and GND |
| 500-mA latch-up immunity | Withstands transient overcurrent events up to 125°C without destructive latch-up-critical for hot-swap or noisy power environments |
| TTL-input compatibility | Accepts standard TTL VIH/VIL thresholds (2.0 V / 0.8 V) while operating from 5-V supply-eliminates need for external level shifters |
Applications
| Memory Address Buffering | System Bus Transceiver |
|---|---|
Use Scenario: Driving 20-bit address buses in microprocessor-based systems with multiple memory banks. IC Role / Device Role / Timing Role: Inverting octal buffer providing isolation and fan-out amplification for address lines; 3-state control enables shared bus access. Use Value: Symmetrical tPLH/tPHL (≤10.6 ns) ensures setup/hold timing margins across all address bits; low VOL (0.44 V) guarantees clean logic '0' under load. | Use Scenario: Bidirectional data path control between CPU and peripheral ICs on a shared 8-bit data bus. IC Role / Device Role / Timing Role: Dual 4-bit 3-state buffer enabling direction-controlled data transfer; OE pins synchronized to bus control signals. Use Value: Fast tPZH (≤10 ns) and tPHZ (≤9.4 ns) minimize bus turnaround time; ±24 mA drive sustains signal integrity across 10-cm traces. |
| Clock Distribution Network | Legacy Peripheral Interface |
Use Scenario: Distributing inverted clock or strobe signals to multiple synchronous peripherals (e.g., ADCs, DACs). IC Role / Device Role / Timing Role: Low-skew inverting buffer with matched propagation delays across all eight outputs. Use Value: Max skew between Y1–Y4 outputs < 1.5 ns (per datasheet test conditions); flow-through layout prevents inter-channel coupling. | Use Scenario: Interfacing modern controllers to legacy parallel devices such as dot-matrix printers or ISA-style I/O cards. IC Role / Device Role / Timing Role: Level-translating and buffering interface with TTL-compatible inputs and robust 5-V CMOS outputs. Use Value: Guaranteed VIH = 2.0 V minimum ensures reliable recognition of legacy TTL outputs; 500-mA latch-up immunity protects against bus contention faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT240DBR | Same function, identical pinout, but uses SOIC-DW (24-pin) instead of SSOP-DB; higher thermal dissipation (1.7 W vs. 0.65 W) | Better suited for high-power or thermally constrained environments where board space allows larger footprint | Select 74ACT240DBR if board layout accommodates wider SOIC and thermal budget exceeds 0.65 W |
| SN74LVC8T245RHLR | Non-inverting, dual-supply (1.65–5.5 V), 3-state; supports voltage translation; different pinout and logic polarity | Enables level-shifting between 3.3-V and 5-V domains; not drop-in due to non-inverting behavior and asymmetric OE structure | Choose SN74LVC8T245RHLR only when voltage translation or non-inverting logic is required-and redesign for pin mapping and OE handling |
Compared with 74ACT240DBR and SN74LVC8T245RHLR, the 74ACT11240DBRE4 offers optimal density and noise control in space-constrained industrial PCBs via its SSOP-DB package and center-pin power/ground architecture, while retaining strict TTL compatibility and proven latch-up resilience.
Availability
74ACT11240DBRE4 is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, legacy peripheral adapters, and clock distribution networks requiring stable component supply and long-term industrial temperature support.
Supply support for 74ACT11240DBRE4 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 industrial and computing components.
The 74ACT11240DBRE4 belongs to TI's advanced CMOS (ACT) logic family, engineered for high-speed, low-noise bus interfacing in industrial and computing systems where TTL compatibility and layout efficiency are critical.
FAQ
What is the operating temperature range for the 74ACT11240DBRE4?
The 74ACT11240DBRE4 is characterized for operation from −40°C to +85°C, meeting industrial-grade environmental requirements. This range is verified per TI's SCAS210A datasheet and applies specifically to the DB-package variant. The 74ACT11240DBRE4 maintains full electrical specifications-including propagation delay, output drive, and 3-state leakage-across this entire range without derating.
Does the 74ACT11240DBRE4 support TTL-level inputs?
Yes, the 74ACT11240DBRE4 features TTL-voltage-compatible inputs, with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V. This allows direct interfacing with standard TTL outputs without level-shifting circuitry. The 74ACT11240DBRE4 achieves this while operating from a single 5-V supply, preserving signal integrity and reducing BOM count.
What is the maximum output current specification for the 74ACT11240DBRE4?
The 74ACT11240DBRE4 provides ±24 mA output current per pin under recommended operating conditions (VCC = 4.5–5.5 V, TA = −40°C to 85°C). This is specified as IOL = 24 mA (low-level) and IOH = −24 mA (high-level), ensuring robust drive capability for 50-Ω lines or fan-out to ≥20 LSTTL loads. The 74ACT11240DBRE4 maintains this rating across its full temperature range.
Is the 74ACT11240DBRE4 pin-compatible with other 74ACT240 variants?
No-the 74ACT11240DBRE4 has identical logic functionality and pin count (24-pin) but differs in pin assignment from the standard 74ACT240. Specifically, the 74ACT11240DBRE4 uses dual OE inputs (1OE, 2OE) and split input/output grouping (1A1–1A4/1Y1–1Y4 and 2A1–2A4/2Y1–2Y4), whereas the 74ACT240 uses a single OE and interleaved pinout. PCB layout must be redesigned to accommodate the 74ACT11240DBRE4's flow-through architecture.
What package type is used for the 74ACT11240DBRE4?
The 74ACT11240DBRE4 is packaged in a 24-pin Shrink Small-Outline Package (SSOP-DB), measuring 7.5 mm × 5.0 mm with 0.65-mm lead pitch. This JEDEC MO-150-compliant package features gull-wing leads and is optimized for high-density PCB layouts. The "DB" designation in the part number explicitly identifies this SSOP variant, distinguishing it from DW (SOIC) and NT (PDIP) alternatives.
74ACT11240DBRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
74ACT11240DBRE4 FAQ
1.How can I place an order for 74ACT11240DBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11240DBRE4 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 74ACT11240DBRE4 reliable?
The price and inventory of 74ACT11240DBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11240DBRE4 is usually 5 days.
3.What payment methods are accepted for 74ACT11240DBRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11240DBRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11240DBRE4?
74ACT11240DBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11240DBRE4 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 74ACT11240DBRE4?
For technical support, including 74ACT11240DBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11240DBRE4 requirements.
6.How does Aetrix verify that 74ACT11240DBRE4 is sourced from the original manufacturer or authorized distributors?
All 74ACT11240DBRE4 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 74ACT11240DBRE4 meets industry standards.
7.What is the process for return or replacement of 74ACT11240DBRE4?
All 74ACT11240DBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11240DBRE4, 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 74ACT11240DBRE4 part is unused and in its original packaging.
Return procedure for 74ACT11240DBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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