TPS7B6933DBVR - 150mA, 40V LDO Regulator, 3.3V Fixed | TI
料号： TPS7B6933DBVR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.72 | $7.20 |
| 100 | $0.59 | $59.00 |
| 500 | $0.51 | $255.00 |
| 1,000 | $0.45 | $450.00 |
TPS7B6933DBVR 概述
A low-dropout (LDO) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage drops very close to the output voltage. The TPS7B6933DBVR belongs to the broader hierarchy of linear regulator -> voltage regulator -> power management IC -> semiconductor. The low-Iq advantage places it in the always-on regulator family used to bias standby microcontrollers and metrology sub-systems without draining batteries or violating standby power budgets.
Key features include the wide 4 V to 40 V continuous input window with 45 V transient survivability, a 450-mV dropout at 150 mA, an internal current limit with thermal shutdown, and only 15 µA typical Iq. The SOT-23-5 footprint and 5 µA-grade quiescent current make it suited to compact, thermally constrained boards that need to survive harsh automotive transients and industrial surge events.
The device uses a PNP-pass architecture followed by a precision bandgap reference and an error amplifier that drives the pass element to regulate VOUT. With 15 µA Iq at light loads, internal compensation is employed to reduce external parts; an output capacitor of at least 1 µF with ESR between 0.25 Ω and 5 Ω is required for stability per the manufacturer datasheet.
Typical applications include standby rails in e-meters, fire and smoke alarm sensors, automotive body-control modules, and industrial PLC logic supplies. The 40 V input window also makes it attractive as a post-switching-rail cleanup LDO for 24 V industrial buses.
When designing, ensure VIN - VOUT headroom and dissipation are budgeted. At 24 V input, 3.3 V output, and 100 mA load, the device dissipates about 2.07 W - a SOT-23-5 will require copper-pour heatsinking.
This page integrates verified distributor pricing, drop-in alternatives (same-package, parametrically validated), and practical PCB/thermal design notes not found in the standalone manufacturer datasheet.
直接替换替代料： TPS7B6933DBVR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TPS7B6933DBVR （相同外形与封装尺寸） ——差异在于 Package, MSL Level, Operating Temperature Range, Output Type, Dropout Voltage (Typical).
快速对比工具——选择替代料号进行并排对比：
TPS7B6933QDBVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
TPS7B6933DBVT
✅ 直接替换📋 参考替代料（不在目录中）
TPS7B6950DBVR
✅ 直接替换📋 参考替代料（不在目录中）
TPS70950DBVR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.39 / 个
查看数据手册 →TPS71825-12DRVT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.05 / 个
查看数据手册 →TLV431ACDBVR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.14 / 个
查看数据手册 →TPS7B6933DBVR 最大额定值与电气特性
| Regulator Type | LDO, Positive Fixed |
| 输出类型 | Fixed 3.3 V |
| Input Voltage Range (Continuous) | 4 V to 40 V |
| Input Voltage Range (Transient) | Up to 45 V |
| 最大输出电流 | 150 mA |
| Dropout Voltage (Typical) | 450 mV at 150 mA |
| Quiescent Current (Typical, Light Load) | 15 µA |
| Quiescent Current (Maximum, Full Temp) | 25 µA |
| 工作温度范围 | -40 °C to +105 °C |
| 封装 | SOT-23-5 (DBV) |
| 安装类型 | Surface Mount |
| 引脚数量 | 5 |
| Output Capacitor Requirement | ≥ 1 µF, ESR 0.25 Ω to 5 Ω |
| Protection Features | Short-Circuit Protection, Overcurrent Protection, Thermal Shutdown |
| MSL 等级 | Level 1 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| AEC-Q100 Qualification | Not Qualified (industrial grade; see TPS7B6933QDBVRQ1 for automotive) |
TPS7B6933DBVR 引脚配置
| 引脚 1 | IN — Input voltage (4 V to 40 V continuous, 45 V transient) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | EN — Enable input (active-high) |
| 引脚 4 | NC — Not connected (per datasheet) |
| 引脚 5 | OUT — Regulated 3.3 V output (up to 150 mA) |
典型应用
TPS7B6933DBVR 适用于 7 应用s: Standby Rail for E-Meter / Smart Meter, Always-On Smoke and Fire Detector Bias, Automotive Body and Cluster Standby, Industrial PLC Logic and Sensor Bias, IoT / Always-On Sensor Node, Post-Switching Ripple Cleanup LDO, Power Supply for 24 V Bus Distributed I/O.
Standby Rail for E-Meter / Smart Meter
TPS7B6933DBVR is a strong fit for e-meter standby rails: its 15 µA typical quiescent current drains almost nothing from the meter's battery-backed domain, while the 4 V to 40 V input window accepts 12 V or 24 V utility feeds and 36 V industrial transient spikes without pre-regulation. The 3.3 V fixed output biases the meter's low-power MCU and RTC directly. Recommended companion: a primary 24 V-to-3.3 V switching front end (when main load exists) and a TLV431ACDBVR as auxiliary supervisor reference for the same 3.3 V rail.
推荐
Always-On Smoke and Fire Detector Bias
Smoke and fire alarm sensors need a regulator that draws micro-amps until the alarm is triggered - TPS7B6933DBVR's 15 µA typical Iq extends battery life in ceiling-mounted smoke detectors well past 10 years. The 4 V to 40 V input tolerates rectified 9 V or 24 V system supplies, while the integrated short-circuit and thermal-shutdown protection prevents fire propagation if the output is shorted. Its SOT-23-5 footprint lets the regulator sit next to the MCU on a 25 mm disc PCB.
