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Texas Instruments SN74BCT623DW
- Part No.:
- SN74BCT623DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT623DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,959
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Product details
Overview
SN74BCT623DW from Texas Instruments is a 16-bit dual-supply bus transceiver with independent A-to-B and B-to-A data paths, dual output-enable controls (OEAB/OEBA), BiCMOS logic architecture, and 5-V operation. It enables bidirectional asynchronous bus communication in industrial control backplanes and legacy computing systems requiring high-drive TTL-compatible outputs and bus isolation.
For engineers reviewing the SN74BCT623DW datasheet, SN74BCT623DW pinout, SN74BCT623DW application, or SN74BCT623DW equivalent, key selection criteria include its 128-mA low-level output drive per B-port pin, 6–11 mA ICCZ quiescent current, 0.3–0.55 V VOL across temperature, DW-package thermal profile, and dual-enable data latching capability.
Technical Context
The SN74BCT623DW implements true bidirectional data flow via two independent enable inputs: OEAB controls A→B transmission, OEBA controls B→A transmission. Its BiCMOS design combines bipolar output stages for high-current drive (up to 64 mA sink on B port) with CMOS input stages for low input current (≤0.1 mA IIH).
When both OEAB and OEBA are asserted, the device enters transparent latching mode-outputs reinforce inputs, maintaining bus states at high impedance. This behavior is enabled by internal feedback paths and requires no external storage elements, distinguishing it from standard octal transceivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and LVTTL systems without level-shifting. |
| Low-Level Output Current (IOL) | B port: 64 mA max - drives heavy capacitive loads and multiple TTL inputs without signal degradation. |
| Propagation Delay (tPHL/tPLH) | A↔B: 4.7–7.6 ns @ 5 V - supports >100 MHz bus toggle rates in synchronous backplane designs. |
| ICCZ Quiescent Current | 6–11 mA - significantly lower than bipolar-only equivalents, reducing system power in standby states. |
| Input Clamp Voltage (VIK) | −1.2 V - protects against negative transients during hot-swap or ESD events without external diodes. |
| ESD Protection | >2000 V per MIL-STD-883C Method 3015 - meets industrial-grade robustness requirements without add-on protection. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and extended-temperature embedded applications, not military or automotive. |
Pinout & Package
SN74BCT623DW uses a 20-pin SOIC (DW) package with 0.300-inch body width, JEDEC MS-013AC compliant footprint, and RoHS-compliant Cu/Ni/Pd/Au lead finish. Moisture Sensitivity Level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEAB, OEBA | Active-low enables: OEAB = A→B path; OEBA = B→A path; both low = bidirectional pass-through; both high = full isolation. |
| 2–9, 18–11 | A1–A8, B1–B8 | 8-bit parallel I/O ports: A-side TTL-compatible inputs/outputs; B-side high-drive outputs (64 mA sink); internally reinforced in latch mode. |
| 10 | GND | Power return reference for all logic and output stages; must be low-inductance connection to minimize ground bounce. |
| 20 | VCC | +5 V supply for both input and output circuitry; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output enables | Enables selective A→B or B→A data routing without bus contention; supports asymmetric timing in multi-master systems. |
| BiCMOS output stage | Delivers 64 mA sink current on B port while maintaining 0.42 V VOL at 64 mA - eliminates need for external buffer drivers. |
| Simultaneous OEAB+OEBA assertion | Activates transparent latching: outputs mirror inputs and hold state when external drivers go high-Z - useful for bus arbitration hold. |
| Low ICCZ quiescent current | 6–11 mA at VCC = 5.5 V - reduces idle power by >50% vs. equivalent bipolar transceivers, critical for fanless industrial enclosures. |
| MIL-STD-883C ESD rating | >2000 V HBM - withstands handling and board insertion without additional TVS protection in controlled environments. |
Applications
| Industrial Backplane Interface | Legacy Computer Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending ISA or VMEbus segments between controller and peripheral modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between CPU and I/O expansion cards with independent direction control per segment. Use Value: 64-mA B-port drive sustains signal integrity over 30-cm ribbon cables; dual-OE allows dynamic reconfiguration without reset. |
Use Scenario: Interfacing modern microcontroller-based subsystems to vintage 8086/80286-based motherboards in test equipment upgrades. IC Role / Device Role / Timing Role: Level-shifting and bus buffering transceiver translating between 3.3-V MCU GPIO and 5-V TTL bus voltages. Use Value: True TTL-compatible inputs accept 0.8 V/2.0 V thresholds; 0.42 V VOL ensures noise margin >0.4 V at full load. |
| Programmable Logic I/O Expansion | Test Equipment Signal Routing |
|
Use Scenario: Expanding FPGA I/O count in boundary-scan test fixtures where high-current drive is needed for DUT stimulus signals. IC Role / Device Role / Timing Role: Configurable 16-bit I/O port with direction control managed by FPGA GPIO, used as programmable digital stimulus source. Use Value: Simultaneous OEAB/OEBA enable provides glitch-free latched output state during FPGA configuration cycles. |
