TPS3825-50DBVR - 5V SOT-23-5 Voltage Supervisor w/ Manual Reset | TI
부품 번호: TPS3825-50DBVR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.18 | $11.80 |
| 100 | $0.86 | $86.00 |
| 500 | $0.72 | $360.00 |
| 1,000 | $0.59 | $590.00 |
| 3,000 | $0.48 | $1,440.00 |
TPS3825-50DBVR 개요
A voltage supervisor, also known as a reset IC or voltage monitor, is a power management device that observes a system supply rail and asserts a reset signal whenever the rail falls below a precise threshold. The device category sits hierarchically under supervisors and reset ICs, then power management, then power management ICs, and ultimately semiconductors. Supervisors prevent microcontrollers, DSPs, FPGAs, and ASICs from executing code with an under-voltage supply, which can cause unpredictable latch-up or memory corruption.
Key features include a fixed 5.0V supply voltage supervision range, push-pull totem-pole RESET output topology, manual reset input (MR), an integrated watchdog timer, and a power-on reset generator that asserts when VDD exceeds 1.1V. The RESET signal stays asserted for a fixed delay time after VDD recovers, allowing the downstream processor's clock and PLL to stabilize before code execution resumes. The SOT-23-5 footprint makes it compatible with space-constrained portable and embedded designs.
The TPS3825-50DBVR architecture combines a precision bandgap reference, comparator, and timer block on a single die. During power-up the reset asserts immediately when VDD crosses 1.1V and remains asserted until VDD exceeds 4.55V (the 5V nominal threshold) plus the timeout delay. The watchdog subsystem expects a falling edge on the WDI pin within the watchdog window; failure to receive that edge asserts reset to indicate a firmware hang.
Typical applications include DSP and microcontroller supply monitoring in industrial controls, point-of-sale terminals, automotive infotainment (via the -Q1 grade), PLCs, and any 5V system requiring supervised power-up, brownout protection, and watchdog supervision. For 3.3V systems the related TPS3823-33 variant is recommended; for 3V systems use TPS3825-30.
When designing with this device, ensure the MR pin has a defined logic state (tie high through a pull-up resistor if unused) and that the WDI service routine toggles within the watchdog window. Decouple VDD with a 0.1uF ceramic capacitor placed within 5 mm of the pin.
This page synthesizes distributor stock, drop-in alternatives within the SOT-23-5 footprint, and design notes for supervisor selection that go beyond the manufacturer datasheet alone.
드롭인 대체품: TPS3825-50DBVR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
TPS3825-50DBVT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS3824-50DBVR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS3820-50DBVR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS3825-50QDBVRQ1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS3823-33DBVR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS3825-50DBVR 사양
| 기능 | Voltage supervisor with manual reset and watchdog |
| Number of Voltages Monitored | 1 |
| Threshold Voltage (Nominal) | 5.0 V |
| Reset Output Type | Push-Pull, Totem-Pole, Active-Low |
| Manual Reset Input | Yes |
| Watchdog Timer | Yes |
| Power-On Reset Threshold | 1.1 V (minimum VDD for RESET to assert during power-up) |
| Reset Delay Time | 200 ms (typical, factory-set) |
| 동작 온도 범위 | -40C to +85C |
| 패키지 | SOT-23-5 (DBV) 2.90 mm x 1.60 mm |
| 실장 유형 | Surface Mount |
| 핀 수 | 5 |
| MSL 레벨 | 1 |
| RoHS 상태 | Compliant |
| Lead-Free | Yes |
| Watchdog Input (WDI) | Yes (edge-triggered) |
TPS3825-50DBVR 핀 구성
| 핀 1 | GND — Ground reference |
| 핀 2 | RESET — Active-low reset output, push-pull totem-pole |
| 핀 3 | MR — Manual reset input (active-low, internal pull-up) |
| 핀 4 | WDI — Watchdog timer input (edge-triggered) |
| 핀 5 | VDD — Supply voltage input, supervised rail (5.0V nominal) |
일반적인 애플리케이션
TPS3825-50DBVR 적합 용도: 6 애플리케이션s: DSP and Microcontroller Supply Supervision, Industrial PLC and Controller Boards, Point-of-Sale Terminals, Automotive Infotainment (via -Q1 Grade), FPGA Configuration Supervisor, Battery-Backed 5V Embedded Systems.
DSP and Microcontroller Supply Supervision
The TPS3825-50DBVR supervises a 5.0V DSP or microcontroller supply rail and asserts an active-low RESET signal whenever VDD falls below 4.55V, preventing code execution from corrupted memory during brownout events. With a 200 ms fixed reset delay and integrated watchdog timer, the part is purpose-built for DSP, MCU, and ASIC systems requiring deterministic startup sequencing. The 15 uA typical supply current adds negligible load to the 5V rail, and the SOT-23-5 footprint fits within dense processor power sections. WDI must be serviced by firmware within the watchdog window to prevent reset assertion due to firmware lockup.
