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Texas Instruments SN74HCT245PWRG4
- Part No.:
- SN74HCT245PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT245PWRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,245
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Product details
Overview
SN74HCT245PWRG4 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 - enabling robust signal integrity in industrial backplane and ribbon-cable interconnects.
For engineers reviewing the SN74HCT245PWRG4 datasheet, SN74HCT245PWRG4 pinout, SN74HCT245PWRG4 application, or SN74HCT245PWRG4 equivalent, key selection criteria include direction-control logic level behavior, 3-state enable timing (ten/tdis), bus isolation capability under OE high, and compatibility with 15-LSTTL loads in 5-V logic systems.
Technical Context
The SN74HCT245PWRG4 implements a standard '245 logic function with active-low output enable (OE) and unidirectional direction control (DIR). Its dual-bus architecture allows A→B or B→A data flow depending on DIR state, while OE independently places all I/Os into high-impedance mode to isolate buses.
It uses HCMOS technology with TTL-voltage compatible inputs, balanced ±6 mA drive strength, and low static ICC (≤80 µA). The device features center-aligned VCC/GND pins to minimize switching noise and supports load capacitances up to 150 pF with verified timing performance across –40°C to +85°C.
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 without external regulation. |
| Propagation Delay (tpd) | 14 ns typical (CL = 50 pF, VCC = 5.5 V) - enables reliable 35+ MHz data throughput in synchronous bus interfaces. |
| Output Drive | ±6 mA at 5 V - directly drives up to 15 LSTTL loads without external buffers, reducing component count. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max) - interoperates seamlessly with legacy 5-V TTL and CMOS logic families. |
| Static Supply Current | 80 µA maximum - minimizes quiescent power in always-on industrial control modules. |
| 3-State Enable/Disable Time | ten = 52 ns max, tdis = 45 ns max (CL = 50 pF) - guarantees clean bus arbitration and prevents contention during direction switching. |
| ESD Rating | ±1500 V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | High = A-to-B data flow; Low = B-to-A - determines real-time bus communication direction without clocking. |
| 2–9 A1–A8 | Port A bidirectional I/O | Connects to local bus (e.g., MCU or FPGA side); functions as input or output based on DIR state. |
| 10 GND | Ground reference | Primary return path for all signals; center placement reduces ground bounce in high-speed switching. |
| 11–18 B1–B8 | Port B bidirectional I/O | Connects to remote bus (e.g., peripheral or backplane side); mirrors A-port functionality with opposite directionality. |
| 19 OE | Active-low output enable | High = all A/B ports in high-Z; Low = transceiver enabled - provides hardware-level bus isolation for multi-master systems. |
| 20 VCC | Power supply | +4.5 V to +5.5 V supply; center-aligned with GND to suppress simultaneous switching noise (SSN). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus isolation | Independent DIR and OE controls allow dynamic direction switching and complete bus decoupling - essential for hot-swap and multi-drop topologies. |
| High-current 3-state outputs | ±6 mA drive at 5 V sustains signal integrity over long traces or ribbon cables, eliminating need for discrete buffer stages. |
| Low static power consumption | 80 µA max ICC enables use in power-constrained industrial nodes where standby current impacts thermal design. |
| TTL-compatible inputs | VIH ≥ 2 V and VIL ≤ 0.8 V ensure direct interfacing with legacy 5-V logic without level-shifting components. |
| Controlled switching characteristics | Specified ten/tdis (enable/disable times) prevent bus contention during state transitions - critical for deterministic system timing. |
Applications
| Factory Automation | Telecom Infrastructure |
|---|---|
|
Use Scenario: Isolating PLC CPU bus from distributed I/O modules connected via 1–2 m ribbon cables. IC Role / Device Role / Timing Role: Bidirectional signal repeater and bus driver that compensates for cable attenuation and skew. Use Value: Enables reliable 10–20 MHz data exchange between controller and remote terminals without signal degradation. |
Use Scenario: Interfacing baseband processor to line-card peripherals in modular telecom chassis. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver managing shared control/data paths between master and slave cards. Use Value: Provides deterministic bus arbitration and isolation during firmware updates or card hot-plug events. |
| Multi-Function Printers | Motor Drives |
|
Use Scenario: Bridging main controller SoC to ASIC-based print engine subsystem over 150-mm PCB trace. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening transceiver for parallel command/data bus. Use Value: Maintains clean digital edges at 8–12 MHz, preventing misreads in high-speed page rasterization. |
