APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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FEATURES

• LOW COST 200°C VERSION OF PA12

• OUTPUT CURRENT at 200°C — ±1A

• FULL SPECIFICATIONS — –25°C to +125°C

• WIDE SUPPLY RANGE — ±10 to ±45V

• CURRENT FOLDOVER PROTECTION

• EXCELLENT LINEARITY — Class A/B Output

APPLICATIONS

• MOTOR, VALVE AND ACTUATOR CONTROL

• POWER TRANSDUCERS UP TO 100kHz

• PROGRAMMABLE POWER SUPPLIES UP TO 80V

• TRANSMISSION LINE DRIVER

DESCRIPTION

The PA12H is a low cost, high temperature Power Op Amp

made especially for short term use in extreme environmental

situations such as down hole instrumentation. The amplifier can

power mechanical or electronic transducers and can drive the

long transmission lines associated with these applications.

The PA12H, based on the standard PA12’s very high

power level, leaves a six watt capability after being derated

for operation at a case temperature of 200°C. To meet the

high temperature requirements for up to 200 hours, polyimid

has replaced the standard epoxy for attaching the small signal

devices.

These hybrid integrated circuits utilize thick film conductors,

ceramic capacitors and silicon semiconductors to maximize

reliability, minimize size and give top performance. Ultrasoni-

cally bonded aluminum wires provide reliable interconnections

at all operating temperatures. The 8-pin TO-3 package (see

Package Outlines) is hermetically sealed and isolated. The use

of compressible thermal washers and/or improper mounting

torque will void the product warranty. Please see “General

Operating Considerations”.

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This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.

PA12HU REV H FEBRUARY 1998 © 1998 Apex Microtechnology Corp.

8-PIN TO-3

PACKAGE STYLE CE

SPECIFICATIONS

Specifications of the standard PA12 apply to the PA12H with

the exception of the temperature range extensions

1. The operating and storage temperature ABSOLUTE MAXI-

MUM RATINGS extend to +200°C.

2. Static and dynamic tests are performed at +125°C as shown

in SG 2 and SG 5 of the military PA12M data sheet.

3. Additional tests at T

A. Quiescent current = 100mA max at ±V

B. Voltage swing = ±V

GENERAL CONSIDERATIONS

The primary aim of the PA12H is to provide a reasonable

level of power output at a minimum cost. To achieve this end,

full dynamic tests are performed up to 125°C, with only minimal

100% testing at 200°C. This approach saves nearly an order

of magnitude over the cost of a fully tested long life product,

but does require recognition of two limitations.

First, input parameters such as voltage offset and bias cur-

rent are not tested above 125°C. This could lead to accuracy

problems if the PA12H is used as a precision computational

element. Solutions to this limitation include contacting the

factory regarding additional testing at higher temperatures or

using high temperature small signal amplifiers for computa-

tional tasks.

The second limitation of life span requires the PA12H to

be used in short term applications. This requirement is man-

dated by the low cost design concept. At 200°C component

degradation is nearly as severe during storage as during actual

operation. This must be taken into account when scheduling

actual implementation of the finished package.

Please consult the PA12 data sheet for basic information

on this amplifier; the PA12M data sheet for details on +125°C

tests, and Power Operational Amplifier handbook section

“General Operating Considerations,” for recommendations

on supplies, stability, heatsinks and bypassing.

EXTERNAL CONNECTIONS