onsemi MC34064P-5RAG

Overview

MC34064P-5RAG from onsemi is a precision undervoltage sensing circuit designed as a reset controller for 5 V microprocessor systems. It features a trimmed-in-package bandgap reference, 4.6 V comparator threshold at 25 °C, built-in hysteresis, open-collector reset output sinking >10 mA, and guaranteed operation down to 1.0 V input supply - enabling reliable power-on reset in appliance and industrial control units.

For engineers reviewing the MC34064P-5RAG datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package compatibility, 4.6 V ±0.1 V threshold tolerance over temperature, low 390 µA quiescent current, and integrated clamp diode for delay capacitor discharge in reset timing circuits.

Technical Context

The MC34064P-5RAG implements a precision voltage comparator with a temperature-compensated bandgap reference and internal hysteresis of 20 mV to prevent oscillatory reset behavior during slow-rising or noisy supply rails. Its comparator monitors the input voltage against a fixed 4.6 V threshold and asserts an active-low open-collector reset signal when Vin falls below the lower threshold (≈4.58 V).

It operates across 1.0 V to 6.5 V input range with guaranteed functionality at 1.0 V, leveraging low standby current (typ. 390 µA) and internal clamp diode (VF = 0.9 V @ 10 mA) between Reset and Input pins to enable simple RC-based reset delay networks without external components.

Key Specifications

Pinout & Package

MC34064P-5RAG is housed in a Pb-free TO-92 (Case 29-10) through-hole package with bent leads, rated for 1 W dissipation and thermal resistance R_JA = 200 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar undervoltage sensing applications.

Compared with MC33064P-5RAG and TPS3808G01DBVR, the MC34064P-5RAG offers lowest BOM cost and minimal external component count for fixed 5 V reset, while trading off temperature range and ultra-low power for proven TO-92 manufacturability and integrated timing diode.

Availability

MC34064P-5RAG is available at Aetrix Electronics and suitable for microprocessor reset, industrial power supply supervision, and appliance brown-out protection requiring stable component supply and long-term obsolescence management.

Supply support for MC34064P-5RAG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.

The MC34064 series belongs to onsemi's supervisory IC product line, engineered specifically for cost-sensitive, high-reliability reset control in 5 V microprocessor systems - emphasizing simplicity, robustness, and ease of integration.

FAQ

What is the exact reset threshold voltage of MC34064P-5RAG and how does it vary with temperature?

The MC34064P-5RAG has a nominal comparator threshold of 4.6 V at 25 °C, with min/max values of 4.5 V/4.7 V across its 0 °C to +70 °C operating range. Electrical Characteristics table confirms ±0.1 V tolerance over temperature, and Figure 4 shows threshold drift remains within ±10 mV from 0 °C to 70 °C - making it suitable for stable 5 V rail monitoring without recalibration.

Can MC34064P-5RAG operate with a 3.3 V supply, and what is its minimum functional input voltage?

Yes, MC34064P-5RAG supports input voltages from 1.0 V to 6.5 V per Absolute Maximum Ratings and Electrical Characteristics tables. Its reset output remains functional down to 1.0 V input, though the 4.6 V threshold implies it will assert reset continuously below that level - making it usable for 3.3 V systems when configured with a resistor divider to scale the monitored rail into the 4.6 V detection window.

Does MC34064P-5RAG require external components to generate a timed reset delay?

No external diode is needed: MC34064P-5RAG integrates a clamp diode between Reset and Input pins (VF = 0.9 V @ 10 mA), enabling a self-timed reset delay using only one resistor and one capacitor. As shown in Figure 9, connecting CDLY from Reset to Input creates a delay where t_DLY ≈ R × CDLY × ln(1/(1 − V_th(MPU)/V_CC)), eliminating discrete diode placement.

What is the maximum sink current capability of the MC34064P-5RAG reset output?

The MC34064P-5RAG reset output is specified to sink ≥10 mA continuously (ISink min = 10 mA in Electrical Characteristics), with typical performance up to 27 mA and absolute maximum of 60 mA. This allows direct interfacing with TTL inputs, CMOS gates, or small-signal relays without external driver transistors - verified under Vin = 4.0 V test condition.

Is MC34064P-5RAG RoHS compliant and what package type does it use?

Yes, MC34064P-5RAG is Pb-free and RoHS compliant, as confirmed in the Features section and Ordering Information table. It uses the TO-92 plastic package (Case 29-10), supplied in tape-and-reel format (2,000 units/reel), with bent leads and 1 W power rating - matching industry-standard through-hole footprint for manual or automated insertion.