1N4711-TP Zener Diode 27V 500mW Equivalent & Substitute Parts

Part Overview

The 1N4711-TP is a through-hole zener diode rated at 27 V nominal with 500 mW power dissipation in a DO-35 package. Manufactured by Micro Commercial Co, this part is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing production, maintenance, and new design implementations. Substitute parts maintain the core electrical specifications while offering improved availability and active product support from current manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±5%	-
Power - Max	500	mW
Current - Reverse Leakage @ Vr	10 nA @ 20.4 V	-
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	-
Operating Temperature	200	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N4711-TP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 27 V
Power - Max: 500 mW
Package / Case: DO-35 (DO-204AH)
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Tolerance: ±5% (primary part specification)
Operating Temperature Range: Minimum -65°C to 175°C or higher
Voltage - Forward (Vf) characteristics
Current - Reverse Leakage specifications

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Tolerance ±5%):

1N4711 TR PBFREE (Central Semiconductor Corp)
BZX55C27-TAP (Vishay)
BZX55C27-TR (Vishay)

Enhanced Alternatives (Tighter Tolerance ±2%):

1N5254B TR PBFREE (Central Semiconductor Corp)
1N5254C-TAP (Vishay)
1N5254C-TR (Vishay)
BZX55B27-TAP (Vishay)
BZX55B27-TR (Vishay)

Premium Alternatives (Automotive Grade, AEC-Q101):

TZX27A-TAP (Vishay)
TZX27A-TR (Vishay)

All substitute parts maintain the 27 V zener voltage, 500 mW power rating, DO-35 package configuration, and through-hole mounting type. Differences exist in tolerance specifications, impedance characteristics, reverse leakage current, and operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Vf (Max) @ If	Operating Temp	Product Status	Packaging	Grade
1N4711-TP	Micro Commercial Co	27 V	±5%	500 mW	1.5 V @ 100 mA	200°C (TJ)	Obsolete	DO-35	-
1N4711 TR PBFREE	Central Semiconductor Corp	27 V	±5%	500 mW	1.5 V @ 100 mA	-65°C ~ 200°C	Active	DO-35 (TR)	-
1N5254B TR PBFREE	Central Semiconductor Corp	27 V	±5%	500 mW	1.1 V @ 200 mA	-65°C ~ 200°C	Active	DO-35 (CT)	-
1N5254C-TAP	Vishay General Semiconductor	27 V	±2%	500 mW	1.1 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (TB)	Automotive
1N5254C-TR	Vishay General Semiconductor	27 V	±2%	500 mW	1.1 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (TR)	Automotive
BZX55B27-TAP	Vishay General Semiconductor	27 V	±2%	500 mW	1.5 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (CT)	Automotive
BZX55B27-TR	Vishay General Semiconductor	27 V	±2%	500 mW	1.5 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (CT)	Automotive
BZX55C27-TAP	Vishay General Semiconductor	27 V	±5%	500 mW	1.5 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (CT)	Automotive
BZX55C27-TR	Vishay General Semiconductor	27 V	±5%	500 mW	1.5 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (TR)	Automotive
TZX27A-TAP	Vishay General Semiconductor	27 V	-	500 mW	1.5 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (CT)	Automotive
TZX27A-TR	Vishay General Semiconductor	27 V	-	500 mW	1.5 V @ 200 mA	-65°C ~ 175°C	Active	DO-35 (CT)	Automotive

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Mitigation):

The 1N4711 TR PBFREE from Central Semiconductor Corp provides the most direct substitution. This part maintains identical electrical specifications (27 V, ±5% tolerance, 500 mW) and forward voltage characteristics while offering active product status and extended operating temperature range (-65°C to 200°C). This part is suitable for applications requiring minimal design changes.

For Enhanced Tolerance Applications:

The 1N5254C-TR and 1N5254C-TAP from Vishay offer tighter tolerance (±2%) with automotive-grade qualification (AEC-Q101). These parts are appropriate for applications requiring improved voltage accuracy. Both maintain the 27 V nominal voltage and 500 mW power rating with active product status.

For Automotive and High-Reliability Applications:

The BZX55B27-TR and BZX55B27-TAP from Vishay provide automotive-grade qualification with ±2% tolerance and AEC-Q101 certification. These parts are suitable for automotive and industrial applications requiring enhanced reliability standards.

For Standard Tolerance with Automotive Grade:

The BZX55C27-TAP and BZX55C27-TR maintain the ±5% tolerance specification matching the original part while providing automotive-grade qualification and active product status.

For Premium Performance:

The TZX27A-TAP and TZX27A-TR from Vishay offer automotive-grade qualification with superior reverse leakage characteristics (1 µA @ 21 V) and are suitable for applications requiring enhanced performance specifications.

All recommended substitutes are ROHS3 compliant and maintain the DO-35 through-hole package configuration. Selection should be based on application requirements for tolerance, operating temperature range, and automotive qualification needs.

Frequently Asked Questions (FAQ)

Q: Can the 1N4711-TP be directly replaced with any of the listed substitutes?

A: Yes, all listed substitutes maintain the core electrical specifications of 27 V nominal zener voltage, 500 mW power dissipation, and DO-35 package configuration. The 1N4711 TR PBFREE from Central Semiconductor Corp provides the most direct replacement with identical tolerance (±5%) and forward voltage characteristics.

Q: What is the difference between the ±5% and ±2% tolerance parts?

A: Tolerance specifies the allowable deviation from the nominal 27 V zener voltage. The ±5% tolerance parts (1N4711-TP, 1N4711 TR PBFREE, BZX55C27 series) allow voltage variation between 25.65 V and 28.35 V. The ±2% tolerance parts (1N5254C series, BZX55B27 series) restrict variation to 26.46 V and 27.54 V, providing tighter voltage regulation for precision applications.

Q: Are the automotive-grade parts (BZX55, TZX27) suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification meet or exceed standard industrial reliability requirements. These parts are suitable for any application and offer enhanced reliability margins.

Q: What is the significance of the packaging designations (TR, CT, TB)?

A: TR (Tape & Reel) is standard for high-volume automated assembly. CT (Cut Tape) is suitable for lower-volume or mixed-component applications. TB (Tape & Box) combines tape packaging with box quantities. All three packaging types contain identical electronic components; the difference is in delivery and handling format.

Q: Can I use parts with different forward voltage (Vf) specifications?

A: Forward voltage differences are minor (1.1 V to 1.5 V at specified currents) and do not affect zener diode operation in typical voltage regulation circuits. However, in applications where forward conduction characteristics are critical, verify that the substitute part's Vf specification is acceptable for your circuit design.

Q: What is the impact of operating temperature range differences?

A: The original 1N4711-TP specifies 200°C maximum junction temperature. All substitute parts specify -65°C to 175°C or -65°C to 200°C operating ranges. For applications operating near maximum temperature limits, verify that the substitute part's temperature range meets your requirements.

Q: Why do some parts list no tolerance specification?

A: The TZX27A series does not specify tolerance in the provided data. Contact the manufacturer for complete tolerance specifications before selection for precision applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and suitable for applications requiring RoHS compliance.

Q: What is the difference between reverse leakage current specifications?

A: Reverse leakage current (specified at different voltage and temperature conditions across parts) indicates the quality of the diode junction. Lower leakage current (1 µA in TZX27A series) indicates superior junction quality compared to higher leakage specifications (10 nA to 100 µA in other series). For most applications, these differences are negligible; however, precision analog circuits may benefit from lower leakage specifications.

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