Features 0.6 mA to 15 mA operating current 0.8Ω dynamic impedance at any current Available with temperature coefficient of 0.01%/°C 7μV wideband noise 5% initial tolerance 0.002% long term stability Low cost Subsurface zener Description The LM329 is a precision multi-current temperature-compensated 6.9V zener reference with dynamic impedance a factor of 10 to 100 less than discrete diodes. Constructed in a single silicon chip, the LM329 uses active circuitry to buffer the internal zener allowing the device to operate over a 0.5 mA to 15 mA range with virtually no change in performance. The LM329 is available with a temperature coefficients of 0.01%/°C. This reference also has excellent long term stability and low noise. A new subsurface breakdown zener used in the LM329 gives lower noise and better long-term stability than conventional IC zeners. Further the zener and temperature compensating transistor are made by a planar process so they are immune to problems that plague ordinary zeners. For example, there is virtually no voltage shift in zener voltage due to temperature cycling and the device is insensitive to stress on the leads. The LM329 can be used in place of conventional zeners with improved performance. The low dynamic impedance simplifies biasing and the wide operating current allows the replacement of many zener types. The LM329 for operation over 0°C to 70°C is available in a TO-92 epoxy package.

Typical Application *click for larger image	Connection Diagram *click for larger image
Typical Performance click for larger image Reverse Voltage Characteristics

Datasheets

Title		Size	Date	Other Language
	LM329 Precision Reference	195 Kbytes	17-Jan-08

Application Notes

Title		Size	Date	Other Language
	AN-225: Application Note 225 IC Temperature Sensor Provides Thermocouple Cold-Junction Compensation	89 Kbytes	2-Oct-02
	AN-256: Application Note 256 Circuitry for Inexpensive Relative Humidity Measurement	119 Kbytes	2-Oct-02
	AN-263: Application Note 263 Sine Wave Generation Techniques	350 Kbytes	26-May-09
	AN-284: Application Note 284 Single-Supply Applications of CMOS MICRODACs	121 Kbytes	3-Oct-02
	AN-298: Application Note 298 Isolation Techniques for Signal Conditioning	379 Kbytes	2-Oct-02
	AN-299: Application Note 299 Audio Applications of Linear Integrated Circuits	232 Kbytes	2-May-04
	AN-301: Application Note 301 Signal Conditioning for Sophisticated Transducers	579 Kbytes	2-Oct-02
	AN-181: Application Note 181 3-Terminal Regulator is Adjustable	165 Kbytes	1-May-04
	AN-262: Application Note 262 Applying Dual and Quad FET Op Amps	416 Kbytes	2-Oct-02

Other Technical Documents

Title		Type	Date
	High Voltage Adjustable Power Supplies	App Note	2002-10-03

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM329DZ/NOPB RoHS Status	TO-92	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 7488 AVNET-EM Worldwide 591 DIGI-KEY Worldwide 3514 FARNELL Europe and Asia 395 MOUSER Worldwide 913 NEWARK Americas 395 TAYLOR Americas 7488	$0.35 each at 1K+ pcs	box of 1800

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM329AH	NONE	NONE	02 Sep 2003
LM329BH	NONE	NONE	02 Sep 2003
LM329BZ	NONE	NONE	02 Sep 2003
LM329CH	NONE	NONE	02 Sep 2003
LM329CZ	NONE	NONE	02 Sep 2003
LM329D MDC	NONE	NONE	02 Sep 2003
LM329D MWC	NONE	NONE	02 Sep 2003
LM329DH	NONE	NONE	02 Sep 2003

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM329.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM329 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM329DZ/NOPB	201.662 202.003	TO-92	3	1	NA	Detail	Download	N/A	NSXYTT LM329 DZ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM329.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM329 is located at RoHS Status.

CAD Symbols and Models Download LM329 CAD Symbols

Models N/A

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM329AH	NONE	NONE	02 Sep 2003
LM329BH	NONE	NONE	02 Sep 2003
LM329BZ	NONE	NONE	02 Sep 2003
LM329CH	NONE	NONE	02 Sep 2003
LM329CZ	NONE	NONE	02 Sep 2003
LM329D MDC	NONE	NONE	02 Sep 2003
LM329D MWC	NONE	NONE	02 Sep 2003
LM329DH	NONE	NONE	02 Sep 2003