1N750A_T50R Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N750A_T50R is a 4.7 V zener diode rated for 500 mW power dissipation in a DO-35 through-hole package, manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part features ±5% voltage tolerance and operates across a temperature range of -65°C to 200°C. Substitute parts must maintain electrical equivalence in zener voltage, power rating, and mechanical compatibility while meeting current product availability and compliance requirements.

Key Parameters

Parameter	1N750A_T50R
Voltage - Zener (Nom)	4.7 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	19 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 1N750A_T50R are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Zener voltage: 4.7 V nominal
Voltage tolerance: ±5%
Power rating: 500 mW
Package type: DO-35 (DO-204AH) through-hole axial configuration
Operating temperature range compatibility

Substitution Categories:

Parametric Equivalents maintain all critical electrical specifications and package requirements. These parts are direct functional replacements with identical or superior performance characteristics.

Similar Parts share the same zener voltage, power rating, and package but may have minor variations in secondary parameters such as impedance, reverse leakage current, or forward voltage characteristics. These variations remain within acceptable engineering tolerances for most applications.

Upgrade Parts offer improved specifications such as lower impedance, reduced reverse leakage, or extended temperature range while maintaining core electrical and mechanical compatibility.

Parts with different package types (such as DO-7) or tolerance specifications (±10% versus ±5%) are listed for reference but require design review before substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power - Max	Zzt (Max)	Vf (Max) @ If	Operating Temp	Package	Product Status
1N750A_T50R	onsemi	4.7 V	±5%	500 mW	19 Ohms	1.5 V @ 200 mA	-65°C ~ 200°C	DO-35	Obsolete
1N5230BTR	Fairchild Semiconductor	4.7 V	±5%	500 mW	19 Ohms	1.2 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N5230B	Microchip Technology	4.7 V	±5%	500 mW	19 Ohms	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
BZX79C4V7	Taiwan Semiconductor Corporation	4.7 V	±5%	500 mW	80 Ohms	1.5 V @ 100 mA	-65°C ~ 175°C	DO-35	Active
1N750A-1	Microchip Technology	4.7 V	±5%	500 mW	15 Ohms	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N750A TR PBFREE	Central Semiconductor Corp	4.7 V	±5%	500 mW	19 Ohms	1.5 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N5230B TR PBFREE	Central Semiconductor Corp	4.7 V	±5%	500 mW	19 Ohms	1.1 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
1N750	Microchip Technology	4.7 V	±10%	500 mW	19 Ohms	1.1 V @ 200 mA	-65°C ~ 175°C	DO-7	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

1N5230BTR (Fairchild Semiconductor) and 1N750A TR PBFREE (Central Semiconductor Corp) are the preferred substitutes. Both maintain identical zener voltage, tolerance, power rating, impedance, and operating temperature range as the original 1N750A_T50R. 1N5230BTR offers a lower forward voltage (1.2 V versus 1.5 V), which may reduce power dissipation in forward-biased applications. 1N750A TR PBFREE provides exact electrical equivalence with RoHS3 compliance and higher inventory availability (32,320 units).

Secondary Substitutes (Acceptable with Application Review):

1N5230B (Microchip Technology) and 1N5230B TR PBFREE (Central Semiconductor Corp) are functionally equivalent with identical electrical specifications. The operating temperature range is reduced to -65°C to 175°C, which is acceptable for most applications but excludes high-temperature environments above 175°C. 1N5230B TR PBFREE offers RoHS3 compliance and substantial inventory (9,462 units).

1N750A-1 (Microchip Technology) is an upgrade substitute with improved impedance (15 Ohms versus 19 Ohms) and reduced forward voltage (1.1 V versus 1.5 V), resulting in lower power dissipation. Operating temperature is limited to -65°C to 175°C. This part is suitable for applications requiring enhanced performance characteristics.

Alternative Substitute (Parameter Variation):

BZX79C4V7 (Taiwan Semiconductor Corporation) maintains core electrical specifications but exhibits higher impedance (80 Ohms versus 19 Ohms) and reduced forward current rating (100 mA versus 200 mA). This part is RoHS3 compliant and widely available (2,700 units). Substitution requires verification that the higher impedance does not degrade circuit performance in regulation or transient response applications.

