TPS3808G33QDBVRQ1 - 3.3V Auto Voltage Supervisor | Texas Instruments
MPN: TPS3808G33QDBVRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.24 | $124.00 |
| 500 | $0.98 | $490.00 |
| 1,000 | $0.82 | $820.00 |
TPS3808G33QDBVRQ1 Overview
A voltage supervisor (also called a reset supervisor or power-on reset generator) is a power management IC that monitors a supply rail and asserts a RESET signal whenever the rail falls outside a preset window. Supervisors sit alongside LDOs and DC-DC converters in the broader power management IC hierarchy and are essential building blocks for microcontroller and DSP-based systems where deterministic startup behavior and brown-out protection are required.
Key features include 2.4 uA typical quiescent current, 10 ms to 10 s programmable reset delay time set by an external capacitor on the CT pin, 0.5% typical threshold accuracy, and a wide operating temperature range of -40C to +125C qualified to AEC-Q100 for automotive use. The open-drain RESET output allows wire-OR connection with other supervisory signals and direct interface to multi-voltage systems.
The TPS3808G33QDBVRQ1 uses a precision bandgap reference and a hysteretic comparator architecture to provide stable threshold detection across temperature and process variations. The MR input supports an external push-button reset and accepts slow or noisy signals through its built-in debounce. The CT programmable delay pin lets designers tune the reset pulse width to match downstream processor timing requirements.
Typical applications include automotive ECU power supervision, battery-powered IoT devices, industrial PLC controllers, and FPGA / MCU brown-out protection. In automotive body and chassis modules, the supervisor guarantees defined reset behavior during cranking transients and load-dump events.
When designing with this device, place the CT capacitor close to pin 6 and ensure pull-up on the open-drain RESET output matches the downstream logic level. Verify sense voltage accuracy across the full operating temperature range, and consider derating quiescent current at elevated temperatures.
This page synthesizes distributor pricing, automotive-grade cross-reference alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for TPS3808G33QDBVRQ1 — 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 TPS3808G33QDBVRQ1 (same form factor and footprint) — differing in Function, Package, Automotive Qualification, Input Voltage Range (VDD), MSL Level.
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View Datasheet →TPS3808G33QDBVRQ1 Specifications
| Function | Voltage Supervisor (Reset Generator) |
| Monitored Voltage | 3.3 V (fixed threshold) |
| Threshold Accuracy | 0.5% typical |
| Number of Voltages Monitored | 1 |
| Output Type | Open Drain / Open Collector |
| Reset Output | Active-Low |
| Input Voltage Range (VDD) | 1.8 V to 6.5 V |
| Sense Voltage Range | 0.4 V to 5 V |
| Quiescent Current (Iq) | 2.4 uA typical |
| Reset Timeout | Adjustable / Selectable (10 ms to 10 s via CT cap) |
| Manual Reset Input | Yes (active-low MR pin) |
| Operating Temperature | -40 C to +125 C |
| Automotive Qualification | AEC-Q100 qualified (Q1 suffix) |
| Package | SOT-23-6 (DBV) |
| Mounting Type | Surface Mount |
TPS3808G33QDBVRQ1 Pin Configuration
| Pin 1 | MR — Manual Reset input, active-low logic input with internal pull-up |
| Pin 2 | GND — Ground reference |
| Pin 3 | RESET — Active-low open-drain reset output; pull-up required |
| Pin 4 | CT — Reset delay timing capacitor; sets t_RST = 10 ms to 10 s |
| Pin 5 | VDD — Supply voltage input (1.8 V to 6.5 V) |
| Pin 6 | SENSE — Voltage sense input; monitored against 3.3 V threshold |
Typical Applications
TPS3808G33QDBVRQ1 is suitable for 6 applications: Automotive ECU Power Supervision, Battery-Powered IoT Sensor Node, Industrial PLC Controller Reset, FPGA / MCU Brown-Out Protection, Medical Monitoring Device, Networking Equipment Reset Supervisor.
Automotive ECU Power Supervision
The TPS3808G33QDBVRQ1's AEC-Q100 qualification and 2.4 uA quiescent current make it ideal for automotive body and chassis ECUs. It monitors the 3.3V MCU rail and asserts a clean active-low RESET during cranking transients and load-dump events when supply sag can corrupt processor state. Connected between the 3.3V LDO output and the MCU reset pin, it guarantees deterministic boot behavior. The -40C to +125C automotive temperature range covers underhood and cabin environments.
Recommended
Battery-Powered IoT Sensor Node
For coin-cell or Li-ion powered IoT sensors that sleep most of the time, the TPS3808G33QDBVRQ1's 2.4 uA Iq minimizes sleep current drain. It monitors the 3.3V rail generated by a boost converter and wakes the MCU only after a valid supply stabilizes. The MR pin supports a manual reset push-button for end-user reset without removing the battery. The 6-pin SOT-23 package fits in tight wearable and sensor housings.
