BZX85C47 Zener Diode 47V 1W Equivalent & Substitute Parts

Part Overview

The BZX85C47 is a through-hole Zener diode manufactured by onsemi, rated for 47 V nominal Zener voltage and 1 W maximum power dissipation in DO-41 (DO-204AL) axial package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The BZX85C47 functions as a voltage regulation and transient protection component in electronic circuits. Substitute parts must maintain electrical compatibility across the critical parameters: Zener voltage (47 V), power rating (1 W minimum), forward voltage characteristics, and through-hole axial mounting configuration.

Key Parameters

Parameter	BZX85C47 Specification	Unit
Voltage - Zener (Nom)	47	V
Tolerance	±6%	%
Power - Max	1	W
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 33 V	nA
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	V
Operating Temperature Range	-65°C to 200°C	°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the BZX85C47 is determined by the following mandatory parameters:

Primary Electrical Criteria:

Zener voltage: 47 V nominal (tolerance range acceptable within design margin)
Power rating: minimum 1 W (higher ratings acceptable)
Forward voltage: 1.2 V @ 200 mA (maximum)
Impedance: maximum 90 Ohms (lower values acceptable)

Mechanical & Environmental Criteria:

Mounting type: Through Hole (required)
Package: DO-41 or DO-204AL axial configuration (required)
Operating temperature: must encompass application requirements
Moisture sensitivity: MSL 1 (Unlimited) preferred for reliability

Compliance Criteria:

REACH Status: REACH Unaffected (all candidates meet this)
RoHS compliance status noted for regulatory requirements

Substitute parts are grouped by tolerance grade (±2%, ±5%, ±6%, ±10%) and product status (Active vs. Obsolete). Parts with tighter tolerances and active product status are preferred for new designs.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Product Status	RoHS Status
BZX85C47	onsemi	47 V	±6%	1 W	90 Ω	1.2 V @ 200 mA	-65°C to 200°C	Obsolete	Not specified
1N4756A	Lumimax Optoelectronic Technology	47 V	±5%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 200°C	Active	RoHS Compliant
BZX85C47-TAP	Vishay General Semiconductor - Diodes Division	47 V	±5%	1.3 W	90 Ω	Not specified	-55°C to 175°C	Active	ROHS3 Compliant
1N3036B-1	Microchip Technology	47 V	±5%	1 W	80 Ω	1.2 V @ 200 mA	-55°C to 175°C	Active	RoHS non-compliant
1N4756 G	Microsemi Corporation	47 V	±10%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 175°C	Active	RoHS non-compliant
1N4756AE3/TR13	Microchip Technology	47 V	±5%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 150°C	Active	ROHS3 Compliant
1N4756AP/TR12	Microchip Technology	47 V	±5%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 150°C	Active	RoHS non-compliant
1N4756AP/TR8	Microchip Technology	47 V	±5%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 150°C	Active	RoHS non-compliant
1N4756CE3/TR13	Microchip Technology	47 V	±2%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 150°C	Active	ROHS3 Compliant
1N4756CP/TR12	Microchip Technology	47 V	±2%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 150°C	Active	RoHS non-compliant
1N4756CP/TR8	Microchip Technology	47 V	±2%	1 W	80 Ω	1.2 V @ 200 mA	-65°C to 150°C	Active	RoHS non-compliant

Engineering Selection Recommendations

For New Designs (Preferred Substitutes):

Select from parts with Active product status and RoHS3 compliance:

1N4756AE3/TR13 (Microchip Technology): ±5% tolerance, ROHS3 compliant, -65°C to 150°C operating range, Tape & Reel packaging
1N4756CE3/TR13 (Microchip Technology): ±2% tolerance (tighter), ROHS3 compliant, -65°C to 150°C operating range, Tape & Reel packaging

For Existing Designs Requiring Direct Replacement:

1N4756A (Lumimax Optoelectronic Technology): Active status, RoHS Compliant, matches original -65°C to 200°C temperature range, ±5% tolerance
BZX85C47-TAP (Vishay General Semiconductor): Active status, ROHS3 compliant, higher power rating (1.3 W), same impedance specification

For Cost-Sensitive Applications (Non-RoHS Environments):

1N4756AP/TR8 or 1N4756AP/TR12 (Microchip Technology): Active status, ±5% tolerance, standard Tape & Reel packaging
1N4756CP/TR8 or 1N4756CP/TR12 (Microchip Technology): Active status, ±2% tolerance for improved voltage regulation

Not Recommended for New Designs:

1N4756 G (Microsemi Corporation): ±10% tolerance exceeds original specification; use only if tolerance margin is acceptable
1N3036B-1 (Microchip Technology): RoHS non-compliant; limited inventory (1100 pcs)

Temperature Range Consideration:

The original BZX85C47 operates to 200°C. Most active substitutes operate to 150°C or 175°C. Verify application maximum operating temperature before selection. If 200°C operation is required, use 1N4756A (Lumimax) which maintains the full temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4756AE3/TR13 as a direct replacement for BZX85C47?

A: Yes. Both parts have 47 V nominal Zener voltage, 1 W power rating, ±5% tolerance, and identical forward voltage characteristics (1.2 V @ 200 mA). The 1N4756AE3/TR13 has lower impedance (80 Ω vs. 90 Ω), which improves regulation. Operating temperature range differs (-65°C to 150°C vs. -65°C to 200°C); verify your application does not exceed 150°C.

Q: What is the difference between 1N4756AP and 1N4756CP variants?

A: The primary difference is tolerance grade. 1N4756AP has ±5% tolerance; 1N4756CP has ±2% tolerance. Both have identical electrical characteristics otherwise. Select 1N4756CP for applications requiring tighter voltage regulation.

Q: Why do some part numbers include "TR8" or "TR12" suffixes?

A: These suffixes indicate tape reel specifications for automated assembly. TR8 and TR12 refer to different reel configurations. Both are functionally equivalent; selection depends on your assembly equipment compatibility.

Q: Is BZX85C47-TAP a better choice than 1N4756A?

A: BZX85C47-TAP offers higher power rating (1.3 W vs. 1 W), which provides additional thermal margin. However, it operates to 175°C maximum (vs. 200°C for 1N4756A). Choose BZX85C47-TAP if higher power dissipation is required; choose 1N4756A if full temperature range is needed.

Q: Can I substitute a part with ±2% tolerance for the original ±6% part?

A: Yes. Tighter tolerance (±2%) is a superior specification and will function correctly in any circuit designed for ±6% tolerance. This improves voltage regulation accuracy.

Q: What does "RoHS Compliant" vs. "ROHS3 Compliant" mean?

A: Both indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 is the current EU directive version. For new designs, ROHS3 compliance is preferred. For legacy systems, either specification is acceptable.

Q: Does impedance difference (80 Ω vs. 90 Ω) affect circuit performance?

A: Lower impedance (80 Ω) provides better voltage regulation under load changes. This is a beneficial characteristic. Circuits designed for 90 Ω impedance will function correctly with 80 Ω parts.

Q: Which substitute has the best availability?

A: BZX85C47-TAP (Vishay) has the highest inventory (23,121 pcs), followed by 1N4756A (Lumimax, 10,265 pcs). For long-term supply security, these are preferred choices.

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