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onsemi 74HC245DTR2G
- Part No.:
- 74HC245DTR2G
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC245DTR2G.pdf
- Description:
- IC TXRX NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
74HC245DTR2G from onsemi is an octal 3-state noninverting bus transceiver in TSSOP-20 package, operating from 2.0 V to 6.0 V, with 15 LSTTL load drive capability, active-low Output Enable, and bidirectional data flow controlled by a Direction pin - used for asynchronous 2-way bus communication in industrial control backplanes and legacy interface bridging.
For engineers reviewing the 74HC245DTR2G datasheet, pinout, applications, or equivalent options, key selection criteria include voltage compatibility (2.0–6.0 V), propagation delay (13–110 ns depending on VCC and temperature), high-impedance isolation behavior, JEDEC Std. 7A compliance, and Pb-free TSSOP-20 packaging for space-constrained PCBs.
Technical Context
The 74HC245DTR2G implements a dual-bus, bidirectional transceiver architecture using high-performance silicon-gate CMOS. It features separate A and B 8-bit data ports, a single Direction control input that determines signal flow direction (A→B or B→A), and an active-low Output Enable (OE) that places both ports in high-impedance state when asserted.
Its logic-level compatibility spans standard CMOS outputs and LSTTL outputs (with pull-up resistors), and it meets JEDEC Standard No. 7A for high-noise immunity and latchup performance (≥300 mA at 85°C). ESD ratings are 2000 V HBM and 200 V machine model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V microcontroller to 5 V peripheral bus) |
| Propagation Delay (tPLH/tPHL) | 13 ns @ VCC = 6.0 V, TA = 25°C - enables reliable operation up to ~30 MHz bus toggle rates under light loads |
| Output Drive Strength | 15 LSTTL loads - sufficient to drive legacy TTL buses without external buffers |
| Input Leakage Current | ±0.1 µA max @ VCC = 6.0 V - minimizes standby power and prevents unintended logic transitions |
| Three-State Leakage | ±0.5 µA max @ VCC = 6.0 V - ensures robust bus isolation during high-Z mode |
| ESD Rating (HBM) | 2000 V - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
TSSOP-20 package (Case 948E), 6.5 mm × 4.4 mm footprint, 0.65 mm pitch, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Direction (DIR) | Active-high control: DIR = H enables A→B; DIR = L enables B→A |
| 10 | GND | Ground reference for all I/O and supply pins |
| 20 | VCC | Positive supply rail (2.0–6.0 V); decoupling capacitor required near pin |
| 11–18 | B1–B8 | Bi-directional data port B (I/O); electrically identical to A-port but physically separated |
| 2–9 | A1–A8 | Bi-directional data port A (I/O); matches LS245 pinout for drop-in replacement |
| 13 | Output Enable (OE) | Active-low: OE = L enables transceiver; OE = H forces all A/B pins to high-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Octal bidirectional data path | Enables full 8-bit parallel bus bridging between isolated subsystems without external direction logic |
| 3-state output control | Single OE pin disables both A and B ports simultaneously - simplifies bus arbitration in multi-master systems |
| LSTTL-compatible drive | 15 LSTTL load rating eliminates need for line drivers in legacy 5 V bus designs |
| Wide supply range (2.0–6.0 V) | Supports direct interfacing between 3.3 V controllers and 5 V peripherals without level shifters |
| JEDEC Std. 7A compliance | Guarantees noise margins ≥0.3×VCC across full temperature range - critical for noisy industrial environments |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Isolating and extending parallel address/data buses between PLC CPU modules and I/O expansion racks. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling synchronous read/write cycles across modular chassis backplanes. Use Value: 13 ns propagation delay at 6 V allows stable 30 MHz bus operation; 3-state control permits multiple transceivers on shared bus segments. |
Use Scenario: Connecting modern microcontrollers to legacy 8-bit peripheral interfaces (e.g., EPROM, parallel LCD, ISA-style peripherals). IC Role / Device Role / Timing Role: Voltage-level and timing-transparent bus bridge preserving original timing budgets. Use Value: Pinout compatibility with 74LS245 enables drop-in replacement; 2.0–6.0 V operation supports both 3.3 V MCU and 5 V peripheral rails. |
| Automotive Body Control Module | Test Equipment Signal Routing |
Use Scenario: Interfacing 3.3 V CAN controller MCUs with 5 V sensor interface ASICs in body electronics ECUs. IC Role / Device Role / Timing Role: Level-shifting transceiver managing bidirectional configuration and status register access. Use Value: –55°C to +125°C rating meets AEC-Q100 Grade 2 requirements; ±0.1 µA input leakage prevents battery drain in sleep modes. |
