TPS3897PDRYT

Texas Instruments TPS3897PDRYT — Precision Voltage Supervisor in 6‑pin WSON (DRY)

TPS3897PDRYT is a Texas Instruments precision voltage supervisor/reset IC in a 6‑pin WSON (DRY) package, supplied in tape‑and‑reel. It monitors supply rails and asserts reset to help ensure reliable system startup and brownout protection in MCU/MPU and digital systems.

Quick highlights

• Brand/manufacturer: Texas Instruments
• MPN: TPS3897PDRYT (family: TPS3897)
• Category: Voltage Supervisors / Reset ICs
• Function: Precision voltage supervisor (reset IC)
• Package: 6‑pin WSON/USON, TI package code DRY
• Mounting: Surface mount (SMT)
• Packaging: Tape & Reel (TR)
• Lifecycle status: Active
• Environmental: RoHS compliant (per manufacturer)

Overview

The Texas Instruments TPS3897PDRYT is a compact, precision voltage supervisor designed to improve system robustness by continuously monitoring a supply rail and driving a clean reset signal when the rail is out of tolerance. In microcontroller- and processor-based designs, brownout events and marginal power‑up sequences can corrupt memory, stall firmware, or leave peripherals in undefined states. A dedicated reset IC like the TPS3897PDRYT mitigates those risks with well‑defined threshold detection and deterministic reset timing, helping ensure a known‑good startup and graceful recovery from supply dips.

Housed in a 6‑pin WSON/USON (DRY) package, TPS3897PDRYT is ideal for dense layouts where board area is at a premium. The tape‑and‑reel format supports automated pick‑and‑place, and the device’s role as a single‑function, high‑reliability supervisor makes it a straightforward addition late in the design cycle or as a quality enhancement to existing platforms.

Key features and benefits

• Precision supervision of supply rails: Monitors a target rail and asserts reset when voltage falls below a defined threshold.
• Reliable system startup: Helps guarantee that firmware begins execution only when the supply is within specifications, reducing intermittent boot issues.
• Brownout protection: Detects undervoltage conditions during operation and generates a reset, minimizing the risk of data corruption or lockup.
• Compact 6‑pin WSON (DRY) package: Saves PCB real estate in space‑constrained systems such as wearables, IoT nodes, and portable instruments.
• Production‑friendly packaging: Supplied in tape‑and‑reel (TR) for high‑volume SMT assembly.
• Family flexibility: The TPS3897 family offers multiple threshold/timing variants; engineers can select the option that matches their rail voltage and sequencing needs. (See datasheet for orderable options.)

Technical specifications

Only verified specifications are listed below. For any item not explicitly specified here, consult the official datasheet.

• Manufacturer: Texas Instruments
• Family: TPS3897
• Function: Voltage supervisor / reset IC
• Architecture: Discrete supervisor
• Package: WSON/USON, 6 pins (TI code: DRY)
• Mounting: Surface Mount
• Packaging: Tape & Reel (TR)
• Category: Voltage Supervisors / Reset ICs

The following application‑critical parameters depend on the selected orderable variant and are not provided here:

• Monitored threshold voltage and accuracy: Not specified in datasheet (see orderable information in the TI datasheet).
• Reset output type (e.g., push‑pull or open‑drain): Not specified in datasheet.
• Reset polarity (e.g., active‑low or active‑high): Not specified in datasheet.
• Reset delay/release timing: Not specified in datasheet.
• Supply voltage (operating VCC) range: Not specified in datasheet.
• Hysteresis and glitch immunity: Not specified in datasheet.
• Quiescent current: Not specified in datasheet.
• Operating temperature range: Not specified in datasheet.
• Presence of manual reset input or watchdog: Not specified in datasheet.

Note: TPS3897PDRYT belongs to the TPS3897 family, which includes multiple threshold and timing options. Always confirm the specific “P” variant characteristics in the official datasheet and TI’s orderable part table before committing to production.

Package details and handling

• Package code: DRY
• Package type: WSON/USON, 6 pins
• Typical assembly method: Reflow soldering (SMT)
• Moisture Sensitivity Level (MSL): Not specified in datasheet
• Land pattern and exposed pad: Many WSON/USON packages include an exposed pad for thermal and electrical grounding; consult the datasheet’s mechanical section for the exact land pattern and whether the TPS3897 DRY package includes an exposed pad.

Part-numbering guidance

• TPS3897 P D RY T
• Family: TPS3897
• Variant code: P (exact functional/timing/threshold option must be verified in the datasheet)
• Package code: DRY (6‑pin WSON/USON)
• Suffix: T indicates Tape & Reel

Applications and use cases

• Microcontroller/processor reset: Ensures deterministic reset sequencing for MCUs, MPUs, SoCs, and FPGAs at power‑up and during voltage transients.
• Brownout protection: Detects undervoltage conditions on regulated rails and triggers reset to avoid undefined behavior.
• Battery‑powered and portable equipment: Guards against brownouts due to battery sag under load or during temperature extremes.
• Industrial control and automation: Improves system reliability in electrically noisy environments or where long cable runs cause droops.
• IoT and embedded systems: Ideal for compact nodes that require dependable startup and robust operation under variable power conditions.

