TZX2V4A-TR Equivalent & Substitute Parts

Part Overview

The TZX2V4A-TR is a 2.4 V Zener diode rated at 500 mW, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates across the temperature range of -65°C to 175°C and meets AEC-Q101 automotive qualification standards. The part is currently active in production with 1135 units in stock inventory.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters: nominal Zener voltage (2.4 V), maximum power dissipation (500 mW), package type (DO-35/DO-204AH), and operating temperature range. Alternative sources ensure design flexibility, supply chain continuity, and cost optimization without compromising circuit performance.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Voltage - Zener (Nom)	2.4	V	Critical - must match for voltage regulation function
Power - Max	500	mW	Critical - determines thermal capability and circuit current limits
Package / Case	DO-204AH, DO-35, Axial	-	Critical - physical and electrical interface compatibility
Mounting Type	Through Hole	-	Critical - PCB assembly method compatibility
Operating Temperature	-65°C ~ 175°C	°C	Important - defines usable temperature envelope
Impedance (Max)	100	Ohms	Important - affects dynamic response and noise filtering
RoHS Status	ROHS3 Compliant	-	Regulatory - environmental and material compliance

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Mandatory Equivalence Criteria:

Nominal Zener voltage: 2.4 V (exact match required)
Maximum power rating: 500 mW (exact match required)
Package type: DO-35 or DO-204AH (mechanical and electrical interface compatibility)
Mounting type: Through Hole (assembly process compatibility)
RoHS3 compliance status (regulatory requirement)

Secondary Compatibility Parameters:

Operating temperature range: minimum -65°C, maximum ≥175°C
Impedance (Max): ≤100 Ohms (ensures equivalent dynamic performance)
Reverse leakage current: specified at defined voltage and temperature conditions

All four substitute parts meet the mandatory equivalence criteria. Variations in tolerance, impedance, and reverse leakage current are within acceptable engineering margins for Zener diode applications and do not preclude substitution.

Parameter Comparison

Parameter	TZX2V4A-TR (Main)	BZX79C2V4 (TSC)	BZX79C2V4-T50A (onsemi)	1N5221B (TSC)	NZX2V4A,133 (Nexperia)
Manufacturer	Vishay	Taiwan Semiconductor	onsemi	Taiwan Semiconductor	Nexperia USA Inc.
Voltage - Zener (Nom)	2.4 V	2.4 V	2.4 V	2.4 V	2.4 V
Tolerance	-	±5%	±5%	±5%	±4%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	100 Ohms	100 Ohms	30 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 500 mV	100 µA @ 1 V	100 µA @ 1 V	100 µA @ 1 V	50 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 200°C	-55°C ~ 200°C	-55°C ~ 175°C
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Inventory (Pcs)	1135	684	10377	2160	10836

Engineering Selection Recommendations

BZX79C2V4 (Taiwan Semiconductor Corporation)

This part maintains full electrical equivalence with the TZX2V4A-TR across all critical parameters. Operating temperature range (-65°C to 175°C) matches the main part exactly. Impedance specification (100 Ohms maximum) is identical. All regulatory certifications (ROHS3, REACH Unaffected, EAR99) align with the original part. Inventory availability is 684 units. Selection is appropriate for direct substitution in applications where the main part is unavailable.

BZX79C2V4-T50A (onsemi)

This part meets all mandatory substitution criteria with identical Zener voltage (2.4 V) and power rating (500 mW). The operating temperature range extends to 200°C, providing enhanced thermal margin beyond the -65°C to 175°C specification of the main part. Impedance (100 Ohms) and package type (DO-35) are equivalent. Inventory availability is 10377 units, the highest among all substitutes. Regulatory compliance (ROHS3, REACH Unaffected, EAR99) is confirmed. This part is suitable for applications requiring extended temperature operation or where supply continuity is prioritized.

