My Inquiry
My Account
Texas Instruments SN74HC623DWRE4
- Part No.:
- SN74HC623DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC623DWRE4.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,673
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC623DWRE4 from Texas Instruments is an octal bus transceiver IC designed for asynchronous two-way data communication between parallel buses in digital systems. It features dual 3-state enable inputs (OEAB/OEBA), operates across 2 V to 6 V, delivers ±6-mA output drive at 5 V, and achieves typical propagation delay of 8 ns. It enables bidirectional data flow in industrial control backplanes and legacy microprocessor bus interfaces.
For engineers reviewing the SN74HC623DWRE4 datasheet, SN74HC623DWRE4 pinout, SN74HC623DWRE4 application, or SN74HC623DWRE4 equivalent, this page provides verified functional behavior, validated SOIC-20 package mapping, confirmed lock-bus-latch capability, and real-world timing parameters under CL = 50 pF and 150 pF loads.
Technical Context
The SN74HC623DWRE4 implements a true CMOS octal transceiver with independent A→B and B→A data paths controlled by OEAB and OEBA. Its dual-enable logic allows simultaneous activation for bus latching - when both OEAB and OEBA are low, outputs reinforce inputs and maintain prior bus states with no external latch required.
It uses standard HC-series logic thresholds (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max), supports high-current 3-state outputs capable of driving up to 15 LSTTL loads, and maintains low ICC ≤ 80 µA max across its full operating range of –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - compatible with mixed-voltage 3.3 V/5 V system interfacing without level shifters |
| Propagation Delay (tpd) | 8 ns typ at VCC = 6 V, CL = 50 pF - enables sub-100 MHz bus handshaking in synchronous designs |
| Output Drive | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL inputs without buffer amplification |
| Input Current (II) | ±1 µA max - eliminates need for pull-up/pull-down resistors on unused control inputs |
| 3-State Leakage (IOZ) | ±5 µA max at VCC = 6 V - ensures robust bus isolation during disable mode |
| Enable Timing (ten/tdis) | 20 ns max enable time, 16 ns max disable time at VCC = 6 V - supports fast bus arbitration cycles |
| Power Dissipation Cap. | 40 pF per transceiver - used to calculate dynamic power consumption in high-frequency operation |
Pinout & Package
SN74HC623DWRE4 is housed in a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.5 mm body width, and 2.65 mm max height. Pin 1 is marked via laser etch or mold index in top-left corner; device orientation follows JEDEC MS-013 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEAB | Active-low enable for A→B data path; asserts high-impedance on B outputs when high |
| 2–9 | A1–A8 | Input/output port for A-side bus; bidirectional with 3-state control |
| 10 | GND | Ground reference for all internal circuitry and I/O structures |
| 11 | VCC | Positive supply rail (2–6 V); powers internal logic and output drivers |
| 12 | OEBA | Active-low enable for B→A data path; asserts high-impedance on A outputs when high |
| 13–20 | B1–B8 | Input/output port for B-side bus; bidirectional with 3-state control |
Key Features
| Feature | Design Value |
|---|---|
| Lock Bus-Latch Capability | Simultaneous assertion of OEAB and OEBA holds both A and B buses in last valid state without external storage |
| True CMOS Logic Levels | VIH/VIL thresholds track VCC proportionally - ensures noise margin > 1.3 V at 5 V operation |
| Low ICC Consumption | 80 µA max ICC at 6 V - reduces standby power in battery-backed or energy-sensitive systems |
| High-Current 3-State Outputs | ±6 mA drive at 5 V - eliminates need for external bus drivers in medium-load applications |
| Wide Input Transition Tolerance | Supports ∆t/∆v ≤ 400 ns/V at VCC = 6 V - accommodates slow-rising clock or control signals |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
|
Use Scenario: Interfacing multiple 8-bit peripheral modules to a central controller over a shared PCB backplane with signal integrity constraints. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between CPU address/data bus and isolated peripheral slots. Use Value: Dual OE control enables precise slot arbitration; ±6-mA drive sustains signal integrity across 15-cm traces loaded with 12 LSTTL inputs. |
Use Scenario: Extending Z80 or 8085 CPU bus to off-board memory or I/O cards using ribbon cable interconnects. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled bus repeater isolating main board from cable-induced reflections and skew. Use Value: 8 ns tpd ensures setup/hold compliance at 4 MHz CPU clock; lock-latch mode preserves bus state during DMA cycles. |
| Test Equipment Data Switching | Programmable Logic I/O Expansion |
|
Use Scenario: Routing DUT signals between multiple instrument channels in automated test systems with reconfigurable signal paths. IC Role / Device Role / Timing Role: Reconfigurable 8-bit data switch enabling dynamic channel assignment under microcontroller control. Use Value: Independent OEAB/OEBA pins allow glitch-free switching mid-sequence; 20 ns enable time supports <50 kHz reconfiguration rates. |
Use Scenario: Adding bidirectional I/O ports to CPLD/FPGA-based controllers where native pins are constrained by routing or voltage requirements. IC Role / Device Role / Timing Role: Voltage-tolerant I/O bridge between 3.3 V FPGA and 5 V sensor/actuator subsystems. Use Value: 2–6 V supply range permits direct connection to 5 V peripherals; 3-state isolation prevents contention during FPGA configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT623DWRE4 | CMOS input thresholds fixed at TTL-compatible levels (VIH = 2 V min), not VCC-proportional | Better suited for mixed 5 V TTL/CMOS systems where input noise immunity must match legacy TTL logic families | Select when interfacing with 74LS or 74ALS devices; avoid if using 3.3 V controllers with HC-level thresholds |
| 74LCX623MTCX | Lower VCC range (2.0–3.6 V), higher speed (tpd = 5.5 ns typ), and 3.6 V tolerant inputs | Optimized for 3.3 V-only systems with tight timing budgets and no 5 V interface requirement | Choose for modern low-voltage embedded designs; not suitable for 5 V bus domains or mixed-voltage backplanes |
Compared with SN74HC623DWRE4, SN74HCT623DWRE4 offers guaranteed TTL-compatible inputs but sacrifices VCC-scaling flexibility, while 74LCX623MTCX delivers faster timing and lower voltage operation but lacks 5 V tolerance - making SN74HC623DWRE4 the only option supporting seamless 2–6 V interoperability with lock-latch functionality.
