TPS7B6933DBVR - 150mA, 40V LDO Regulator, 3.3V Fixed | TI
MPN: TPS7B6933DBVR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 Overview
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.
Drop-in alternatives for TPS7B6933DBVR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS7B6933DBVR (same form factor and footprint) — differing in Package, MSL Level, Operating Temperature Range, Output Type, Dropout Voltage (Typical).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS7B6933QDBVRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7B6933DBVT
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7B6950DBVR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS70950DBVR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.39 / Unit
View Datasheet →TPS71825-12DRVT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.05 / Unit
View Datasheet →TLV431ACDBVR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.14 / Unit
View Datasheet →TPS7B6933DBVR Maximum Ratings & Electrical Characteristics
| Regulator Type | LDO, Positive Fixed |
| Output Type | Fixed 3.3 V |
| Input Voltage Range (Continuous) | 4 V to 40 V |
| Input Voltage Range (Transient) | Up to 45 V |
| Maximum Output Current | 150 mA |
| Dropout Voltage (Typical) | 450 mV at 150 mA |
| Quiescent Current (Typical, Light Load) | 15 µA |
| Quiescent Current (Maximum, Full Temp) | 25 µA |
| Operating Temperature Range | -40 °C to +105 °C |
| Package | SOT-23-5 (DBV) |
| Mounting Type | Surface Mount |
| Pin Count | 5 |
| Output Capacitor Requirement | ≥ 1 µF, ESR 0.25 Ω to 5 Ω |
| Protection Features | Short-Circuit Protection, Overcurrent Protection, Thermal Shutdown |
| MSL Level | Level 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| AEC-Q100 Qualification | Not Qualified (industrial grade; see TPS7B6933QDBVRQ1 for automotive) |
TPS7B6933DBVR Pin Configuration
| Pin 1 | IN — Input voltage (4 V to 40 V continuous, 45 V transient) |
| Pin 2 | GND — Ground reference |
| Pin 3 | EN — Enable input (active-high) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | OUT — Regulated 3.3 V output (up to 150 mA) |
Typical Applications
TPS7B6933DBVR is suitable for 7 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for TPS7B6933DBVR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Widest VIN window in 150-mA SOT-23-5 LDO class (vs TPS70950DBVR)
- AEC-Q100 qualification available in same package (vs TPS7B6933DBVR (industrial))
- Low-Iq integrated protection (vs TPS71825-12DRVT (dual LDO))
Design Notes
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.
Compliance Information
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.