LM199AH Equivalent & Substitute Parts

Part Overview

The LM199AH is a shunt voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 6.95V output with ±2.16% tolerance. This component operates as a precision voltage reference in power management applications and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain the same output voltage, package type, and core electrical characteristics while offering improved performance specifications.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	6.95V
Current - Output	10 mA
Tolerance	±2.16%
Temperature Coefficient	10ppm/°C
Noise - 10Hz to 10kHz	7µVrms
Current - Cathode	500 µA
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	TO-46-4 Metal Can
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the LM199AH is determined by the following critical parameters:

Output Voltage: Must be 6.95V fixed
Package Type: Must be TO-46-4 Metal Can
Reference Type: Must be Shunt
Current - Output: Must be 10 mA
Current - Cathode: Must be 500 µA
Mounting Type: Must be Through Hole

All substitute parts listed maintain these core electrical and mechanical specifications. Substitute parts from the LM399 series (Analog Devices Inc.) meet these requirements while offering superior tolerance and temperature coefficient performance. Packaging variants (with or without #PBF suffix, Bag or Bulk packaging) represent the same electrical component in different distribution formats.

Parameter Comparison

Parameter	LM199AH	LM399AH	LM399AH#PBF	LM399H	LM399H#PBF
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Output (Min/Fixed)	6.95V	6.95V	6.95V	6.95V	6.95V
Current - Output	10 mA	10 mA	10 mA	10 mA	10 mA
Tolerance	±2.16%	±0.17%	±0.17%	±0.17%	±0.17%
Temperature Coefficient	10ppm/°C	1ppm/°C	1ppm/°C	2ppm/°C	2ppm/°C
Noise - 10Hz to 10kHz	7µVrms	7µVrms	7µVrms	7µVrms	7µVrms
Current - Cathode	500 µA	500 µA	500 µA	500 µA	500 µA
Operating Temperature	-55°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	TO-46-4 Metal Can	TO-46-4 Metal Can	TO-46-4 Metal Can	TO-46-4 Metal Can	TO-46-4 Metal Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All LM399 series variants (LM399AH, LM399AH#PBF, LM399H, LM399H#PBF) are direct electrical substitutes for the obsolete LM199AH. Selection among these variants depends on procurement and application requirements:

LM399AH and LM399H are suitable for applications where standard packaging is acceptable. LM399AH#PBF and LM399H#PBF are specified when lead-free solder compatibility is required. The #PBF designation indicates compliance with RoHS lead-free requirements.

LM399AH variants feature a 1ppm/°C temperature coefficient, providing superior temperature stability. LM399H variants feature a 2ppm/°C temperature coefficient. Both meet the core substitution criteria.

All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original LM199AH. Operating temperature range for substitute parts is 0°C ~ 70°C, which is narrower than the original part's -55°C ~ 125°C range. Applications requiring extended temperature operation below 0°C or above 70°C must evaluate this limitation against system requirements.

Frequently Asked Questions (FAQ)

Q: Can LM399AH directly replace LM199AH in existing designs?

A: Yes. Both parts share identical output voltage (6.95V), output current (10 mA), cathode current (500 µA), and TO-46-4 Metal Can package. Electrical substitution is direct. However, verify that the operating temperature range of 0°C ~ 70°C for the LM399 series meets your application requirements, as the original LM199AH operates from -55°C ~ 125°C.

Q: What is the difference between LM399AH and LM399H?

A: Both parts are electrically equivalent with identical output voltage, current ratings, and package type. The primary difference is temperature coefficient: LM399AH features 1ppm/°C while LM399H features 2ppm/°C. For applications requiring maximum temperature stability, LM399AH is preferred.

Q: What does the #PBF suffix indicate?

A: The #PBF suffix indicates lead-free (Pb-free) solder compatibility and RoHS compliance. LM399AH#PBF and LM399H#PBF are identical to their non-suffixed counterparts electrically but are specified for lead-free assembly processes. Select #PBF variants when your manufacturing process requires lead-free components.

Q: Are packaging variants (Bag vs. Bulk) electrically different?

A: No. Packaging variants represent distribution format only. LM399AH#PBF (Bag) and LM399H#PBF (Bulk) are electrically identical to their non-packaged counterparts. Selection depends on procurement quantity and handling requirements.

Q: What is the tolerance improvement when substituting to LM399 series?

A: The LM199AH specifies ±2.16% tolerance. All LM399 series substitutes specify ±0.17% tolerance, representing a 12.7x improvement in output voltage accuracy. This enhanced tolerance may improve system performance in precision applications.

Q: Can I use LM399 series in applications with operating temperatures below 0°C or above 70°C?

A: The LM399 series is specified for 0°C ~ 70°C operation. Applications requiring extended temperature operation must evaluate whether operation outside this range is acceptable for their specific use case. The original LM199AH supports -55°C ~ 125°C.

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