Specifications
| Type | Description |
|---|---|
| Part Number | SN74HC540 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | 20-pin CDIP 26.92 mm x 6.92 mm; SOIC 12.80 mm x 7.50 mm; PDIP 25.40 mm x 6.35 mm; SO 15.00 mm x 5.30 mm; TSSOP 6.50 mm x 4.40 mm |
| Supply Voltage Range | 2 to 6 V |
| Supply Voltage Range | -0.5 to 7 V |
| Operating Free-Air Temperature | -55 to 125 °C |
| Operating Free-Air Temperature | -40 to 85 °C |
| High-Level Input Voltage | min 1.5 V |
| High-Level Input Voltage | min 3.15 V |
| High-Level Input Voltage | min 4.2 V |
| Low-Level Input Voltage | max 0.5 V |
| Low-Level Input Voltage | max 1.35 V |
| Low-Level Input Voltage | max 1.8 V |
| Input Voltage Range | 0 to VCC |
| Output Voltage Range | 0 to VCC |
| Input Transition Rise/Fall Time | max 1000 ns |
| Input Transition Rise/Fall Time | max 500 ns |
| Input Transition Rise/Fall Time | max 400 ns |
| Input Clamp Current | +/-20 mA |
| Output Clamp Current | +/-20 mA |
| Continuous Output Current | +/-35 mA |
| Continuous Current Through VCC or GND | +/-70 mA |
| Junction Temperature | 150 °C |
| Storage Temperature Range | -65 to 150 °C |
| Lead Temperature | 300 °C |
| High-Level Output Voltage | min 1.9 V, typ 1.998 V; SN54 min 1.9 V; SN74 min 1.9 V |
| High-Level Output Voltage | min 4.4 V, typ 4.499 V; SN54 min 4.4 V; SN74 min 4.4 V |
| High-Level Output Voltage | min 5.9 V, typ 5.999 V; SN54 min 5.9 V; SN74 min 5.9 V |
| High-Level Output Voltage | min 3.98 V, typ 4.3 V; SN54 min 3.7 V; SN74 min 3.84 V |
| High-Level Output Voltage | min 5.48 V, typ 5.8 V; SN54 min 5.2 V; SN74 min 5.34 V |
| Low-Level Output Voltage | typ 0.002 V, max 0.1 V; SN54 max 0.1 V; SN74 max 0.1 V |
| Low-Level Output Voltage | typ 0.001 V, max 0.1 V; SN54 max 0.1 V; SN74 max 0.1 V |
| Low-Level Output Voltage | typ 0.001 V, max 0.1 V; SN54 max 0.1 V; SN74 max 0.1 V |
| Low-Level Output Voltage | typ 0.17 V, max 0.26 V; SN54 max 0.4 V; SN74 max 0.33 V |
| Low-Level Output Voltage | typ 0.15 V, max 0.26 V; SN54 max 0.4 V; SN74 max 0.33 V |
| Input Current | typ +/-0.1 nA; SN54 max +/-100 nA; SN74 max +/-1000 nA |
| Off-State Output Current | typ +/-0.01 uA, max +/-0.5 uA; SN54 max +/-10 uA; SN74 max +/-5 uA |
| Supply Current | typ 8 uA; SN54 max 160 uA; SN74 max 80 uA |
| Input Capacitance | typ 3 pF, max 10 pF |
| Propagation Delay | typ 35 ns, max 100 ns; SN54 max 149 ns; SN74 max 125 ns |
| Propagation Delay | typ 10 ns, max 20 ns; SN54 max 30 ns; SN74 max 25 ns |
| Propagation Delay | typ 8 ns, max 17 ns; SN54 max 25 ns; SN74 max 21 ns |
| Output Enable Time | typ 75 ns, max 150 ns; SN54 max 224 ns; SN74 max 188 ns |
| Output Enable Time | typ 15 ns, max 30 ns; SN54 max 45 ns; SN74 max 38 ns |
| Output Enable Time | typ 13 ns, max 26 ns; SN54 max 38 ns; SN74 max 32 ns |
| Output Disable Time | typ 40 ns, max 150 ns; SN54 max 224 ns; SN74 max 188 ns |
| Output Disable Time | typ 18 ns, max 30 ns; SN54 max 45 ns; SN74 max 38 ns |
| Output Disable Time | typ 17 ns, max 26 ns; SN54 max 38 ns; SN74 max 32 ns |
| Output Transition Time | typ 28 ns, max 60 ns; SN54 max 90 ns; SN74 max 75 ns |
| Output Transition Time | typ 8 ns, max 12 ns; SN54 max 18 ns; SN74 max 15 ns |
| Output Transition Time | typ 6 ns, max 10 ns; SN54 max 15 ns; SN74 max 13 ns |
| Propagation Delay | typ 60 ns, max 150 ns; SN54 max 224 ns; SN74 max 188 ns |
