1N4740A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4740A-TP is a 10 V, 1 W Zener diode manufactured by Micro Commercial Co in a through-hole DO-41G package. This component is classified as obsolete, though 1,071 units remain in stock. The part operates across a temperature range of -65°C to 200°C and is ROHS3 compliant. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability and active product support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Power - Max	1	W
Tolerance	±5%	—
Impedance (Max)	7	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7.6 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4740A-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 10 V (exact match required)
Power - Max: 1 W or greater
Tolerance: ±5% or tighter
Impedance (Max): 7 Ohms or less
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent

Secondary Considerations:

Operating Temperature Range: Minimum -65°C to 200°C preferred; -65°C to 150°C acceptable for non-extended-range applications
Current - Reverse Leakage: 10 µA @ 7.6 V or lower
Voltage - Forward (Vf): 1.2 V @ 200 mA or lower
Product Status: Active status preferred for long-term availability
Compliance: ROHS3 and REACH Unaffected required

Substitute parts are grouped into three categories based on electrical performance and availability:

Category 1 - Direct Equivalents (1 W Power Rating): Parts with identical 1 W power rating and matching electrical specifications.

Category 2 - Enhanced Performance (1.3 W Power Rating): Parts with higher power dissipation capability (1.3 W) that maintain all other electrical parameters, providing improved thermal margin.

Category 3 - Precision Variants (±2% Tolerance): Parts with tighter voltage tolerance (±2%) compared to the standard ±5%, offering improved voltage regulation accuracy.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance	Zzt (Ω)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Package	Status
1N4740A-TP	Micro Commercial Co	10	1	±5%	7	10 @ 7.6	1.2 @ 200 mA	-65 to 200	DO-41G	Obsolete
1N4740AP-TP	Micro Commercial Co	10	1	±5%	7	10 @ 7.6	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N4740A-T50A	onsemi	10	1	±5%	7	10 @ 7.6	Not specified	-65 to 200	DO-41	Active
1N4740AP/TR8	Microchip Technology	10	1	±5%	7	10 @ 7.6	1.2 @ 200 mA	-65 to 150	DO-204AL (DO-41)	Active
1N4740A	Lumimax Optoelectronic Technology	10	1	±5%	7	10 @ 7.6	1.2 @ 200 mA	-65 to 200	DO-41G	Active
1N4740A-TAP	Vishay General Semiconductor	10	1.3	±5%	7	10 @ 7.6	1.2 @ 200 mA	-55 to 175	DO-204AL (DO-41)	Active
1N4740A-TR	Vishay General Semiconductor	10	1.3	±5%	7	10 @ 7.6	1.2 @ 200 mA	-55 to 175	DO-204AL (DO-41)	Active
1N4740AGE3	Microchip Technology	10	1	±5%	7	10 @ 7.6	1.2 @ 200 mA	-65 to 175	DO-41	Active
BZX85B10-TAP	Vishay General Semiconductor	10	1.3	±2%	7	500 nA @ 7.5	Not specified	-55 to 175	DO-204AL (DO-41)	Active
BZX85B10-TR	Vishay General Semiconductor	10	1.3	±2%	7	500 nA @ 7.5	Not specified	-55 to 175	DO-204AL (DO-41)	Active
BZX85C10-TAP	Vishay General Semiconductor	10	1.3	±5%	7	500 nA @ 7.5	Not specified	-55 to 175	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The 1N4740A-T50A (onsemi) and 1N4740A (Lumimax Optoelectronic Technology) provide direct electrical equivalence to the 1N4740A-TP. Both maintain the full -65°C to 200°C operating temperature range and 1 W power rating. The onsemi part is available in cut tape packaging with 6,758 units in stock, providing superior availability. The Lumimax part offers the highest inventory level at 16,094 units and maintains the original DO-41G package designation.

