TPS7B6950QDCYRQ1 - 5V 150mA 40V Ultra-Low IQ LDO | TI
MPN: TPS7B6950QDCYRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.18 | $11.80 |
| 100 | $0.94 | $94.00 |
| 500 | $0.78 | $390.00 |
| 1,000 | $0.69 | $690.00 |
TPS7B6950QDCYRQ1 Overview
An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only slightly higher than the desired output. LDOs are a subset of linear regulators, which in turn belong to the broader power management IC family used in nearly every electronic system. Compared to switching regulators, LDOs introduce no switching noise and require only small input/output capacitors, but dissipate the voltage difference as waste heat. The TPS7B6950QDCYRQ1 targets always-on automotive subsystems where low standby current and wide input tolerance are mandatory.
Key features include 15 uA typical quiescent current at light loads, integrated short-circuit and overcurrent protection, thermal shutdown, and a wide -40 C to +125 C operating junction temperature range. The SOT-223 (DCY) package exposes the tab as a thermal pad, allowing sustained 150 mA output without an external heatsink at moderate VIN-VOUT conditions. The device is part of TI's TPS7B69xx-Q1 family that also offers 2.5 V (TPS7B6925-Q1) and 3.3 V (TPS7B6933-Q1) fixed-output siblings.
The architecture uses a PNP pass transistor topology that delivers low dropout and inherently low quiescent current. An internal bandgap reference sets the 5.0 V rail accuracy to within +/-2% across line, load, and temperature. Internal protective circuitry monitors junction temperature and output current, latching off the device in fault conditions to prevent module damage.
Typical applications include automotive body electronics, remote keyless entry receivers, body control modules, instrument clusters, and standby rails for ECUs that must remain alive while the vehicle is parked. The 40 V input rating tolerates load-dump transients on the 12 V automotive bus, simplifying TVS design.
When designing with this device, place the input and output capacitors as close as possible to the IC pins to minimize ESL/ESR. For high VIN-VOUT conditions at 150 mA, verify junction temperature rise using the package thermal resistance, since power dissipation equals (VIN - VOUT) x IOUT.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for TPS7B6950QDCYRQ1 — 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 TPS7B6950QDCYRQ1 (same form factor and footprint) — differing in Output Type, Output Voltage, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS7B6933QDCYRQ1
✅ Drop-In✓ In Stock
$0.41 / Unit
View Datasheet →TPS7B6925QDCYRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7B6950QDCYR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7B6950QDCYRQ1G4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7B6950QDCYRQ1 Maximum Ratings & Electrical Characteristics
| Output Type | Fixed (5.0 V) |
| Output Voltage | 5.0 V |
| Output Voltage Accuracy | +/-2% (typical) |
| Input Voltage Range | 4 V to 40 V |
| Maximum Output Current | 150 mA |
| Quiescent Current (light load) | 15 uA (typical) |
| Operating Junction Temperature | -40 C to +125 C |
| Package | SOT-223-4 (DCY) |
| Mounting Type | Surface Mount |
| Protection Features | Thermal shutdown, short-circuit, overcurrent |
| AEC-Q100 Qualification | Qualified (automotive grade) |
| RoHS Status | Compliant |
TPS7B6950QDCYRQ1 Pin Configuration
| Pin 1 | IN — Input voltage (4 V to 40 V) |
| Pin 2 | GND — Ground |
| Pin 3 | OUT — Regulated 5.0 V output |
| Pin 4 | TAB — Exposed thermal tab (electrically tied to GND; primary thermal dissipation path) |
Typical Applications
TPS7B6950QDCYRQ1 is suitable for 6 applications: Automotive Body Control Modules, Remote Keyless Entry Receivers, Automotive Instrument Cluster Standby Rails, Industrial 24 V Bus Sensor Power, Automotive ECU Wake-Up Circuits, Battery-Backed Always-On Memory Power.
Automotive Body Control Modules
The TPS7B6950QDCYRQ1 supplies 5.0 V rails for automotive body control modules (BCMs) that operate continuously while the vehicle is parked. Its 4 V to 40 V input tolerates cranking transients (down to ~6 V) and load-dump surges up to 35 V on the 12 V bus. The 15 uA quiescent current drains only ~1.3 mAh per day from a 90 Ah battery, making it ideal for always-on standby. The AEC-Q100 qualification plus -40 C to +125 C junction temperature rating support under-hood deployment. The 5 V output directly powers legacy 5 V CAN transceivers and remote keyless entry receivers without an additional DC-DC stage.
Recommended
Remote Keyless Entry Receivers
The TPS7B6950QDCYRQ1 is well-suited for remote keyless entry (RKE) receivers that must remain awake 24/7 to detect low-frequency (125 kHz) wake-up signals from a key fob. With 15 uA quiescent current and no enable pin, the LDO draws negligible battery current during vehicle parking, preserving battery life over the typical 4-6 week parking interval. The 5.0 V output powers the LF receiver front-end and a small wake-up MCU. The 40 V input withstands jump-start transients from another vehicle (up to ~24 V) without damage. AEC-Q100 qualification ensures reliability in the wide temperature swings of an automotive cabin.
