1N964B BK PBFREE Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N964B BK PBFREE is a through-hole zener diode manufactured by Central Semiconductor Corp, rated at 13 V nominal zener voltage with 500 mW power dissipation. This component operates across the temperature range of -65°C to 200°C and is packaged in the DO-35 (DO-204AH) axial configuration. The part is RoHS3 compliant and maintains active product status.

Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter tolerances for zener voltage, power rating, and package type. The following substitute components meet the core functional requirements of the 1N964B BK PBFREE.

Key Parameters

Parameter	1N964B BK PBFREE	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	13	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 9.9 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	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the 1N964B BK PBFREE are qualified based on the following core electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 13 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) axial through-hole
Mounting configuration: Through-hole
RoHS3 compliance

Tolerance Considerations: Substitute parts with zener voltage tolerance of ±5% or tighter (±2%) are functionally equivalent. Parts with ±2% tolerance (BZX55 series) provide improved voltage regulation accuracy compared to the ±5% specification of the 1N964B BK PBFREE.

Temperature Range: The 1N964B BK PBFREE operates to 200°C junction temperature. Substitute parts operating to -65°C ~ 175°C meet the lower temperature boundary but operate within acceptable limits for most applications. The extended upper temperature capability of the 1N964B BK PBFREE is not matched by all substitutes; applications requiring operation above 175°C must verify compatibility.

Impedance and Leakage: Impedance values range from 13 to 35 Ohms across the substitute group. Reverse leakage current varies from 100 nA to 5 µA depending on manufacturer and series. These variations are within acceptable limits for standard zener regulation applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ 200mA (V)	Temp Range (°C)	Package	Inventory
1N964B BK PBFREE	Central Semiconductor Corp	13	±5%	500	13	5 @ 9.9V	1.5	-65 ~ 200	DO-35	729
1N5243B-TAP	Vishay General Semiconductor	13	±5%	500	13	0.5 @ 9.9V	1.1	-65 ~ 175	DO-35	10300
1N5243BTR	Fairchild Semiconductor	13	±5%	500	13	0.5 @ 9.9V	1.2	-65 ~ 200	DO-35	2109
BZX55B13-TAP	Vishay General Semiconductor	13	±2%	500	26	0.1 @ 10V	1.5	-65 ~ 175	DO-35	4922
BZX55B13-TR	Vishay General Semiconductor	13	±2%	500	26	0.1 @ 10V	1.5	-65 ~ 175	DO-35	30108
BZX55C13-TAP	Vishay General Semiconductor	13	±5%	500	26	0.1 @ 10V	1.5	-65 ~ 175	DO-35	27458
BZX55C13-TR	Vishay General Semiconductor	13	±5%	500	26	0.1 @ 10V	1.5	-65 ~ 175	DO-35	24837
TZX13A-TR	Vishay General Semiconductor	13	-	500	35	1 @ 10V	1.5	-65 ~ 175	DO-35	30683
TZX13B-TR	Vishay General Semiconductor	13	-	500	35	1 @ 10V	1.5	-65 ~ 175	DO-35	7817
TZX13C-TAP	Vishay General Semiconductor	13	-	500	35	1 @ 10V	1.5	-65 ~ 175	DO-35	30868
TZX13C-TR	Vishay General Semiconductor	13	-	500	35	1 @ 10V	1.5	-65 ~ 175	DO-35	30658

Engineering Selection Recommendations

Direct Electrical Equivalents (±5% Tolerance Match):

The 1N5243B-TAP and 1N5243BTR maintain identical zener voltage tolerance (±5%) and impedance (13 Ohms) to the 1N964B BK PBFREE. The 1N5243BTR additionally matches the extended operating temperature range (-65°C ~ 200°C), making it the closest functional equivalent. Both parts are RoHS3 compliant and maintain active product status.

