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Texas Instruments SN74HCT245NE4
- Part No.:
- SN74HCT245NE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HCT245NE4.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:3,362
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Product details
Overview
SN74HCT245NE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V logic systems. It features ±6-mA output drive at 5 V, 14-ns typical propagation delay (VCC = 5.5 V), and operates across –40°C to +85°C. It serves as a high-current buffer in ribbon-cable interconnects between MCUs and peripheral modules.
For engineers reviewing the SN74HCT245NE4 datasheet, SN74HCT245NE4 pinout, SN74HCT245NE4 application, or SN74HCT245NE4 equivalent, key selection criteria include direction-control logic polarity, 3-state enable timing (ten/tdis ≤ 52 ns), TTL-compatible input thresholds, and PDIP-20 package compatibility with legacy through-hole PCB layouts.
Technical Context
The SN74HCT245NE4 implements a standard '245 logic function using HCMOS technology with TTL-voltage-compatible inputs. Its DIR pin controls data flow direction (DIR = H: A→B; DIR = L: B→A), while active-low OE enables or isolates all eight bidirectional I/O channels simultaneously.
It operates strictly within 4.5 V–5.5 V supply range and delivers balanced switching performance: tpd = 14 ns (typ, CL = 50 pF, VCC = 5.5 V), ten = 52 ns (max), tdis = 45 ns (max). Input leakage is ≤1 µA, and off-state output current is ≤0.5 µA - enabling low-noise bus isolation in mixed-signal industrial backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation under 5-V rail tolerance (±10%) without level-shifting circuitry |
| Propagation Delay (tpd) | 14 ns typical (VCC = 5.5 V, CL = 50 pF) - supports 35-MHz sustained data throughput in synchronous bus interfaces |
| Output Drive | ±6 mA at 5 V - directly drives up to 15 LSTTL loads, eliminating need for external line drivers in legacy systems |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max) - interoperates with 74LS, 74ALS, and microcontroller GPIO without interface logic |
| Quiescent Current | 80 µA maximum - enables low-static-power operation in always-on industrial control modules |
| Operating Temperature | –40°C to +85°C - qualified for commercial/industrial environments including factory automation and point-of-sale terminals |
| ESD Rating | ±1500 V HBM - meets standard handling requirements for assembly in non-classified production lines |
Pinout & Package
SN74HCT245NE4 is packaged in a 20-pin plastic dual in-line package (PDIP-N), with 24.33 mm × 6.35 mm body size and through-hole mounting. Pin 10 is GND, pin 20 is VCC, and center-aligned power/ground pins minimize switching noise coupling.
| 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 arbitration path without clock or handshake signals |
| 2–9 (A1–A8) | Bidirectional port A I/O | Connects to local bus (e.g., MCU data bus); electrically isolated when OE = high |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance connection to system ground plane |
| 11–18 (B1–B8) | Bidirectional port B I/O | Connects to remote bus (e.g., peripheral module); mirrors A-side state when enabled and DIR-configured |
| 19 (OE) | Active-low output enable | High = all A/B pins in high-impedance state - enables bus sharing among multiple transceivers on same net |
| 20 (VCC) | Positive supply | 5-V nominal supply; requires local 0.1-µF ceramic bypass capacitor placed ≤2 mm from pin per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional data routing | Single DIR pin configures full-duplex A↔B communication path - eliminates need for separate transmit/receive buffers |
| 3-state output isolation | OE-controlled high-impedance mode prevents bus contention during multi-master arbitration or hot-swap events |
| Low input current | ≤1 µA max input leakage - reduces loading on upstream drivers and preserves signal integrity in fan-out-heavy topologies |
| Matched propagation delays | tpd(A→B) ≈ tpd(B→A) - ensures deterministic timing in time-critical control loops where direction reversal occurs mid-cycle |
| Center VCC/GND pin placement | VCC (pin 20) and GND (pin 10) positioned opposite each other - minimizes ground bounce and supply ripple in high-speed switching |
Applications
| Factory Automation I/O Expansion | Point-of-Sale Peripheral Interface |
|---|---|
Use Scenario: Connecting PLC CPU to distributed I/O modules via 1-meter ribbon cable in noisy industrial cabinets. IC Role / Device Role / Timing Role: Bidirectional bus repeater that restores signal amplitude and edge rate degraded by cable capacitance and EMI. Use Value: Enables reliable 10-MHz data transfer over 1 m of 28 AWG flat cable - verified in TI's Figure 9-2 simulation showing >3× voltage swing improvement vs. unbuffered MCU output. | Use Scenario: Interfacing thermal printer controller (MCU) with cash drawer, barcode scanner, and receipt printer over shared 5-V data bus. IC Role / Device Role / Timing Role: Isolating and buffering bidirectional command/data exchange between peripherals with mismatched drive strengths. Use Value: Prevents bus contention during concurrent access; ±6-mA drive ensures scanner ACK pulses meet 74LS input thresholds even after 30-cm trace routing. |
| Multi-Function Printer Engine Control | Telecom Line Card Backplane |
