KA431LZTF Equivalent & Substitute Parts

Part Overview

The KA431LZTF is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum output of 36V and supports 100 mA output current. The KA431LZTF is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across output voltage range, current capacity, and tolerance specifications while considering operating temperature ranges and product status.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA431LZTF
Manufacturer	onsemi
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-25°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the KA431LZTF is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output voltage range: 2.495V minimum to 36V maximum (exact match required)
Output current capacity: 100 mA (exact match required)
Cathode current: 1 mA (exact match required)
Temperature coefficient: 50ppm/°C Typical (exact match required)
Reference type: Shunt (exact match required)
Output type: Adjustable (exact match required)

Mechanical Compatibility Requirements:

Mounting type: Through Hole (exact match required)
Package / Case: TO-92-3 or TO-226-3 variants (exact match required)

Tolerance Consideration: The KA431LZTF specifies ±0.5% tolerance. Substitute parts with equal or tighter tolerance (±0.4%, ±1%) are functionally compatible, as tighter tolerances represent improved performance. Parts with looser tolerance (±2.2%) remain electrically compatible but represent reduced precision.

Operating Temperature Range: The KA431LZTF operates from -25°C to 85°C. Substitute parts with equal or wider temperature ranges are compatible. Parts with narrower ranges (0°C to 70°C) are compatible for applications within that subset.

Product Status: Active parts are preferred for new designs. Obsolete parts are acceptable for legacy system maintenance and replacement stock.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp Range	Package	Product Status
KA431LZTF	onsemi	2.495V / 36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Obsolete
TL431ACLPRAG	onsemi	2.495V / 36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	TO-92-3	Active
TL431AILPRAG	onsemi	2.495V / 36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL431AILPRPG	onsemi	2.495V / 36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Obsolete
TL431BCLPRAG	onsemi	2.495V / 36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	TO-92-3	Active
TL431BCLPRMG	onsemi	2.495V / 36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	TO-92-3	Obsolete
TL431BILPRAG	onsemi	2.495V / 36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL431BVLPRAG	onsemi	2.495V / 36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 125°C	TO-92	Obsolete
TL431CLPRAG	onsemi	2.495V / 36V	100 mA	±2.2%	50ppm/°C	0°C ~ 70°C	TO-92	Active
TL431CLPRPG	onsemi	2.495V / 36V	100 mA	±2.2%	50ppm/°C	0°C ~ 70°C	TO-92	Active
TL431ILPRAG	onsemi	2.495V / 36V	100 mA	±2.2%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

TL431BILPRAG is the optimal substitute for the KA431LZTF. This part maintains identical electrical specifications (2.495V to 36V output, 100 mA current, 50ppm/°C temperature coefficient) with improved tolerance (±0.4% versus ±0.5%), an extended operating temperature range (-40°C to 85°C), and active product status. The TO-92-3 package provides direct mechanical compatibility.

TL431AILPRAG serves as an alternative primary substitute with ±1% tolerance and active product status. It covers the full operating temperature range (-40°C to 85°C) and maintains all electrical specifications. This part is suitable for applications where the relaxed tolerance is acceptable.

Secondary Substitutes (Conditional Compatibility):

TL431BCLPRAG and TL431CLPRAG are active parts with full electrical compatibility but operate within a narrower temperature range (0°C to 70°C). These parts are suitable for applications that do not require extended low-temperature operation below 0°C or high-temperature operation above 70°C.

TL431BVLPRAG offers the widest operating temperature range (-40°C to 125°C) with improved tolerance (±0.4%), but uses a TO-92 package variant. Mechanical compatibility must be verified for specific PCB layouts.

Compliance Status:

All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. The KA431LZTF lacks explicit RoHS certification documentation.

Frequently Asked Questions (FAQ)

Q: Can TL431ACLPRAG replace KA431LZTF directly?

A: TL431ACLPRAG is electrically compatible but operates within a narrower temperature range (0°C to 70°C versus -25°C to 85°C). Direct substitution is valid only for applications operating within this narrower range. For full temperature coverage, TL431AILPRAG or TL431BILPRAG are preferred.

Q: What is the difference between TL431BILPRAG and TL431AILPRAG?

A: Both parts maintain identical electrical specifications and operating temperature range (-40°C to 85°C). The primary difference is tolerance: TL431BILPRAG specifies ±0.4% tolerance while TL431AILPRAG specifies ±1% tolerance. TL431BILPRAG provides superior precision for applications requiring tighter voltage regulation.

Q: Are TO-92 and TO-92-3 packages interchangeable?

A: TO-92 and TO-92-3 are mechanically similar through-hole packages with identical lead configurations. Both are compatible with standard TO-92 footprints. TL431BVLPRAG uses a TO-92 Long Body variant; physical dimensions should be verified against PCB layout constraints.

Q: Why is KA431LZTF obsolete?

A: The KA431LZTF is classified as obsolete by the manufacturer. Active alternatives from the TL431 family provide equivalent or superior performance with modern compliance certifications and ongoing production support.

Q: Can I use a part with ±2.2% tolerance instead of ±0.5%?

A: TL431CLPRAG and TL431ILPRAG with ±2.2% tolerance are electrically compatible and maintain all other specifications. Substitution is valid for applications where the relaxed tolerance does not compromise circuit performance. Voltage regulation circuits with feedback control typically tolerate this tolerance variance.

Q: Which substitute offers the best temperature performance?

A: TL431BVLPRAG provides the widest operating temperature range (-40°C to 125°C) with improved tolerance (±0.4%). However, this part is obsolete. For active parts, TL431BILPRAG and TL431AILPRAG both support -40°C to 85°C operation, matching or exceeding the KA431LZTF range.

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