Recommended
Industrial PLC Controller Reset
In industrial PLCs and process controllers, the TPS3808G33QDBVRQ1 provides deterministic brown-out protection for 3.3V logic rails feeding microcontrollers, FPGAs, and communication transceivers. The programmable CT delay (10 ms to 10 s) lets designers tune reset duration to match downstream processor startup requirements. The wide 1.8V to 6.5V VDD range tolerates 24V industrial bus transients stepped down by upstream regulators.
Recommended
FPGA / MCU Brown-Out Protection
FPGAs and high-performance MCUs can enter undefined states when core voltages droop below specification. The TPS3808G33QDBVRQ1 monitors the 3.3V auxiliary rail and asserts RESET before the core rail fails, preventing configuration corruption. The active-low open-drain output allows wire-OR with other supervisor outputs and direct connection to the FPGA's aux-driven reset network.
Recommended
Medical Monitoring Device
Patient monitoring equipment requires deterministic power-on behavior and brown-out detection for safety compliance. The TPS3808G33QDBVRQ1's tight 0.5% threshold accuracy ensures reset asserts within the precise voltage window required by medical-grade designs. The 2.4 uA Iq supports battery-backed operation during AC mains loss. MR input enables a clinician-facing manual reset without affecting patient monitoring state.
Recommended
Networking Equipment Reset Supervisor
Routers, switches, and wireless access points use the TPS3808G33QDBVRQ1 to monitor 3.3V rails feeding Ethernet PHYs and wireless SoCs. The open-drain RESET output allows multiple supervisors to share a common reset bus. Programmable reset delay accommodates slow-rising PoE-derived supplies, while the low Iq keeps standby power consumption within Energy Star limits for always-on networking gear.
Recommended
Recommended Products Summary
Engineering reference data for TPS3808G33QDBVRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS3808G33DBVR | TPS3808G25DBVR | TPS3823-33DBVR | TPS3813K33DBVR | MAX6791TPVD3+T | TPS3106K33DBVR |
|---|---|---|---|---|---|---|---|
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 - same | SOT-23-6 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated | Texas Instruments |
| Monitored Voltage | 3.3 V | 3.3 V | 2.5 V | 3.3 V | 2.93 V | 3.3 V | 3.3 V |
| Reset Delay | Adjustable (10 ms to 10 s) | Adjustable (10 ms to 10 s) | Adjustable (10 ms to 10 s) | Fixed 200 ms | Fixed 25 ms | Fixed ~35 ms | Fixed 130 ms |
| Manual Reset Pin | Yes | Yes | Yes | No | No | Yes | No |
| Output Type | Open Drain | Open Drain | Open Drain | Push-Pull | Open Drain | Push-Pull | Open Drain |
| AEC-Q100 Qualified | Yes | No | No | No | No | No | No |
Key Differentiators
- Lowest quiescent current in SOT-23-6 supervisor class (vs TPS3823-33DBVR)
- AEC-Q100 automotive qualification with same footprint as commercial grade (vs TPS3808G33DBVR)
- Programmable reset delay (10 ms to 10 s) vs fixed-delay alternatives (vs TPS3813K33DBVR)
Design Notes
Estimated: at VDD = 3.3V and a 10k pull-up to RESET, with quiescent current of 2.4 uA typical, the device draws negligible supply current. The CT capacitor value sets reset delay: t_RST (s) approximately equals C_CT (nF) x 1000 (per TI datasheet). For a typical 200 ms delay, use C_CT = 200 nF. For longer 1 s delay in motor-start applications, use 1 uF.
Do not leave the CT pin floating - it must be tied to a capacitor or to VDD (which selects the minimum 10 ms reset delay). Leaving CT open can cause undefined reset behavior and prevent the device from asserting RESET cleanly. Also ensure the RESET pull-up resistor value is sized correctly: too large (above 100 kohm) slows edges; too small (below 10 kohm) wastes current.
Place the TPS3808G33QDBVRQ1 within 5 mm of the MCU reset pin to minimize trace capacitance that could slow the open-drain RESET edge. Add a 0.1 uF ceramic bypass capacitor on VDD within 3 mm of pin 5. Keep the SENSE trace away from switching noise sources like DC-DC inductor or gate-drive traces. Use a guard ring around SENSE if high-impedance analog signals are nearby.
Compliance Information
AEC-Q100 qualified per TI product page (Q1 suffix). RoHS and REACH compliant per distributor listings. Lead-free and halogen-free per TI packaging specifications.
