1N4740G Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4740G is a through-hole zener diode manufactured by Taiwan Semiconductor Corporation, rated for 10 V nominal zener voltage with 1 W maximum power dissipation. This component is classified as an active product and is ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or supply chain optimization.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the 1N4740G are qualified based on the following criteria:

Electrical Parameters (Must Match):

Voltage - Zener (Nominal): 10 V
Tolerance: ±5%
Power - Maximum: 1 W
Impedance (Maximum): 7 Ohms
Operating Temperature Range: -65°C to 200°C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: DO-204AL (DO-41), Axial

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

All substitute parts listed maintain identical or equivalent electrical performance within the specified tolerance band and operate across the full temperature range. Packaging variations (Tape & Reel, Cut Tape, Bulk) do not affect functional compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power Max (W)	Zzt Max (Ohms)	Reverse Leakage @ Vr	Vf Max @ If	Temp Range (°C)	Package	RoHS
1N4740G	Taiwan Semiconductor Corporation	10	±5	1	7	10 µA @ 7.6 V	1.2 V @ 200 mA	-65 to 200	DO-204AL (DO-41)	ROHS3
1N4740A TR PBFREE	Central Semiconductor Corp	10	±5	1	7	10 µA @ 7.6 V	1.2 V @ 200 mA	-65 to 200	DO-41	ROHS3
1N4740A,113	Nexperia USA Inc.	10	±5	1	7	10 µA @ 7.6 V	1.2 V @ 200 mA	-65 to 200	DO-41	ROHS3
1N4740A,133	NXP Semiconductors	10	±5	1	7	10 µA @ 7.6 V	1.2 V @ 200 mA	-65 to 200	DO-41	Not Specified
1N4740A-T50A	onsemi	10	±5	1	7	10 µA @ 7.6 V	Not Specified	-65 to 200	DO-41	ROHS3
1N4740ATR	onsemi	10	±5	1	7	10 µA @ 7.6 V	Not Specified	-65 to 200	DO-41	ROHS3
BZX85C10-T50R	onsemi	10	±5	1	7	500 nA @ 7 V	1.2 V @ 200 mA	-65 to 200	DO-41	ROHS3

Engineering Selection Recommendations

All listed substitute parts are qualified for direct replacement based on electrical and mechanical parameter equivalence. Selection among substitutes should be based on the following factors:

Inventory Availability: Parts with higher stock levels provide supply chain continuity. The 1N4740A,133 (NXP Semiconductors) offers the highest inventory at 84,119 pieces, followed by BZX85C10-T50R (onsemi) at 9,164 pieces.

Compliance Certification: Parts explicitly marked ROHS3 compliant include 1N4740G, 1N4740A TR PBFREE, 1N4740A,113, 1N4740A-T50A, 1N4740ATR, and BZX85C10-T50R. The 1N4740A,133 does not specify RoHS status in the provided data.

Packaging Format: Cut Tape (CT) packaging is suitable for automated assembly processes. Bulk packaging (1N4740A,133) is appropriate for high-volume manual assembly or reel consolidation. Tape & Reel (TR) packaging (1N4740G) supports standard pick-and-place equipment.

Reverse Leakage Characteristics: The BZX85C10-T50R exhibits lower reverse leakage (500 nA @ 7 V) compared to other substitutes (10 µA @ 7.6 V), which may be advantageous in low-current applications requiring minimal standby current.

Frequently Asked Questions (FAQ)

Q: Can 1N4740A-T50A be used as a direct replacement for 1N4740G?

A: Yes. Both parts share identical zener voltage (10 V), tolerance (±5%), maximum power (1 W), impedance (7 Ohms), and operating temperature range (-65°C to 200°C). Both are ROHS3 compliant and use the DO-41 package. The primary difference is packaging format (Cut Tape versus Tape & Reel) and manufacturer.

Q: What is the difference between 1N4740A,113 and 1N4740A,133?

A: Both parts are electrically equivalent with 10 V zener voltage, ±5% tolerance, and 1 W power rating. The primary differences are manufacturer (Nexperia USA Inc. versus NXP Semiconductors) and packaging (Cut Tape versus Bulk). The part number suffix indicates different packaging and distribution channels.

Q: Is BZX85C10-T50R compatible with circuits designed for 1N4740G?

A: Yes. BZX85C10-T50R meets all electrical and mechanical requirements: 10 V zener voltage, ±5% tolerance, 1 W power dissipation, 7 Ohms impedance, and DO-41 through-hole package. The lower reverse leakage specification (500 nA @ 7 V versus 10 µA @ 7.6 V) represents improved performance and does not create incompatibility.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR), Cut Tape (CT), and Bulk packaging formats are distribution methods only. They do not affect the electrical characteristics or functional performance of the zener diode. Selection should be based on assembly equipment compatibility and supply chain requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Six of the seven substitute parts explicitly state ROHS3 compliance: 1N4740A TR PBFREE, 1N4740A,113, 1N4740A-T50A, 1N4740ATR, and BZX85C10-T50R. The 1N4740A,133 does not specify RoHS status in the provided documentation.

Q: What is the significance of the reverse leakage difference in BZX85C10-T50R?

A: BZX85C10-T50R specifies 500 nA reverse leakage at 7 V, while other parts specify 10 µA at 7.6 V. Lower reverse leakage indicates reduced standby current consumption. This characteristic is beneficial in battery-powered or low-power applications but does not affect compatibility in standard voltage regulation circuits.

Q: Can these parts be used interchangeably in production?

A: Yes, provided the assembly process accommodates the packaging format of the selected substitute. Cut Tape parts require tape-compatible feeders, while Bulk packaging requires manual placement or reel consolidation. Tape & Reel format integrates directly with standard pick-and-place equipment.

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