TPS3897ADRYR - Single-Channel Adj Supervisor | Texas Instruments
料号： TPS3897ADRYR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.78 | $0.78 |
| 10 | $0.69 | $6.90 |
| 100 | $0.55 | $55.00 |
| 500 | $0.43 | $215.00 |
| 1,000 | $0.36 | $360.00 |
TPS3897ADRYR 概述
A voltage supervisor (also called a voltage monitor or reset IC) is a power-management device that observes a system rail and asserts a reset signal whenever the rail falls outside a programmable window. Supervisors sit between the upstream DC-DC converter and the downstream microcontroller/SoC, forming a critical layer in the power-tree hierarchy: PSU -> DC-DC converter -> voltage supervisor -> MCU/SoC core and I/O rails. The TPS3897 specifically belongs to TI's TPS389x sub-family of programmable-threshold monitors, distinguishing it from fixed-threshold supervisors such as the TPS3808 or TPS3831 series.
Key features include an externally programmable threshold down to 500 mV, 1.0% maximum threshold accuracy over temperature, an adjustable reset delay set by an external capacitor on the CT pin, a logic enable input for output gating, and an ultra-low quiescent current of 1.5 uA typical. The device's small 6-pin USON footprint occupies less than 1.5 mm x 1.0 mm of board area, making it one of the smallest reset supervisors in TI's portfolio and ideal for space-constrained wearables and IoT nodes.
Internally, the TPS3897 combines a precision bandgap reference, a low-offset comparator, and a programmable delay timer, all trimmed for low current draw and stable operation across industrial temperature ranges. The active-high open-drain output can be wire-ORed with other reset sources and pulled up to any rail up to 6.5 V, simplifying multi-supply sequencing. The 1% accurate threshold ensures reliable boot-time decisions on processors with tight Vcore tolerances.
Typical applications include wearables, IoT sensor nodes, portable medical monitors, microcontroller reset supervisors, and battery-powered industrial endpoints. The same device also fits factory automation controllers and point-of-sale terminals that need a compact, accurate rail monitor.
When designing with this part, place the CT delay capacitor within 5 mm of the CT pin and keep the SENSE input trace short and away from switching noise. The open-drain RESET output requires an external pull-up resistor to a valid logic rail; do not leave it floating.
This page synthesizes verified distributor stock data, parametric drop-in alternatives in the same USON-6 footprint, and practical PCB/thermal/design notes that go beyond the manufacturer's datasheet, helping engineers select and source the TPS3897ADRYR with confidence.
直接替换替代料： TPS3897ADRYR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TPS3897ADRYT
✅ 直接替换📋 参考替代料（不在目录中）
TPS3897PDRYR
✅ 直接替换📋 参考替代料（不在目录中）
TPS3895ADRYR
✅ 直接替换📋 参考替代料（不在目录中）
TPS3896ADRYR
✅ 直接替换📋 参考替代料（不在目录中）
TPS3897ADRYR 规格参数
| Monitor Type | Single-channel adjustable voltage supervisor |
| 输出类型 | Active-high, open-drain |
| Number of Voltages Monitored | 1 |
| Supply Voltage Range (VDD) | 1.7 V to 6.5 V |
| Threshold Voltage Range | Greater than 500 mV (externally programmable) |
| Threshold Accuracy (typ) | 0.25% typical |
| Threshold Accuracy (max) | 1.0% over temperature |
| Quiescent Current (typ) | 1.5 uA |
| Reset Delay | Adjustable via external CT capacitor |
| 使能引脚 | Yes (logic EN to gate output) |
| 工作温度范围 | -40C to +125C |
| 封装 | 6-pin USON (DRY) 1.45 mm x 1.0 mm |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
| Output Drive (open-drain) | Wire-OR capable, pull-up to external rail |
| Datasheet Pages | 21 pages (per datasheet index) |
TPS3897ADRYR 引脚配置
| 引脚 1 | RESET — Active-high, open-drain reset output |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Logic enable input |
| 引脚 4 | CT — Programmable reset delay capacitor input |
| 引脚 5 | SENSE — Voltage sense input (threshold divider node) |
| 引脚 6 | VDD — Supply voltage input (1.7 V to 6.5 V) |
典型应用
TPS3897ADRYR 适用于 6 应用s: Wearable Device Power Rail Monitor, Industrial IoT Sensor Node, Portable Medical Monitor, Microcontroller Reset Circuit, Battery-Powered Industrial Endpoint, Point-of-Sale Terminal Power Monitor.