추천
Industrial PLC and Controller Boards
In PLC and industrial controller applications, the TPS3825-50DBVR monitors 24V-to-5V post-regulated rails and provides fail-safe reset signaling to the logic controller. The 4.55V fixed threshold ensures the reset is asserted before the MCU enters an unpredictable under-voltage state, and the 200 ms delay accommodates DC-DC converter soft-start before code execution resumes. The integrated watchdog detects firmware hangs common in real-time control loops and the manual reset input supports a front-panel reset button. The -40C to +85C operating range covers typical industrial enclosure environments.
추천
Point-of-Sale Terminals
POS terminals combine a 5V-powered ARM Cortex application processor with secure payment ICs that must not boot during unstable supply conditions. The TPS3825-50DBVR provides both supply voltage monitoring and watchdog supervision in a single 5-pin package, reducing BOM cost versus separate supervisor and WDT ICs. The push-pull totem-pole output drives the processor reset pin directly without external pull-up components. The integrated manual reset input supports a service technician reset button on the terminal chassis.
추천
Automotive Infotainment (via -Q1 Grade)
For automotive infotainment head units and instrument clusters powered by 5V rails, the AEC-Q100-qualified TPS3825-50QDBVRQ1 (same silicon as the TPS3825-50DBVR) supervises the infotainment SoC and provides watchdog supervision for ASIL-rated software. The active-low RESET is compatible with most automotive SoC reset inputs, and the integrated watchdog eliminates the need for a separate WDT peripheral. Designers select the -Q1 grade to satisfy automotive PPAP and quality requirements while reusing identical PCB land patterns.
추천
FPGA Configuration Supervisor
FPGAs require a stable supply rail and a minimum reset pulse width before configuration data is loaded from flash memory. The TPS3825-50DBVR provides the 200 ms fixed reset delay that ensures the FPGA's internal POR and PLL lock completes before INIT_B is released, avoiding spurious reconfiguration events. The 5.0V threshold is well-matched to FPGA auxiliary and I/O bank supplies that share a common 5V regulator with the host processor. The watchdog can supervise a soft-core CPU inside the FPGA fabric.
추천
Battery-Backed 5V Embedded Systems
In battery-backed embedded systems with a 5V primary rail and a 3V coin-cell RTC backup, the TPS3825-50DBVR supervises the main 5V rail while the RTC maintains timekeeping through brownout events. The supervisor's 1.1V minimum VDD assertion threshold ensures RESET is asserted even when the 5V rail collapses to battery levels, protecting the application processor. The push-pull output level-shifts cleanly to the processor's reset domain. The 15 uA quiescent current contributes minimally to standby power budgets.
추천
추천 제품 요약
엔지니어링 참조 데이터: TPS3825-50DBVR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | TPS3825-50DBVT | TPS3824-50DBVR | TPS3820-50DBVR | TPS3825-50QDBVRQ1 | TPS3823-33DBVR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | 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 | SOT-23-5 (DBV) - same |
| Threshold Voltage | 5.0 V (4.55 V trip) | 5.0 V (identical) | 5.0 V | 5.0 V | 5.0 V | 3.3 V (3.08 V trip) |
| Reset Output Polarity | Active-Low | Active-Low | Active-High | Active-Low | Active-Low | Active-Low |
| Manual Reset Input | Yes | Yes | Yes | Yes | Yes | Yes |
| Watchdog Timer | Yes | Yes | Yes | No | Yes | Yes |
| Reset Delay Time | 200 ms | 200 ms | 200 ms | 200 ms | 200 ms | 200 ms |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| AEC-Q100 Qualified | No | No | No | No | Yes | No |
주요 차별점
- Integrated watchdog plus manual reset in SOT-23-5 (vs TPS3820-50DBVR)
- Active-low reset polarity for standard MCUs (vs TPS3824-50DBVR)
- Automotive grade option with same footprint (vs TPS3825-50QDBVRQ1)
설계 노트
Decouple VDD with a 0.1uF X7R ceramic capacitor placed within 5 mm of pin 5. The TPS3825-50DBVR draws 15 uA typical quiescent current which is negligible compared to typical MCU supply currents, but inadequate decoupling can cause false RESET assertions during load transients on the 5V rail. Place the bypass capacitor on the same PCB side as the IC with a direct via-to-ground connection to the inner ground plane.
If the manual reset (MR) pin is unused, tie it to VDD through a 100 kohm pull-up resistor - do not leave MR floating. A floating MR pin can pick up noise from adjacent switching signals and cause spurious resets. The TPS3825 datasheet specifies that MR is internally pulled high, but a floating PCB trace can capacitively couple transient noise that overrides the weak internal pull-up.
Route the RESET output (pin 2) as a short trace directly to the processor reset input without passing through any vias or test points. Long RESET traces can pick up noise and cause spurious reset assertions. Keep RESET trace away from switching converter switch-node traces and clock signals. If a test point is required, place it at the far end near the processor pin to minimize stub length.
규정 준수 정보
Standard TPS3825-50DBVR is NOT AEC-Q100 qualified; for AEC-Q100 use the TPS3825-50QDBVRQ1 variant. RoHS and lead-free per TI product page. REACH compliance status inferred from TI product family datasheet; refer to latest TI declaration for confirmation.