Use Scenario: Connecting motion controller to isolated gate-driver boards in servo amplifier modules. IC Role / Device Role / Timing Role: Galvanically isolated bus interface (when paired with optocouplers) for status/command exchange. Use Value: Ensures glitch-free direction and enable signaling to prevent shoot-through in half-bridge drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245PW | Same logic function and pinout, but obsolete per TI documentation; no new production shipments. | Not suitable for new designs requiring long-term supply continuity. | Select SN74HCT245PWRG4 for active production support and guaranteed availability. |
| 74ACT245SCX | Higher speed (tpd ≈ 9 ns), wider VCC range (4.5–5.5 V), but higher ICC (120 µA max) and lower noise immunity (VIH = 3.5 V min). | Better for high-frequency timing-critical links; less tolerant of marginal TTL input levels. | Choose SN74HCT245PWRG4 when TTL compatibility, low static power, and industrial temperature range are prioritized. |
Compared with SN74HCT245PW and 74ACT245SCX, the SN74HCT245PWRG4 offers optimal balance of proven reliability, TTL interoperability, and supply-chain stability for industrial embedded systems - especially where backward compatibility and long-lifecycle support are mandatory.
Availability
SN74HCT245PWRG4 is available at Aetrix Electronics and suitable for factory automation, telecom infrastructure, and motor drive applications requiring stable component supply, extended temperature operation (–40°C to +85°C), and RoHS-compliant packaging.
Supply support for SN74HCT245PWRG4 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 experience in industrial-grade logic ICs.
The SN74HCT245PWRG4 belongs to TI's HCT logic family, engineered for robust 5-V system interfacing - targeting applications demanding TTL compatibility, low power, and high-noise immunity in harsh environments.
FAQ
What is the operating temperature range for SN74HCT245PWRG4?
The SN74HCT245PWRG4 is rated for operation from –40°C to +85°C, matching the commercial-industrial temperature grade defined in its recommended operating conditions. This range supports deployment in enclosed control cabinets, outdoor telecom enclosures, and factory-floor equipment without derating.
Does SN74HCT245PWRG4 support bidirectional data flow on the same pins?
Yes - the SN74HCT245PWRG4 uses true bidirectional I/O ports (A1–A8 and B1–B8), where each pin functions as input or output depending on the logic level applied to the DIR pin. No external direction logic or multiplexing is required.
How does the OE pin behave when driven high on SN74HCT245PWRG4?
When OE is driven high, all A- and B-port outputs enter high-impedance (3-state) mode regardless of DIR state or data activity - effectively isolating both buses. Inputs remain functional, so DIR and data lines retain valid logic states during isolation.
Can SN74HCT245PWRG4 drive 15 LSTTL loads directly?
Yes - the SN74HCT245PWRG4 is explicitly characterized to drive up to 15 LSTTL loads per output, verified by its ±6 mA output drive specification at 5 V and guaranteed VOL ≤ 0.33 V under 6 mA sink conditions.
Is SN74HCT245PWRG4 pin-compatible with other TSSOP-20 octal transceivers?
SN74HCT245PWRG4 follows the industry-standard '245 pinout for TSSOP-20 packages. It is pin-compatible with SN74HCT245PWR and SN74HCT245PW (same footprint), though the latter two are obsolete or inactive per TI's orderable addendum.
SN74HCT245PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74HCT245PWRG4 FAQ
1.How can I place an order for SN74HCT245PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245PWRG4 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 SN74HCT245PWRG4 reliable?
The price and inventory of SN74HCT245PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74HCT245PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT245PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT245PWRG4?
SN74HCT245PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245PWRG4 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 SN74HCT245PWRG4?
For technical support, including SN74HCT245PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245PWRG4 requirements.
6.How does Aetrix verify that SN74HCT245PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT245PWRG4 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 SN74HCT245PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT245PWRG4?
All SN74HCT245PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245PWRG4, 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 SN74HCT245PWRG4 part is unused and in its original packaging.
Return procedure for SN74HCT245PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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