1N5221B (Taiwan Semiconductor Corporation)

This part provides electrical equivalence in Zener voltage (2.4 V) and power rating (500 mW). The impedance specification (30 Ohms maximum) is lower than the main part (100 Ohms), resulting in improved dynamic response and reduced noise. Forward voltage (1.1 V @ 200 mA) is lower than the main part (1.5 V @ 200 mA), indicating superior forward conduction characteristics. Operating temperature range (-55°C to 200°C) exceeds the main part specification. All regulatory requirements are met. Inventory is 2160 units. Selection is appropriate when lower impedance or improved forward conduction characteristics provide circuit benefits.

NZX2V4A,133 (Nexperia USA Inc.)

This part maintains full electrical equivalence with Zener voltage (2.4 V) and power rating (500 mW). Tolerance specification (±4%) is tighter than other substitutes (±5%), providing improved voltage regulation accuracy. Impedance (100 Ohms) matches the main part. Reverse leakage current (50 µA @ 1 V) is lower than most substitutes, indicating superior reverse blocking characteristics. Operating temperature range (-55°C to 175°C) covers the main part specification. Inventory availability is 10836 units, the highest among all options. All regulatory certifications are confirmed. Selection is appropriate for applications requiring tighter voltage tolerance or lower reverse leakage performance.

Frequently Asked Questions (FAQ)

Q: Can I substitute the TZX2V4A-TR with any of these parts without circuit modification?

A: Yes. All four substitute parts maintain the critical electrical parameters: 2.4 V nominal Zener voltage, 500 mW maximum power dissipation, and DO-35 through-hole package. No circuit modifications are required for direct substitution. Differences in impedance, tolerance, and reverse leakage current are within acceptable engineering margins for standard Zener diode voltage regulation applications.

Q: What is the difference between the impedance specifications?

A: Impedance (Zzt) affects the dynamic response of the Zener diode to rapid changes in load current. The 1N5221B has a maximum impedance of 30 Ohms, compared to 100 Ohms for the other parts. Lower impedance results in faster transient response and reduced output voltage ripple. Selection of the 1N5221B is appropriate when circuit design requires superior high-frequency noise rejection or rapid load transient suppression.

Q: Why do some parts have different operating temperature ranges?

A: Operating temperature range defines the thermal envelope within which the part maintains specified electrical performance. The BZX79C2V4-T50A extends to 200°C, and the 1N5221B extends to 200°C, compared to 175°C for the main part. These extended ranges provide additional thermal margin in high-temperature applications. However, for applications operating within -65°C to 175°C, all parts are equivalent.

Q: What does the tolerance specification mean?

A: Tolerance indicates the allowable deviation of the nominal Zener voltage from the specified 2.4 V value. The NZX2V4A,133 has ±4% tolerance, while BZX79C2V4, BZX79C2V4-T50A, and 1N5221B have ±5% tolerance. Tighter tolerance (±4%) provides more precise voltage regulation. For applications requiring strict voltage accuracy, the NZX2V4A,133 is preferred.

Q: Are all these parts automotive-qualified?

A: The TZX2V4A-TR carries AEC-Q101 automotive qualification. The substitute parts do not list explicit AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, verify qualification status with the manufacturer before selection.

Q: What is the significance of the reverse leakage current specification?

A: Reverse leakage current indicates the small current that flows through the Zener diode when reverse-biased below the Zener voltage. Lower reverse leakage improves circuit efficiency and reduces power dissipation in standby conditions. The NZX2V4A,133 (50 µA @ 1 V) and TZX2V4A-TR (5 µA @ 500 mV) have lower reverse leakage than the other substitutes (100 µA @ 1 V). Selection of lower-leakage parts is appropriate for battery-powered or low-power applications.

Q: Can I use these parts interchangeably in existing PCB designs?

A: Yes. All parts use the DO-35 through-hole package with identical axial lead configuration and spacing. PCB footprints, lead hole diameters, and assembly processes are compatible. No PCB redesign is required for substitution.

Q: Which substitute part should I choose for maximum inventory availability?

A: The NZX2V4A,133 has the highest inventory at 10836 units, followed by BZX79C2V4-T50A at 10377 units. Both parts provide excellent supply continuity and are suitable for high-volume production requirements.

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