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Texas Instruments SN74ABT240ADBRG4
- Part No.:
- SN74ABT240ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT240ADBRG4.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,702
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Product details
Overview
SN74ABT240ADBRG4 from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for memory address and bus interface applications. It features high-drive capability (–32 mA IOH, 64 mA IOL), Ioff support for partial-power-down mode, and operates over –40°C to 85°C with 4.5–5.5 V supply. Used in industrial control backplanes and legacy data bus isolation.
For engineers reviewing the SN74ABT240ADBRG4 datasheet, SN74ABT240ADBRG4 pinout, SN74ABT240ADBRG4 application, or SN74ABT240ADBRG4 equivalent, key selection criteria include guaranteed 3-state output disable timing (tPZL ≤ 6.2 ns), ground-bounce immunity (<1 V VOLP), and SSOP-20 package compatibility with JEDEC MO-150 footprint.
Technical Context
This device implements two independent 4-bit inverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Logic operation follows strict TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) and supports hot-insertion via Ioff circuitry that limits reverse current to ±100 µA when VCC = 0.
Output switching adheres to defined propagation delays (tPLH/tPHL ≤ 4.8 ns at VCC = 5 V, CL = 50 pF) and enables precise bus arbitration through fast enable/disable transitions (tPZH/tPLZ ≤ 5.2 ns). The architecture avoids internal latching and requires external pull-up on OE for power-up high-impedance assurance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage system rails. |
| Output Drive | –32 mA IOH / 64 mA IOL - Supports heavy capacitive loads and fan-out to ≥10 standard TTL inputs. |
| Ioff Current | ±100 µA at VCC = 0 - Enables safe backplane insertion without damaging current flow during partial power-down. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns - Guarantees sub-5-ns signal path timing for high-speed address/data buffering. |
| 3-State Enable Time | tPZH ≤ 5.2 ns - Allows rapid bus release for time-critical multiplexing in shared-memory systems. |
| ESD Rating | 2000-V HBM - Meets industrial-level electrostatic discharge robustness per JESD22-A114. |
| Operating Temp | –40°C to +85°C - Qualified for extended-temperature industrial environments without derating. |
Pinout & Package
SN74ABT240ADBRG4 uses a 20-pin SSOP (Shrink Small Outline Package) per JEDEC MO-150, 7.4 mm × 5.3 mm body, 0.65 mm lead pitch, 2.0 mm max height. Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Drives corresponding Y outputs low when asserted; high-impedance otherwise - enables dual-bank bus control. |
| 1A1–1A4, 2A1–2A4 | Inverting input | Each A input drives inverted logic to its paired Y output - supports address/data inversion without external gates. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state output | Outputs reflect inverted A inputs when OE is low; high-Z when OE is high - prevents bus contention. |
| VCC (Pin 10) | Power supply | 5-V nominal supply connection - decoupling capacitor required within 10 mm for noise suppression. |
| GND (Pin 20) | Ground reference | Common return for all signals and power - must connect to solid ground plane beneath package. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | Delivers –32 mA sink/source to drive long traces, multiple loads, or noisy industrial buses without signal degradation. |
| Ioff Partial-Power-Down | Prevents destructive backflow current when VCC is off but bus lines remain active - critical for hot-swap backplanes. |
| Low Ground Bounce | VOLP < 1 V ensures clean low-state transitions even under heavy simultaneous switching - reduces EMI and timing jitter. |
| Latch-Up Immunity | Exceeds 500 mA per JESD17 - eliminates risk of destructive latch-up in high-noise factory automation environments. |
| TTL-Compatible Interface | VIH/VIL thresholds match legacy 5-V TTL logic families - enables drop-in replacement in existing designs without level-shifting. |
Applications
| Industrial Backplane Buffering | Legacy Memory Address Driver |
|---|---|
Use Scenario: Isolating CPU address lines from multiple peripheral cards in a DIN-rail mounted PLC rack. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled address propagation with fast disable to prevent bus conflicts during card insertion. Use Value: Guaranteed tPZL ≤ 6.2 ns ensures address bus release before next cycle begins, eliminating race conditions in deterministic real-time control loops. | Use Scenario: Driving 16-bit address bus for EPROM-based firmware storage in avionics maintenance test equipment. IC Role / Device Role / Timing Role: Octal inverting driver translating microcontroller address outputs to memory chip inputs with noise margin and drive strength. Use Value: 64-mA IOL sustains stable low-level voltage across 15-cm PCB traces loaded with 8 parallel EPROM inputs, preventing read errors. |
| Bus-Oriented Transmitter | Clock Distribution Isolation |
