Specifications
| Type | Description |
|---|---|
| Part Number | SN74HC245 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Component Type | Other |
| Package / Case | DB (SSOP-20) 7.20 mm x 5.30 mm; DW (SOIC-20) 12.80 mm x 7.50 mm; N (PDIP-20) 24.33 mm x 6.35 mm; NS (SO-20) 12.60 mm x 5.30 mm; PW (TSSOP-20) 6.50 mm x 4.40 mm |
| Function | Octal bus transceiver with 3-state outputs; asynchronous two-way communication between data buses |
| Operating Supply Voltage Range | 2 V to 6 V; recommended operating conditions, SN54HC245 and SN74HC245 |
| Nominal Supply Voltage | 5 V; recommended operating conditions |
| High-Level Input Voltage at VCC=2 V | min 1.5 V |
| High-Level Input Voltage at VCC=4.5 V | min 3.15 V |
| High-Level Input Voltage at VCC=6 V | min 4.2 V |
| Low-Level Input Voltage at VCC=2 V | max 0.5 V |
| Low-Level Input Voltage at VCC=4.5 V | max 1.35 V |
| Low-Level Input Voltage at VCC=6 V | max 1.8 V |
| Input Voltage Range | 0 V to VCC; recommended operating conditions |
| Output Voltage Range | 0 V to VCC; recommended operating conditions |
| Input Transition Rise and Fall Time at VCC=2 V | max 1000 ns |
| Input Transition Rise and Fall Time at VCC=4.5 V | max 500 ns |
| Input Transition Rise and Fall Time at VCC=6 V | max 400 ns |
| SN74HC245 Operating Free-Air Temperature | -40°C to 85°C |
| SN54HC245 Operating Free-Air Temperature | -55°C to 125°C |
| Supply Voltage Absolute Maximum | -0.5 V to 7 V; over operating free-air temperature range |
| Input Clamp Current Absolute Maximum | +/-20 mA; VI < 0 or VI > VCC |
| Output Clamp Current Absolute Maximum | +/-20 mA; VO < 0 or VO > VCC |
| Continuous Output Current Absolute Maximum | +/-35 mA; VO=0 to VCC |
| Continuous Current Through VCC or GND Absolute Maximum | +/-70 mA |
| Storage Temperature | -65°C to 150°C |
| Junction Temperature | 150°C |
| ESD Rating HBM | +/-3000 V; human body model, ANSI/ESDA/JEDEC JS-001 |
| ESD Rating CDM | +/-1000 V; charged-device model, JEDEC JESD22-C101 |
| High-Level Output Voltage at VCC=2 V, IOH=-20 uA | min 1.9 V, typ 1.998 V; VI=VIH or VIL, TA=25°C; min 1.9 V over temperature |
| High-Level Output Voltage at VCC=4.5 V, IOH=-20 uA | min 4.4 V, typ 4.499 V; VI=VIH or VIL, TA=25°C; min 4.4 V over temperature |
| High-Level Output Voltage at VCC=6 V, IOH=-20 uA | min 5.9 V, typ 5.999 V; VI=VIH or VIL, TA=25°C; min 5.9 V over temperature |
| High-Level Output Voltage at VCC=4.5 V, IOH=-6 mA | min 3.98 V, typ 4.3 V; SN54 min 3.7 V, SN74 min 3.84 V; VI=VIH or VIL |
| High-Level Output Voltage at VCC=6 V, IOH=-7.8 mA | min 5.48 V, typ 5.8 V; SN54 min 5.2 V, SN74 min 5.34 V; VI=VIH or VIL |
| Low-Level Output Voltage at VCC=2 V, IOL=20 uA | typ 0.002 V, max 0.1 V; VI=VIH or VIL |
| Low-Level Output Voltage at VCC=4.5 V, IOL=20 uA | typ 0.001 V, max 0.1 V; VI=VIH or VIL |
| Low-Level Output Voltage at VCC=6 V, IOL=20 uA | typ 0.001 V, max 0.1 V; VI=VIH or VIL |
| Low-Level Output Voltage at VCC=4.5 V, IOL=6 mA | typ 0.17 V; max 0.26 V at TA=25°C; SN54 max 0.4 V; SN74 max 0.33 V; VI=VIH or VIL |
| Low-Level Output Voltage at VCC=6 V, IOL=7.8 mA | typ 0.15 V; max 0.26 V at TA=25°C; SN54 max 0.4 V; SN74 max 0.33 V; VI=VIH or VIL |
| Input Current | typ +/-0.1 nA; SN54 max +/-1000 nA; SN74 max +/-1000 nA; DIR or OE, VCC=6 V, VI=VCC or 0 |
| Off-State Output Current | typ +/-0.01 uA; SN54 max +/-10 uA; SN74 max +/-5 uA; A or B high-impedance state, VCC=6 V, VO=VCC or 0 |
| Supply Current | typ 8 uA; SN54 max 160 uA; SN74 max 80 uA; VCC=6 V, VO=VCC or 0, IO=0 |
| Input Capacitance | typ 3 pF; max 10 pF; DIR or OE, input 2 V to 6 V |
| Propagation Delay, CL=50 pF, VCC=2 V | typ 40 ns; SN54 max 160 ns; SN74 max 130 ns; A or B to B or A |
| Propagation Delay, CL=50 pF, VCC=4.5 V | typ 15 ns; SN54 max 32 ns; SN74 max 26 ns; A or B to B or A |
| Propagation Delay, CL=50 pF, VCC=6 V | typ 12 ns; SN54 max 27 ns; SN74 max 22 ns; A or B to B or A |
| Output Enable Time, CL=50 pF, VCC=2 V | typ 125 ns; SN54 max 340 ns; SN74 max 290 ns; OE to A or B |
| Output Enable Time, CL=50 pF, VCC=4.5 V | typ 23 ns; SN54 max 68 ns; SN74 max 58 ns; OE to A or B |
| Output Enable Time, CL=50 pF, VCC=6 V | typ 20 ns; SN54 max 58 ns; SN74 max 49 ns; OE to A or B |
| Output Disable Time, CL=50 pF, VCC=2 V | typ 74 ns; SN54 max 300 ns; SN74 max 250 ns; OE to A or B |
