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Nexperia USA Inc. 74HC245D,653
- Part No.:
- 74HC245D,653
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC245D,653.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,266
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Product details
Overview
74HC245D,653 from Nexperia is an octal 3-state bidirectional bus transceiver with CMOS-level inputs, direction control (DIR) and active-low output enable (OE), operating from 2.0 V to 6.0 V supply. It supports high-speed data transfer between buses in microcontroller systems, memory interfaces, and peripheral expansion circuits, with propagation delay as low as 7 ns at VCC = 6.0 V and CL = 15 pF.
For engineers reviewing the 74HC245D,653 datasheet, 74HC245D,653 pinout, 74HC245D,653 application, or 74HC245D,653 equivalent, this device is selected for level-shifting, bus isolation, and bidirectional data routing where low power, TTL-compatible timing margins, and robust ESD protection (HBM >2000 V) are required in industrial and embedded designs.
Technical Context
The 74HC245D,653 implements non-inverting bidirectional data flow controlled by DIR and OE signals: when OE is LOW, data passes either A→B (DIR = HIGH) or B→A (DIR = LOW); when OE is HIGH, all outputs enter high-impedance state. Its input clamp diodes allow safe interfacing to voltages exceeding VCC using external current-limiting resistors.
It operates across -40 °C to +125 °C, complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), and meets Class II Level B latch-up immunity (>100 mA). Static drive capability includes VOH ≥ 3.98 V (IO = −6.0 mA, VCC = 4.5 V) and VOL ≤ 0.26 V (IO = 6.0 mA, VCC = 4.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables interoperability with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 7 ns (VCC = 6.0 V, CL = 15 pF) - Supports 100+ MHz bus clocking in synchronous data transfers. |
| Output Drive Strength | ±6.0 mA (VCC = 4.5 V) - Sufficient to drive 10 LSTTL loads or 15 pF capacitive bus traces. |
| Input Thresholds (VIH/VIL) | VIH = 1.5 V min (VCC = 2.0 V); VIL = 0.5 V max - Ensures noise margin >0.4 V under worst-case conditions. |
| ESD Protection | HBM >2000 V, CDM >1000 V - Reduces need for external TVS on board-level I/O lines. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood automotive modules and industrial PLC backplanes. |
| Power Dissipation (Ptot) | 500 mW (SO20 package) - Allows sustained operation at full speed without forced cooling in compact enclosures. |
Pinout & Package
74HC245D,653 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 index located at top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Determines data flow direction: HIGH enables A→B; LOW enables B→A. |
| 2–9 (A0–A7) | Port A data I/O | Octal bidirectional bus interface terminal; connects to microcontroller or CPU data bus. |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers; must be low-impedance. |
| 11–18 (B0–B7) | Port B data I/O | Octal bidirectional bus interface terminal; connects to peripheral or memory bus. |
| 19 (OE) | Output enable (active LOW) | When HIGH, forces all A/B outputs into high-impedance state for bus sharing. |
| 20 (VCC) | Positive supply | Primary power rail; decoupling capacitor (100 nF) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2.0 V to 6.0 V - Eliminates need for separate voltage regulators in mixed-voltage systems. |
| CMOS low power dissipation | ICC ≤ 8.0 μA (typical, VCC = 6.0 V) - Enables battery-backed operation in standby modes. |
| Input clamp diodes | Integrated diodes on all inputs - Permits safe overvoltage tolerance up to VCC + 0.5 V with series resistor. |
| High noise immunity | VNIM ≥ 0.4 V (min) at VCC = 4.5 V - Resists EMI-induced glitches in noisy factory environments. |
| JEDEC-compliant packaging | SOT163-1 (SO20) - Compatible with standard reflow profiles and automated optical inspection (AOI). |
Applications
| Microcontroller Bus Expansion | Memory Interface Isolation |
|---|---|
Use Scenario: Adding parallel peripherals (e.g., LCD controllers, ADCs) to an MCU with limited GPIO count. IC Role / Device Role / Timing Role: Bidirectional data bridge between MCU data bus and peripheral bus, synchronized to address strobes. Use Value: Enables zero-wait-state communication at 20 MHz using DIR-controlled handshaking and OE-gated bus arbitration. |
Use Scenario: Isolating SRAM/ROM address/data lines from a processor during DMA cycles or reset sequences. IC Role / Device Role / Timing Role: 3-state buffer preventing bus contention during memory access conflicts or power sequencing. Use Value: Eliminates risk of data corruption during simultaneous read/write attempts by forcing high-Z on inactive port. |
| Industrial I/O Module Backplane | Legacy System Protocol Translation |
