Product Overview
The Motorola Chip That Decided When a Switching Supply Turns Off
Condition
Unused, new old stock. The photographed piece is a black plastic 14-pin DIP with the Motorola M logo, a first line reading MC34060AP and a second line reading KEX9449. The pin-1 dimple and the end notch are legible at the left end of the body, and the leads in both rows are bright metal and sitting straight and in line. The sample was photographed resting on pink antistatic foam on our photo bench, and only the top face is shown, so the underside markings are not visible in these photos. Stock is more than one, so the photographed piece is representative of the group rather than the exact piece you receive, and the second-line code can vary from one piece to the next.
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Product Overview
The MC34060A is Motorola's precision SWITCHMODE pulse width modulation control circuit, and this one arrives in the through-hole 14-pin plastic DIP package on the standard 0.1 inch pin pitch and 0.3 inch row spacing that fits a common DIP-14 socket or footprint. It puts the complete PWM control block on one die: an on-chip oscillator that can run as master or slave, on-chip error amplifiers, an on-chip 5.0 V reference specified to 1.5 percent accuracy, adjustable dead-time control, undervoltage lockout, and an uncommitted output transistor rated to 200 mA source or sink, which is what makes it a natural fit for single-ended SWITCHMODE supplies where one switch does the work. The part in the photos is marked MC34060AP by Motorola, and the drafting here follows that marking. Electrical limits beyond the feature summary below, including supply voltage range and oscillator frequency range, are not confirmed here - verify against the MC34060A datasheet before use.
Key Features
- Marked MC34060AP with the Motorola M logo; second line on the photographed piece reads KEX9449
- Complete pulse width modulation control circuitry in a single 14-pin plastic DIP
- On-chip oscillator with master or slave operation
- On-chip error amplifiers
- On-chip 5.0 V reference, 1.5 percent accuracy
- Adjustable dead-time control
- Uncommitted output transistor rated to 200 mA source or sink
- Undervoltage lockout
- Through-hole DIP-14 body, standard 0.1 inch pin pitch on 0.3 inch row spacing
- Supply range, switching frequency limits and other electrical parameters are not confirmed - verify against the datasheet before use
Applications
- A repair tech chasing a dead bench power supply that has an MC34060A in the control section and wants the original Motorola part rather than a substitution that changes the loop behavior
- A restorer bringing 1990s test gear or industrial equipment back to life who needs the marked part number to match the schematic and the board silkscreen
- A designer breadboarding a single-ended forward or flyback control section, where a socketed through-hole DIP makes swapping parts during the first prototype revision painless
- An instructor or lab building a teaching rig around a classic PWM controller, using the dead-time control pin to show students what happens when the off time changes
Frequently Asked Questions
What exactly is marked on the part?
The Motorola M logo, then MC34060AP on the first line, then KEX9449 on the second line. The first line is the part number we are selling to. The second line is a factory code line, not a part number, and it is not a spec you should design around.
What package is this, and will it drop into a DIP socket?
It is the through-hole 14-pin plastic DIP, photographed against a millimeter scale so you can judge the body size for yourself. It uses the standard DIP-14 geometry of 0.1 inch between pins and 0.3 inch between rows, which is what a common 14-pin socket or a 14-pin through-hole footprint expects.
Will the pieces I order carry the same second-line code as the one in the photos?
Not necessarily. Stock here is more than one and the photographed piece is representative of the group, so the MC34060AP part number line is the constant and the code line underneath it can differ between pieces.
What is not confirmed in this listing?
The feature list above comes from the MC34060A device description and the marking on the part. Anything beyond it - supply voltage range, oscillator frequency range, timing and switching parameters - is not confirmed here, so verify against the MC34060A datasheet before use.
Why buy two or three of these here instead of a bag of fifty somewhere else?
Because a PWM controller is a part you count out, not a part you stockpile. One for the repair, one for the spare drawer, three if the prototype is going to get abused, and you are done - no minimum lot, no fifty-piece bag of a part you will use twice in a decade. These are sold each out of a small stock of unused Motorola pieces with the part number plainly legible in the photos, so you know which part number you are buying before you order. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Motorola put the whole decision-making half of a switching supply into fourteen pins, then let it spend a couple of decades quietly setting the off time in other people's power rails. If you are rebuilding a supply that expects an MC34060A, this one is ready to start counting dead time again.
