TZX27X-TAP Equivalent & Substitute Parts

Part Overview

The TZX27X-TAP is a 27 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 through-hole packaging. This component is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained while addressing supply availability, packaging preferences, or operational requirement variations.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Voltage - Zener (Nom)	27	V	Critical - Primary functional specification
Power - Max	500	mW	Critical - Thermal and current handling capacity
Impedance (Max)	80	Ohms	Important - Affects voltage regulation characteristics
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	V @ mA	Important - Forward conduction behavior
Operating Temperature Range	-65°C to 175°C	°C	Important - Environmental operating limits
Mounting Type	Through Hole	—	Critical - PCB assembly compatibility
Package / Case	DO-204AH, DO-35, Axial	—	Critical - Physical and electrical interface
RoHS Status	ROHS3 Compliant	—	Important - Regulatory compliance
Grade	Automotive	—	Important - Application qualification level

Substitute Part Grouping Explanation

Substitution of the TZX27X-TAP is permissible when the replacement component satisfies the following criteria:

Electrical Equivalence Requirements:

Zener voltage within the tolerance band of the original specification (27 V nominal)
Maximum power dissipation equal to or greater than 500 mW
Impedance (Zzt) at or below 80 Ohms maximum
Forward voltage characteristics compatible with 1.5 V @ 200 mA specification
Reverse leakage current within acceptable limits for the application

Mechanical Compatibility Requirements:

Through-hole mounting type
DO-35 (DO-204AH) axial package configuration
Identical lead spacing and physical dimensions

Regulatory and Compliance Requirements:

RoHS3 compliance status
Automotive-grade qualification or equivalent
Active product status

Environmental Requirements:

Operating temperature range encompassing or matching -65°C to 175°C

The NZX27X,133 substitute part meets all substitution criteria through equivalent electrical performance, identical mechanical packaging, matching regulatory compliance, and active product status.

Parameter Comparison

Parameter	TZX27X-TAP (Main)	NZX27X,133 (Substitute)	Compatibility
Manufacturer	Vishay General Semiconductor - Diodes Division	Nexperia USA Inc.	Different manufacturer, equivalent specification
Voltage - Zener (Nom)	27 V	27.69 V	Within acceptable tolerance band
Tolerance	—	±2%	Substitute provides specified tolerance
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	80 Ohms	80 Ohms	Equivalent
Current - Reverse Leakage @ Vr	1 µA @ 21 V	50 nA @ 18.9 V	Substitute exhibits lower leakage
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Equivalent
Operating Temperature	-65°C to 175°C	-55°C to 175°C	Substitute range is subset of original
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Packaging Type	Tape & Box (TB)	Cut Tape (CT)	Different packaging format, same component

Engineering Selection Recommendations

Primary Substitute: NZX27X,133

The NZX27X,133 manufactured by Nexperia USA Inc. is the qualified equivalent substitute for the TZX27X-TAP. Selection of this substitute is supported by the following engineering factors:

Electrical Performance: The NZX27X,133 maintains identical maximum power dissipation (500 mW) and impedance specifications (80 Ohms maximum). The nominal Zener voltage of 27.69 V represents a 2.6% deviation from the 27 V specification, which falls within standard Zener diode tolerance bands for this voltage class. Forward voltage characteristics are identical at 1.5 V @ 200 mA. The substitute exhibits superior reverse leakage performance (50 nA @ 18.9 V versus 1 µA @ 21 V), which provides enhanced voltage regulation stability.

Mechanical Compatibility: Both components utilize identical DO-35 (DO-204AH) axial through-hole packaging, ensuring direct PCB footprint compatibility without layout modification.

Regulatory Compliance: The NZX27X,133 maintains ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original component. Both components are classified as Active product status.

Operational Limitations: The substitute component specifies an operating temperature range of -55°C to 175°C, which represents a narrower lower temperature bound compared to the original -65°C to 175°C specification. Applications requiring operation below -55°C must retain the TZX27X-TAP.

Packaging Consideration: The substitute is supplied in Cut Tape (CT) packaging format, whereas the original is supplied in Tape & Box (TB) format. This distinction affects only procurement and handling logistics, not component functionality or performance.

Frequently Asked Questions (FAQ)

Q: Can the NZX27X,133 be used as a direct replacement for the TZX27X-TAP in all applications?

A: The NZX27X,133 is electrically and mechanically compatible with the TZX27X-TAP for applications operating within the temperature range of -55°C to 175°C. Applications requiring operation below -55°C must use the original TZX27X-TAP component.

Q: What is the significance of the 27.69 V nominal Zener voltage on the substitute compared to 27 V on the original?

A: The 27.69 V specification on the NZX27X,133 represents a 2.6% deviation from the 27 V nominal value. This variation is within the standard tolerance band for Zener diodes in this voltage class and does not compromise functional equivalence for typical circuit applications.

Q: Are there differences in reverse leakage current between the two components?

A: The NZX27X,133 exhibits lower reverse leakage current (50 nA @ 18.9 V) compared to the TZX27X-TAP (1 µA @ 21 V). Lower leakage current improves voltage regulation performance and reduces standby power consumption in voltage reference applications.

Q: Do the different packaging formats (Tape & Box versus Cut Tape) affect component performance?

A: Packaging format differences affect only procurement, storage, and assembly logistics. The electrical and mechanical performance of the component itself remains unchanged. Both packaging formats deliver the same component specification.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: (1) Zener voltage within acceptable tolerance of 27 V nominal, (2) maximum power dissipation of 500 mW or greater, (3) impedance at or below 80 Ohms, (4) identical DO-35 through-hole package configuration, (5) RoHS3 compliance, and (6) operating temperature range compatibility with the application requirement.

Q: Can the TZX27X-TAP be substituted with other 27 V Zener diodes not listed in this document?

A: Substitution with unlisted components requires independent verification that all electrical parameters (voltage, power, impedance, forward voltage), mechanical specifications (package type, mounting method), and regulatory compliance criteria match the requirements established in this reference. Only the NZX27X,133 is documented as a qualified equivalent substitute for the TZX27X-TAP.

Q: What compliance certifications apply to both the original and substitute components?

A: Both the TZX27X-TAP and NZX27X,133 are ROHS3 compliant, REACH unaffected, and classified as Active product status. The TZX27X-TAP carries AEC-Q101 automotive qualification. Compliance documentation should be obtained from the respective manufacturers for specific application requirements.

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