| Propagation Delay | typ 15 ns, max 30 ns; SN54 max 45 ns; SN74 max 38 ns |
| Propagation Delay | typ 13 ns, max 26 ns; SN54 max 38 ns; SN74 max 32 ns |
| Output Enable Time | typ 100 ns, max 200 ns; SN54 max 298 ns; SN74 max 250 ns |
| Output Enable Time | typ 20 ns, max 40 ns; SN54 max 60 ns; SN74 max 50 ns |
| Output Enable Time | typ 17 ns, max 34 ns; SN54 max 51 ns; SN74 max 43 ns |
| Output Transition Time | typ 45 ns, max 210 ns; SN54 max 315 ns; SN74 max 265 ns |
| Output Transition Time | typ 17 ns, max 42 ns; SN54 max 63 ns; SN74 max 53 ns |
| Output Transition Time | typ 13 ns, max 36 ns; SN54 max 53 ns; SN74 max 45 ns |
| Power Dissipation Capacitance Per Buffer/Driver | typ 35 pF |
| Output Function | Inverting 3-state outputs |
| Output Disable Logic | High impedance when OE1=high or OE2=high |
| Function Table State | Y=H |
| Function Table State | Y=L |
| Function Table State | Y=Z |
| Function Table State | Y=Z |
| Bypass Capacitor Recommendation | 0.1 uF recommended; 0.1 uF and 1 uF commonly used in parallel |
| Unused Input Handling | Tie unused inputs to VCC or GND |
| Datasheet Status | request_only |
Product Overview
The recommended supply range for SN54HC540 and SN74HC540 operation is 2 to 6 V, with input and output voltage ranges from 0 to VCC. For SN74HC540, the recommended operating free-air temperature range is -40 to 85 °C. Logic thresholds are specified across 2 V, 4.5 V, and 6 V supplies, including VIH minimums of 1.5 V, 3.15 V, and 4.2 V and VIL maximums of 0.5 V, 1.35 V, and 1.8 V.
Key Features
- Octal inverting buffer line driver function
- Inverting 3-state outputs controlled by OE1 and OE2
- Recommended 2 to 6 V supply operation
- SN74HC540 free-air temperature range -40 to 85 °C
- Input and output voltage ranges from 0 to VCC
- High-impedance output when either output-enable input is high
- Typical 3 pF input capacitance over 2 to 6 V
- Typical 35 pF power dissipation capacitance per buffer/driver
- Unused inputs must be tied to VCC or GND
- 0.1 uF bypass capacitor recommended near VCC
Typical Applications
- Inverting signal buffering
- Line driver interfaces
- Shared bus output control
- High-impedance output gating
- Digital signal routing
- Buffered logic fanout
- Controlled A-to-Y inversion
Procurement Notes
When requesting a quote for SN74HC540, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What supply voltage range is specified for SN74HC540 operation?
The recommended supply voltage range for SN54HC540 and SN74HC540 operation is 2 to 6 V. The absolute maximum supply voltage range is specified separately as -0.5 to 7 V.
How are the SN74HC540 outputs enabled or disabled?
The outputs are inverting 3-state outputs. When OE1 and OE2 are both low, an A input is output at Y with inversion. If OE1 is high or OE2 is high, the Y output is high impedance.
What packages are listed for the SN74HC540?
The listed package options are 20-pin CDIP 26.92 mm x 6.92 mm, SOIC 12.80 mm x 7.50 mm, PDIP 25.40 mm x 6.35 mm, SO 15.00 mm x 5.30 mm, and TSSOP 6.50 mm x 4.40 mm.
How should unused inputs be handled on this device?
Unused inputs should be tied to VCC or GND. The datasheet fact states this is required to prevent floating inputs and undefined operational states.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 21, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.