Use Scenario: Routing digital test patterns between pattern generator, DUT, and analyzer in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Reconfigurable signal path selector enabling dynamic test topology changes without physical rewiring. Use Value: 4.7 ns tPLH/tPHL ensures sub-5 ns channel switching latency; 20-pin SOIC fits dense ATE PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS623N | Bipolar-only design; 48 mA IOL (B port); higher ICCZ (25 mA); slower propagation (15–25 ns). | Lacks BiCMOS efficiency and speed; suitable only where cost is primary and performance margins are wide. | Choose only if legacy LS-family compatibility is mandatory and thermal/power budgets allow higher dissipation. |
| SN74ALVC164245DGGR | 3.3-V CMOS; dual-supply (A/B side independently biased); 24 mA IOL; 3.5 ns tPD; no latching mode. | Designed for mixed-voltage systems; lacks simultaneous dual-enable latching and high-current drive. | Select for low-voltage, low-power applications with voltage translation needs; not a functional replacement for SN74BCT623DW. |
Compared with SN74LS623N, SN74BCT623DW delivers 33% faster switching and 56% lower quiescent current; versus SN74ALVC164245DGGR, it provides 2.7× higher B-port drive and unique bidirectional latching-making it irreplaceable in legacy 5-V bus-hold architectures.
Availability
SN74BCT623DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy computer bus extensions, programmable logic I/O expansion, and test equipment signal routing requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT623DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT623DW belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, designed specifically for high-drive, low-quiescent-current bidirectional bus interfacing in 5-V systems where reliability and signal integrity outweigh ultra-low power demands.
FAQ
What is the maximum output current capability of the SN74BCT623DW on its B-port pins?
The SN74BCT623DW supports up to 64 mA of low-level output current (IOL) per B-port pin at VCC = 4.5 V, as specified in the recommended operating conditions table. This high drive strength allows direct interfacing with multiple TTL loads or long traces without external buffers. The SN74BCT623DW maintains a VOL of ≤0.55 V under this condition, ensuring adequate noise margin in noisy industrial environments.
Does the SN74BCT623DW support true bidirectional data flow without external control logic?
Yes, the SN74BCT623DW enables true bidirectional data flow using only its two dedicated enable inputs: OEAB controls A→B transmission, and OEBA controls B→A transmission. When OEAB is low and OEBA is high, data flows A→B; when OEBA is low and OEAB is high, data flows B→A; both high isolates both buses. No external direction-control logic is required, simplifying PCB layout and firmware design for the SN74BCT623DW.
Can the SN74BCT623DW retain bus states when all external drivers are disconnected?
Yes - when both OEAB and OEBA are asserted low, the SN74BCT623DW enters transparent latching mode: each output reinforces its corresponding input, and both A and B buses retain their last valid logic states even when all other sources enter high-impedance. This behavior is intrinsic to the SN74BCT623DW's BiCMOS feedback architecture and requires no external components or clocking.
What is the absolute maximum supply voltage rating for the SN74BCT623DW?
The absolute maximum supply voltage (VCC) for the SN74BCT623DW is −0.5 V to 7 V, as stated in the Absolute Maximum Ratings table. Operation beyond 5.5 V is not recommended for functional use, but the 7-V limit provides margin against transient overvoltage events. Exceeding this rating may cause permanent damage to the SN74BCT623DW, and TI does not guarantee functionality above 5.5 V.
Is the SN74BCT623DW RoHS-compliant and what is its moisture sensitivity level?
Yes, the SN74BCT623DW is RoHS-compliant with Green (RoHS & no Sb/Br) eco-plan, featuring Cu/Ni/Pd/Au lead finish. Its Moisture Sensitivity Level is Level-1 (260°C peak reflow, unlimited floor life at ≤30°C/60% RH), per JEDEC J-STD-020. This makes the SN74BCT623DW suitable for standard surface-mount assembly without baking requirements prior to reflow.
SN74BCT623DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 3mA, 24mA; 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
SN74BCT623DW FAQ
1.How can I place an order for SN74BCT623DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT623DW 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 SN74BCT623DW reliable?
The price and inventory of SN74BCT623DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT623DW is usually 5 days.
3.What payment methods are accepted for SN74BCT623DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT623DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT623DW?
SN74BCT623DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT623DW 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 SN74BCT623DW?
For technical support, including SN74BCT623DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT623DW requirements.
6.How does Aetrix verify that SN74BCT623DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT623DW 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 SN74BCT623DW meets industry standards.
7.What is the process for return or replacement of SN74BCT623DW?
All SN74BCT623DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT623DW, 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 SN74BCT623DW part is unused and in its original packaging.
Return procedure for SN74BCT623DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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