TPS7B8333QDCYRQ1 - 150mA, 40V Automotive LDO Regulator | Texas Instruments
料号： TPS7B8333QDCYRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.41 | $14.10 |
| 100 | $1.05 | $105.00 |
| 500 | $0.87 | $435.00 |
| 1,000 | $0.74 | $740.00 |
| 2,500 | $0.62 | $1,550.00 |
TPS7B8333QDCYRQ1 概述
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage approaches the output voltage. As part of the broader power management IC family, an LDO trades efficiency for simplicity and ultra-low noise, replacing a switching converter's external inductor and EMI with a compact, predictable analog control loop. The TPS7B83-Q1 specifically targets automotive rails where cold-crank (input voltage drops) and load-dump transients (input surges) coexist with microamp standby budgets.
Key differentiating features include a wide 3 V to 40 V operating input with 42 V transient survival for load-dump, a fixed 3.3 V output (also available in 5 V as TPS7B8350), an ultra-low 18 µA quiescent current for always-on power, and a fast transient response that minimizes output voltage excursion during load steps. The SOT-223 package also exposes a thermal pad to the PCB copper pour, enabling continuous 150-mA output in the -40 °C to +125 °C ambient range.
Architecturally, the regulator uses a PNP-Darlington pass element topology combined with an internal precision bandgap reference and a wide-bandwidth error amplifier. This delivers a low dropout voltage (~190 mV typical at 150 mA) and high ripple rejection across the audio band, with current-limit, thermal-shutdown, and reverse-battery protection integrated. The SOT-223 (DCY) package gives a junction-to-ambient thermal resistance around 55 °C/W on a JEDEC-standard 2-oz test board, allowing practical 150-mA operation without a discrete heatsink.
Typical applications include automotive body electronics (RKE, mirror modules, lighting), always-on microcontrollers and CAN transceivers powered directly from the 12 V battery rail, infotainment head-unit standby rails, and industrial sensors that must ride through load-dump pulses. The wide input range also makes it well suited for 24 V truck and bus systems with the same 150-mA output requirement.
When designing with this device, ensure the input capacitor is placed as close as possible to the IN pin and that the PCB copper area under the thermal tab is maximized; this tab is the primary heat-dissipation path. For always-on loads, the 18 µA quiescent current keeps drain below ~1 mA per day, which is critical for parked-vehicle battery life.
This page synthesizes distributor pricing, drop-in automotive-grade alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers evaluate the TPS7B8333QDCYRQ1 against modern 40-V LDO requirements.
直接替换替代料： TPS7B8333QDCYRQ1 ——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：
TPS7B8350QDCYRQ1
✅ 直接替换📋 参考替代料（不在目录中）
TPS7B8233QDCYRQ1
✅ 直接替换📋 参考替代料（不在目录中）
TPS7B8333QDCYRQ1
✅ 直接替换✓ 有现货
$0.62 / 个
查看数据手册 →TPS7B8850QDCYRQ1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS7B8333QDCYRQ1 最大额定值与电气特性
| 输出类型 | Fixed 3.3 V |
| 输出电压 | 3.3 V |
| 最大输出电流 | 150 mA |
| 输入电压范围 | 3 V to 40 V (42 V transient max) |
| Quiescent Current (Iq) | 18 µA (typical) |
| 工作温度范围 | -40 °C to +125 °C (ambient) |
| Junction Temperature Range | -40 °C to +150 °C |
| 封装 | SOT-223-4 (DCY) |
| 安装类型 | Surface Mount |
| AEC-Q100 Qualification | Qualified (automotive grade 1) |
| Lead-Free / RoHS | Yes / Compliant |
| Marking Code | 7B8333 |
TPS7B8333QDCYRQ1 引脚配置
| 引脚 1 | IN — Input supply voltage (3 V to 40 V, 42 V max transient) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | OUT — Regulated 3.3 V output, up to 150 mA |
| 引脚 4 | TAB/GND — Thermal tab (electrically tied to GND); primary heat dissipation path |
典型应用
TPS7B8333QDCYRQ1 适用于 6 应用s: Automotive Body Electronics (RKE, Lighting, Mirror Modules), Always-On Infotainment Standby Rail, Industrial 24 V Sensor / Field Transmitter, Automotive Camera / Vision Sensor Power, Truck / Heavy-Duty 24 V Battery Systems, Battery-Backed IoT / Smart Sensor Node.
Automotive Body Electronics (RKE, Lighting, Mirror Modules)
The TPS7B8333QDCYRQ1's 3 V to 40 V input range and AEC-Q100 grade-1 qualification make it a drop-in 3.3 V rail for body-electronics modules that must survive 12 V battery cold-crank (down to ~3 V) and load-dump (up to 42 V) without external TVS clamps. Its 18 µA quiescent current keeps always-on modules such as remote keyless entry receivers and ambient lighting controllers draining less than 1 mA per day from a parked vehicle's battery. Place the regulator close to the ECU's MCU or CAN transceiver and bypass IN with a 1 µF X7R cap to guarantee stable operation across cranking pulses.
推荐
Always-On Infotainment Standby Rail
Infotainment head units must keep a small logic block alive for key-presence detection and Bluetooth pairing while the vehicle is parked. The TPS7B8333QDCYRQ1's 18 µA Iq and 40 V input rating allow direct connection to the battery rail, replacing a discrete pre-regulator + LDO cascade. With 150 mA of headroom, the rail can supply the standby microcontroller plus a small RTC + CAN wake-up circuit. Use the SOT-223 thermal tab tied to at least 100 mm² of copper to sustain 150 mA continuously at 125 °C ambient.
