1N752ATR Equivalent & Substitute Parts

Part Overview

The 1N752ATR is a Zener diode manufactured by onsemi, rated at 5.6 V nominal with 500 mW power dissipation and ±5% tolerance. This component operates across a temperature range of -65°C to 200°C and is housed in a DO-35 (DO-204AH) axial through-hole package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts must maintain the same nominal Zener voltage, tolerance, power rating, and package configuration to ensure direct functional replacement.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N752ATR is determined by the following critical parameters:

Primary Substitution Criteria:

Nominal Zener voltage of 5.6 V
Tolerance of ±5%
Power dissipation rating of 500 mW
Package configuration: DO-35 (DO-204AH) axial through-hole
Operating temperature range compatibility

Secondary Compatibility Factors:

Impedance (Zzt) maximum: 11 Ohms
Reverse leakage current characteristics
Forward voltage characteristics
Manufacturer product status (active vs. obsolete)

Substitute parts are grouped into three categories based on their relationship to the main part:

Similar Equivalents – Parts with identical electrical specifications and DO-35 packaging
Parametric Equivalents – Parts meeting core electrical requirements with minor specification variations
Upgrade Options – Parts with enhanced specifications (higher power rating or improved impedance) in compatible packages

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Product Status	Temp Range
1N752ATR	onsemi	5.6 V	±5%	500 mW	11 Ω	DO-35	Obsolete	-65 to 200°C
1N5232B	Microchip Technology	5.6 V	±5%	500 mW	11 Ω	DO-35	Active	-65 to 175°C
1N5232BTR	Fairchild Semiconductor	5.6 V	±5%	500 mW	11 Ω	DO-35	Active	-65 to 200°C
1N752C	Microchip Technology	5.6 V	±2%	500 mW	11 Ω	DO-35	Active	-65 to 175°C
1N752A-1	Microchip Technology	5.6 V	±5%	500 mW	8 Ω	DO-35	Active	-65 to 175°C
1N752A TR PBFREE	Central Semiconductor Corp	5.6 V	±5%	500 mW	11 Ω	DO-35	Active	-65 to 200°C
1N5232B TR PBFREE	Central Semiconductor Corp	5.6 V	±5%	500 mW	11 Ω	DO-35	Active	-65 to 200°C
BZX79C5V6	Taiwan Semiconductor Corporation	5.6 V	±5%	500 mW	40 Ω	DO-35	Active	-65 to 175°C
1N4734A	Microsemi Corporation	5.6 V	±5%	1 W	5 Ω	DO-41	Active	-65 to 200°C
1EZ5.6D5-TP	Micro Commercial Co	5.6 V	±5%	1 W	5 Ω	DO-41	Active	-55 to 150°C
1N752	Microchip Technology	5.6 V	±10%	400 mW	11 Ω	DO-35	Active	-65 to 175°C

Engineering Selection Recommendations

Direct Replacement (DO-35 Package, 500 mW, ±5% Tolerance):

The following parts provide direct functional equivalence to the 1N752ATR with identical electrical specifications and package configuration:

1N5232B (Microchip Technology) – Active status, meets all core parameters. Operating temperature limited to -65°C to 175°C.
1N5232BTR (Fairchild Semiconductor) – Active status, full temperature range compatibility (-65°C to 200°C) matching the original part.
1N752A TR PBFREE (Central Semiconductor Corp) – Active status, full temperature range (-65°C to 200°C), RoHS3 compliant.
1N5232B TR PBFREE (Central Semiconductor Corp) – Active status, full temperature range (-65°C to 200°C), RoHS3 compliant.

Enhanced Specification Alternatives (DO-35 Package, 500 mW):

1N752C (Microchip Technology) – Tighter tolerance (±2%) provides improved voltage regulation accuracy. Operating temperature -65°C to 175°C.
1N752A-1 (Microchip Technology) – Lower impedance (8 Ω vs. 11 Ω) provides improved dynamic response. Operating temperature -65°C to 175°C.

Higher Power Rating Alternatives (1 W, ±5% Tolerance):

These parts accommodate higher power dissipation requirements but require package change from DO-35 to DO-41:

1N4734A (Microsemi Corporation) – 1 W power rating, DO-41 package, full temperature range (-65°C to 200°C).
1EZ5.6D5-TP (Micro Commercial Co) – 1 W power rating, DO-41 package. Operating temperature limited to -55°C to 150°C.

Lower Specification Alternative:

1N752 (Microchip Technology) – Reduced power rating (400 mW) and wider tolerance (±10%). Use only when circuit design permits relaxed specifications.

Compliance Considerations:

Parts designated "TR PBFREE" are RoHS3 compliant and lead-free. The BZX79C5V6 is also RoHS3 compliant. Selection of compliant parts is required for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can the 1N752ATR be replaced with any 5.6 V Zener diode?

A: No. Direct replacement requires matching the nominal voltage (5.6 V), tolerance (±5%), power rating (500 mW), and package type (DO-35). The 1N752ATR has specific impedance and temperature range characteristics that must be preserved for circuit performance.

Q: What is the difference between 1N5232B and 1N752A-1?

A: Both are 5.6 V, 500 mW, ±5% Zener diodes in DO-35 packages. The 1N752A-1 has lower impedance (8 Ω vs. 11 Ω), providing faster transient response. The 1N5232B maintains the original impedance specification. Selection depends on circuit transient response requirements.

Q: Can I use the 1N4734A (1 W) as a direct replacement?

A: The 1N4734A is electrically compatible (5.6 V, ±5%) but uses a different package (DO-41 instead of DO-35). Physical board layout changes are required. The higher power rating (1 W vs. 500 mW) is acceptable for applications requiring increased thermal margin but is not necessary for 500 mW designs.

Q: What does "TR PBFREE" designation mean?

A: "TR PBFREE" indicates the part is supplied in tape reel packaging and is lead-free (RoHS3 compliant). This designation affects packaging format and environmental compliance status but not electrical performance.

Q: Why is the operating temperature range different between substitute parts?

A: Different manufacturers specify different maximum junction temperatures. The 1N752ATR operates to 200°C, while some alternatives are rated to 175°C. For applications requiring full -65°C to 200°C operation, select parts explicitly rated to 200°C.

Q: Is the 1N752C with ±2% tolerance a direct replacement?

A: Yes, the 1N752C is a direct replacement with improved tolerance. The tighter ±2% specification provides better voltage regulation accuracy compared to the original ±5%. It is suitable for applications requiring more precise Zener voltage control.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects the Zener diode's dynamic response to load current changes. Lower impedance (8 Ω) provides faster voltage regulation response. Higher impedance (40 Ω) results in slower response. Selection depends on circuit bandwidth and transient requirements.

Q: Can the BZX79C5V6 be used as a substitute despite higher impedance?

A: The BZX79C5V6 meets the core electrical specifications (5.6 V, ±5%, 500 mW, DO-35) and is RoHS3 compliant. However, its impedance is 40 Ω compared to 11 Ω for the original part. Use only if circuit design tolerates slower transient response.

Q: Are there inventory considerations for part selection?

A: Yes. Inventory levels vary significantly. The 1N5232B (14,532 pcs), BZX79C5V6 (34,400 pcs), and 1N752A TR PBFREE (6,462 pcs) have substantial stock. Selection should consider both technical compatibility and supply availability for production continuity.

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