1N755ATR Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N755ATR is a 7.5 V, 500 mW Zener diode manufactured by onsemi in a DO-35 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 1N755ATR serves as a voltage regulation and protection element in electronic circuits requiring precise 7.5 V reference voltage with moderate power dissipation capability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	7.5	V
Tolerance	±5%	-
Power - Maximum	500	mW
Impedance (Maximum)	6	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 1 V	-
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	-
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N755ATR is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 7.5 V
Tolerance: ±5%
Power - Maximum: 500 mW or greater
Impedance (Maximum): 6 Ohms or lower
Mounting Type: Through Hole
Package / Case: DO-35 or equivalent axial package

Substitute parts are grouped into two categories:

Direct Equivalents (500 mW, DO-35 Package): Parts with identical zener voltage, tolerance, power rating, and package form factor. These provide pin-for-pin and functional compatibility.

Parametric Equivalents (Higher Power Rating): Parts with identical zener voltage and tolerance but higher power dissipation capability (1 W, 2 W, or 3 W). These are suitable for applications requiring greater thermal headroom or higher current handling. Package form may differ (DO-41 or axial).

Partial Equivalents (Lower Power Rating): Parts with identical zener voltage and tolerance but lower power dissipation (125 mW). These are suitable only for applications with reduced power requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status
1N755ATR	onsemi	7.5	±5%	500	6	DO-35	Obsolete
1N5236B	Microchip Technology	7.5	±5%	500	6	DO-35	Active
1N5236BTR	Fairchild Semiconductor	7.5	±5%	500	6	DO-35	Active
1N5236B TR PBFREE	Central Semiconductor Corp	7.5	±5%	500	6	DO-35	Active
1N755A-1	Microchip Technology	7.5	±5%	500	4	DO-35	Active
1N4737A	Lumimax Optoelectronic Technology	7.5	±5%	1000	4	DO-41	Active
1N5064	Microchip Technology	7.5	±5%	3000	2	Axial	Active
1EZ7.5D5-TP	Micro Commercial Co	7.5	±5%	125	4	DO-41	Active
2EZ7.5D5-TP	Micro Commercial Co	7.5	±5%	2000	2	DO-41	Active
1N755	Microchip Technology	7.5	±10%	400	6	DO-35	Active

Engineering Selection Recommendations

Direct Replacement (Recommended for Pin-Compatible Applications):

1N5236B, 1N5236BTR, and 1N5236B TR PBFREE are direct functional equivalents with identical electrical specifications and DO-35 packaging. These parts are in active production status and provide the most straightforward replacement path. The 1N5236B TR PBFREE variant offers RoHS3 compliance, suitable for applications requiring lead-free construction.

Higher Power Capability Substitutes (For Thermal Margin Enhancement):

1N4737A (1 W, DO-41), 2EZ7.5D5-TP (2 W, DO-41), and 1N5064 (3 W, Axial) provide increased power dissipation capability while maintaining the 7.5 V zener voltage and ±5% tolerance. These parts are suitable for applications where thermal headroom or higher current handling is required. Package form change requires PCB layout modification.

Lower Power Substitute (For Reduced Power Applications Only):

1EZ7.5D5-TP (125 mW, DO-41) is suitable only for applications with power dissipation requirements below 500 mW. This part is not recommended as a general replacement due to reduced power capability.

Tolerance Consideration:

1N755 (Microchip Technology) offers the same package and power rating but with ±10% tolerance instead of ±5%. This part is suitable only for applications where ±10% zener voltage tolerance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can 1N5236B directly replace 1N755ATR without PCB modification?

A: Yes. The 1N5236B is a direct functional equivalent with identical zener voltage (7.5 V), tolerance (±5%), power rating (500 mW), impedance (6 Ohms), and DO-35 package. No PCB layout changes are required.

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

A: Both parts have identical electrical specifications and DO-35 packaging. The primary difference is manufacturer: 1N5236B is manufactured by Microchip Technology, while 1N5236BTR is manufactured by Fairchild Semiconductor. Both are active production parts suitable for direct substitution.

Q: Why would I select 1N4737A (1 W) over 1N5236B (500 mW)?

A: The 1N4737A provides double the power dissipation capability, offering greater thermal margin in applications with higher current demands or elevated ambient temperatures. However, the DO-41 package differs from the DO-35, requiring PCB layout modification.

Q: Is 1N5236B TR PBFREE suitable for RoHS-compliant applications?

A: Yes. The 1N5236B TR PBFREE variant is RoHS3 compliant and lead-free, meeting regulatory requirements for RoHS-restricted applications. It maintains identical electrical specifications to the standard 1N5236B.

Q: Can 1EZ7.5D5-TP (125 mW) be used in place of 1N755ATR (500 mW)?

A: Only if the application power dissipation requirement is confirmed to be below 125 mW. The 1EZ7.5D5-TP has insufficient power rating for applications designed for 500 mW operation and will experience thermal stress and potential failure.

Q: What is the operating temperature range difference between 1N755ATR and substitute parts?

A: The 1N755ATR operates from -65°C to 200°C. Most substitute parts (1N5236B, 1N5236BTR, 1N5236B TR PBFREE) maintain this range. However, 1N755A-1, 1N755, and 1EZ7.5D5-TP have reduced upper temperature limits (-65°C to 175°C or -55°C to 150°C), which may affect suitability in high-temperature applications.

Q: Are there compliance or certification differences between substitute parts?

A: Yes. 1N5236B TR PBFREE is RoHS3 compliant and lead-free. Standard 1N5236B and 1N5236BTR are RoHS non-compliant. All parts are REACH unaffected and classified as EAR99 for export control purposes.

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