Wearable Device Power Rail Monitor
The TPS3897ADRYR's 1.5 uA typical quiescent current and 1.45 mm x 1.0 mm USON-6 footprint make it ideal as a reset supervisor for wearables such as smartwatches, fitness bands, and hearables. It monitors the 1.8 V or 3.3 V rail that powers the BLE SoC and asserts an active-high reset whenever the rail drifts below the externally programmed threshold, keeping the MCU in a safe state until the rail is stable. The 0.25% typical threshold accuracy prevents false resets under normal load transients, while 1.0% accuracy over -40C to +125C ensures reliable cold-boot behavior in outdoor fitness scenarios. This part is preferred over larger SOT-23 supervisors because the smaller land pattern reserves board space for the battery and antenna.
推荐
Industrial IoT Sensor Node
In battery-powered IIoT sensor nodes, the TPS3897ADRYR monitors the 3.3 V or 5 V system rail that powers an MCU and a low-power radio, holding the processor in reset until the rail is healthy. The 1.7 V to 6.5 V supply range lets it work directly from a single lithium cell or a 5 V industrial bus, removing the need for a separate bias rail and saving a few milliamps of quiescent drain. Its 500 mV minimum threshold allows tight monitoring of low-voltage MCUs, while the programmable CT delay lets designers match the supervisor to MCU power-on reset timing. Compared to a discrete comparator, it offers better temperature drift and a guaranteed 1.0% threshold tolerance under harsh industrial conditions.
推荐
Portable Medical Monitor
Medical wearables such as continuous glucose monitors, pulse oximeters, and ECG patches benefit from the TPS3897ADRYR's low Iq and small footprint. The device supervises a regulated rail feeding a low-power MCU and analog front-end, asserting a reset that prevents erroneous readings when battery voltage sags under load. The 0.25% typical threshold accuracy ensures the reset threshold tracks the rail's nominal value tightly, while 1.0% accuracy over -40C to +125C keeps behavior consistent across patient environments. Its small USON-6 package also allows it to fit inside disposable adhesive form factors where PCB area is at a premium.
推荐
Microcontroller Reset Circuit
As a discrete microcontroller reset supervisor, the TPS3897ADRYR watches the LDO output that powers the MCU core rail and signals a clean reset whenever the rail drifts outside the programmed window. The active-high open-drain output can be wire-ORed with a manual reset button or another supervisor, simplifying multi-source reset logic. Designers benefit from the 500 mV threshold floor for monitoring sub-1 V MCU rails and from CT-programmable delay for staggering releases in multi-rail systems. Compared to MCU-internal brown-out detectors, the TPS3897 provides a tighter 0.25% typical threshold and lower 1.5 uA quiescent current than most integrated options.
推荐
Battery-Powered Industrial Endpoint
In a battery-powered industrial endpoint such as a gas meter, water meter, or asset tracker, the TPS3897ADRYR holds the MCU in reset until the cell voltage and LDO output are stable. The wide 1.7 V to 6.5 V supply range supports a single 3.6 V lithium cell or a 5 V industrial bus, simplifying the power tree. With 1.5 uA typical quiescent current, it adds negligible idle drain, helping the endpoint achieve the 10+ year battery life target common in metering applications. The 6-pin USON (DRY) footprint is also suited to conformal-coated meter modules where small footprint is required for thermal and mechanical reasons.