Improved Regulation Performance (±2% Tolerance):

The BZX55B13-TAP and BZX55B13-TR provide tighter voltage tolerance (±2%) with higher impedance (26 Ohms). These parts carry AEC-Q101 automotive qualification and are suitable for applications requiring improved voltage regulation accuracy. Operating temperature is limited to -65°C ~ 175°C.

Tolerance-Matched Alternatives (±5%):

The BZX55C13-TAP and BZX55C13-TR match the ±5% tolerance specification with identical 500 mW power rating and DO-35 package. These parts also carry AEC-Q101 qualification and are available in high inventory quantities.

Higher Impedance Options:

The TZX13A-TR, TZX13B-TR, TZX13C-TAP, and TZX13C-TR series feature 35 Ohm impedance with 1 µA reverse leakage. These parts are suitable for applications where higher source impedance is acceptable. All carry AEC-Q101 automotive qualification.

Temperature Consideration:

Applications requiring operation above 175°C must use either the 1N964B BK PBFREE or 1N5243BTR. All other substitutes are limited to 175°C maximum junction temperature.

Compliance and Certification:

All substitute parts maintain RoHS3 compliance and REACH unaffected status. BZX55 and TZX series parts include AEC-Q101 automotive qualification, suitable for automotive and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5243B-TAP directly replace the 1N964B BK PBFREE?

A: The 1N5243B-TAP is electrically equivalent in zener voltage (13 V), tolerance (±5%), power rating (500 mW), and package (DO-35). However, the operating temperature range differs: 1N5243B-TAP operates to 175°C while 1N964B BK PBFREE operates to 200°C. For applications operating below 175°C, direct substitution is valid.

Q: What is the difference between BZX55B13 and BZX55C13?

A: Both series are manufactured by Vishay and packaged in DO-35. The primary difference is zener voltage tolerance: BZX55B13 specifies ±2% tolerance while BZX55C13 specifies ±5% tolerance. Both maintain identical 500 mW power rating, 26 Ohm impedance, and -65°C ~ 175°C operating range. Selection depends on voltage regulation accuracy requirements.

Q: Are TZX13 series parts suitable replacements?

A: TZX13 series parts (TZX13A-TR, TZX13B-TR, TZX13C-TAP, TZX13C-TR) maintain 13 V zener voltage and 500 mW power rating in DO-35 package. The higher impedance (35 Ohms) and 1 µA reverse leakage differ from the 1N964B BK PBFREE. These parts are suitable for applications where higher source impedance is acceptable and carry AEC-Q101 automotive qualification.

Q: What packaging options are available?

A: All substitute parts are available in DO-35 (DO-204AH) axial through-hole package, matching the 1N964B BK PBFREE. Packaging variants include Cut Tape (CT) and Bulk configurations. Cut Tape packaging is standard for automated assembly; Bulk packaging is available for manual assembly or reel applications.

Q: Which substitute offers the best voltage regulation?

A: The BZX55B13-TAP and BZX55B13-TR provide the tightest voltage tolerance at ±2%, compared to ±5% for the 1N964B BK PBFREE. This tighter tolerance results in improved voltage regulation accuracy. Both parts are AEC-Q101 qualified and RoHS3 compliant.

Q: Can I use a substitute with a different impedance value?

A: Impedance variation from 13 Ohms (1N964B, 1N5243 series) to 26 Ohms (BZX55 series) or 35 Ohms (TZX series) affects circuit performance in high-impedance source applications. For standard voltage regulation circuits with low source impedance, impedance differences are not critical. Verify circuit performance for applications with high source impedance.

Q: Are all substitutes RoHS3 compliant?

A: Yes, all listed substitute parts are RoHS3 compliant and REACH unaffected, matching the compliance status of the 1N964B BK PBFREE.

Q: What is the inventory status for each substitute?

A: Inventory availability varies: BZX55B13-TR (30,108 pcs), TZX13A-TR (30,683 pcs), and TZX13C-TAP (30,868 pcs) offer the highest stock levels. 1N5243B-TAP (10,300 pcs) and BZX55C13-TAP (27,458 pcs) provide substantial availability. Verify current inventory before component selection.

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