Rev 2.1 ©2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286

www.aldinc.com

SCL, PCL PACKAGES

SAL, PAL PACKAGES

PIN CONFIGURATIONS

*IC pins are internally connected,

connect to V-

TM

®

N

A

B

L

E

D

E

ALD114804/ALD114804A/ALD114904/ALD114904A

GENERAL DESCRIPTION

ALD114804/ALD114804A/ALD114904/ALD114904A are high precision monolithic

quad/dual depletion mode N-Channel MOSFETS matched at the factory using

ALD’s proven EPAD® CMOS technology. These devices are intended for low

voltage, small signal applications. They are excellent functional replacements for

normally-closed relay applications, as they are normally on (conducting) without

any power applied, but could be turned off or modulated when system power

supply is turned on. These MOSFETS have the unique characteristics of, when

the gate is grounded, operating in the resistance mode for low drain voltage lev-

els and in the current source mode for higher voltage levels and providing a

constant drain current.

ALD114804/ALD114804A/ALD114904/ALD114904A MOSFETS are designed for

exceptional device electrical characteristics matching. As these devices are on

the same monolithic chip, they also exhibit excellent temperature tracking char-

acteristics. They are versatile as design components for a broad range of analog

applications, such as basic building blocks for current sources, differential ampli-

fier input stages, transmission gates, and multiplexer applications.

Besides matched pair electrical characteristics, each individual MOSFET also

exhibits well controlled parameters, enabling the user to depend on tight design

limits corresponding to well matched characteristics.

These depletion mode devices are built for minimum offset voltage and differen-

tial thermal response, and they are suitable for switching and amplifying applica-

tions in single supply (0.4V to + 5V ) or dual supply (+/- 0.4V to +/-5V) systems

where low input bias current, low input capacitance and fast switching speed are

desired. These devices exhibit well controlled turn-off and sub-threshold

charactersitics and therefore can be used in designs that depend on sub-thresh-

old characteristics.

The ALD114804/ALD114804A/ALD114904/ALD114904A are suitable for use in

precision applications which require very high current gain, beta, such as current

mirrors and current sources. A sample calculation of the DC current gain at a

drain current of 3mA and gate input leakage current of 30pA = 100,000,000. It is

recommended that the user, for most applications, connect the V+ pin to the

most positive voltage and the V- and IC pins to the most negative voltage in the

system. All other pins must have voltages within these voltage limits at all times.

• Depletion mode (normally ON)

• Precision Gate Threshold Voltages: -0.40V +/- 0.02V

• Matched MOSFET to MOSFET characteristics

• Tight lot to lot parametric control

• Low input capacitance

• High input impedance — 10

12

Ω typical

• DC current gain >10

8

• Low input and output leakage currents

FEATURES

APPLICATIONS

• Functional replacement of Form B (NC) relays

• Ultra low power (nanowatt) analog and digital

circuits

• Ultra low operating voltage (<0.2V) analog and

digital circuits

• Sub-threshold biased and operated circuits

• Zero power fail safe circuits in alarm systems

• Backup battery circuits

• Power failure and fail safe detector

• Source followers and high impedance buffers

• Precision current mirrors and current sources

• Capacitives probes and sensor interfaces

• Charge detectors and charge integrators

• Differential amplifier input stage

• High side switches

• Peak detectors and level shifters

• Sample and Hold

• Current multipliers

• Discrete analog switches and multiplexers

• Discrete voltage comparators

* Contact factory for industrial temp. range or user-specified threshold voltage values

Operating Temperature Range*

0

°C to +70°C0°C to +70°C

16-Pin

16-Pin

8-Pin

8-Pin

SOIC

Plastic Dip

SOIC

Plastic Dip

Package

Package

Package

Package

ALD114804ASCL ALD114804APCL ALD114904ASAL ALD114904APAL

ALD114804SCL

ALD114804PCL

ALD114904SAL

ALD114904PAL

VGS(th)= -0.40V

QUAD/DUAL N-CHANNEL DEPLETION MODE EPAD®

PRECISION MATCHED PAIR MOSFET ARRAY

ALD114804

ALD114904

IC*

1

2

3

14

15

16

4

13

5

12

IC*

6

7

8

10

11

IC*

IC*

9

M 4

M 3

M 1

M 2

V-

1

2

3

6

7

8

4

5

M 1

M 2

V-

V-

V-

IC*

IC*