Use Scenario: Reconfigurable signal routing in automated test equipment (ATE) for DUT interface adaptation. IC Role / Device Role / Timing Role: Programmable bus switch enabling dynamic path selection between test instruments and device pins. Use Value: Single-cycle enable/disable via OE pin allows sub-20 ns bus reconfiguration; low 15 pF I/O capacitance preserves signal integrity at 50 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state noninverting bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245PWR | TSSOP-20, same logic function and DC specs; slightly higher max ICC (60 µA vs. 40 µA @ 6 V), identical AC timing | TI part uses different marking and tape/reel packaging; compatible in footprint and function but not identical in quiescent current | Select SN74HC245PWR only if TI supply chain alignment or alternate qualification is required; verify layout clearance for TI's TSSOP variant. |
| 74HCT245D,653 | Same pinout and package; TTL-compatible inputs (VIH = 2.0 V min), lower noise margin; 4.5–5.5 V optimized supply range | Designed for strict 5 V TTL-to-CMOS interfacing; unsuitable for 3.3 V-only systems due to input threshold mismatch | Choose 74HCT245D,653 only when interfacing with true 5 V TTL sources; avoid in mixed 3.3/5 V systems where 74HC245DTR2G's wider VCC range provides flexibility. |
Compared with SN74HC245PWR and 74HCT245D,653, the 74HC245DTR2G offers the broadest supply range (2.0–6.0 V), lowest quiescent current (4.0 µA), and highest noise immunity - making it optimal for low-power, multi-rail, and extended-temperature industrial designs where voltage flexibility and reliability are prioritized over TTL input compatibility.
Availability
74HC245DTR2G is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and automotive body control modules requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for 74HC245DTR2G 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 74HC245DTR2G belongs to onsemi's high-speed CMOS logic family, designed specifically for robust, low-power, pin-compatible upgrades of legacy TTL bus interface components in space- and reliability-critical systems.
FAQ
Is 74HC245DTR2G pin-compatible with the 74LS245?
Yes, the 74HC245DTR2G is explicitly designed to be pinout-identical to the 74LS245, including matching A/B port assignments, Direction, and Output Enable pin locations. This allows direct PCB replacement in legacy designs, provided voltage and timing constraints are verified - the 74HC245DTR2G operates from 2.0 V to 6.0 V versus the LS245's 4.75–5.25 V range.
What is the maximum clock/data toggle rate supported by 74HC245DTR2G?
The 74HC245DTR2G does not have a defined clock input, but its propagation delay (13 ns min @ 6.0 V) and transition time (10 ns min @ 6.0 V) support reliable bidirectional data toggling up to approximately 30 MHz under typical 50 pF load conditions. For higher-frequency operation, board layout, termination, and load capacitance must be carefully managed.
Does 74HC245DTR2G support partial power-down or I/O keep-alive functionality?
No, the 74HC245DTR2G lacks dedicated I/O power-down or keep-alive features. When VCC is removed or OE is asserted, all A and B pins enter high-impedance state - but no internal circuitry maintains logic state or prevents floating I/O. External pull-ups/downs are required if defined states are needed during disable or power-off.
Can 74HC245DTR2G safely interface a 3.3 V microcontroller with a 5 V EEPROM?
Yes - the 74HC245DTR2G's 2.0–6.0 V supply range and CMOS-compatible inputs allow safe bidirectional interfacing: configure VCC = 3.3 V for MCU-side signaling and rely on its 15 LSTTL load drive to source/sink sufficient current into the 5 V EEPROM's inputs (which tolerate 3.3 V logic HIGH per most 5 V EEPROM specs). Verify EEPROM VIH min before deployment.
What is the thermal resistance (θJA) of the 74HC245DTR2G in its TSSOP-20 package?
The 74HC245DTR2G in TSSOP-20 (Case 948E) has a junction-to-ambient thermal resistance (θJA) of 128°C/W under standard FR4 board conditions (10 mm × 1 inch, 20 oz copper, no airflow). This value assumes minimum pad spacing; improved PCB copper area or airflow can significantly reduce actual junction temperature in operation.
74HC245DTR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HC245DTR2G FAQ
1.How can I place an order for 74HC245DTR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC245DTR2G 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 74HC245DTR2G reliable?
The price and inventory of 74HC245DTR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245DTR2G is usually 5 days.
3.What payment methods are accepted for 74HC245DTR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245DTR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC245DTR2G?
74HC245DTR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC245DTR2G 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 74HC245DTR2G?
For technical support, including 74HC245DTR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245DTR2G requirements.
6.How does Aetrix verify that 74HC245DTR2G is sourced from the original manufacturer or authorized distributors?
All 74HC245DTR2G 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 74HC245DTR2G meets industry standards.
7.What is the process for return or replacement of 74HC245DTR2G?
All 74HC245DTR2G units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245DTR2G, 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 74HC245DTR2G part is unused and in its original packaging.
Return procedure for 74HC245DTR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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