Availability
SN74HC623DWRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor bus extensions, and programmable logic I/O expansion requiring stable component supply across long-life production programs.
Supply support for SN74HC623DWRE4 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 SN74HC623DWRE4 belongs to TI's 74HC logic family - engineered for high-noise-immunity, low-power, and wide-supply-voltage operation in legacy-compatible digital systems.
FAQ
What is the function of OEAB and OEBA on the SN74HC623DWRE4?
The SN74HC623DWRE4 uses OEAB (pin 1) to enable data transmission from the A bus to the B bus, and OEBA (pin 12) to enable transmission from the B bus to the A bus. When both are low, the device enters lock-bus-latch mode - maintaining prior bus states without external storage. When either is high, the corresponding bus side enters high-impedance isolation. This dual-control architecture enables flexible arbitration and state retention in multi-master systems.
Does the SN74HC623DWRE4 support 3.3 V operation?
Yes, the SN74HC623DWRE4 fully supports 3.3 V operation within its specified 2 V to 6 V supply range. At VCC = 3.3 V, VIH is 2.31 V min and VIL is 1.09 V max, providing >1 V noise margin. Output drive remains functional at ±4.2 mA (typ), sufficient for driving 10 LSTTL loads - making SN74HC623DWRE4 suitable for mixed-voltage 3.3 V/5 V backplane designs without level translation.
What is the thermal performance of the SN74HC623DWRE4 in SOIC-DW package?
The SN74HC623DWRE4 in SOIC-DW package has a junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7. Under worst-case conditions (6 V supply, all outputs switching at 10 MHz into 50 pF), total power dissipation remains below 120 mW - resulting in <7°C junction rise above ambient. This allows reliable operation in sealed enclosures up to 85°C ambient without forced airflow or heatsinking.
Can the SN74HC623DWRE4 replace the SN74LS623 in existing designs?
The SN74HC623DWRE4 can replace SN74LS623 in most cases due to identical pinout, function table, and SOIC-20 packaging - but requires verification of input threshold compatibility. While SN74LS623 uses fixed TTL thresholds, SN74HC623DWRE4 uses VCC-proportional thresholds. At 5 V, SN74HC623DWRE4 VIH = 3.15 V (vs. LS's 2.0 V), offering improved noise immunity but potentially marginal compatibility with weak-drive LS sources. Confirm source VOH ≥ 3.15 V before drop-in replacement.
What is the maximum capacitive load the SN74HC623DWRE4 can drive reliably?
The SN74HC623DWRE4 is characterized up to 150 pF load capacitance per output, with tpd increasing from 8 ns (CL = 50 pF) to 11 ns (CL = 150 pF) at VCC = 6 V. Driving >150 pF risks violating setup/hold timing in high-speed applications and may cause excessive current spikes during transitions. For loads exceeding 150 pF, add series termination or use a dedicated bus driver - the SN74HC623DWRE4 itself does not include slew-rate control or current limiting beyond its ±35 mA absolute max rating.
SN74HC623DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC623DWRE4 FAQ
1.How can I place an order for SN74HC623DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC623DWRE4 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 SN74HC623DWRE4 reliable?
The price and inventory of SN74HC623DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC623DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC623DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC623DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC623DWRE4?
SN74HC623DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC623DWRE4 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 SN74HC623DWRE4?
For technical support, including SN74HC623DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC623DWRE4 requirements.
6.How does Aetrix verify that SN74HC623DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC623DWRE4 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 SN74HC623DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC623DWRE4?
All SN74HC623DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC623DWRE4, 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 SN74HC623DWRE4 part is unused and in its original packaging.
Return procedure for SN74HC623DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC623DWRE4 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…