Not Recommended for Direct Substitution:

1N750 (Microchip Technology) features a different package type (DO-7 versus DO-35) and relaxed voltage tolerance (±10% versus ±5%). This part is suitable only if the circuit design accommodates the wider tolerance and the DO-7 package footprint is compatible with the application.

Frequently Asked Questions (FAQ)

Q: Can 1N5230BTR be used as a direct replacement for 1N750A_T50R?

A: Yes. 1N5230BTR is a parametric equivalent with identical zener voltage (4.7 V), tolerance (±5%), power rating (500 mW), impedance (19 Ohms), and package type (DO-35). The forward voltage is lower (1.2 V versus 1.5 V), which reduces power dissipation in forward-biased operation. Operating temperature range is identical (-65°C to 200°C). This part is active and widely available.

Q: What is the difference between 1N750A TR PBFREE and 1N750A_T50R?

A: Both parts share identical electrical specifications: 4.7 V zener voltage, ±5% tolerance, 500 mW power rating, 19 Ohms impedance, and -65°C to 200°C operating range. The primary difference is product status: 1N750A_T50R is obsolete, while 1N750A TR PBFREE is active with RoHS3 compliance. The "PBFREE" designation indicates lead-free construction. Inventory availability is significantly higher for 1N750A TR PBFREE (32,320 units versus 741 units).

Q: Why does BZX79C4V7 have higher impedance than other substitutes?

A: BZX79C4V7 exhibits 80 Ohms maximum impedance compared to 19 Ohms for most alternatives. This is a characteristic of the BZX79 series design. Higher impedance affects voltage regulation performance, particularly under transient load conditions. Substitution with BZX79C4V7 requires circuit analysis to confirm that the impedance variation does not degrade regulation accuracy or transient response.

Q: Can 1N750A-1 replace 1N750A_T50R in all applications?

A: 1N750A-1 is an upgrade substitute with improved specifications: lower impedance (15 Ohms versus 19 Ohms) and reduced forward voltage (1.1 V versus 1.5 V). These improvements are beneficial for most applications. However, the operating temperature range is reduced to -65°C to 175°C. Substitution is acceptable for applications operating within this temperature range. Applications requiring operation above 175°C must use 1N5230BTR or 1N750A TR PBFREE.

Q: What does the DO-35 package designation mean?

A: DO-35 (also designated DO-204AH) is a through-hole axial package for small-signal diodes. The component has two leads extending from opposite ends of a cylindrical body. This package is suitable for manual insertion into through-hole PCB designs and is compatible with wave soldering processes. All recommended substitutes maintain the DO-35 package configuration except 1N750, which uses the DO-7 package.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. 1N750A_T50R and 1N5230B are RoHS non-compliant. BZX79C4V7, 1N750A TR PBFREE, and 1N5230B TR PBFREE are RoHS3 compliant. For applications subject to RoHS regulations or customer requirements, select from the RoHS3 compliant alternatives. 1N5230BTR and 1N750A-1 do not specify RoHS status in the provided data.

Q: What is the significance of ±5% versus ±10% tolerance?

A: Tolerance specifies the allowable deviation from the nominal zener voltage. ±5% tolerance provides tighter voltage regulation compared to ±10%. For the 4.7 V nominal rating, ±5% tolerance limits the zener voltage to 4.465 V to 4.935 V, while ±10% allows 4.23 V to 5.17 V. Applications requiring precise voltage regulation must use ±5% parts. The 1N750 alternative with ±10% tolerance is not suitable for precision regulation circuits.

Q: How does forward voltage affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode when conducting in the forward direction. Lower forward voltage reduces power dissipation and heat generation. 1N750A-1 and 1N5230B TR PBFREE offer 1.1 V forward voltage compared to 1.5 V for the original part, resulting in 0.4 V lower drop at 200 mA forward current. This improvement is beneficial for low-voltage applications and reduces thermal stress on the component.

Q: Can substitutes be mixed in the same design?

A: All recommended substitutes are electrically equivalent and can be used interchangeably within the same circuit. However, for manufacturing consistency and traceability, it is recommended to standardize on a single substitute part number across production runs. If multiple substitutes are used, ensure that procurement and quality documentation clearly identify the specific part number for each unit.

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