Use Scenario: Transmitting status flags across a multi-drop RS-422-like differential bus in factory floor HMIs. IC Role / Device Role / Timing Role: Enabling/disabling inverted flag data onto shared bus lines using separate OE controls per 4-bit group. Use Value: Dual OE inputs allow independent gating of upper/lower nibbles - simplifies protocol framing without FPGA logic overhead. | Use Scenario: Distributing a 25-MHz system clock to three isolated subsystems while preventing skew-induced metastability. IC Role / Device Role / Timing Role: Fan-out buffer isolating master clock source from downstream PLLs and ADC sampling circuits. Use Value: Sub-5-ns tPLH/tPHL and <1-V VOLP minimize clock edge distortion and jitter accumulation across distributed nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADWRG4 | SOIC-20 package (7.5 mm × 10.3 mm), higher θJA (58°C/W), same electrical specs. | Better suited for manual assembly or prototyping due to larger pad spacing and visibility. | Select when board space allows larger footprint and thermal management includes airflow or heatsinking. |
| SN74ABT240ANSRG4 | SOP-20 package (7.5 mm × 10.3 mm), identical pinout, RoHS-compliant NiPdAu finish. | Compatible with legacy SOP reflow profiles; slightly lower Ioff leakage (±50 µA typical vs ±100 µA). | Choose for cost-sensitive industrial boards where SOP tooling already exists and thermal load is moderate. |
Compared with SN74ABT240ADWRG4 and SN74ABT240ANSRG4, the SN74ABT240ADBRG4 offers the smallest PCB footprint (SSOP), highest density routing capability, and best thermal performance for compact embedded modules - making it optimal for space-constrained industrial gateways and edge controllers.
Availability
SN74ABT240ADBRG4 is available at Aetrix Electronics and suitable for industrial backplane buffering, legacy memory address driving, and bus-oriented transmitter applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ABT240ADBRG4 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 connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The ABT logic family, including SN74ABT240ADBRG4, was engineered for high-speed, high-drive 5-V TTL-compatible bus interfacing in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum output current rating for SN74ABT240ADBRG4?
The SN74ABT240ADBRG4 supports –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values are guaranteed across the full temperature range (–40°C to +85°C) and ensure reliable drive into heavy capacitive or resistive loads without exceeding voltage thresholds.
Does SN74ABT240ADBRG4 support partial-power-down operation?
Yes, SN74ABT240ADBRG4 includes Ioff circuitry that limits reverse current to ±100 µA when VCC = 0 V and any input or output is biased between 0 and 4.5 V. This feature enables safe use in hot-plug backplane systems where powered-down slots must not disrupt active bus segments.
What is the pin configuration for SN74ABT240ADBRG4?
SN74ABT240ADBRG4 uses a 20-pin SSOP package with dual 4-bit inverting buffer sections. Pins 1–4 and 11–14 are inputs (1A1–1A4, 2A1–2A4); pins 5–8 and 15–18 are corresponding inverted outputs (1Y1–1Y4, 2Y1–2Y4); pins 9 and 19 are active-low output enables (1OE, 2OE); pin 10 is VCC; pin 20 is GND.
How does SN74ABT240ADBRG4 handle ground bounce during switching?
SN74ABT240ADBRG4 specifies typical output ground bounce (VOLP) <1 V at VCC = 5 V and TA = 25°C. This low value results from optimized output stage design and internal layout, minimizing transient voltage spikes on shared ground paths during simultaneous output transitions - critical for signal integrity in dense PCB layouts.
Is SN74ABT240ADBRG4 RoHS compliant and what is its MSL rating?
Yes, SN74ABT240ADBRG4 is RoHS compliant with NiPdAu lead finish and carries an MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning no bake preconditioning is required before surface-mount assembly. Its SSOP-20 package meets JEDEC MO-150 standards and supports standard reflow profiles up to 260°C peak.
SN74ABT240ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
SN74ABT240ADBRG4 FAQ
1.How can I place an order for SN74ABT240ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ADBRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABT240ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ADBRG4 is usually 5 days.
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Once your SN74ABT240ADBRG4 order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74ABT240ADBRG4?
For technical support, including SN74ABT240ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ADBRG4 requirements.
6.How does Aetrix verify that SN74ABT240ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ADBRG4 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 SN74ABT240ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT240ADBRG4?
All SN74ABT240ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ADBRG4, 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 SN74ABT240ADBRG4 part is unused and in its original packaging.
Return procedure for SN74ABT240ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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