My Inquiry
My Account
Texas Instruments SN74BCT540ADWR
- Part No.:
- SN74BCT540ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT540ADWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,037
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74BCT540ADWR from Texas Instruments is an octal non-inverting buffer/driver with dual 3-state enable inputs (OE1, OE2), designed for bus line driving and memory address register buffering in 5-V TTL-compatible systems. It operates from 4.5 V to 5.5 V, delivers ±64 mA output drive capability, features BiCMOS architecture to minimize ICCZ quiescent current (3–6 mA), and uses P-N-P inputs to reduce DC loading on upstream logic.
For engineers reviewing the SN74BCT540ADWR datasheet, SN74BCT540ADWR pinout, SN74BCT540ADWR application, or SN74BCT540ADWR equivalent, key selection considerations include its 20-pin SOIC-DW package, data flow-through pinout (inputs on one side, outputs on the other), dual active-low 3-state control, and compatibility with legacy TTL and BCT logic families in industrial control and embedded memory subsystems.
Technical Context
This device implements eight independent non-inverting buffer channels, each with output-enable gating via a 2-input AND structure where both OE1 and OE2 must be low for output assertion. The BiCMOS process enables high-speed switching (tPLH/tPHL ≤ 6.9 ns at 5 V) while maintaining TTL-level input thresholds (VIH = 2 V min, VIL = 0.8 V max) and robust 3-state leakage control (IOZL/IOZH ≤ ±50 µA).
Its absolute maximum ratings support 7-V input tolerance and –0.5 V to 5.5 V disabled-output voltage range, and ESD protection exceeds JESD22-A114A (2000-V HBM), making it suitable for mixed-signal board environments with moderate noise and transient exposure.
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 and brown-out margins. |
| Output Drive (IOL) | 64 mA - Sufficient to sink eight TTL loads or drive unterminated 50-Ω transmission lines. |
| Propagation Delay | 2.0–6.9 ns (tPLH/tPHL) - Enables reliable timing in 100+ MHz address/data bus applications. |
| 3-State Leakage | ±50 µA (IOZL/IOZH) - Minimizes bus contention current when outputs are disabled. |
| Input Clamp Current | –18 mA - Protects inputs against overvoltage transients without external clamping diodes. |
| Quiescent ICCZ | 3–6 mA - Low power consumption during 3-state hold, critical for standby-mode system design. |
| ESD Rating (HBM) | 2000 V - Meets industrial-grade handling requirements without additional board-level protection. |
Pinout & Package
SN74BCT540ADWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Non-inverting data inputs; P-N-P structure reduces DC loading on preceding logic stages. |
| 9 | GND | Ground reference for all internal circuitry and output stage return path. |
| 10 | VCC | Positive supply (4.5–5.5 V); powers BiCMOS output drivers and input buffers. |
| 11, 20 | OE1, OE2 | Active-low 3-state enable inputs; AND-gated - both must be low for Y1–Y8 output assertion. |
| 12–19 | Y1–Y8 Outputs | Buffered non-inverting outputs; capable of sourcing –15 mA or sinking 64 mA in active state. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flow-Through Pinout | Inputs (pins 1–8) and outputs (pins 12–19) on opposite sides - simplifies PCB trace routing and minimizes crosstalk in dense bus layouts. |
| Dual 3-State Enable Logic | OE1 and OE2 form an AND gate with active-low inputs - allows hierarchical bus control (e.g., chip-select + direction-enable coordination). |
| BiCMOS Output Stage | Combines bipolar speed and CMOS efficiency - achieves <7 ns propagation delay while limiting ICCZ to 6 mA max. |
| P-N-P Input Structure | Reduces input DC loading to ≤0.6 mA (IIL) - preserves fanout margin when driving multiple SN74BCT540ADWR inputs from a single source. |
| JESD22 ESD Protection | HBM = 2000 V, MM = 200 V, CDM = 1000 V - eliminates need for external ESD diodes in most industrial board designs. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
|
Use Scenario: Buffering 8-bit address lines between microcontroller and SRAM/ROM in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting address driver with 3-state control synchronized to memory read/write strobes. Use Value: Prevents address bus contention during DMA cycles and ensures clean signal edges at >20 MHz clock rates. |
Use Scenario: Isolating and driving shared I/O bus lines among multiple peripheral modules in factory automation hardware. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled by master arbitration logic via OE1/OE2. Use Value: Enables hot-swappable module insertion without disrupting active bus traffic due to low 3-state leakage (±50 µA). |
| Legacy TTL System Upgrade | Test Equipment Signal Conditioning |
|
Use Scenario: Replacing obsolete SN74LS540 in aging test fixtures requiring higher drive strength and lower power. IC Role / Device Role / Timing Role: Drop-in-compatible octal buffer with identical pinout and TTL-compatible voltage thresholds. Use Value: Delivers 64 mA sink current vs. LS540's 24 mA - supports modern probe loads and longer backplane traces. |
