TLV803SDBZR - 2.93V Voltage Supervisor, SOT-23-3 | Texas Instruments
料号： TLV803SDBZR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.49 | $4.90 |
| 100 | $0.4 | $40.00 |
| 500 | $0.32 | $160.00 |
| 1,000 | $0.26 | $260.00 |
| 3,000 | $0.2 | $600.00 |
TLV803SDBZR 概述
A voltage supervisor (also called a reset IC or power-on reset generator) is a type of power management IC that monitors a system supply rail and generates a clean reset signal whenever the rail drops below a precise voltage threshold. Voltage supervisors sit within the broader hierarchy of supervisory circuits -> supervisors & reset ICs -> power management ICs -> semiconductor devices. They are essential building blocks for any microcontroller or DSP that requires deterministic startup behavior and brown-out protection, and they are distinguished from simple RC reset circuits by their tight threshold accuracy (typically ±1.5-2.5% over temperature) and defined reset pulse width.
Key features of the TLV803SDBZR include a 2.93V factory-trimmed threshold voltage, 200ms fixed propagation delay, low quiescent current of 9 µA (typical), open-drain active-low RESET output that requires an external pull-up resistor, and a wide operating temperature range of -40 °C to +125 °C. The 3-terminal SOT-23-3 footprint minimizes board space, making it ideal for space-constrained designs. An internal voltage reference and comparator architecture ensures stable threshold detection across temperature and process variations.
From a technical architecture standpoint, the TLV803SDBZR uses a precision bandgap reference combined with a comparator and timer block. The bandgap reference establishes the 2.93V trip point; the comparator continuously compares V_DD against this reference; when V_DD falls below V_IT-, RESET asserts and remains asserted until V_DD recovers above V_IT+ plus the 200ms timeout window. The open-drain output topology allows wired-OR connection with other reset sources and flexible interface to logic rails different from V_DD.
Typical applications for the TLV803SDBZR include microcontroller and DSP brown-out protection, FPGA configuration voltage monitoring, portable battery-powered equipment reset supervision, industrial control systems, and IoT edge nodes. In each case, the 2.93V threshold suits 3.3V system rails where a drop below tolerance must trigger a controlled processor reset.
When designing with this device, ensure the external pull-up resistor on the RESET pin is sized appropriately for the logic rail and capacitive load - too large slows the rising edge, too small wastes current. Place the device close to the IC it monitors to minimize trace inductance, and verify that decoupling at V_DD follows standard 0.1 µF ceramic placement guidelines.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical reset-circuit design notes not found in the manufacturer datasheet.
直接替换替代料： TLV803SDBZR ——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：
TLV803SDBZT
✅ 直接替换📋 参考替代料（不在目录中）
TLV803EA29DBZR
✅ 直接替换📋 参考替代料（不在目录中）
TLV803RDBZR
✅ 直接替换📋 参考替代料（不在目录中）
NCP803SN293T1G
✅ 直接替换📋 参考替代料（不在目录中）
MAX803MEXR+T
✅ 直接替换📋 参考替代料（不在目录中）
TLV803SDBZR 规格参数
| 功能 | Voltage supervisor (reset generator) |
| Number of Supervisors | 1 |
| Threshold Voltage (V_IT-) | 2.93 V |
| Reset Output Type | Active-Low, Open-Drain |
| Reset Timeout | 200 ms (typical) |
| Operating Supply Voltage (V_DD) | 1.1 V to 6.0 V |
| Quiescent Current (I_DD) | 9 µA (typical) |
| 工作温度范围 | -40 °C to +125 °C |
| 封装 | SOT-23-3 (DBZ) |
| 安装类型 | Surface Mount |
| 引脚数量 | 3 |
| RoHS 状态 | Compliant |
| Lead-Free / Halogen-Free | Yes (per TI product page) |
TLV803SDBZR 引脚配置
| 引脚 1 | GND — Ground reference |
| 引脚 2 | RESET — Active-low, open-drain reset output (requires external pull-up) |
| 引脚 3 | VDD — Supply voltage / monitored rail |
典型应用
TLV803SDBZR 适用于 6 应用s: Microcontroller Brown-Out Protection (3.3 V Rails), DSP Core Voltage Supervision, FPGA Configuration Voltage Monitoring, Portable / Battery-Powered Equipment Reset, Industrial Control Module Reset, IoT Edge Node Power Supervision.
Microcontroller Brown-Out Protection (3.3 V Rails)
The TLV803SDBZR's 2.93 V threshold and active-low open-drain RESET make it ideal for monitoring 3.3 V microcontroller supply rails where a drop below tolerance must trigger a controlled processor reset. The 200 ms timeout ensures V_DD and the MCU oscillator stabilize before code execution begins, preventing latch-up from unstable power. The 9 µA quiescent current is negligible versus typical MCU current budgets, making the part suited for always-on monitoring in mains-powered and battery-backed designs. Designers wire V_DD to the 3.3 V rail, GND to ground, and RESET through an external 10 kΩ pull-up to the MCU's logic rail.
推荐
DSP Core Voltage Supervision
DSP cores operating at sub-3 V rails benefit from the TLV803SDBZR's tight ±2.5% threshold accuracy and clean open-drain reset. When V_DD dips below 2.93 V due to a load transient or upstream converter fault, the supervisor immediately asserts RESET and holds it active for 200 ms after recovery, allowing PLL lock and core voltage stabilization. The SOT-23-3 package occupies minimal board area near the DSP, which is critical in space-constrained audio and motor-control modules. The wired-OR capability lets designers parallel multiple supervisors for multi-rail DSP power systems.
