BD49E27G-MTR - 2.7V CMOS Voltage Detector, SSOP-5 | ROHM
料号： BD49E27G-MTR ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.84 | $8.40 |
| 100 | $0.62 | $62.00 |
| 500 | $0.48 | $240.00 |
| 1,000 | $0.39 | $390.00 |
BD49E27G-MTR 概述
A voltage detector (also called a voltage supervisor or reset IC) is a type of power management IC that monitors a system supply rail and asserts a reset signal whenever the monitored voltage drops below a precise internal threshold. Voltage detectors sit below voltage regulators and supervisors in the power-management hierarchy, and above simple comparators because they integrate an accurate bandgap reference, hysteresis, and a defined output stage. The BD49E27G-MTR uses a CMOS push-pull (totem-pole) output stage rather than an open-drain output, which means it actively drives the output high or low without needing an external pull-up resistor.
Key features include a 2.7V detection voltage with high accuracy (typically ±1% across the operating temperature range), very low quiescent current (in the single-digit microamp range), a CMOS output stage that can source and sink current, and built-in hysteresis to prevent chattering near the threshold. The 5-SSOP package provides a compact footprint suitable for space-constrained designs. Automotive-grade (-M) qualification means the device has been characterized for the extended temperature ranges and reliability demanded by vehicle electronics.
Typical applications include microcontroller reset supervision in automotive ECUs, body and chassis control modules, infotainment system power-good indication, battery-pack monitoring, and any 3.3V or 5V logic rail that requires a deterministic reset signal at power-up, power-down, or brownout conditions. The 2.7V threshold is particularly suited to 3.3V rails that must be considered valid only after the rail has stabilized well above its minimum operating voltage.
When designing with this part, place the bypass capacitor recommended in the datasheet as close as possible to the VCC pin to prevent false triggering from supply noise. The CMOS output eliminates the need for an external pull-up but the trace from the output to the microcontroller reset pin should be kept short to minimize EMI coupling. This page synthesizes distributor pricing, lifecycle status, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： BD49E27G-MTR ——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：
BD49E27G-M
✅ 直接替换📋 参考替代料（不在目录中）
BD49E27G-TR
✅ 直接替换📋 参考替代料（不在目录中）
BD49E27G
✅ 直接替换📋 参考替代料（不在目录中）
BD49E27G-MTR 规格参数
| 功能 | Voltage detector (voltage supervisor / reset IC) |
| Detection Voltage (VDET) | 2.7 V |
| 输出类型 | CMOS (push-pull, totem-pole) |
| 输出配置 | Active low reset |
| Number of Channels | 1 |
| 工作温度范围 | -40 °C to +125 °C (automotive grade) |
| 封装 | 5-SSOP (SSOP-5) |
| 安装类型 | Surface Mount |
| Hysteresis | Built-in (datasheet typical value) |
| Automotive Qualification | Yes (-M suffix = automotive grade) |
| RoHS 状态 | Compliant |
| 生命周期状态 | Not Recommended for New Designs (NRND) |
BD49E27G-MTR 引脚配置
| 引脚 1 | VCC — Supply voltage / monitored rail input |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | OUT — CMOS push-pull reset output (active low) |
| 引脚 4 | NC — Not connected (per datasheet) |
| 引脚 5 | NC — Not connected (per datasheet) |
典型应用
BD49E27G-MTR 适用于 6 应用s: Automotive ECU Microcontroller Reset, Body & Chassis Control Module Power-Good, Infotainment System 3.3 V Rail Supervisor, Battery-Pack Cell Monitor Reset, Sensor Module Power Sequencing, Industrial PLC Logic Rail Reset.
Automotive ECU Microcontroller Reset
The BD49E27G-MTR is well suited to automotive ECU microcontroller reset supervision because its 2.7 V detection voltage aligns with the minimum valid VCC for most 3.3 V automotive MCUs (e.g., RH850, SPC5, Aurix). The CMOS push-pull output actively drives the reset line both high and low, so the ECU firmware sees a clean, defined logic level at power-up, brownout, and power-down. The automotive-grade -M qualification ensures the part survives the -40 °C to +125 °C underhood temperature range. Place a 0.1 µF ceramic bypass close to VCC and keep the reset trace short to prevent EMI-induced false resets in the noisy automotive electrical environment.
推荐
Body & Chassis Control Module Power-Good
Body control modules (BCMs) and chassis controllers require deterministic power-good signaling for safe operation of motors, lighting drivers, and CAN transceivers. The BD49E27G-MTR's 2.7 V threshold and CMOS push-pull output provide a clean PG signal to a gate-driver or motor-driver enable pin, preventing partial-rail turn-on that could cause FET shoot-through. Its sub-microamp quiescent current minimizes standby drain on the always-on battery rail. The 5-SSOP package fits beneath the BCM connector header where taller packages would not fit. Automotive qualification allows direct mounting near the BCM housing without additional thermal management.
推荐
Infotainment System 3.3 V Rail Supervisor
In-vehicle infotainment (IVI) systems run processors and SoCs on tightly regulated 3.3 V rails that must reach a stable minimum voltage before the SoC releases its reset. The BD49E27G-MTR monitors the 3.3 V rail and asserts reset until VCC exceeds 2.7 V, giving the SoC time to lock its PLL and boot cleanly. The CMOS output connects directly to the SoC reset pin without a pull-up, simplifying the BOM. Built-in hysteresis prevents chattering if the rail sags near the threshold during heavy SoC bursts. Automotive -M qualification matches the infotainment thermal profile of -40 °C to +85 °C in-cabin.
