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Texas Instruments SN74HC245DWRG4
- Part No.:
- SN74HC245DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC245DWRG4.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
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Product details
Overview
SN74HC245DWRG4 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 across 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns (VCC = 6 V, CL = 50 pF), and supports isolation via independent DIR and OE controls-used in PC motherboard I/O buffering and server backplane interface circuits.
For engineers reviewing the SN74HC245DWRG4 datasheet, SN74HC245DWRG4 pinout, SN74HC245DWRG4 application, or SN74HC245DWRG4 equivalent, key selection criteria include its wide supply range (2–6 V), 3-state bus isolation capability, low ICC (≤80 µA), input current ≤1 µA, and compatibility with LSTTL loads (up to 15 units).
Technical Context
The SN74HC245DWRG4 implements dual-control logic: DIR selects data direction (A→B or B→A), while OE independently enables or disables all outputs into high-impedance state-enabling true bus isolation without affecting internal logic states. Its CMOS design ensures balanced rise/fall times and reduced output ringing, critical for noise-sensitive digital interconnects.
It features rail-to-rail input thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC), operates over –40°C to +85°C, and meets JEDEC JESD22-C101 (CDM ±1000 V) and JS-001 (HBM ±3000 V) ESD standards. Thermal resistance RθJA is 77.0°C/W in SOIC (DW) package, supporting reliable operation under sustained 8-bit bus loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables direct interfacing between 3.3 V and 5 V domains without level shifters. |
| Propagation Delay (tpd) | 12 ns typical at VCC = 6 V, CL = 50 pF - supports >30 MHz bus toggle rates in synchronous systems. |
| Output Drive | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or terminate short PCB traces. |
| Quiescent Current (ICC) | 80 µA max - minimizes standby power in battery-backed or always-on embedded controllers. |
| Input Current | 1 µA max - eliminates need for external pull-up/down resistors on DIR/OE in low-power sleep modes. |
| ESD Rating | HBM ±3000 V, CDM ±1000 V - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
SN74HC245DWRG4 uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.050″ (1.27 mm) lead pitch and RoHS-compliant NiPdAu lead finish. It is rated MSL Level-1 (unlimited floor life) and compatible with standard reflow profiles up to 260°C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Low = B→A data flow; High = A→B data flow - determines real-time bus direction without clock or timing constraints. |
| 2–9 A1–A8 | Port A I/O terminals | Bi-directional data lines tied to one bus segment; internally isolated when OE = High. |
| 10 GND | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
| 11–18 B1–B8 | Port B I/O terminals | Bi-directional data lines tied to second bus segment; functionally identical to A-side but electrically isolated. |
| 19 OE | Output enable input | Active-Low: OE = Low enables transceiver; OE = High forces all A/B pins into high-Z - enables multi-drop bus arbitration. |
| 20 VCC | Power supply | Single 2–6 V supply powers both input and output stages; requires local 0.1 µF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Supports mixed-voltage system integration-e.g., 3.3 V microcontroller communicating with 5 V peripheral bus. |
| Independent DIR and OE controls | Enables dynamic direction switching and bus isolation in separate clock cycles-critical for DMA and shared-memory architectures. |
| Low ICC (≤80 µA) | Reduces system-level quiescent power by >95% vs. bipolar transceivers-ideal for energy-constrained edge nodes. |
| High-impedance off-state leakage (≤0.5 µA) | Prevents signal corruption during hot-swap or partial-power-down sequences in modular computing systems. |
| Slow edge-rate optimization | Minimizes overshoot/undershoot on unterminated or lightly loaded PCB traces-reduces need for series termination resistors. |
Applications
| PC Motherboard I/O Buffering | Server Backplane Interface |
|---|---|
Use Scenario: Isolating legacy ISA or LPC bus segments from modern southbridge logic while maintaining signal integrity across long traces. IC Role / Device Role / Timing Role: Bidirectional level-tolerant buffer managing data flow between chipset and Super I/O controller with independent direction and enable control. Use Value: Eliminates need for discrete level shifters and reduces board space by consolidating eight channels in one SOIC-20 package. |
Use Scenario: Interfacing hot-pluggable line cards to central switch fabric in 1U rack-mounted servers. IC Role / Device Role / Timing Role: Bus isolator enabling safe insertion/removal of modules without disrupting active data paths on shared backplane. Use Value: OE-controlled high-Z state prevents bus contention during card insertion; ±6 mA drive sustains signal integrity across 10+ inch FR4 traces. |
| Industrial PLC Communication Module | Embedded Medical Data Acquisition |
Use Scenario: Bridging isolated RS-485 transceiver outputs to microcontroller GPIO banks in programmable logic controllers. IC Role / Device Role / Timing Role: Direction-managed data conduit synchronizing command/response packets between isolated UART and host MCU. Use Value: DIR pin allows single hardware configuration to support both master-initiated reads and slave-initiated alarms without firmware reconfiguration. |
Use Scenario: Routing sensor ADC outputs and actuator control signals between ARM Cortex-M4 and analog front-end in portable ECG monitors. IC Role / Device Role / Timing Role: Low-power bidirectional data gate managing time-critical waveform streaming while minimizing standby current draw. Use Value: 80 µA max ICC extends battery life in Class II medical devices requiring >72-hour continuous operation between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65–3.6 V); faster tpd (6.3 ns @ 3.3 V); higher drive (±24 mA) | Optimized for 3.3 V-only systems; unsuitable for 5 V bus interfacing without external translation | Select when operating exclusively in 3.3 V domain and requiring higher speed or drive strength. |
| 74ACT245 | Higher VCC (4.5–5.5 V); TTL-compatible inputs; higher ICC (40 mA typical); faster tpd (6 ns @ 5 V) | Designed for legacy 5 V TTL systems; consumes significantly more power and lacks 2–6 V flexibility | Choose only for drop-in replacement in existing 5 V TTL designs where HC-family timing margins are insufficient. |
Compared with SN74HC245DWRG4, SN74LVC245A offers superior speed and drive in narrow-voltage systems but forfeits 5 V interoperability, while 74ACT245 provides raw performance in pure 5 V environments at the cost of power efficiency and voltage adaptability.