推荐
FPGA Configuration Voltage Monitoring
FPGAs require deterministic supply rail integrity during configuration; the TLV803SDBZR asserts RESET to inhibit configuration when 3.3 V drops below 2.93 V, preventing corrupted bitstream loading. The 200 ms delay after power restoration ensures the FPGA's internal POR sequence completes before the application logic begins. The open-drain RESET output allows direct connection to the FPGA's nCONFIG or nINIT pin. This pairing is common in industrial control modules and communications infrastructure where configuration errors are unacceptable.
推荐
Portable / Battery-Powered Equipment Reset
Battery-powered IoT nodes and portable instruments benefit from the TLV803SDBZR's 9 µA quiescent current, which adds negligible load to a Li-ion or 2xAA battery stack regulated to 3.3 V. The device monitors the post-regulator rail and signals the host MCU to enter safe shutdown if the battery droops below the brown-out threshold. The -40 °C to +125 °C operating range supports outdoor and automotive environments. The 1.1 V minimum V_DD also makes it usable as a secondary supervisor on 1.8 V or 2.5 V rails with adjusted pull-up.
推荐
Industrial Control Module Reset
Industrial PLCs, sensor hubs, and HMI panels rely on the TLV803SDBZR to guarantee MCU startup integrity after factory power glitches or brown-outs. The 200 ms reset pulse width matches typical MCU oscillator stabilization requirements, eliminating the need for software-based delay loops. The SOT-23-3 package and wide operating temperature range survive the thermal and vibration stress of factory-floor enclosures. Open-drain topology permits shared reset buses across multi-MCU modules, simplifying system architecture.
推荐
IoT Edge Node Power Supervision
IoT edge gateways and wireless sensor nodes use the TLV803SDBZR as a low-cost supervisor for the host MCU's 3.3 V rail, ensuring predictable boot behavior after sleep-mode wake-up or battery replacement. The 9 µA quiescent current is far below the node's radio current budget, so it does not degrade battery-life calculations. The active-low open-drain output supports wired-OR with the radio module's reset, enabling coordinated system reset. The SOT-23-3 footprint is compatible with high-density node PCBs.
推荐
推荐产品汇总
工程参考数据： TLV803SDBZR ——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 | TLV803SDBZT | TLV803EA29DBZR | TLV803RDBZR | NCP803SN293T1G | MAX803MEXR+T |
|---|---|---|---|---|---|---|
| Package | SOT-23-3 (DBZ) | SOT-23-3 (DBZ) - same | SOT-23-3 (DBZ) - same | SOT-23-3 (DBZ) - same | SOT-23-3 - same | SC-70-3 - pin-compatible SOT-23-3 footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | Analog Devices |
| Reset Output Type | Active-Low, Open-Drain | Active-Low, Open-Drain | Active-Low, Open-Drain | Active-Low, Open-Drain | Active-Low, Open-Drain | Active-Low, Open-Drain |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +125 °C |
关键差异点
- Standardized TI-supplied 2.93 V SOT-23-3 supervisor with broad distributor availability （对比 MAX803MEXR+T)
- Newer-generation TLV803E family consolidates legacy pinout variants （对比 TLV803SDBZR (this part) vs TLV803E family)
- Lower quiescent current than typical 3-pin supervisors （对比 NCP803SN293T1G)
设计说明
The TLV803SDBZR's RESET pin is open-drain and requires an external pull-up resistor (typically 10 kΩ to 100 kΩ) to the system's logic rail. Forgetting the pull-up leaves RESET floating, and the MCU may never receive a defined logic-high after power-up. Also verify the pull-up voltage does not exceed the absolute maximum of any RESET-pin ESD clamp - usually the MCU's I/O rail, which should be at or below V_DD + 0.3 V per the TI datasheet.
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the V_DD pin (pin 3) of the TLV803SDBZR. This bypasses high-frequency noise on the monitored rail that could cause spurious RESET assertions. For noisy industrial environments, add a 1 µF to 10 µF bulk capacitor in parallel. The 1.1 V minimum V_DD ensures the device starts operating below the 2.93 V threshold, which is critical for proper cold-boot behavior.
Keep the trace from V_DD to the supervisor short and direct - long traces pick up switching noise that may cause false reset events. The SOT-23-3 package should sit within 5-10 mm of the IC it monitors. Avoid routing noisy signals (switching converter SW nodes, motor phases) parallel to the V_DD trace to minimize coupled noise. The GND pin should connect to a low-impedance ground pour.
Do not use the TLV803SDBZR in circuits where the monitored rail can drop below 1.1 V for extended periods without disabling the device. Below 1.1 V the device behavior is undefined, and the open-drain RESET may leak or oscillate. For sub-1.1 V rails, choose a supervisor with a wider guaranteed minimum V_DD (e.g., TPS3839 family). Also confirm the 200 ms timeout matches the downstream MCU's oscillator stabilization requirement.
合规信息
RoHS and REACH compliant per TI TLV803 product page; lead-free and halogen-free per TI packaging specifications. Not AEC-Q100 qualified - for automotive designs consider TLV803-Q1 or qualified cross-brand equivalents.
