My Inquiry
My Account
Texas Instruments SN74HCT245DWRE4
- Part No.:
- SN74HCT245DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT245DWRE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,426
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HCT245DWRE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses. It operates at 4.5–5.5 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 14 ns (CL = 50 pF), and supports TTL-compatible inputs-commonly used in industrial backplane and ribbon-cable interconnects where signal integrity and bus isolation are critical.
For engineers reviewing the SN74HCT245DWRE4 datasheet, SN74HCT245DWRE4 pinout, SN74HCT245DWRE4 application, or SN74HCT245DWRE4 equivalent, key selection criteria include its 3-state bidirectional control architecture, SOIC-20 package compatibility, 80 µA max ICC static current, and verified operation across –40°C to +85°C industrial temperature range.
Technical Context
The SN74HCT245DWRE4 implements a dual-rail CMOS logic design with active-low output enable (OE) and direction control (DIR) pins that determine data flow direction (A→B or B→A). Its 3-state outputs support high-current drive (±6 mA) while maintaining TTL voltage compatibility on all inputs.
It features balanced propagation delay (14 ns typ. at 5.5 V, CL = 50 pF), low input current (≤1 µA), and robust ESD protection (±1500 V HBM). The device isolates buses when OE is high and avoids contention via strict functional mode control per its truth table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation under standard 5-V rail tolerances without external regulation |
| Propagation Delay | 14 ns typical (VCC = 5.5 V, CL = 50 pF) - enables reliable timing in 30+ MHz digital bus systems |
| Output Drive | ±6 mA at 5 V - directly drives up to 15 LSTTL loads without external buffers |
| Static Supply Current | 80 µA maximum - minimizes quiescent power in always-on industrial control modules |
| Input Compatibility | TTL-voltage compatible - interfaces seamlessly with legacy 5-V microcontrollers and FPGAs |
| Operating Temperature | –40°C to +85°C - certified for industrial-grade embedded applications including motor drives and factory automation |
| ESD Rating | ±1500 V HBM - meets JEDEC JS-001 for robust handling in manufacturing and field environments |
Pinout & Package
SN74HCT245DWRE4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with gull-wing leads and standard 0.050″ (1.27 mm) pitch. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A-to-B data flow; Low = B-to-A - enables dynamic bus arbitration in master-slave topologies |
| 2–9 (A1–A8) | Port A I/O channels | Bidirectional data terminals tied to local bus; function as inputs or outputs based on DIR state |
| 10 (GND) | Ground reference | Common return path for logic and switching currents; must be low-impedance for noise suppression |
| 11–18 (B1–B8) | Port B I/O channels | Bidirectional data terminals tied to remote bus; mirror A-side behavior under DIR control |
| 19 (OE) | Active-low output enable | High = all A/B ports enter high-impedance state - provides clean bus isolation during standby or conflict avoidance |
| 20 (VCC) | Power supply | 5-V nominal supply; requires local 0.1 µF bypass capacitor to suppress switching transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus isolation | Enables safe, contention-free communication between independent 8-bit data domains using single DIR/OE control |
| High-current 3-state outputs | ±6 mA drive capability eliminates need for external line drivers in ribbon-cable and backplane applications |
| Low static power consumption | 80 µA max ICC allows integration into power-sensitive industrial controllers without thermal derating |
| TTL-compatible inputs | Accepts standard 0.8 V / 2.0 V logic thresholds - interoperable with legacy 5-V logic families without level-shifting |
| Industrial temperature range | Rated for –40°C to +85°C operation - suitable for deployment in motor drives, PLCs, and telecom infrastructure equipment |
Applications
| Factory Automation and Control | Telecom Infrastructure |
|---|---|
Use Scenario: Interfacing programmable logic controllers (PLCs) with distributed I/O modules over extended ribbon cables. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing signal amplification and direction-controlled data routing between controller and remote sensors/actuators. Use Value: Maintains signal integrity across 1–2 m cables by driving 15 LSTTL loads, reducing bit errors in noisy factory environments. | Use Scenario: Backplane data coupling between line cards and switch fabric in modular telecom chassis. IC Role / Device Role / Timing Role: Isolating and strengthening parallel address/data buses between hot-swappable boards operating at 5 V. Use Value: Enables deterministic 14 ns propagation delay and bus contention avoidance via OE-controlled 3-state outputs during card insertion/removal. |
| Multi-Function Printers | Motor Drives |
