1N5239B-T Equivalent & Substitute Parts

Part Overview

The 1N5239B-T is a Zener diode rated at 9.1 V nominal voltage with 500 mW power dissipation, packaged in DO-204AH (DO-35) through-hole configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete product status, equivalent substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications. Substitute parts must maintain electrical equivalence across voltage regulation, power handling, and thermal characteristics while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	600	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 7 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N5239B-T is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Zener voltage nominal rating: 9.1 V
Maximum power dissipation: 500 mW
Through-hole mounting configuration
DO-204AH (DO-35) package family compatibility

Secondary Compatibility Factors:

Tolerance specification (±5% or tighter)
Reverse leakage current characteristics
Forward voltage drop at specified current
Operating temperature range
RoHS3 compliance status

Substitute parts are grouped into two categories: direct manufacturer equivalents from Vishay and cross-manufacturer alternatives from Nexperia. The 1N5239B-TR represents a direct equivalent with identical electrical specifications but different packaging format (Cut Tape versus bulk). The NZX9V1C,133 from Nexperia provides functional equivalence with improved tolerance (±2%) and enhanced reverse leakage performance, though with different package designation (ALF2).

Parameter Comparison

Parameter	1N5239B-T (Main)	1N5239B-TR (Substitute)	NZX9V1C,133 (Substitute)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Nexperia USA Inc.
Voltage - Zener (Nom)	9.1 V	9.1 V	9.1 V
Tolerance	±5%	±5%	±2%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	600 Ohms	10 Ohms	20 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 7 V	3 µA @ 7 V	500 nA @ 6 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	175°C	175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1N5239B-TR Selection Rationale: The 1N5239B-TR is the primary substitute for the 1N5239B-T. Both components are manufactured by Vishay General Semiconductor and maintain identical electrical specifications including 9.1 V nominal voltage, ±5% tolerance, and 500 mW power rating. The 1N5239B-TR holds active product status, ensuring long-term availability and supply chain continuity. The primary distinction is packaging format: the 1N5239B-TR is supplied in Cut Tape (CT) configuration versus the original bulk packaging. This substitute is directly interchangeable in all circuit applications where the 1N5239B-T was specified. Both components carry ROHS3 compliance and AEC-Q101 automotive qualification (where applicable).

NZX9V1C,133 Selection Rationale: The NZX9V1C,133 from Nexperia USA Inc. provides functional equivalence with enhanced performance characteristics. This substitute maintains the 9.1 V nominal voltage and 500 mW power rating but offers improved tolerance specification (±2% versus ±5%), lower reverse leakage current (500 nA @ 6 V versus 3 µA @ 7 V), and extended operating temperature range (-55°C to 175°C). The NZX9V1C,133 is supplied in ALF2 package designation but maintains DO-204AH (DO-35) axial through-hole compatibility. This substitute is suitable for applications requiring tighter voltage regulation or lower leakage performance. The component holds active product status and ROHS3 compliance.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and are classified as REACH Unaffected. Both substitutes are available in active production status, ensuring reliable supply for current and future applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5239B-TR be used as a direct replacement for the 1N5239B-T?

A: Yes. The 1N5239B-TR is electrically identical to the 1N5239B-T with matching 9.1 V nominal voltage, ±5% tolerance, 500 mW power rating, and through-hole DO-35 package configuration. The primary difference is packaging format (Cut Tape versus bulk). Both components are mechanically and electrically interchangeable in all circuit applications.

Q: What are the advantages of using NZX9V1C,133 over the 1N5239B-TR?

A: The NZX9V1C,133 offers three performance enhancements: tighter voltage tolerance (±2% versus ±5%), significantly lower reverse leakage current (500 nA @ 6 V versus 3 µA @ 7 V), and extended operating temperature range (-55°C to 175°C versus 175°C maximum). These characteristics make the NZX9V1C,133 suitable for precision voltage regulation applications and environments requiring enhanced low-temperature performance.

Q: Are all substitute parts compatible with the original DO-35 package footprint?

A: Yes. All substitute parts listed maintain DO-204AH (DO-35) axial through-hole package compatibility. Physical dimensions and lead spacing are equivalent, allowing direct PCB footprint compatibility. Package designation variations (such as ALF2 for the NZX9V1C,133) refer to supplier-specific labeling but do not affect mechanical compatibility.

Q: What is the significance of the impedance differences between substitute parts?

A: Impedance (Zzt) values indicate dynamic resistance characteristics at specified operating conditions. The 1N5239B-T specifies 600 Ohms maximum impedance, while substitutes show lower values (10 Ohms for 1N5239B-TR and 20 Ohms for NZX9V1C,133). Lower impedance values indicate improved voltage regulation stability and reduced voltage ripple in circuit applications. This represents an enhancement in substitute parts.

Q: Are all substitute parts suitable for automotive applications?

A: The 1N5239B-T carries AEC-Q101 automotive qualification. The 1N5239B-TR maintains identical Vishay manufacturing standards and is suitable for automotive applications. The NZX9V1C,133 from Nexperia is not explicitly marked with AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, the 1N5239B-TR is the recommended substitute.

Q: What is the difference between the forward voltage specifications?

A: Forward voltage (Vf) is measured at 200 mA forward current. The 1N5239B-T and 1N5239B-TR specify 1.1 V maximum, while the NZX9V1C,133 specifies 1.5 V maximum. This difference reflects different semiconductor material or junction design. For applications sensitive to forward voltage drop, the lower specification of the Vishay substitutes may be preferred.

Q: Can these Zener diodes be used interchangeably in reverse-biased voltage regulation circuits?

A: Yes, all substitute parts are functionally equivalent for reverse-biased Zener regulation applications. The 9.1 V nominal voltage is maintained across all parts. The NZX9V1C,133 offers superior performance due to lower reverse leakage current, making it preferable for applications requiring minimal standby current or precision voltage reference circuits.

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