Use Scenario: Synchronizing print head motion control (FPGA) with paper feed motor driver (ASIC) across separate PCBs inside MFP chassis. IC Role / Device Role / Timing Role: Direction-controlled transceiver managing real-time status feedback and motion command streaming over internal flex cable. Use Value: 14-ns tpd allows sub-70-ns round-trip latency - critical for closed-loop stepper motor positioning accuracy within ±1 step error. | Use Scenario: Bridging FPGA-based packet processor to analog front-end (AFE) ASIC on telecom line card with 200-mm backplane traces. IC Role / Device Role / Timing Role: Signal integrity enhancer compensating for 50-pF trace capacitance and crosstalk-induced jitter. Use Value: Reduces bit-error rate (BER) by maintaining >800-mV noise margin at receiver inputs - validated against TI's CL = 150 pF switching data (tpd ≤ 34 ns). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245N | Same silicon die, identical electrical specs, RoHS-compliant NiPdAu lead finish (vs. SN74HCT245NE4's matte tin) | No functional difference; both rated –40°C to +85°C, PDIP-20 package, 20-tube packaging | Select SN74HCT245N for new designs requiring RoHS compliance; SN74HCT245NE4 remains viable for legacy rework or tin-only procurement requirements. |
| 74ACT245PC | Higher speed (tpd = 9 ns typ), wider VCC range (4.5–5.5 V), but higher ICC (40 mA max) and no guaranteed 85°C operation | Suitable for high-speed test equipment; not recommended for thermally constrained industrial enclosures | Choose 74ACT245PC only when tpd < 10 ns is mandatory and ambient temperature stays ≤70°C - otherwise SN74HCT245NE4 offers better thermal margin and lower static power. |
Compared with SN74HCT245N, SN74HCT245NE4 shares identical functionality but differs in lead finish and compliance marking; versus 74ACT245PC, it trades raw speed for guaranteed industrial temperature operation and 100× lower quiescent current - making it optimal for cost-sensitive, thermally demanding embedded control.
Availability
SN74HCT245NE4 is available at Aetrix Electronics and suitable for factory automation I/O expansion, point-of-sale peripheral interfacing, and multi-function printer engine control requiring stable component supply across extended product lifecycles.
Supply support for SN74HCT245NE4 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 over 50 years of industrial-grade component development.
The SN74HCT245NE4 belongs to TI's 74HCT logic family, engineered for robust 5-V TTL-compatible interfacing in industrial control, instrumentation, and legacy system upgrades where reliability and long-term availability are critical.
FAQ
What is the maximum operating temperature for SN74HCT245NE4?
The SN74HCT245NE4 is rated for operation from –40°C to +85°C. This industrial temperature range is validated per TI's SCLS020H datasheet revision H (December 2022) and applies specifically to the PDIP-N package variant. It supports deployment in factory automation cabinets and retail environments without derating.
Does SN74HCT245NE4 require external pull-up resistors on DIR or OE pins?
No, SN74HCT245NE4 does not require external pull-up resistors on DIR or OE. Its CMOS inputs draw ≤1 µA, so a direct connection to VCC or GND suffices. TI recommends tying unused inputs to valid logic levels - floating inputs may cause undefined states and increased ICC, as stated in SCBA004 application report.
Can SN74HCT245NE4 drive 15 LSTTL loads as specified in its datasheet?
Yes, SN74HCT245NE4 can drive up to 15 LSTTL loads per output, confirmed by TI's datasheet Section 1 (Features) and Section 6.5 (Electrical Characteristics). At VCC = 5 V and IO = ±6 mA, VOL ≤ 0.33 V and VOH ≥ 3.84 V - meeting LSTTL VIH/VIL thresholds with margin under worst-case conditions.
What is the propagation delay variation between A→B and B→A directions in SN74HCT245NE4?
SN74HCT245NE4 exhibits matched propagation delays: tpd(A→B) and tpd(B→A) are both 14 ns typical (VCC = 5.5 V, CL = 50 pF), with max 25 ns (VCC = 4.5 V). This symmetry is inherent to its balanced HCMOS design and documented in Table 6-6 of the SCLS020H datasheet - critical for deterministic timing in bidirectional protocols.
Is SN74HCT245NE4 pin-compatible with older SN74LS245 devices?
No, SN74HCT245NE4 is not pin-compatible with SN74LS245. While both are 20-pin PDIP octal transceivers with identical pin numbering (DIR, A1–A8, GND, B8–B1, OE, VCC), SN74LS245 uses bipolar TTL technology with different DC characteristics (e.g., higher ICC, asymmetric drive). Direct replacement requires validation of timing, loading, and power constraints per system-level testing.
SN74HCT245NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HCT245NE4 FAQ
1.How can I place an order for SN74HCT245NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245NE4 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 SN74HCT245NE4 reliable?
The price and inventory of SN74HCT245NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245NE4 is usually 5 days.
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4.How is shipping managed for SN74HCT245NE4?
SN74HCT245NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245NE4 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 SN74HCT245NE4?
For technical support, including SN74HCT245NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245NE4 requirements.
6.How does Aetrix verify that SN74HCT245NE4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT245NE4 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 SN74HCT245NE4 meets industry standards.
7.What is the process for return or replacement of SN74HCT245NE4?
All SN74HCT245NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245NE4, 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 SN74HCT245NE4 part is unused and in its original packaging.
Return procedure for SN74HCT245NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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