推荐
Industrial 24 V Sensor / Field Transmitter
Industrial 24 V rails can swing from 18 V to 36 V under load, demanding a regulator with wide VIN tolerance. The TPS7B8333QDCYRQ1's 40 V absolute-max input (with 42 V transient capability) and fixed 3.3 V output let designers power microcontrollers and 4-20 mA loop sensors directly from a 24 V bus without a preregulator. Its 150 mA capability covers both the MCU and an isolated RS-485 or IO-Link transceiver. The SOT-223 footprint matches industry-standard industrial LDO land patterns, simplifying PCB reuse.
推荐
Automotive Camera / Vision Sensor Power
Forward-facing and surround-view cameras require low-noise 3.3 V rails for image-sensor serializers and ISPs. The TPS7B8333QDCYRQ1 connects directly to the 12 V battery and tolerates the engine-start cold-crank dip without dropping out, ensuring the serializer remains powered during cranking. Its fast transient response keeps output excursions small during serializer load steps, which is critical for clean MIPI CSI-2 data lanes. Place a 2.2 µF X7R input cap and a 1 µF X7R output cap within 2 mm of the package for stable regulation.
推荐
Truck / Heavy-Duty 24 V Battery Systems
Commercial trucks, buses, and agricultural vehicles use a 24 V nominal battery that can reach 36 V during regenerative charging events. The TPS7B8333QDCYRQ1's 40 V continuous rating plus 42 V transient tolerance covers this profile, and its AEC-Q100 qualification provides headroom for vibration and temperature stress. Use it to generate a clean 3.3 V rail for telematics and fleet-management modules, freeing them from the bulky DC-DC converters typically required in 24 V systems. The SOT-223 package is mechanically robust and easy to hand-rework in low-volume fleets.
推荐
Battery-Backed IoT / Smart Sensor Node
Solar- or battery-powered IoT nodes need a regulator that can accept a wide charging input while sipping microamps when the load sleeps. The TPS7B8333QDCYRQ1's 3 V to 40 V input range accepts a 6-cell NiMH pack or a small solar panel directly, while its 18 µA Iq keeps standby draw negligible. With 150 mA available, the same rail can power an MCU, sensor, and a sub-GHz or BLE radio. Pair it with an external P-channel MOSFET for load-disconnect to extend runtime on primary batteries.
推荐
推荐产品汇总
工程参考数据： TPS7B8333QDCYRQ1 ——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 | TPS7B8350QDCYRQ1 | TPS7B8233QDCYRQ1 | TPS7B8333QDCYRQ1 | TPS7B8850QDCYRQ1 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-223-4 (DCY) | SOT-223-4 (DCY) - same | SOT-223-4 (DCY) - same | SOT-223-4 (DCY) - same | SOT-223-4 (DCY) - same |
| Output Voltage | 3.3 V (fixed) | 5.0 V (fixed) | 3.3 V (fixed) | 3.3 V (fixed) | 5.0 V (fixed) |
| Input Voltage Range | 3 V to 40 V | 3 V to 40 V | 3 V to 40 V | 3 V to 40 V | 3 V to 40 V |
| Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 50 mA |
| Quiescent Current | 18 µA | 18 µA | 18 µA | 18 µA | 18 µA |
| AEC-Q100 Qualified | Yes (grade 1) | Yes (grade 1) | Yes (grade 1) | Yes (grade 1) | Yes (grade 1) |
| Thermal Tab | Yes (pin 4 = GND) | Yes (pin 4 = GND) | Yes (pin 4 = GND) | Yes (pin 4 = GND) | Yes (pin 4 = GND) |
关键差异点
- Ultra-low 18 µA quiescent current for always-on automotive rails （对比 Generic 40 V LDO competitors)
- AEC-Q100 grade 1 qualified (-40 °C to +125 °C ambient, +150 °C junction) （对比 Commercial-grade 40 V LDOs)
- Wide 3 V to 40 V continuous / 42 V transient input range without external TVS （对比 36 V-max competing LDOs)
- Pin-compatible drop-in to 5 V version (TPS7B8350QDCYRQ1) on same land pattern （对比 Single-output fixed regulators)
设计说明
Estimated: at VIN = 14 V (running engine), VOUT = 3.3 V, and 150 mA load, the TPS7B8333QDCYRQ1 dissipates approximately (14 - 3.3) × 0.150 = 1.6 W. With a typical RθJA of ~55 °C/W on a 2-oz JEDEC test board, this would cause ~88 °C of rise over ambient, requiring a copper-spread thermal pad of at least 100 mm² to maintain junction temperature below 125 °C in sealed enclosures.
Per the TI TPS7B83-Q1 datasheet, place a 1 µF X7R input bypass capacitor within 2 mm of the IN pin to handle load-dump and cold-crank transients, and a 1 µF to 2.2 µF X7R output capacitor within 2 mm of the OUT pin. The SOT-223 thermal tab (pin 4) must be soldered to a copper pour connected to GND; use at least eight thermal vias under the tab to drop thermal resistance and improve cold-crank survival.
Do not assume the TPS7B8333QDCYRQ1 will regulate below 3 V input; per TI's datasheet, the device requires VIN ≥ 3 V plus dropout margin to maintain a stable 3.3 V output. Cold-crank pulses that briefly drop below 3 V are tolerated because the output capacitor holds the rail up, but sustained operation below 3 V will cause the output to fall out of regulation.
Route the ground return for the load directly back to the regulator's GND pin (pin 2) rather than through the thermal tab to avoid sharing high currents with the thermal relief. Keep the input capacitor trace short - every 10 mm of trace inductance can resonate with ceramic capacitors at high VIN step rates, potentially causing input ringing during load-dump events.
合规信息
AEC-Q100 grade 1 qualified per TI TPS7B83-Q1 datasheet; lead-free and RoHS compliant per TI packaging cover sheet. Marking code 7B8333.