For Extended Temperature Range Applications:

The 1N4740AP-TP (Micro Commercial Co) and 1N4740AP/TR8 (Microchip Technology) are suitable for applications requiring the full -65°C to 200°C range, though both specify a maximum operating temperature of 150°C. The 1N4740AGE3 (Microchip Technology) extends to -65°C to 175°C and is available in bulk packaging with 759 units in stock.

For Enhanced Thermal Performance:

The 1N4740A-TAP and 1N4740A-TR (Vishay General Semiconductor) provide 1.3 W power dissipation, exceeding the 1 W specification of the original part. These automotive-grade components (AEC-Q101 qualified) offer improved thermal margin for applications with higher power requirements. Both are available in cut tape packaging with 3,100 and 2,012 units respectively.

For Precision Voltage Regulation:

The BZX85B10-TAP and BZX85B10-TR (Vishay General Semiconductor) feature ±2% tolerance compared to the ±5% standard, with significantly lower reverse leakage current (500 nA @ 7.5 V versus 10 µA @ 7.6 V). These automotive-grade parts provide superior voltage regulation accuracy. The BZX85B10-TR offers the highest inventory at 25,474 units.

For Tolerance-Matched Performance:

The BZX85C10-TAP (Vishay General Semiconductor) maintains ±5% tolerance matching while providing 1.3 W power rating and reduced reverse leakage. This part balances performance enhancement with specification alignment.

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.3 W Zener diode as a substitute for the 1 W 1N4740A-TP?

A: Yes. The 1.3 W parts (1N4740A-TAP, 1N4740A-TR, BZX85C10-TAP) maintain all other electrical parameters while providing additional thermal dissipation capability. This represents an enhancement rather than a compromise and is suitable for direct substitution.

Q: What is the difference between the ±5% and ±2% tolerance variants?

A: Tolerance specifies the allowable deviation from the nominal 10 V zener voltage. The ±2% variants (BZX85B10-TAP, BZX85B10-TR) provide tighter voltage regulation with maximum deviation of ±0.2 V, compared to ±0.5 V for ±5% parts. Selection depends on voltage regulation precision requirements.

Q: Are the DO-41 and DO-204AL packages physically identical?

A: The DO-41 and DO-204AL designations refer to the same physical package format for axial through-hole components. Both are compatible with standard through-hole PCB layouts.

Q: Why do some substitutes specify lower operating temperature ranges?

A: The 1N4740AP-TP and 1N4740AP/TR8 specify -65°C to 150°C maximum junction temperature, compared to the original -65°C to 200°C. These parts are suitable for applications not requiring extended high-temperature operation. For applications requiring full -65°C to 200°C range, select 1N4740A-T50A or 1N4740A.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects standby power consumption and voltage regulation stability. The BZX85 series parts (500 nA @ 7.5 V) exhibit significantly lower leakage than the 1N4740A series (10 µA @ 7.6 V). Lower leakage is beneficial for precision voltage regulation applications but is not required for standard applications.

Q: Which substitute offers the best availability?

A: The 1N4740A (Lumimax Optoelectronic Technology) provides the highest inventory at 16,094 units with active product status and full -65°C to 200°C temperature range. The BZX85B10-TR (Vishay) offers 25,474 units with enhanced specifications.

Q: Are automotive-grade parts (AEC-Q101) suitable for non-automotive applications?

A: Yes. Automotive-grade qualification (1N4740A-TAP, 1N4740A-TR, BZX85B10-TAP, BZX85B10-TR, BZX85C10-TAP) indicates enhanced reliability testing and quality assurance. These parts are fully compatible with non-automotive applications and provide equivalent or superior performance.

Q: What packaging options are available for high-volume production?

A: Cut tape (CT) packaging is standard for production quantities. The 1N4740A-T50A (onsemi), 1N4740A-TAP, 1N4740A-TR, BZX85B10-TAP, BZX85B10-TR, and BZX85C10-TAP all offer cut tape packaging. Tape & Reel (TR) options are available for 1N4740AP-TP and 1N4740AP/TR8.

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