MC34064D-5G - 4.59V UVLO Reset Controller | onsemi | 8-SOIC
N.º da peça: MC34064D-5G ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.72 | $0,72 |
| 10 | $0.61 | $6,10 |
| 100 | $0.48 | $48,00 |
| 500 | $0.39 | $195,00 |
| 1.000 | $0.34 | $340,00 |
| 3.000 | $0.27 | $810,00 |
MC34064D-5G Visão geral
A voltage supervisor (or voltage monitor / reset IC) is a type of power management integrated circuit that observes a system supply rail and generates a deterministic logic-level reset signal whenever that rail falls outside a safe operating window. Supervisors sit hierarchically beneath DC-DC converters and LDOs in the power tree, downstream of the regulator that establishes the rail they monitor and upstream of the microcontroller, FPGA, or ASIC that consumes the rail. The MC34064 family in particular targets legacy 5 V logic and early-generation microcontrollers where brownout-induced code corruption was a common failure mode.
Key features of the MC34064D-5G include a trimmed-in-package bandgap reference, a comparator with precise thresholds and built-in hysteresis to prevent erratic reset operation, and an open-collector (open-drain) reset output that can be wire-ORed with other reset sources. The threshold is internally fixed at 4.59 V (typical), and the part draws a quiescent supply current of approximately 1 mA during normal operation, dropping to roughly 0.5 mA once a reset has been asserted.
Technically, the MC34064 uses a bipolar process with an internal 2.5 V bandgap reference, scaled and trimmed to produce the 4.59 V undervoltage lockout (UVLO) trip point. Hysteresis of approximately 0.4 V is added by an internal feedback network, preventing chattering when VCC hovers near the threshold. The open-collector output requires an external pull-up resistor to the logic supply of the monitored system (commonly 5 V or 3.3 V), enabling logic-level translation.
Typical applications include 5 V microprocessor and microcontroller reset circuits, UPS and battery-backed system controllers, automotive powertrain modules (with NCV33064 variant), industrial PLC logic supervision, and any 5 V system requiring a hardware brownout reset. The wide operating temperature range of -40C to +125C supports both commercial and industrial environments.
When designing with this device, choose the external pull-up resistor to balance rise time against current consumption: a 10 kohm resistor yields a fast reset de-assertion edge with about 500 uA quiescent draw into the pull-up. The reset output must be debounced in software if the monitored rail has high ripple content.
This page synthesizes distributor pricing, drop-in same-brand variants, and practical reset-circuit design notes not found in the onsemi datasheet alone.
Alternativas drop-in para MC34064D-5G — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC34064D-5G
✅ Drop-In✓ Em estoque
$0.27 / unidade
Ver ficha técnica →MC34064D-005G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC34064D-5R2G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC33064D-5G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NCV33064D-5R2G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX6323
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC34064D-5G Especificações
| Função | Undervoltage Sensing Circuit / Reset Controller |
| Number of Voltages Monitored | 1 |
| Reset Threshold (Typ) | 4.59 V |
| Monitored Voltage | 5 V nominal |
| Reset Output Type | Open Drain or Open Collector |
| Reset Active Level | Active Low |
| Minimum Reset Sink Current | 10 mA |
| Operating Supply Current (Typ) | 1 mA (no load) |
| Faixa de temperatura de operação | -40C to +125C |
| Encapsulamento / Caixa | 8-SOIC (0.154 inch / 3.90 mm width) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead-Free | Yes (G suffix indicates Pb-free) |
| External Components Required | 1 external resistor (pull-up) |
Configuração de pinos do MC34064D-5G
| Pino 1 | VCC — Supply voltage (5V nominal) |
| Pino 2 | NC — Not connected (per datasheet) |
| Pino 3 | NC — Not connected (per datasheet) |
| Pino 4 | NC — Not connected (per datasheet) |
| Pino 5 | GND — Ground |
| Pino 6 | NC — Not connected (per datasheet) |
| Pino 7 | NC — Not connected (per datasheet) |
| Pino 8 | RESET — Active-low open-drain reset output |
Aplicações típicas
MC34064D-5G é adequado para 6 aplicaçãos: 5V Microprocessor Reset Circuit, Industrial PLC Logic Supervisor, Automotive ECU Brownout Monitor, Battery-Backed System Supervisor, Vending Machine / Point-of-Sale Controller, Test Equipment Front-End Protection.
5V Microprocessor Reset Circuit
The MC34064D-5G is purpose-built for 5V microprocessor and microcontroller reset supervision in legacy and industrial systems. Its 4.59V internal threshold sits below the 5V nominal rail but above the brownout voltage where most MPU/MCU families begin executing corrupted code, providing a guaranteed hardware reset before VCC collapses further. The open-drain output connects directly to the reset pin of legacy 8051, HC11, PIC, and similar 5V cores without a buffer. The 10mA minimum sink current easily holds the line low even with capacitive loading from the MPU reset pin and PCB traces. Engineers typically place a 10kohm pull-up to VCC and a 0.1uF bypass cap adjacent to the VCC pin, which yields a clean reset de-assertion edge and stable operation across the -40C to +125C range.
Recomendado
Industrial PLC Logic Supervisor
In industrial PLC and process-control systems, the MC34064D-5G monitors the 5V logic supply rail that powers I/O modules, communication transceivers, and CPU subsystems. The 4.59V threshold ensures the supervisor fires before downstream analog and digital logic rails drop out of regulation, preventing latch-up or erroneous I/O transitions. The -40C to +125C industrial temperature range supports cabinet-mounted and outdoor installations, while the wide hysteresis band prevents nuisance resets from supply transients caused by motor inrush, relay switching, or solenoid kickback. The open-collector output allows wire-ORing with watchdog timers or manual reset pushbuttons, providing multi-source reset capability for safety-critical PLCs.