Example end equipment:

• Smart meters, asset trackers, and gateways
• PLC I/O modules and sensor nodes
• Medical and test instruments (where a defined POR is critical)
• Consumer electronics and white goods control boards

Design‑in considerations

When integrating the Texas Instruments TPS3897PDRYT into a design, keep the following best practices in mind:

1) Select the correct threshold and timing option

• Align the supervisor threshold with your rail’s regulation window and the minimum safe operating voltage of your MCU/MPU and connected peripherals.
• Ensure the reset delay (release timing) accounts for the worst‑case power‑rail ramp time and any peripheral initialization that must occur before code execution.
• If your design requires a specific reset polarity or output topology (open‑drain vs push‑pull), choose the correct TPS3897 variant accordingly. These details are variant‑specific and must be confirmed in the datasheet.

2) Layout and decoupling

• Place the supervisor close to the rail it monitors to minimize sense lead resistance and noise pickup.
• Follow the datasheet’s recommended input bypassing for the VCC pin and any reference/sense pins.
• If the DRY package includes an exposed pad (see datasheet), connect it per TI’s recommendations—typically to ground—for thermal and electrical performance.

3) Reset signal integrity

• Route the reset line away from high‑dv/dt switching nodes and clocks. Avoid long stubs that may pick up noise.
• If multiple devices share the reset bus, verify electrical compatibility (wired‑OR with open‑drain outputs vs push‑pull drivers) and any need for pull‑up resistors.

4) System‑level sequencing

• If you supervise multiple rails, ensure downstream devices are held in reset until all rails are valid. This may require additional supervisors, power‑good signals from regulators, or simple logic gating.
• Validate behavior across cold‑start, warm‑start, and brownout scenarios, especially with batteries nearing end‑of‑life.

5) Verification and test

• Bench‑test reset behavior with controlled undervoltage sweeps and transient load steps.
• Confirm reset release timing across temperature and process extremes per your system’s requirements.

Lifecycle, compliance, and supply chain notes

• Lifecycle status: Active (per Texas Instruments product page; always re‑check current status before new designs)
• Environmental: RoHS compliant; TI lists “RoHS and Green” for the TPS3897 product line on its product page
• Packaging: Tape & Reel (TR), suitable for automated assembly

Compliance resources:

• Product page quality and environmental documents: https://www.ti.com/product/TPS3897#quality

Supply considerations:

• Verify orderable option TPS3897PDRYT aligns with your needed threshold and reset timing; the variant code determines these characteristics.
• Confirm package code (DRY) and reel orientation in your AVL/BOM to avoid line‑side confusion.
• For availability and lead time, consult authorized distributors. No pricing is displayed here; refer to distributor listings for current pricing and stock.

Replacements and alternates

• Direct replacements: None listed in the provided data.
• Approved alternates: None provided. If you must consider alternates, verify all of the following before substitution:
• Pinout compatibility and package footprint (WSON/USON 6‑pin dimensions and pad layout)
• Threshold voltage and accuracy, including hysteresis
• Reset polarity, output topology (open‑drain vs push‑pull), and reset release delay
• Operating voltage range, quiescent current, and temperature range
• Compliance (RoHS/Green) and lifecycle status

Policy note: Alternates should be verified for pinout, threshold options, timing, and package compatibility before substitution.

Procurement checklist

Use this quick checklist to streamline sourcing of Texas Instruments TPS3897PDRYT:

• Confirm the exact orderable code (TPS3897PDRYT) against the TI datasheet’s orderable table.
• Validate threshold option, reset polarity, output topology, and delay timing for the “P” variant.
• Ensure package code DRY (6‑pin WSON/USON) matches your PCB footprint.
• Verify Tape & Reel packaging (suffix T) for production.
• Review TI’s environmental and quality documentation (RoHS, “Green,” material content, MSL) on the product page.
• Check distributor inventory and lead times; consider adding a second source plan if your production ramps quickly.

Frequently asked questions (FAQs)

Q: What is TPS3897PDRYT used for?
A: It is a voltage supervisor/reset IC used to monitor supply rails and generate a reliable reset signal for MCUs/MPUs and digital systems during power‑up, brownout, or fault conditions.

Q: What package is TPS3897PDRYT supplied in?
A: A 6‑pin WSON/USON package with TI package code DRY, shipped in tape‑and‑reel (T/R).

Q: Is the TPS3897PDRYT RoHS compliant?
A: Yes. The TPS3897 family is listed as RoHS compliant (and “Green”) on Texas Instruments’ product page.

Q: What is the reset threshold voltage and delay time for the TPS3897PDRYT variant?
A: Not specified in datasheet here. Please refer to the official TPS3897 datasheet and the orderable part information for the exact threshold, accuracy, and delay associated with the “P” variant.

Q: Is the reset output active‑low or active‑high, and is it open‑drain or push‑pull?
A: Not specified in datasheet here. Consult the TPS3897 datasheet for the specific output topology and polarity of the “P” option.

Q: What is the operating voltage range and quiescent current?
A: Not specified in datasheet here. See the electrical characteristics in the datasheet for exact values.

Q: Are there recommended alternatives if TPS3897PDRYT is not available?
A: None are listed in the provided data. If you explore alternates, ensure pinout, package, thresholds, timing, and polarity all match your design needs.

Resources

• Product page: https://www.ti.com/product/TPS3897
• Datasheet: https://www.ti.com/lit/ds/symlink/tps3897.pdf
• Quality and environmental documents: https://www.ti.com/product/TPS3897#quality

This page focuses on the practical value of Texas Instruments TPS3897PDRYT for engineers and sourcing teams: a compact, precision supervisor in a 6‑pin WSON (DRY) package that simplifies reliable power‑on reset and brownout protection. For final selection and qualification, always verify the exact threshold, timing, polarity, and output topology for the specific orderable variant in the official TI datasheet.