| Output Disable Time, CL=50 pF, VCC=4.5 V | typ 25 ns; SN54 max 60 ns; SN74 max 50 ns; OE to A or B |
| Output Disable Time, CL=50 pF, VCC=6 V | typ 21 ns; SN54 max 51 ns; SN74 max 43 ns; OE to A or B |
| Output Transition Time, CL=50 pF, VCC=2 V | typ 20 ns; SN54 max 90 ns; SN74 max 75 ns; A or B output |
| Output Transition Time, CL=50 pF, VCC=4.5 V | typ 8 ns; SN54 max 18 ns; SN74 max 15 ns; A or B output |
| Output Transition Time, CL=50 pF, VCC=6 V | typ 6 ns; SN54 max 15 ns; SN74 max 13 ns; A or B output |
| Propagation Delay, CL=150 pF, VCC=2 V | typ 54 ns; SN54 max 200 ns; SN74 max 170 ns; A or B to B or A |
| Propagation Delay, CL=150 pF, VCC=4.5 V | typ 18 ns; SN54 max 40 ns; SN74 max 34 ns; A or B to B or A |
| Propagation Delay, CL=150 pF, VCC=6 V | typ 15 ns; SN54 max 34 ns; SN74 max 29 ns; A or B to B or A |
| Output Enable Time, CL=150 pF, VCC=2 V | typ 150 ns; SN54 max 405 ns; SN74 max 335 ns; OE to A or B |
| Output Enable Time, CL=150 pF, VCC=4.5 V | typ 31 ns; SN54 max 81 ns; SN74 max 67 ns; OE to A or B |
| Output Enable Time, CL=150 pF, VCC=6 V | typ 25 ns; SN54 max 69 ns; SN74 max 56 ns; OE to A or B |
| Output Transition Time, CL=150 pF, VCC=2 V | typ 45 ns; SN54 max 315 ns; SN74 max 265 ns; A or B output |
| Output Transition Time, CL=150 pF, VCC=4.5 V | typ 17 ns; SN54 max 63 ns; SN74 max 53 ns; A or B output |
| Output Transition Time, CL=150 pF, VCC=6 V | typ 13 ns; SN54 max 53 ns; SN74 max 45 ns; A or B output |
| Power Dissipation Capacitance Per Transceiver | typ 40 pF; no load, TA=25°C |
| Output Drive Current | +/-6 mA at 5 V |
| Load Drive Capability | Up to 15 LSTTL loads; 3-state outputs drive bus lines directly |
| Direction Control Behavior | DIR selects A bus to B bus or B bus to A bus transmission |
| Output Enable Behavior | OE disables device so buses are effectively isolated |
| Pin Count | 20 pins; DB, DGV, DW, N, J, W, PW and FK packages shown |
| DIR Pin | Pin 1 |
| OE Pin | Pin 19 |
| Supply Pin | VCC pin 20 |
| Ground Pin | GND pin 10 |
| Datasheet Source | Manufacturer technical datasheet |
| Datasheet Status | request_only |
Product Overview
SN74HC245 is a Texas Instruments octal bus transceiver in the Signal_Chain category. The device provides 3-state outputs for asynchronous two-way communication between data buses. Direction control is handled by the DIR input: one logic state selects A bus to B bus transmission, and the opposite state selects B bus to A bus transmission. The OE input disables the device so the buses are effectively isolated.
Key Features
- Octal bus transceiver with 3-state outputs
- Supports asynchronous two-way data bus communication
- Operates from 2 V to 6 V supply
- DIR selects A-to-B or B-to-A transmission
- OE disables outputs for bus isolation
- Outputs drive up to 15 LSTTL loads
- +/-6 mA output drive current at 5 V
- 20-pin package options include SSOP, SOIC, PDIP, SO, TSSOP
- SN74HC245 operates from -40°C to 85°C
- HBM ESD rating is +/-3000 V
Typical Applications
- Asynchronous two-way data bus communication
- Direct bus-line drive
- A-to-B bus transmission
- B-to-A bus transmission
- Bus isolation using OE
- LSTTL load interfacing
- 20-pin logic board assemblies
Procurement Notes
When requesting a quote for SN74HC245, 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 function does the SN74HC245 provide?
The SN74HC245 is an octal bus transceiver with 3-state outputs. It supports asynchronous two-way communication between data buses, with DIR selecting the transmission direction and OE disabling the device to isolate the buses.
What supply voltage range is specified for SN74HC245?
The recommended operating supply voltage range for SN74HC245 and SN54HC245 is 2 V to 6 V, with 5 V listed as the nominal supply voltage under recommended operating conditions.
Which package options are listed for this device?
The listed package cases include DB SSOP-20, DW SOIC-20, N PDIP-20, NS SO-20, and PW TSSOP-20. The extracted pin information identifies the device as a 20-pin part.
How are direction and output enable controlled?
The DIR input on pin 1 selects whether data is transmitted from the A bus to the B bus or from the B bus to the A bus. The OE input on pin 19 disables the device so the buses are effectively isolated.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 13, 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.