# MC74VHC540DTR2G

**onsemi** · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

MC74VHC540DTR2G from onsemi, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OE1 | input | Active-low output enable 1, ANDed with OE2; when OE1 or OE2 is high the terminal outputs are forced to the high-impedance state. |
| 2 | A1 | input | Data input A1 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 3 | A2 | input | Data input A2 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 4 | A3 | input | Data input A3 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 5 | A4 | input | Data input A4 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 6 | A5 | input | Data input A5 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 7 | A6 | input | Data input A6 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 8 | A7 | input | Data input A7 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 9 | A8 | input | Data input A8 tolerates up to 7.0 V and must be held within GND to VCC for proper operation, with unused inputs tied to GND or VCC. |
| 10 | GND | power_in | Ground reference; Vin and Vout must be constrained to the range GND to VCC for proper operation. |
| 11 | Y8 | tri_state | Inverting three-state output Y8 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 12 | Y7 | tri_state | Inverting three-state output Y7 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 13 | Y6 | tri_state | Inverting three-state output Y6 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 14 | Y5 | tri_state | Inverting three-state output Y5 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 15 | Y4 | tri_state | Inverting three-state output Y4 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 16 | Y3 | tri_state | Inverting three-state output Y3 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 17 | Y2 | tri_state | Inverting three-state output Y2 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 18 | Y1 | tri_state | Inverting three-state output Y1 is high-impedance when either output enable is high, and unused outputs must be left open; rated ±25 mA per pin. |
| 19 | OE2 | input | Active-low output enable 2, ANDed with OE1; when OE1 or OE2 is high the terminal outputs are forced to the high-impedance state. |
| 20 | VCC | power_in | Positive supply; recommended operating range 2.0 V to 5.5 V, with absolute maximum 7.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TSSOP-20 |
| Category | Logic |
| Pins | 20 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| DC Supply Voltage | VCC | 2 |  | 5.5 | V |  | 2 |
| DC Input Voltage | Vin | 0 |  | 5.5 | V |  | 2 |
| DC Output Voltage | Vout | 0 |  |  | V | max printed as VCC | 2 |
| Operating Temperature, All Package Types | TA | -55 |  | 125 | °C |  | 2 |
| Input Rise and Fall Time | tr, tf | 0 |  | 100 | ns/V | VCC = 3.3 V ±0.3 V (Figure 1) | 2 |
| Input Rise and Fall Time | tr, tf | 0 |  | 20 | ns/V | VCC = 5.0 V ±0.5 V (Figure 1) | 2 |
| DC Supply Voltage | VCC | -0.5 |  | 7 | V |  | 2 |
| DC Input Voltage | Vin | -0.5 |  | 7 | V |  | 2 |
| DC Output Voltage | Vout | -0.5 |  |  | V | max printed as VCC + 0.5 | 2 |
| Input Diode Current | IIK | -20 |  |  | mA |  | 2 |
| Output Diode Current | IOK | -20 |  | 20 | mA |  | 2 |
| DC Output Current, per Pin | Iout | -25 |  | 25 | mA |  | 2 |
| DC Supply Current, VCC and GND Pins | ICC | -75 |  | 75 | mA |  | 2 |
| Power Dissipation in Still Air, TSSOP Package | PD |  |  | 450 | mW | TSSOP package, still air | 2 |
| Storage Temperature | Tstg | -65 |  | 150 | °C |  | 2 |
| Minimum High-Level Input Voltage | VIH | 1.5 |  |  | V | VCC = 2.0 V, TA = 25°C | 2 |
| Maximum Low-Level Input Voltage | VIL |  |  | 0.5 | V | VCC = 2.0 V, TA = 25°C | 2 |
| Minimum High-Level Output Voltage | VOH | 1.9 |  |  | V | Vin = VIH or VIL, IOH = -50 μA, VCC = 2.0 V, TA = 25°C | 2 |
| Minimum High-Level Output Voltage | VOH | 2.9 |  |  | V | Vin = VIH or VIL, IOH = -50 μA, VCC = 3.0 V, TA = 25°C | 2 |
| Minimum High-Level Output Voltage | VOH | 4.4 |  |  | V | Vin = VIH or VIL, IOH = -50 μA, VCC = 4.5 V, TA = 25°C | 2 |
| Minimum High-Level Output Voltage | VOH | 2.58 |  |  | V | Vin = VIH or VIL, IOH = -4 mA, VCC = 3.0 V, TA = 25°C | 2 |
