Diodes Incorporated PT8A2512NE

Overview

PT8A2512NE from Pericom Technology is a dedicated CMOS LSI toaster controller IC in TO-94 package, providing a single-chip 30-second timed relay activation with internal oscillator (f_OSC = 1.024 kHz typical), power-on reset, and high-active relay drive output. It operates from 3.5–5.5 V, consumes ≤100 µA, and drives up to 20 mA for direct electromechanical relay control in basic toaster appliances.

For engineers reviewing the PT8A2512NE datasheet, PT8A2512NE pinout, PT8A2512NE application, or PT8A2512NE equivalent, key selection criteria include its fixed 30-s timer behavior, RC-tunable oscillator frequency, GND-referenced relay output, and absence of external timing capacitors - critical for cost-sensitive, low-complexity thermal appliance control.

Technical Context

The PT8A2512NE integrates a precision RC oscillator (952–1096 Hz), a binary frequency divider chain, and a power-on reset circuit to generate a deterministic 30-second active-high RELAY pulse after power application. No external timing capacitor is required - timing is set solely by external R_OSC/C_OSC on the OSC pin.

Its relay output delivers 20 mA sink/source capability at V_CC = 3.5 V, with VOL ≤ 0.5 V and VOH ≥ 2.0 V, enabling direct drive of small signal relays without buffer transistors. The chip lacks programmability, communication interfaces, or adjustable timeout - it is a fixed-function, single-purpose timing controller.

Key Specifications

Pinout & Package

PT8A2512NE is housed in a hermetically sealed TO-94 metal can package with 4 leads, designed for high-reliability, temperature-stable mounting on toaster control boards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar toaster timing controller applications.

Compared with PT8A2512NE, PT8A2511NE extends timing but offers no user interaction, while PT8A2513NE adds cancel logic at the expense of fixed-timer simplicity - making PT8A2512NE optimal for lowest-cost, no-button toaster designs.

Availability

PT8A2512NE is available at Aetrix Electronics and suitable for toaster control, compact appliance timers, low-cost bread toasters, and electromechanical appliance sequencers requiring stable component supply and long-lifecycle support.

Supply support for PT8A2512NE 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

Pericom Technology (now part of Diodes Incorporated) is a fabless semiconductor company specializing in interface, timing, and power management ICs for consumer and industrial electronics.

The PT8A25xx series is a dedicated family of fixed-timing LSI controllers targeting cost-sensitive, high-volume thermal appliances - designed to replace discrete timing circuits with integrated, factory-trimmed oscillator and relay drivers.

FAQ

Can PT8A2512NE be used with a 3.3 V supply?

No. The absolute minimum supply voltage is 3.5 V per the datasheet's Recommended Operating Conditions. At 3.3 V, oscillator startup fails and internal logic may not initialize reliably. Operation below 3.5 V voids timing accuracy and may cause intermittent relay activation or failure to assert output.

What is the maximum relay coil resistance supported?

With V_CC = 4.0 V and I_OL ≥ 0.5 mA (min), the maximum coil resistance is 8 kΩ. However, the datasheet specifies 20 mA drive capability - for reliable turn-on, coil resistance should be ≤200 Ω at 4 V (e.g., 5 V/20 mA relay). Higher resistance requires external transistor buffering.

Does PT8A2512NE support adjustable timeout?

No. Timeout is fixed at approximately 30 seconds based on internal divider ratio and nominal f_OSC = 1.024 kHz. While f_OSC can be tuned ±7% via R_OSC/C_OSC, this shifts timing linearly - it does not enable user-selectable durations or programmable modes.

Is the OSC pin strictly input-only or bidirectional?

The OSC pin is explicitly defined as I/O in the Pin Description table. It functions as an oscillator node where the chip sources and sinks current to sustain oscillation across the external RC network - not a passive input. Connecting it to a logic signal or fixed voltage will halt oscillation and disable timing.