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Nexperia USA Inc. 74HC7540PWJ
- Part No.:
- 74HC7540PWJ
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC7540PWJ.pdf
- Description:
- IC BUFFER INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,507
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Product details
Overview
74HC7540PWJ from Nexperia is an octal inverting Schmitt-trigger buffer/line driver with 3-state outputs, dual active-low output enables (OE1, OE2), and CMOS-level inputs. It operates from 2.0 V to 6.0 V, delivers 7.8 mA sink/source drive at 4.5 V, and features input hysteresis (0.5 V typ. at VCC = 6.0 V) for noise-immune signal conditioning in industrial bus interfaces.
For engineers reviewing the 74HC7540PWJ datasheet, 74HC7540PWJ pinout, 74HC7540PWJ application, or 74HC7540PWJ equivalent, key selection criteria include its dual enable control logic, TSSOP20 package thermal performance, Schmitt-trigger threshold stability across -40 °C to +125 °C, and compatibility with legacy 74HC logic families requiring robust edge regeneration.
Technical Context
This device implements eight independent inverting buffer channels, each with Schmitt-trigger inputs that convert slow-rising/falling signals into clean digital transitions using defined VT+ (4.2 V typ.) and VT− (1.8 V typ.) thresholds at VCC = 6.0 V. Its dual OE inputs allow granular 3-state control of output groups - enabling flexible bus arbitration without external logic.
The architecture supports unlimited input rise/fall times and includes input clamp diodes for overvoltage tolerance up to ±20 mA, allowing direct interface to signals exceeding VCC when used with current-limiting resistors. Output drive strength is specified at ±7.8 mA (VCC = 4.5 V), with propagation delay as low as 11 ns (VCC = 6.0 V, CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables direct operation from 3.3 V and 5 V rails without level shifting. |
| Output Drive Strength | ±7.8 mA at VCC = 4.5 V - Sufficient to drive standard TTL loads and moderate PCB trace capacitance. |
| Propagation Delay | 11 ns max at VCC = 6.0 V, CL = 50 pF - Supports >20 MHz bus signaling with deterministic timing margins. |
| Schmitt Input Hysteresis | 0.5 V typical at VCC = 6.0 V - Rejects up to 500 mV of noise on slow analog-like control lines. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood industrial and extended-temperature embedded applications. |
| Input Clamp Current | ±20 mA - Permits safe interfacing to voltages beyond VCC using simple series resistors. |
| Power Dissipation Capacitance | 29 pF - Enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal design. |
Pinout & Package
TSSOP20 plastic thin shrink small outline package (SOT360-1), 20-pin, body width 4.4 mm, lead pitch 0.65 mm, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE1) | Active-low output enable 1 | Controls Y0–Y3 high-impedance state independently of OE2; enables partial bus isolation. |
| 2 (VCC) | Positive supply rail | Must be decoupled locally with 100 nF ceramic capacitor to suppress switching noise. |
| 3–10 (A0–A7) | Inverting data inputs | Accept CMOS-level signals; Schmitt-trigger inputs tolerate slow edges and reject noise. |
| 11–18 (Y0–Y7) | Inverting 3-state outputs | Drive complementary logic; enter high-Z when either OE1 or OE2 is HIGH. |
| 19 (OE2) | Active-low output enable 2 | Controls Y4–Y7 high-impedance state; dual-OE allows interleaved bus access control. |
| 20 (GND) | Circuit ground reference | Return path for all I/O and supply currents; requires low-inductance connection to plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output enables | OE1 controls Y0–Y3; OE2 controls Y4–Y7 - enables split-bus arbitration without external gating logic. |
| Schmitt-trigger input hysteresis | 0.5 V typical at VCC = 6.0 V - eliminates contact bounce and EMI-induced glitches on mechanical switch inputs. |
| Wide supply voltage range | 2.0 V to 6.0 V - interoperable across 2.5 V, 3.3 V, and 5 V systems without translators. |
| Input clamp diodes | Rated for ±20 mA clamping current - permits safe interface to 12 V control signals via 10 kΩ series resistor. |
| High noise immunity | CMOS input structure with 40% VCC hysteresis - rejects common-mode noise up to 1.2 V peak-to-peak at 5 V supply. |
Applications
| Industrial Bus Interface | Legacy System Upgrade |
|---|---|
Use Scenario: Isolating noisy sensor signals before digitization in PLC backplanes. IC Role / Device Role / Timing Role: Inverting Schmitt buffer regenerates degraded encoder quadrature signals and drives microcontroller GPIOs. Use Value: 0.5 V hysteresis rejects motor-drive EMI; 3-state outputs prevent bus contention during firmware updates. | Use Scenario: Replacing obsolete 74LS240 in aging test equipment control panels. IC Role / Device Role / Timing Role: Octal inverting line driver provides TTL-compatible output levels while consuming <1% the power. Use Value: CMOS inputs draw only 0.1 μA leakage; 7.8 mA drive matches LS-family fan-out requirements. |
| Motor Control Feedback | Programmable Logic Expansion |