| Minimum High-Level Output Voltage | VOH | 2.48 |  |  | V | Vin = VIH or VIL, IOH = -4 mA, VCC = 3.0 V, TA = -55 to 125°C | 2 |
| Minimum High-Level Output Voltage | VOH | 3.94 |  |  | V | Vin = VIH or VIL, IOH = -8 mA, VCC = 4.5 V, TA = 25°C | 2 |
| Minimum High-Level Output Voltage | VOH | 3.8 |  |  | V | Vin = VIH or VIL, IOH = -8 mA, VCC = 4.5 V, TA = -55 to 125°C | 2 |
| Maximum Low-Level Output Voltage | VOL |  |  | 0.1 | V | Vin = VIH or VIL, IOL = 50 μA, VCC = 2.0, 3.0, 4.5 V, TA = 25°C | 2 |
| Maximum Low-Level Output Voltage | VOL |  |  | 0.36 | V | Vin = VIH or VIL, IOL = 4 mA, VCC = 3.0 V, TA = 25°C | 2 |
| Maximum Low-Level Output Voltage | VOL |  |  | 0.44 | V | Vin = VIH or VIL, IOL = 4 mA, VCC = 3.0 V, TA = -55 to 125°C | 2 |
| Maximum Input Leakage Current | Iin | -0.1 |  | 0.1 | μA | Vin = 5.5 V or GND, VCC = 0 to 5.5 V, TA = 25°C | 3 |
| Maximum Input Leakage Current | Iin | -1 |  | 1 | μA | Vin = 5.5 V or GND, VCC = 0 to 5.5 V, TA = -55 to 125°C | 3 |
| Maximum Three-State Leakage Current | IOZ | -0.25 |  | 0.25 | μA | Vin = VIL or VIH, Vout = VCC or GND, VCC = 5.5 V, TA = 25°C | 3 |
| Maximum Three-State Leakage Current | IOZ | -2.5 |  | 2.5 | μA | Vin = VIL or VIH, Vout = VCC or GND, VCC = 5.5 V, TA = -55 to 125°C | 3 |
| Maximum Quiescent Supply Current | ICC |  |  | 4 | μA | Vin = VCC or GND, VCC = 5.5 V, TA = 25°C | 3 |
| Maximum Quiescent Supply Current | ICC |  |  | 40 | μA | Vin = VCC or GND, VCC = 5.5 V, TA = -55 to 125°C | 3 |
| Maximum Propagation Delay, A to Y | tPLH, tPHL | 1 |  | 8.5 | ns | VCC = 3.3 ±0.3 V, CL = 15 pF, TA = -55 to 125°C | 3 |
| Maximum Propagation Delay, A to Y | tPLH, tPHL | 1 |  | 12 | ns | VCC = 3.3 ±0.3 V, CL = 50 pF, TA = -55 to 125°C | 3 |
| Maximum Propagation Delay, A to Y | tPLH, tPHL | 1 |  | 6 | ns | VCC = 5.0 ±0.5 V, CL = 15 pF, TA = -55 to 125°C | 3 |
| Maximum Propagation Delay, A to Y | tPLH, tPHL | 1 |  | 8 | ns | VCC = 5.0 ±0.5 V, CL = 50 pF, TA = -55 to 125°C | 3 |
| Output Enable Time, OEn to Y | tPZL, tPZH | 1 |  | 12.5 | ns | VCC = 3.3 ±0.3 V, CL = 15 pF, RL = 1 kΩ, TA = -55 to 125°C | 3 |
| Output Enable Time, OEn to Y | tPZL, tPZH | 1 |  | 16 | ns | VCC = 3.3 ±0.3 V, CL = 50 pF, RL = 1 kΩ, TA = -55 to 125°C | 3 |
| Output Enable Time, OEn to Y | tPZL, tPZH | 1 |  | 8.5 | ns | VCC = 5.0 ±0.5 V, CL = 15 pF, RL = 1 kΩ, TA = -55 to 125°C | 3 |
| Output Enable Time, OEn to Y | tPZL, tPZH | 1 |  | 10.5 | ns | VCC = 5.0 ±0.5 V, CL = 50 pF, RL = 1 kΩ, TA = -55 to 125°C | 3 |
| Output Disable Time, OEn to Y | tPLZ, tPHZ | 1 |  | 17.5 | ns | VCC = 3.3 ±0.3 V, CL = 50 pF, RL = 1 kΩ, TA = -55 to 125°C | 3 |
| Output Disable Time, OEn to Y | tPLZ, tPHZ | 1 |  | 10 | ns | VCC = 5.0 ±0.5 V, CL = 50 pF, RL = 1 kΩ, TA = -55 to 125°C | 3 |
| Output to Output Skew | tOSLH, tOSHL |  |  | 1.5 | ns | VCC = 3.3 ±0.3 V, CL = 50 pF (Note 1) | 3 |
| Output to Output Skew | tOSLH, tOSHL |  |  | 1 | ns | VCC = 5.0 ±0.5 V, CL = 50 pF (Note 1) | 3 |
| Maximum Input Capacitance | Cin |  | 4 | 10 | pF | TA = 25°C | 3 |
| Maximum Three-State Output Capacitance (Output in High Impedance State) | Cout |  |  | 6 | pF | Output in high-impedance state | 3 |
| Quiet Output Maximum Dynamic VOL | VOLP |  | 0.9 | 1.2 | V | Input tr = tf = 3.0 ns, CL = 50 pF, VCC = 5.0 V, TA = 25°C | 3 |
| Quiet Output Minimum Dynamic VOL | VOLV |  | -0.9 | -1.2 | V | Input tr = tf = 3.0 ns, CL = 50 pF, VCC = 5.0 V, TA = 25°C | 3 |
| Minimum High Level Dynamic Input Voltage | VIHD | 3.5 |  |  | V | Input tr = tf = 3.0 ns, CL = 50 pF, VCC = 5.0 V, TA = 25°C | 3 |
| Maximum Low Level Dynamic Input Voltage | VILD |  |  | 1.5 | V | Input tr = tf = 3.0 ns, CL = 50 pF, VCC = 5.0 V, TA = 25°C | 3 |

## CAD (KiCad official)

- Symbol: `MC74VHC540DTR2G`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `mc74vhc540dtr2g-etched.step` / `mc74vhc540dtr2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc74vhc540dtr2g.step` / `mc74vhc540dtr2g.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/mc74vhc540dtr2-d.pdf) (8 pp, sha256 `658a08d2dba59491`, retrieved 2026-10-21, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/mc74vhc540dtr2g-datasheet.pdf)