TZX7V5B-TAP Equivalent & Substitute Parts

Part Overview

The TZX7V5B-TAP is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 7.5 V nominal with 500 mW power dissipation capability. This through-hole component operates in the DO-35 (DO-204AH) package and is qualified to AEC-Q101 automotive standards. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical parameters and mechanical compatibility are maintained across the specified operating range.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	7.5	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	15	Ohms
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature	175	°C

Substitute Part Grouping Explanation

Substitution of the TZX7V5B-TAP is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 7.5 V
Tolerance: ±5%
Power - Max: 500 mW
Mounting Type: Through Hole
Package / Case: DO-35 (DO-204AH) Axial

Secondary Compatibility Factors:

Impedance (Max): 15 Ohms or lower
Current - Reverse Leakage: Specified at rated voltage
Voltage - Forward (Vf): Maximum ratings at specified current
Operating Temperature Range: Must support application requirements
Product Status: Active

All identified substitute parts maintain the core electrical specifications (7.5 V, 500 mW, ±5% tolerance) and through-hole DO-35 package configuration. Variations in impedance, reverse leakage, and forward voltage are documented to enable precise circuit-level compatibility assessment.

Parameter Comparison

Parameter	TZX7V5B-TAP (Main)	BZX79C7V5-T50A	1N5236B TR PBFREE	1N5236BTR	1N755A TR PBFREE
Manufacturer	Vishay General Semiconductor	Fairchild Semiconductor	Central Semiconductor Corp	Fairchild Semiconductor	Central Semiconductor Corp
Voltage - Zener (Nom)	7.5 V	7.5 V	7.5 V	7.5 V	7.5 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	15 Ohms	15 Ohms	6 Ohms	6 Ohms	6 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 5 V	1 µA @ 5 V	3 µA @ 6 V	3 µA @ 6 V	100 nA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 100 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	—	ROHS3 Compliant

Engineering Selection Recommendations

BZX79C7V5-T50A (Fairchild Semiconductor)

This substitute maintains identical electrical specifications to the main part: 7.5 V nominal voltage, ±5% tolerance, 500 mW power rating, and 15 Ohms maximum impedance. The operating temperature range extends to -65°C to 200°C, providing broader environmental coverage than the main part. Product status is active. This part is suitable for applications where the extended temperature range is beneficial and impedance matching is critical.

1N5236B TR PBFREE (Central Semiconductor Corp)

This substitute provides equivalent core specifications with reduced impedance (6 Ohms maximum) and improved forward voltage characteristics (1.1 V @ 200 mA). Operating temperature range is -65°C to 200°C. RoHS3 compliance is confirmed. The lower impedance may provide superior voltage regulation in certain circuit topologies. Product status is active with 10,847 units in stock.

1N5236BTR (Fairchild Semiconductor)

This substitute offers equivalent electrical performance with 6 Ohms maximum impedance and 1.2 V forward voltage @ 200 mA. Operating temperature range is -65°C to 200°C. Product status is active. This part is functionally interchangeable with 1N5236B TR PBFREE with minor forward voltage variation.

1N755A TR PBFREE (Central Semiconductor Corp)

This substitute maintains 7.5 V nominal voltage and 500 mW power rating with 6 Ohms maximum impedance. Reverse leakage is specified at 100 nA @ 1 V, representing superior leakage performance. Operating temperature range is -65°C to 200°C. RoHS3 compliance is confirmed. Product status is active with 5,034 units in stock.

All substitute parts are active products with confirmed availability and maintain the through-hole DO-35 package configuration required for direct mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can BZX79C7V5-T50A replace TZX7V5B-TAP in automotive applications?

A: BZX79C7V5-T50A maintains identical electrical specifications (7.5 V, 500 mW, ±5%) and through-hole DO-35 package compatibility. However, the main part carries AEC-Q101 automotive qualification while BZX79C7V5-T50A does not list this certification. Substitution in automotive applications requires verification of qualification requirements for the specific application.

Q: What is the difference between 1N5236B TR PBFREE and 1N5236BTR?

A: Both parts share identical core specifications (7.5 V, 500 mW, ±5%, 6 Ohms impedance) and operating temperature range (-65°C to 200°C). The primary difference is forward voltage: 1N5236B TR PBFREE is rated at 1.1 V @ 200 mA while 1N5236BTR is rated at 1.2 V @ 200 mA. Both are functionally equivalent for standard zener diode applications.

Q: Why does 1N755A TR PBFREE show lower reverse leakage than other substitutes?

A: 1N755A TR PBFREE specifies reverse leakage at 100 nA @ 1 V, compared to 1 µA @ 5 V for the main part and 3 µA @ 6 V for other substitutes. Reverse leakage is measured at different voltage points, making direct comparison dependent on the specific measurement conditions. The lower absolute value at 1 V indicates superior leakage performance at lower bias voltages.

Q: Are all substitute parts RoHS3 compliant?

A: RoHS3 compliance is confirmed for 1N5236B TR PBFREE and 1N755A TR PBFREE. BZX79C7V5-T50A and 1N5236BTR do not list RoHS status in the provided specifications. Compliance verification is required for applications with RoHS requirements.

Q: Can these parts be used interchangeably in existing PCB designs?

A: All substitute parts use the through-hole DO-35 (DO-204AH) axial package with identical pin configuration. Direct mechanical substitution on existing PCBs is supported. Electrical interchangeability depends on circuit tolerance to variations in impedance (6 to 15 Ohms), forward voltage (1.1 to 1.5 V @ 200 mA), and reverse leakage characteristics.

Q: What is the significance of impedance variation between parts?

A: Impedance (Zzt) affects voltage regulation quality under dynamic load conditions. The main part and BZX79C7V5-T50A specify 15 Ohms maximum impedance, while substitute parts 1N5236B TR PBFREE, 1N5236BTR, and 1N755A TR PBFREE specify 6 Ohms maximum. Lower impedance provides superior transient response and voltage stability. Circuit design determines whether impedance variation is acceptable.

Q: Is the extended operating temperature range of substitute parts significant?

A: The main part operates to 175°C maximum, while all substitute parts operate to 200°C maximum. The extended upper temperature limit provides additional thermal margin in high-temperature environments. Applications operating below 175°C are unaffected by this difference.

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