推荐
Point-of-Sale Terminal Power Monitor
Point-of-sale terminals combine a small MCU, a secure element, and a printer or display, all powered from a regulated 3.3 V or 5 V rail. The TPS3897ADRYR monitors this rail and asserts a clean reset whenever the rail falls below the threshold, ensuring the secure element initializes correctly after a power glitch. The 0.25% typical threshold accuracy avoids false resets that could disrupt transactions, while the small USON-6 package keeps the BOM small for compact POS hardware. Compared to a fixed-voltage supervisor, the adjustable threshold supports multiple SKUs of the same POS platform with one common BOM.
推荐
推荐产品汇总
工程参考数据： TPS3897ADRYR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TPS3897ADRYT | TPS3897PDRYR | TPS3895ADRYR | TPS3896ADRYR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-pin USON (DRY) 1.45x1.0 mm | 6-pin USON (DRY) 1.45x1.0 mm - same | 6-pin USON (DRY) 1.45x1.0 mm - same | 6-pin USON (DRY) 1.45x1.0 mm - same | 6-pin USON (DRY) 1.45x1.0 mm - same |
| Number of Channels | 1 | 1 | 1 | Multiple (fixed-threshold monitor) | 1 |
| Output Type | Active-high, open-drain | Active-high, open-drain | Active-low, push-pull | Active-high, open-drain | Active-high, open-drain |
| Threshold Accuracy (typ) | 0.25% | 0.25% | 0.25% | 0.25% | 0.25% |
| Threshold Range | >500 mV adjustable | >500 mV adjustable | >500 mV adjustable | Fixed threshold options | Adjustable within TPS389x family |
| Quiescent Current (typ) | 1.5 uA | 1.5 uA | 1.5 uA | 1.5 uA | 1.5 uA |
| Supply Voltage Range | 1.7 V to 6.5 V | 1.7 V to 6.5 V | 1.7 V to 6.5 V | 1.7 V to 6.5 V | 1.7 V to 6.5 V |
| Reset Delay Adjustment | External CT capacitor | External CT capacitor | External CT capacitor | External CT capacitor | External CT capacitor |
关键差异点
- Adjustable threshold as low as 500 mV with 0.25% typical accuracy （对比 TPS3808G50QDBVRQ1)
- Smallest-in-class 6-pin USON (DRY) footprint （对比 TPS3106K33DBVR)
- Ultra-low 1.5 uA quiescent current （对比 General-purpose comparators with bandgap references)
设计说明
Place the TPS3897ADRYR as close as possible to the MCU's reset input. Route the SENSE trace directly to the rail capacitor or the LDO output pin, not to a via or star ground, to avoid IR-drop-induced false resets. Keep the CT capacitor within 3-5 mm of the CT pin, with both routed over a continuous ground plane.
The active-high, open-drain RESET output requires an external pull-up resistor to a valid logic rail up to 6.5 V. Choose a value between 10 kohm and 100 kohm to balance rise time and current draw. If RESET is left floating, the supervisor cannot communicate a fault condition to the MCU, defeating the purpose of the monitor.
Estimated: at VDD = 6.5 V and no load, the TPS3897ADRYR dissipates roughly (1.5 uA x 6.5 V) = 9.75 uW continuously. The 6-pin USON (DRY) package with a thermal pad has a theta_JA in the 200-300 C/W range, so even at 85C ambient the junction rise is well under 1 C, indicating the supervisor is thermally benign in all practical applications.
Do not omit the SENSE divider resistor network; an open SENSE pin causes the comparator to float and can produce intermittent resets. Ensure the CT capacitor has low leakage (X7R/C0G); a leaky electrolytic on CT will shorten the effective reset delay and produce unpredictable timing.
Where multiple TPS389x supervisors share an open-drain RESET bus, place a single pull-up at the far end of the bus rather than distributed pull-ups to avoid contention and slow edges. Decouple VDD with a 0.1 uF ceramic cap placed within 1 mm of the VDD pin for noise immunity during transient load events on the monitored rail.
合规信息
RoHS and REACH compliant per TI product page; lead-free and halogen-free packaging; AEC-Q100 qualification not applicable for standard DRY part - TI automotive-grade variants use a separate suffix if applicable.