推荐
Automotive Body and Cluster Standby
Automotive body controllers and instrument clusters require a 3.3 V standby rail that survives load-dump events. TPS7B6933DBVR's 45 V transient survivability lets it sit directly on a 12 V or 24 V battery feed post-clamping; the 450-mV dropout keeps regulation at low cranking voltages. For designs that mandate AEC-Q100, swap to TPS7B6933QDBVRQ1 - same die, same footprint, automotive-qualified.
推荐
Industrial PLC Logic and Sensor Bias
Industrial 24 V PLC digital-input modules and 4-20 mA sensor transmitters need isolated or post-filtered 3.3 V rails. TPS7B6933DBVR offers a low-noise linear 3.3 V from the same 24 V bus, withstanding plant-side surges up to 45 V. Use it as the post-switching cleanup LDO to feed a digital isolator or MCU ADC reference. The 5-pin SOT-23-5 footprint allows placement on the input module's tight 25 mm board edge.
推荐
IoT / Always-On Sensor Node
Battery-powered IoT sensor nodes (smart agriculture, asset tracking, building automation) require months-to-years standby life. TPS7B6933DBVR's 15 µA quiescent current keeps sleep current budget negligible while the wide VIN window accepts solar-charged Li-ion or 6 V lead-acid banks directly. The 3.3 V output is ideal for direct bias of low-power Bluetooth or LoRa transceiver MCUs without an additional regulator stage.
推荐
Post-Switching Ripple Cleanup LDO
When a primary switching converter (e.g., TPS62177DQCT step-down) generates the 3.3 V main rail, TPS7B6933DBVR can be stacked downstream as a low-noise post-regulator for an analog or sensor subsystem that is sensitive to switching ripple. Although typically not as low-noise as a dedicated ultra-low-noise LDO (e.g., TPS7A4701), the TPS7B6933DBVR provides a low-Iq, 150 mA buffer that rejects high-frequency ripple from the upstream buck.
推荐
Power Supply for 24 V Bus Distributed I/O
Distributed I/O modules on a 24 V industrial bus often need a local 3.3 V rail for digital I/O logic that is tolerant to bus transients. TPS7B6933DBVR's 40 V continuous and 45 V transient window lets the part connect directly to the bus after a TVS clamp, eliminating an intermediate switching stage. Each distributed node keeps a small footprint SOT-23-5 LDO locally with sub-25 µA Iq overhead in standby.
推荐
推荐产品汇总
工程参考数据： TPS7B6933DBVR ——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 | TPS7B6933QDBVRQ1 | TPS7B6933DBVT | TPS7B6950DBVR | TPS70950DBVR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed | 5.0 V fixed | 5.0 V fixed |
| Input Voltage (Continuous) | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 2.7 V to 6.5 V |
| Maximum Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 50 mA |
| Quiescent Current (Typical) | 15 µA | 15 µA | 15 µA | 15 µA | 1 µA |
| Dropout Voltage (Typical) | 450 mV at 150 mA | 450 mV at 150 mA | 450 mV at 150 mA | 450 mV at 150 mA | 245 mV at 50 mA |
| AEC-Q100 Qualified | No | Yes | No | No | No |
关键差异点
- Widest VIN window in 150-mA SOT-23-5 LDO class （对比 TPS70950DBVR)
- AEC-Q100 qualification available in same package （对比 TPS7B6933DBVR (industrial))
- Low-Iq integrated protection （对比 TPS71825-12DRVT (dual LDO))
设计说明
Layout the input capacitor (≥ 0.1 µF X7R) within 5 mm of the IN pin and the output capacitor (≥ 1 µF X7R, ESR between 0.25 Ω and 5 Ω) within 5 mm of OUT. Ground both capacitors with short traces to the GND pin. The exposed thermal pad (DBV pin layout: tied to GND internally) should be soldered to the board copper pour to keep junction temperature down - even a small (100 mm²) 1 oz copper pour is required at the higher-input 24 V use case.
Estimated: at VIN = 24 V, VOUT = 3.3 V, IOUT = 100 mA, power dissipation is (24 - 3.3) × 0.1 = 2.07 W into a SOT-23-5 with θJA ≈ 200-250 °C/W on small copper. Junction rise would be 400-500 °C above ambient, which exceeds the +105 °C operating ceiling. Reduce to < 30 mA or provide a 600-1000 mm² copper pour; alternatively feed from a pre-regulated 5 V rail to drop worst-case dissipation to 170 mW.
Do not load the OUT capacitor with ESR outside 0.25 Ω to 5 Ω - low-ESR ceramic-only stacks may need a small series resistor or different dielectric per the TI TPS7B69 datasheet stability section. Do not leave EN floating; tie to IN via a 100 kΩ resistor if not actively driven. Avoid reversing IN and OUT during assembly - SOT-23-5 pin order is non-standard across vendor families.
For 24 V industrial-bus applications, place a TVS diode (e.g., SMAJ33CA or 36 V clamp) immediately at the IN pin to absorb transient surges - the device survives 45 V transient but its reliability margin drops at repetition rates above 100 Hz. Keep the TVS return trace short and direct to GND; do not share vias with the load return. This is recommended per common industrial EMC practice even though the TI datasheet does not mandate it.
合规信息
RoHS compliant per TI product page and listing on distributors dated 2026-10. Lead-free reflow profile per JEDEC J-STD-020. The standard TPS7B6933DBVR is industrial-grade (Q-temp); the automotive-qualified TPS7B6933QDBVRQ1 is AEC-Q100 Grade 1.