Use Scenario: Conditioning hall-effect sensor outputs in brushless DC motor commutation circuits. IC Role / Device Role / Timing Role: Schmitt-trigger inputs convert slow analog sensor transitions into jitter-free digital edges for MCU timer capture. Use Value: Unlimited input rise/fall time support accommodates RC-filtered sensor outputs without added delay. | Use Scenario: Adding parallel I/O capability to FPGA-based logic analyzers with limited native pins. IC Role / Device Role / Timing Role: 3-state outputs allow dynamic multiplexing of multiple peripheral address/data buses onto shared traces. Use Value: Dual OE pins permit independent control of upper/lower nibbles - reducing FPGA pin count by 2 per device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT7540PW | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and 3-state behavior | Required when driving from 5 V TTL sources without level shifters | Select when interfacing legacy 74LS/74F logic families directly |
| SN74LVTH16244DGGR | 16-bit non-inverting, LVTH family, 3.3 V only, higher drive (24 mA), different pinout | Used in high-density 3.3 V memory/address buffering where inversion is not needed | Choose only if doubling channel count and 3.3 V operation are mandatory; not drop-in |
Compared with 74HCT7540PW, the 74HC7540PWJ offers superior noise immunity due to wider Schmitt hysteresis but lacks TTL input compatibility; versus SN74LVTH16244DGGR, it provides inversion and broader voltage range at lower drive strength and half the channel count.
Availability
74HC7540PWJ is available at Aetrix Electronics and suitable for industrial bus interface, motor control feedback, legacy system upgrade, and programmable logic expansion requiring stable component supply across extended temperature ranges.
Supply support for 74HC7540PWJ 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 74HC logic family targets cost-sensitive, wide-voltage industrial and embedded applications where CMOS-level compatibility, low static power, and robust noise immunity are essential.
FAQ
What is the maximum clock frequency supported by the 74HC7540PWJ?
The 74HC7540PWJ does not operate as a clocked device-it is a combinational buffer with no internal clock. Its usable signal bandwidth is determined by propagation delay (11 ns min at VCC = 6.0 V) and transition time (4 ns min), supporting clean edge transmission up to ~20 MHz for repetitive digital waveforms under 50 pF load conditions.
Can OE1 and OE2 be tied together for single-enable operation?
Yes-OE1 and OE2 may be connected to a common control signal. Doing so activates 3-state mode whenever the combined signal is HIGH, placing all eight outputs (Y0–Y7) into high-impedance simultaneously. This configuration simplifies control logic but forfeits independent group enable capability.
Does the 74HC7540PWJ require external pull-up resistors on outputs?
No-outputs are actively driven HIGH or LOW when enabled, and enter true high-impedance (not weak pull-up) when disabled. External pull-ups are unnecessary unless a specific bus protocol mandates a defined idle state; in such cases, they must be sized to avoid violating VOH/VOL specs under load.
How does the Schmitt-trigger input improve reliability in noisy environments?
The Schmitt-trigger input uses separate VT+ (4.2 V) and VT− (1.8 V) thresholds at VCC = 6.0 V, creating 0.5 V hysteresis. This prevents multiple output transitions when input signals cross the same threshold repeatedly due to noise, ensuring one clean edge per input monotonic transition-even with slow edges or superimposed interference.
74HC7540PWJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- Schmitt Trigger
- 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-TSSOP
74HC7540PWJ FAQ
1.How can I place an order for 74HC7540PWJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC7540PWJ 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 74HC7540PWJ reliable?
The price and inventory of 74HC7540PWJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7540PWJ is usually 5 days.
3.What payment methods are accepted for 74HC7540PWJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7540PWJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC7540PWJ?
74HC7540PWJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC7540PWJ 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 74HC7540PWJ?
For technical support, including 74HC7540PWJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7540PWJ requirements.
6.How does Aetrix verify that 74HC7540PWJ is sourced from the original manufacturer or authorized distributors?
All 74HC7540PWJ 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 74HC7540PWJ meets industry standards.
7.What is the process for return or replacement of 74HC7540PWJ?
All 74HC7540PWJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7540PWJ, 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 74HC7540PWJ part is unused and in its original packaging.
Return procedure for 74HC7540PWJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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