1N4688-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4688-TP is a 4.7 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 axial through-hole packaging. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility. Substitute parts must satisfy identical voltage regulation specifications, power dissipation ratings, and package form factors to ensure direct circuit board replacement without design modification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	%
Power - Max	500	mW
Current - Reverse Leakage @ Vr	10	µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 100 mA
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the 1N4688-TP is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 4.7 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 axial through-hole
RoHS3 compliance

Secondary Compatibility Factors:

Reverse leakage current specifications
Forward voltage characteristics
Operating temperature range
Moisture sensitivity level (MSL 1 - Unlimited)

All substitute parts listed maintain the core electrical specifications (4.7 V, 500 mW, DO-35) and RoHS3 compliance. Variations in impedance, reverse leakage current at different test voltages, and forward voltage at different current levels represent acceptable parameter ranges within the same functional class. Parts with active product status are preferred over obsolete designations.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Vf (Max) @ If	Package	Product Status	RoHS Status
1N4688-TP	Micro Commercial Co	4.7 V	±5%	500 mW	1.5 V @ 100 mA	DO-35	Obsolete	ROHS3 Compliant
1N4688 TR PBFREE	Central Semiconductor Corp	4.7 V	±5%	500 mW	1.5 V @ 100 mA	DO-35	Active	ROHS3 Compliant
1N5230B-TAP	Vishay General Semiconductor	4.7 V	±5%	500 mW	1.1 V @ 200 mA	DO-35	Active	ROHS3 Compliant
1N5230B-TR	Vishay General Semiconductor	4.7 V	±5%	500 mW	1.1 V @ 200 mA	DO-35	Active	ROHS3 Compliant
TZX4V7C-TR	Vishay General Semiconductor	4.7 V	-	500 mW	1.5 V @ 200 mA	DO-35	Active	ROHS3 Compliant
TZX4V7D-TAP	Vishay General Semiconductor	4.7 V	-	500 mW	1.5 V @ 200 mA	DO-35	Active	ROHS3 Compliant
TZX4V7D-TR	Vishay General Semiconductor	4.7 V	-	500 mW	1.5 V @ 200 mA	DO-35	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement Priority:

The 1N4688 TR PBFREE (Central Semiconductor Corp) provides the most direct functional equivalence to the 1N4688-TP. Both parts share identical electrical specifications (4.7 V, ±5% tolerance, 500 mW, 1.5 V @ 100 mA forward voltage) and are classified as active products with ROHS3 compliance. This part is available in Tape & Reel packaging format.

Secondary Alternatives:

The 1N5230B series (1N5230B-TAP and 1N5230B-TR) from Vishay General Semiconductor are functionally equivalent with 4.7 V nominal voltage and 500 mW power rating. These parts feature lower forward voltage (1.1 V @ 200 mA) and lower reverse leakage current (5 µA @ 2 V), representing improved performance characteristics. The 1N5230B-TAP carries automotive qualification (AEC-Q101) and is available in Cut Tape packaging. The 1N5230B-TR variant is available in high inventory (97,389 units) and is suitable for high-volume applications.

Automotive-Grade Options:

The TZX4V7 series (TZX4V7C-TR, TZX4V7D-TAP, TZX4V7D-TR) from Vishay General Semiconductor provides automotive-qualified alternatives with AEC-Q101 certification and extended operating temperature range (-65°C to 175°C). These parts maintain 4.7 V nominal voltage and 500 mW power dissipation with active product status and ROHS3 compliance. The TZX series exhibits higher impedance (100 Ohms maximum) compared to the 1N5230B series (19 Ohms maximum).

All listed substitutes are available in DO-35 axial through-hole packaging and maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 1N4688-TP be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain the critical electrical specifications (4.7 V nominal voltage, 500 mW power dissipation) and identical DO-35 axial through-hole packaging. Direct board-level substitution is supported without circuit design modification.

Q: What is the difference between the 1N5230B and TZX4V7 series?

A: Both series provide 4.7 V, 500 mW Zener diodes in DO-35 packaging. The 1N5230B series exhibits lower impedance (19 Ohms maximum) and lower reverse leakage current (5 µA @ 2 V). The TZX4V7 series features higher impedance (100 Ohms maximum) and automotive qualification with extended temperature range (-65°C to 175°C). Selection depends on circuit impedance requirements and operating environment specifications.

Q: What is the significance of the packaging designations (TAP, TR, CT)?

A: TAP indicates Cut Tape packaging, TR indicates Tape & Reel packaging, and CT indicates Cut Tape packaging. These designations specify the delivery format for automated assembly processes. All formats contain identical electronic components; packaging selection is determined by manufacturing process requirements and volume considerations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, meeting regulatory requirements for hazardous substance restrictions in electronic equipment.

Q: Which substitute part offers the highest inventory availability?

A: The 1N5230B-TR from Vishay General Semiconductor provides the highest inventory availability with 97,389 units in stock, suitable for high-volume production requirements.

Q: Do the substitute parts support the same operating temperature range as the original 1N4688-TP?

A: The 1N4688-TP specifies 200°C maximum junction temperature. The 1N4688 TR PBFREE extends this to -65°C to 200°C. The 1N5230B-TAP specifies 175°C maximum. The TZX4V7 series specifies -65°C to 175°C. Operating temperature range selection depends on specific application thermal requirements.

Q: What is the moisture sensitivity level (MSL) for all substitute parts?

A: All substitute parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions and compatibility with standard PCB assembly and storage conditions.

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