Availability
SN74HC245DWRG4 is available at Aetrix Electronics and suitable for PC motherboard I/O buffering, server backplane interface, and industrial PLC communication modules requiring stable component supply across extended production lifecycles.
Supply support for SN74HC245DWRG4 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.
SN74HC245DWRG4 belongs to TI's 74HC high-speed CMOS logic portfolio, engineered for robust bidirectional bus interfacing in mixed-voltage industrial, computing, and communications equipment.
FAQ
What is the maximum operating temperature for SN74HC245DWRG4?
The SN74HC245DWRG4 is rated for operation from –40°C to +85°C ambient temperature, matching the commercial temperature grade specified in its SOIC (DW) package documentation. This range supports deployment in desktop PCs, network switches, and industrial control panels without derating. The device's thermal resistance (RθJA = 77.0°C/W) ensures junction temperatures remain within safe limits under typical 8-bit bus loading conditions at maximum ambient.
Does SN74HC245DWRG4 support 3.3 V and 5 V logic levels simultaneously?
Yes, SN74HC245DWRG4 supports mixed-voltage operation: its 2–6 V supply range allows it to interface 3.3 V logic on one bus (e.g., A-side) and 5 V logic on the other (e.g., B-side), provided both sides share a common ground. Input thresholds scale with VCC (VIH ≈ 0.7×VCC), so a 3.3 V signal applied to a 5 V-powered SN74HC245DWRG4 meets VIH requirement (2.31 V), and vice versa-no external level shifters required.
How does the OE pin function on SN74HC245DWRG4?
The OE (Output Enable) pin on SN74HC245DWRG4 is an active-low control that places all A- and B-side I/Os into high-impedance state when driven High, effectively isolating both buses. When OE is Low, the transceiver operates normally under DIR control. To ensure high-Z state during power-up, TI recommends tying OE to VCC via a pull-up resistor-minimum value determined by driver sink capability, typically 10 kΩ for most microcontrollers.
Can SN74HC245DWRG4 drive 15 LSTTL loads as stated in its datasheet?
Yes, SN74HC245DWRG4 is specified to drive up to 15 LSTTL loads per output, verified at VCC = 5 V with IOH = –6 mA and IOL = 6 mA. This capability stems from its ±6 mA output drive strength and low VOL (≤0.26 V) and VOH (≥3.7 V) under load. However, total device current must stay within 75 mA limit, so simultaneous full-load driving across all eight outputs requires careful thermal and layout consideration.
Is SN74HC245DWRG4 pin-compatible with other 74HC245 variants in SOIC packages?
Yes, SN74HC245DWRG4 shares identical pinout, footprint, and electrical behavior with all SOIC-20 variants of the 74HC245 family-including SN74HC245DWR, SN74HC245DWRE4, and SN74HC245DW. The "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant NiPdAu finish), with no functional or mechanical differences affecting PCB layout or schematic symbol usage.
SN74HC245DWRG4 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:
- 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:
- 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
SN74HC245DWRG4 FAQ
1.How can I place an order for SN74HC245DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC245DWRG4 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 SN74HC245DWRG4 reliable?
The price and inventory of SN74HC245DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC245DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74HC245DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC245DWRG4 transactions.
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4.How is shipping managed for SN74HC245DWRG4?
SN74HC245DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC245DWRG4 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 SN74HC245DWRG4?
For technical support, including SN74HC245DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC245DWRG4 requirements.
6.How does Aetrix verify that SN74HC245DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC245DWRG4 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 SN74HC245DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC245DWRG4?
All SN74HC245DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC245DWRG4, 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 SN74HC245DWRG4 part is unused and in its original packaging.
Return procedure for SN74HC245DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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