Recomendado
Automotive ECU Brownout Monitor
Although the standard MC34064D-5G is industrial-grade, the same die is offered as the NCV33064D-5R2G for automotive powertrain, body, and chassis ECUs where AEC-Q100 qualification is required. The part monitors the 5V microcontroller rail and asserts reset during cranking events when battery voltage drops below the 4.59V threshold, preventing EEPROM corruption and firmware lockup. The open-drain output interfaces directly to automotive MCU reset pins with a 10kohm pull-up to the regulated 5V rail. Hysteresis prevents repeated reset toggling during load-dump recovery transients. Designers must verify AEC-Q100 qualification and EMI/ESD compliance per the automotive variant datasheet before substituting the standard part.
Recomendado
Battery-Backed System Supervisor
The MC34064D-5G is well-suited to UPS, alarm panel, and battery-backed microcontroller systems where it monitors the main 5V supply derived from a wall adapter or battery charger. When mains power fails, the rail decays through the 4.59V threshold and the supervisor asserts reset, allowing the MCU to enter a low-power shutdown sequence before the rail collapses further. The 1mA typical quiescent current is acceptable during battery backup because the supervisor only needs to detect the brownout event - downstream load switching handles the bulk of the power-down work. For systems requiring <100uA quiescent draw, consider the TI TPS3823 family or Maxim MAX6323 as lower-power alternatives.
Recomendado
Vending Machine / Point-of-Sale Controller
Coin-operated vending machines and POS terminals rely on the MC34064D-5G to monitor their 5V logic rails powering the bill acceptor, coin changer, and display controller. The 4.59V threshold ensures reset is asserted before the microcontroller loses execution integrity, particularly when large solenoid drivers (coin return, change dispenser) draw transient currents that pull down the supply. The wide -40C to +125C rating supports both indoor retail and unheated outdoor kiosk environments. The minimal external component count (just one pull-up resistor) reduces BOM cost and PCB area in these cost-sensitive consumer applications.
Recomendado
Test Equipment Front-End Protection
Bench-top test instruments, data acquisition systems, and laboratory power supplies use the MC34064D-5G to monitor the 5V analog/digital rail driving the front-end signal conditioning and ADC front-end. The supervisor ensures the ADC and precision analog blocks are held in reset until the supply stabilizes above 4.59V, preventing spurious readings or calibration drift during power-up. The bipolar internal bandgap reference provides stable threshold accuracy over temperature, which is critical for repeatable measurement equipment. The open-drain output allows cascading with other supervisors monitoring additional rails (e.g., +/-15V analog supplies via external dividers).
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC34064D-5G — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC34064D-005G | MC34064D-5R2G | MC33064D-5G | NCV33064D-5R2G | MAX6323 |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | onsemi | onsemi | Analog Devices (Maxim) |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Reset Threshold (V) | 4.59 | 4.59 | 4.59 | 4.59 | 4.59 | 5.0 (typical) |
| Operating Temperature (C) | -40 to +125 | -40 to +125 | -40 to +125 | 0 to +70 | -40 to +125 (automotive) | -40 to +85 |
| Reset Output Type | Open-Drain | Open-Drain | Open-Drain | Open-Drain | Open-Drain | Open-Drain |
| AEC-Q100 Qualified | No | No | No | No | Yes | No |
Principais diferenciais
- Wide industrial temperature range with same footprint (vs MC33064D-5G)
- Drop-in automotive-qualified variant available (vs MC34064D-5G (this part))
- Minimal external component count (vs MAX6323 (Maxim/ADI))
Notas de projeto
The MC34064D-5G draws approximately 1 mA quiescent current from VCC under no-load conditions, dropping to ~0.5 mA when reset is asserted. Place a 0.1 uF ceramic bypass capacitor as close as possible to the VCC pin (pin 1) to suppress high-frequency noise that could cause false reset triggering. For noisy industrial environments, add a 10 ohm series resistor with a 1 uF tantalum bulk capacitor on VCC to filter supply transients. Estimated: total quiescent draw through the pull-up resistor (10 kohm to 5V) adds ~0.5 mA, giving total system quiescent ~1.5 mA.
Critical pitfalls: (1) Do NOT use the MC34064D-5G on 3.3V systems - the 4.59V threshold will hold the part permanently in reset. Use the MC34064D-3G (3.06V threshold) for 3.3V rails. (2) The open-drain output requires an external pull-up resistor; without one, the reset line never reaches a logic-high level and the system stays in reset forever. (3) Pins 2, 3, 4, 6, 7 are NC per the datasheet and must be left floating or grounded - they are not internally bonded and must not be tied to signals that source current into the die.
Route the VCC trace directly from the regulator output to pin 1 of the MC34064D-5G with minimal trace length and inductance. Keep the pull-up resistor close to pin 8 (RESET) to minimize noise coupling into the reset line. Avoid routing noisy signals (switching node of a nearby DC-DC, relay coil drive) near the RESET trace, as capacitive coupling can inject glitches that momentarily de-assert reset. For multilayer boards, place a ground pour under the SOIC package and stitch vias around the perimeter to provide a low-impedance return path for the bandgap reference.
Informações de conformidade
G suffix denotes lead-free (Pb-free) finish per onsemi ordering scheme. RoHS compliant. For automotive applications, use the NCV33064D-5R2G variant which is AEC-Q100 qualified.