Use Scenario: Bridging main controller MCU and peripheral subsystems (scanner, paper feed, print head) sharing a common 8-bit data bus. IC Role / Device Role / Timing Role: Direction-selectable transceiver managing bidirectional firmware updates and status reporting across isolated bus segments. Use Value: Supports simultaneous high-speed data transfer and real-time fault signaling without bus lock-up, thanks to fast enable/disable times (≤52 ns). | Use Scenario: Connecting motion controller FPGA outputs to isolated gate driver stages in servo amplifier designs. IC Role / Device Role / Timing Role: Level-translating and buffering control signals (enable, direction, step) between logic domain and power stage interface. Use Value: Prevents ground-loop interference and ensures clean edge transitions into capacitive gate loads via ±6 mA drive and low input current (≤1 µA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245DWR | Same SOIC-20 package, identical electrical specs, but lacks E4 suffix indicating TI's enhanced quality screening (e.g., extended burn-in, tighter AC test limits) | Suitable for non-safety-critical commercial designs where full industrial qualification is not required | Select SN74HCT245DWR only if cost sensitivity outweighs need for TI's enhanced reliability testing. |
| 74HCT245PW | TSSOP-20 package (6.5 mm × 4.4 mm); same logic function and DC specs, but higher thermal resistance (RθJA = 94.9°C/W vs. 70.4°C/W for DW) | Better suited for space-constrained PCBs; requires careful thermal layout due to reduced heat dissipation capability | Choose 74HCT245PW only when board area is primary constraint and ambient temperature remains below 70°C. |
Compared with SN74HCT245DWR and 74HCT245PW, the SN74HCT245DWRE4 offers verified industrial reliability screening and superior thermal performance in the widely adopted SOIC-20 footprint-making it optimal for long-lifecycle industrial deployments requiring consistent yield and field stability.
Availability
SN74HCT245DWRE4 is available at Aetrix Electronics and suitable for factory automation and control, telecom infrastructure, and motor drive applications requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature compliance.
Supply support for SN74HCT245DWRE4 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 for industrial, automotive, and communications markets.
The SN74HCT245 family was developed to provide robust, pin-compatible bus transceivers for 5-V systems requiring bidirectional isolation, high noise immunity, and seamless integration with TTL and CMOS logic domains.
FAQ
What is the maximum operating temperature for SN74HCT245DWRE4?
The SN74HCT245DWRE4 is rated for continuous operation from –40°C to +85°C. This industrial temperature range is validated per TI's production test flow and supports deployment in motor drives, PLCs, and outdoor telecom enclosures where ambient conditions exceed commercial limits. The SOIC-20 package's RθJA of 70.4°C/W ensures thermal margin under typical 80 µA ICC loading.
Does SN74HCT245DWRE4 require external pull-up resistors on DIR or OE pins?
No, SN74HCT245DWRE4 does not require external pull-up resistors on DIR or OE. Its CMOS inputs draw ≤1 µA, and internal design allows direct connection to VCC or GND for static control. However, floating inputs must be avoided: unused DIR/OE lines should be tied to VCC (for default A→B) or GND (for default B→A), per TI application note SCBA004.
Can SN74HCT245DWRE4 interface directly with 3.3-V logic devices?
SN74HCT245DWRE4 is not 3.3-V tolerant. Its inputs are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max) but require a 4.5–5.5 V supply. Direct connection to 3.3-V outputs risks violating VIH/VIL margins and may cause unreliable switching. A level-shifter or 3.3-V–to–5-V translator is required for mixed-voltage systems.
What is the purpose of the E4 suffix in SN74HCT245DWRE4?
TI's E4 suffix denotes enhanced product screening: extended burn-in, tighter AC parametric limits, and additional reliability stress tests beyond standard commercial qualification. This makes SN74HCT245DWRE4 appropriate for industrial applications demanding higher confidence in long-term field performance and reduced infant mortality rates.
How does SN74HCT245DWRE4 prevent bus contention during direction switching?
SN74HCT245DWRE4 prevents bus contention by enforcing strict functional mode sequencing: OE must be asserted (high) before changing DIR state, ensuring both A and B ports enter high-impedance simultaneously. Its truth table mandates that only one direction is active per DIR level, and OE override takes precedence-eliminating race conditions during bidirectional handshaking.
SN74HCT245DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT245DWRE4 FAQ
1.How can I place an order for SN74HCT245DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245DWRE4 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 SN74HCT245DWRE4 reliable?
The price and inventory of SN74HCT245DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74HCT245DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT245DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT245DWRE4?
SN74HCT245DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245DWRE4 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 SN74HCT245DWRE4?
For technical support, including SN74HCT245DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245DWRE4 requirements.
6.How does Aetrix verify that SN74HCT245DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT245DWRE4 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 SN74HCT245DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74HCT245DWRE4?
All SN74HCT245DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245DWRE4, 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 SN74HCT245DWRE4 part is unused and in its original packaging.
Return procedure for SN74HCT245DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HCT245DWRE4 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…