Use Scenario: Driving calibrated analog multiplexer address inputs in automated test equipment with strict timing jitter limits. IC Role / Device Role / Timing Role: Low-skew, low-glitch address selector buffer synchronized to system clock edge. Use Value: Propagation delay variation (tPLH–tPHL spread ≤ 4.9 ns) ensures deterministic channel selection timing across all eight outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT540PW | Higher speed (tPD ≤ 4.5 ns), ACT logic family, 4.5–5.5 V supply, but only 24 mA IOL and no P-N-P inputs. | Better for high-frequency digital systems with CMOS-compatible inputs; less suitable for legacy TTL fanout-limited designs. | Choose SN74ACT540PW when interfacing with 3.3-V or mixed-voltage logic and timing budget is tighter than 5 ns. |
| SN74LS540N | Lower drive (24 mA IOL), higher ICC (45 mA typical), slower (tPD ≤ 15 ns), PDIP-only, no BiCMOS optimization. | Compatible with vintage 5-V TTL systems but lacks ESD robustness and thermal efficiency of SN74BCT540ADWR. | Choose SN74LS540N only for exact form-fit-function replacement in legacy repair scenarios where BiCMOS benefits are unnecessary. |
Compared with SN74ACT540PW and SN74LS540N, the SN74BCT540ADWR uniquely balances legacy TTL compatibility, 64 mA drive, and BiCMOS power efficiency-making it optimal for industrial upgrades where reliability, bus loading, and thermal management are prioritized over raw speed.
Availability
SN74BCT540ADWR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and legacy logic interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74BCT540ADWR 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 industry-standard logic families.
The SN74BCT540ADWR belongs to TI's BCT (Bipolar-CMOS Transistor) logic series, engineered specifically for high-drive, low-quiescent-current 5-V bus interfacing in industrial and computing infrastructure.
FAQ
What is the operating voltage range for SN74BCT540ADWR?
The SN74BCT540ADWR operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V power rails while accommodating typical supply tolerances and transient dips. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings (VCC ≤ 7 V).
How does the dual 3-state enable (OE1 and OE2) function in SN74BCT540ADWR?
In the SN74BCT540ADWR, OE1 and OE2 form a 2-input AND gate with active-low logic: both pins must be driven low for Y1–Y8 outputs to be active. If either OE1 or OE2 is high, all eight outputs enter high-impedance state. This allows flexible bus arbitration schemes, such as using OE1 for chip select and OE2 for read/write direction control.
Is SN74BCT540ADWR pin-compatible with SN74LS540N?
Yes, SN74BCT540ADWR shares identical 20-pin SOIC pinout and functional mapping with SN74LS540N, including A1–A8, Y1–Y8, OE1, OE2, VCC, and GND positions. However, SN74BCT540ADWR offers superior drive strength (64 mA vs. 24 mA), lower ICCZ, and enhanced ESD protection - making it a direct performance upgrade.
What package type and dimensions does SN74BCT540ADWR use?
SN74BCT540ADWR uses a 20-pin SOIC (DW) package per JEDEC MS-013, measuring 12.83 mm × 7.5 mm × 2.65 mm max height. It features NiPdAu lead finish, RoHS compliance, and Level-1 moisture sensitivity - suitable for standard reflow assembly without dry-pack requirements.
Does SN74BCT540ADWR require external pull-up resistors on OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, OE1 and OE2 should each be tied to VCC through a pull-up resistor. TI recommends minimum resistance based on driver sink capability; a 10-kΩ resistor is commonly used and verified in application notes for reliable initialization behavior of SN74BCT540ADWR.
SN74BCT540ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT540ADWR FAQ
1.How can I place an order for SN74BCT540ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT540ADWR 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 SN74BCT540ADWR reliable?
The price and inventory of SN74BCT540ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT540ADWR is usually 5 days.
3.What payment methods are accepted for SN74BCT540ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT540ADWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT540ADWR?
SN74BCT540ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT540ADWR 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 SN74BCT540ADWR?
For technical support, including SN74BCT540ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT540ADWR requirements.
6.How does Aetrix verify that SN74BCT540ADWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT540ADWR 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 SN74BCT540ADWR meets industry standards.
7.What is the process for return or replacement of SN74BCT540ADWR?
All SN74BCT540ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT540ADWR, 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 SN74BCT540ADWR part is unused and in its original packaging.
Return procedure for SN74BCT540ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74BCT540ADWR 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…