Use Scenario: Interfacing 5 V sensor nodes to a 3.3 V PLC controller via shared backplane bus. IC Role / Device Role / Timing Role: Voltage-level agnostic bidirectional transceiver supporting mixed-supply domain bridging. Use Value: Maintains signal integrity across 15 cm traces with <10 ns skew between A0–A7 and B0–B7 under 50 pF load. |
Use Scenario: Adapting legacy ISA-bus peripherals to modern FPGA-based host controllers. IC Role / Device Role / Timing Role: Direction-controlled bus repeater enabling protocol-specific handshake timing (e.g., IOWR/IORD assertion). Use Value: Matches ISA timing requirements (tPD ≤ 25 ns @ VCC = 5 V) while providing 3-state isolation during bus grant cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245D,653 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing. | Better interoperability with legacy 5 V TTL logic; slightly higher ICC at VCC = 5.5 V. | Select when interfacing with 74LS/74ALS families or where input threshold matching is critical. |
| SN74LVC245APWR | 3.3 V only (1.65–3.6 V); lower tpd (5.2 ns @ VCC = 3.3 V); different pinout (TSSOP20). | Optimized for low-voltage portable systems; not drop-in compatible due to voltage range and layout mismatch. | Choose for new 3.3 V designs requiring sub-6 ns latency and reduced power consumption. |
Compared with 74HCT245D,653, the 74HC245D,653 offers superior noise immunity and wider supply flexibility but requires level translation for pure TTL systems; versus SN74LVC245APWR, it trades speed and voltage efficiency for universal 2–6 V operation and legacy compatibility.
Availability
74HC245D,653 is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory interface isolation, and industrial I/O module backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC245D,653 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC245D,653 belongs to Nexperia's HC logic family, engineered for robustness in harsh environments and designed to deliver consistent timing, low static power, and interoperability across mixed-voltage digital systems.
FAQ
Can 74HC245D,653 operate reliably at 2.0 V supply?
Yes. The device is fully specified down to 2.0 V: VIH minimum is 1.5 V, VOL maximum is 0.26 V at IO = 6.0 mA, and tpd remains ≤90 ns. Input clamp diodes remain functional, and ICC stays below 80 μA across temperature, making it suitable for battery-powered 2.0 V systems with tight power budgets.
What is the maximum capacitive load the outputs can drive?
The outputs are characterized up to 50 pF (per Table 9 test conditions), with guaranteed tpd ≤27 ns at VCC = 4.5 V and CL = 50 pF. Driving >50 pF increases propagation delay nonlinearly and may cause ringing; for >75 pF loads, series termination or reduced slew rate (via external RC) is recommended per Figure 3 waveform guidelines.
Is pin 10 (GND) the only ground connection?
Yes. Pin 10 is the sole dedicated GND terminal. The exposed pad on QFN variants (e.g., BQ/BZ) is not electrically connected and must remain floating or tied to GND only if soldered - but the SO20 package (74HC245D,653) has no thermal pad, so pin 10 is the exclusive ground reference for all internal circuitry and output drivers.
How does DIR and OE interact during bus contention scenarios?
OE is prioritized: when OE = HIGH, all outputs go high-impedance regardless of DIR state, eliminating contention. When OE = LOW, DIR determines direction - but simultaneous A→B and B→A writes are prevented by design, as DIR is a static control signal sampled before data transfer. No internal arbitration logic exists; system-level handshaking must prevent conflicting DIR transitions during active data cycles.
74HC245D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74HC245D,653 FAQ
1.How can I place an order for 74HC245D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC245D,653 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 74HC245D,653 reliable?
The price and inventory of 74HC245D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245D,653 is usually 5 days.
3.What payment methods are accepted for 74HC245D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC245D,653?
74HC245D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC245D,653 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 74HC245D,653?
For technical support, including 74HC245D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245D,653 requirements.
6.How does Aetrix verify that 74HC245D,653 is sourced from the original manufacturer or authorized distributors?
All 74HC245D,653 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 74HC245D,653 meets industry standards.
7.What is the process for return or replacement of 74HC245D,653?
All 74HC245D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245D,653, 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 74HC245D,653 part is unused and in its original packaging.
Return procedure for 74HC245D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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