Recommended
Automotive Instrument Cluster Standby Rails
The TPS7B6950QDCYRQ1 powers the always-on portion of instrument cluster electronics - clock, RAM retention, and wake-up logic - while the vehicle ignition is off. Its 150 mA output handles small standby loads, while the SOT-223 package tab dissipates the (12 V - 5 V) x 0.15 A = 1.05 W load without an additional heatsink. The wide 40 V input allows the same PCB design to serve both 12 V passenger vehicles and 24 V commercial trucks without redesign. AEC-Q100 grade-1 qualification ensures operation across -40 C to +125 C ambient, including under-dash temperatures during summer. The integrated thermal shutdown and short-circuit protection guard the cluster against harness faults.
Recommended
Industrial 24 V Bus Sensor Power
Beyond automotive, the TPS7B6950QDCYRQ1 fits industrial 24 V bus sensor applications where a wide input range and low standby current are mandatory. The 4 V to 40 V input covers 24 V nominal +/-20% tolerance plus reverse-polarity protection diode drop, while the 15 uA quiescent current is negligible against the sensor's own standby draw. The 5.0 V fixed output drives industrial 5 V transceivers, isolated digital inputs, and 4-20 mA loop converters. The -40 C to +125 C junction rating supports outdoor and factory-floor deployments, and the SOT-223 tab enables compact sensor head designs without external thermal management.
Recommended
Automotive ECU Wake-Up Circuits
In automotive ECU standby circuits, the TPS7B6950QDCYRQ1 supplies a 5.0 V keep-alive rail that monitors the CAN bus for wake-up frames while the ECU is in sleep mode. The 15 uA quiescent current contributes minimally to the ECU's overall sleep budget (typically <100 uA total), and the lack of an enable pin keeps the external circuit simple. The 150 mA output is sufficient to power the CAN transceiver plus a small watchdog MCU during wake-up. AEC-Q100 grade 1 qualification plus 40 V load-dump survival make it robust for direct connection to the 12 V battery rail with only a TVS for transient clamping.
Recommended
Battery-Backed Always-On Memory Power
For automotive black-box or event-data recorder (EDR) applications, the TPS7B6950QDCYRQ1 provides a clean 5.0 V rail to non-volatile memory and RTC circuits that must retain data through battery disconnect events. The wide 4 V to 40 V input operates directly from a 12 V backup battery and tolerates charging-system transients. The 15 uA quiescent current is negligible compared to the RTC's own draw, and the SOT-223 footprint enables compact placement near the memory ICs on the PCB. The integrated thermal shutdown protects the LDO and surrounding components during fault conditions. AEC-Q100 qualification supports integration into airbag and crash-data recording modules.
Recommended
Recommended Products Summary
Engineering reference data for TPS7B6950QDCYRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS7B6933QDCYRQ1 | TPS7B6925QDCYRQ1 | TPS7B6950QDCYR | TPS7B6950QDCYRQ1G4 |
|---|---|---|---|---|---|
| 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 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 5.0 V | 3.3 V | 2.5 V | 5.0 V | 5.0 V |
| Input Voltage Range | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V |
| Maximum Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA |
| Quiescent Current | 15 uA | 15 uA | 15 uA | 15 uA | 15 uA |
| Automotive Grade | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) | No (commercial) | Yes (AEC-Q100) |
| 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 +125 C |
Key Differentiators
- 5.0 V fixed output matches legacy 5 V automotive rails (vs TPS7B6933QDCYRQ1)
- Higher output voltage covers broader 5 V system base (vs TPS7B6925QDCYRQ1)
- Automotive AEC-Q100 qualified vs commercial-grade variant (vs TPS7B6950QDCYR)
Design Notes
Estimated: at VIN=12 V, VOUT=5 V, IOUT=150 mA, power dissipation = (12-5) x 0.150 = 1.05 W. With the SOT-223 (DCY) theta_JA of approximately 55 C/W on a 1 oz copper pad, the junction temperature rises about 58 C above ambient. At 25 C ambient this yields ~83 C junction, well within the 125 C rating. At 85 C under-hood ambient, junction reaches ~143 C - the thermal shutdown will engage. Reduce VIN or improve PCB copper pour for high-ambient deployments.
Minimize equivalent series inductance (ESL) and ESR to maximize performance and ensure stability. Place every capacitor as close as possible to the device and on the same side of the PCB as the regulator. Do not place any of the capacitors on the opposite side of the PCB from where the regulator is installed. Use a 1 oz copper pour under the SOT-223 tab to spread heat; the tab must be soldered to the pad for both thermal and electrical (GND) connection.
Do not exceed 40 V on the input pin, including load-dump transients. For automotive 12 V buses, add a TVS diode (e.g., SMBJ33A) upstream to clamp transients below 40 V. The device has no enable pin - it runs whenever VIN exceeds UVLO. If sequencing is required, use an external MOSFET or PGOOD signal from an upstream regulator. The exposed tab is internally connected to GND - do not float it on the PCB.
Compliance Information
AEC-Q100 automotive qualified per TI product page. RoHS and REACH compliant. Lead-free finish. Halogen-free status not explicitly stated in verified data - marked unknown.