推荐
Battery-Pack Cell Monitor Reset
Battery management systems (BMS) for e-mobility require a supervisor to hold the cell-monitor MCU in reset until the pack voltage exceeds a safe threshold. The BD49E27G-MTR provides this function for 3.3 V-regulated BMS MCUs, asserting reset on brownout events that could otherwise cause the MCU to execute from corrupted memory. Its low quiescent current minimizes parasitic drain on the battery when the pack is in storage. The CMOS push-pull output stage is rugged against the noisy switching environment of a multi-cell Li-ion pack. The 5-SSOP footprint allows mounting adjacent to the cell-monitor IC on compact BMS PCBs.
推荐
Sensor Module Power Sequencing
Automotive sensor modules - radar, lidar, camera ECU sub-boards - often run on distributed 3.3 V rails generated locally from a higher bus voltage. The BD49E27G-MTR supervises the local 3.3 V rail and asserts reset to the sensor signal conditioner or ADC until the rail is stable. The 2.7 V threshold guarantees that low-voltage analog blocks operate within their linear range. Its tiny 5-SSOP footprint fits beneath BGA packages and dense sensor PCB layouts. CMOS output avoids the need for a pull-up on the often-crowded reset net. Automotive -M grade qualification supports underhood or behind-bumper mounting where temperature swings are large.
推荐
Industrial PLC Logic Rail Reset
For industrial PLCs that require a deterministic reset on the 3.3 V logic rail, the BD49E27G-MTR can be deployed in non-automotive industrial variants (BD49E27G-TR / BD49E27G). The 2.7 V threshold accommodates 3.3 V rails with up to 18 % tolerance, ensuring reset is asserted before any logic device enters an indeterminate state. CMOS push-pull output is compatible with modern low-voltage MCUs and FPGAs that do not tolerate slow RC rise times on their reset pins. The 5-SSOP package fits in standard PLC backplane and module form factors. For factory automation environments, the wide hysteresis prevents false resets from switching-converter ripple.
推荐
推荐产品汇总
工程参考数据： BD49E27G-MTR ——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 | BD49E27G-M | BD49E27G-TR | BD49E27G |
|---|---|---|---|---|
| Package | 5-SSOP | 5-SSOP - same | 5-SSOP - same | 5-SSOP - same |
| Brand | ROHM Semiconductor | ROHM Semiconductor - same | ROHM Semiconductor - same | ROHM Semiconductor - same |
| Detection Voltage | 2.7 V | 2.7 V | 2.7 V | 2.7 V |
| Output Type | CMOS push-pull | CMOS push-pull | CMOS push-pull | CMOS push-pull |
| Automotive Grade (AEC-Q100) | Yes (-M suffix) | Yes (-M suffix) | No (standard grade) | No (standard grade) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C (per datasheet) | -40 °C to +125 °C (per datasheet) |
| Packaging Form | Tape & Reel (-TR) | Ammo pack / tray | Tape & Reel | Ammo pack / tray |
| Lifecycle Status | NRND | NRND | NRND | NRND |
关键差异点
- Automotive-grade (-M) qualification with same die as standard grade （对比 BD49E27G-TR)
- Tape-and-reel packaging ready for high-volume SMT （对比 BD49E27G-M)
- CMOS push-pull output eliminates external pull-up resistor （对比 Open-drain supervisors (e.g., competitor TPS3xxx series))
设计说明
Place a 0.1 µF X7R ceramic bypass capacitor as close as possible to the VCC pin (pin 1) of the BD49E27G-MTR, with a short, wide trace to the GND pin (pin 2). Switching-converter ripple and digital switching noise on the monitored rail can otherwise cause false reset assertions; the bypass capacitor filters high-frequency noise that the internal reference cannot reject. Keep the trace from the OUT pin (pin 3) to the MCU reset pin short and routed away from noisy signals or switching nodes to prevent EMI coupling.
Estimated: at the absolute maximum operating temperature of +125 °C and the SSOP-5 package thermal resistance of approximately 250 °C/W (datasheet figure), the BD49E27G-MTR dissipates only milliwatts in normal use, so no heatsink is required. However, when used near other high-power devices, ensure the local ambient temperature stays within the -40 °C to +125 °C automotive window. Confirm thermal margin by measuring the actual case temperature in your enclosure during worst-case operating conditions.
Do not load the CMOS push-pull OUT pin with a pull-up or pull-down resistor unless the datasheet explicitly permits it; the internal totem-pole driver actively drives both high and low, so external resistors create a resistive divider that shifts the output logic level. Also, verify the detection voltage tolerance band of your specific lot against your minimum VCC specification - ±1 % on a 2.7 V threshold is ±27 mV, which is well within the noise margin of a 3.3 V rail but tight against a 2.8 V rail.
合规信息
AEC-Q100 qualified per -M suffix. RoHS and REACH compliant per ROHM product page. Lifecycle status: Not Recommended for New Designs (NRND).
