Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | 8-bit SIPO shift + storage register |
| Supply | 2 V to 5.5 V |
| Timing | 7.1 ns maximum tpd at 5 V stated feature |
| Output | 3-state parallel outputs |
| Power Sequencing | Ioff supports live insertion / partial power-down / back-drive protection |
| Ports | Mixed-mode voltage operation supported |
| Clear | Direct shift-register clear |
| Exact Package / Packing | TSSOP (PW), 16 pins; active large tape and reel |
Product Overview
SN74LV595APWR retains the familiar 595 serial-to-parallel interface but adds modern partial-power-down behavior. Ioff prevents powered external signals from back-driving the device when VCC is off, which is useful in multi-rail or hot-plug systems.
The LV family operates to 5.5 V rather than the HC family’s 6 V ceiling and is optimized for modern lower-voltage logic. Mixed-mode port support and faster stated timing can make it a better fit for current embedded systems while preserving the 595 programming model.
PWR is the leaded TSSOP reel implementation; firmware can often preserve its shift/latch sequence while the electrical power-sequencing assumptions change from HC595.
For related devices, see HKEQGOO’s Shift Registers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | SN74LV595APWR |
| Function | 8-bit SIPO shift + storage register |
| Supply | 2 V to 5.5 V |
| Timing | 7.1 ns maximum tpd at 5 V stated feature |
| Output | 3-state parallel outputs |
| Power Sequencing | Ioff supports live insertion / partial power-down / back-drive protection |
| Ports | Mixed-mode voltage operation supported |
| Clear | Direct shift-register clear |
| Exact Package / Packing | TSSOP (PW), 16 pins; active large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | LV595A |
Functional Highlights
Ioff solves a system problem that classic HC595 does not target
When the host or loads remain powered during a local VCC-off state, back-drive current can cause phantom power or damage. LV595A explicitly supports partial-power-down protection.
Same “595” logic model does not mean identical electrical limits
Supply range, input thresholds, timing and power-off behavior differ from HC595, so a family migration should verify the real voltage domains even if firmware is unchanged.
Design Considerations
- Map every possible power sequence to ensure Ioff/logic limits are respected.
- Do not assume HC595 6 V operation is available; SN74LV595A is specified to 5.5 V.
- Keep OE/reset default states defined during hot insertion or rail sequencing.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists SN74LV595APWR as Active / Production; TSSOP (PW), 16 pins; large tape-and-reel; −40°C to +125°C family orderable range.
Related Engineering Resources
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Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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