1N4738AW-TP Equivalent & Substitute Parts

Part Overview

The 1N4738AW-TP is a Zener diode rated at 8.2 V nominal voltage with 1 W maximum power dissipation in a surface mount SOD-123 package, manufactured by Micro Commercial Co. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts maintain the core electrical specifications while offering improved availability and active product status from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±5%	-
Power - Max	1	W
Impedance (Max)	4.5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 6 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 1N4738AW-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 8.2 V nominal
Maximum power dissipation: 1 W (or lower for reduced-power applications)
Package type: SOD-123 or SOD-123F (compatible surface mount packages)
Operating temperature range: -55°C to 150°C minimum
Voltage tolerance: ±5% or tighter
RoHS3 compliance

Substitution Categories:

Direct Equivalent (DFLZ8V2-TP): Identical electrical specifications with improved impedance characteristics and active product status. Package variant SOD-123F maintains mechanical compatibility.

Similar Substitutes (DDZ8V2CQ-7, DDZ9694-7, MMSZ5237B-7-F, CMHZ5237B TR PBFREE): Maintain 8.2 V zener voltage and SOD-123 package with reduced power ratings (310 mW to 500 mW). These parts are suitable for applications where full 1 W dissipation is not required. All feature active product status and enhanced reverse leakage characteristics.

Parametric Equivalent (MM1W8V2): Matches all electrical parameters of the original part including 1 W power rating, impedance, and reverse leakage specifications. Active product status from alternative manufacturer.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage	Vf (Max)	Temp Range	Package	Status
1N4738AW-TP	Micro Commercial Co	8.2 V	±5%	1 W	4.5 Ω	10 µA @ 6 V	1.2 V @ 200 mA	-55 to 150°C	SOD-123	Obsolete
DFLZ8V2-TP	Micro Commercial Co	8.2 V	±6%	1 W	2 Ω	5 µA @ 3 V	1.2 V @ 200 mA	-55 to 150°C	SOD-123F	Active
DDZ8V2CQ-7	Diodes Incorporated	8.2 V	±3%	310 mW	8 Ω	100 nA @ 6.5 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active
DDZ9694-7	Diodes Incorporated	8.2 V	±5%	500 mW	Not Specified	100 nA @ 6.2 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active
MMSZ5237B-7-F	Diodes Incorporated	8.2 V	±5%	500 mW	8 Ω	3 µA @ 6.5 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active
CMHZ5237B TR PBFREE	Central Semiconductor Corp	8.2 V	±5%	500 mW	8 Ω	3 µA @ 6.5 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active
MM1W8V2	NextGen Components	8.2 V	±5%	1 W	4.5 Ω	10 µA @ 6 V	1.2 V @ 10 mA	-55 to 150°C	SOD-123	Active

Engineering Selection Recommendations

For Direct Replacement with Enhanced Performance: DFLZ8V2-TP is the primary direct equivalent from the original manufacturer. It maintains 1 W power rating and identical operating temperature range while offering improved impedance characteristics (2 Ω vs. 4.5 Ω) and reduced reverse leakage. The SOD-123F package variant is mechanically compatible with SOD-123 footprints. Active product status ensures long-term availability.

For Automotive and High-Reliability Applications: DDZ8V2CQ-7 from Diodes Incorporated carries AEC-Q101 automotive qualification and features the tightest voltage tolerance (±3%) among available substitutes. Extended temperature range (-65 to 150°C) and extremely low reverse leakage (100 nA) support demanding environments. Power rating of 310 mW is suitable for applications not requiring full 1 W dissipation.

For General-Purpose Applications with Reduced Power Requirements: DDZ9694-7 and MMSZ5237B-7-F both provide 500 mW power rating with 8.2 V nominal voltage and ±5% tolerance matching the original specification. Both feature extended temperature range and low reverse leakage. DDZ9694-7 offers the highest inventory availability (488,400 units). MMSZ5237B-7-F provides equivalent performance with 85,100 units in stock.

For Full 1 W Power Rating Replacement: MM1W8V2 from NextGen Components provides complete parametric equivalence to the original 1N4738AW-TP, including 1 W power dissipation, 4.5 Ω impedance, and 10 µA reverse leakage. Active product status and high inventory (100,300 units) support production requirements.

For Cost-Optimized Designs: CMHZ5237B TR PBFREE from Central Semiconductor Corp delivers 500 mW power rating with matching voltage and tolerance specifications. Extended temperature range (-65 to 150°C) and RoHS3 compliance support modern design requirements.

Frequently Asked Questions (FAQ)

Q: Can DFLZ8V2-TP directly replace 1N4738AW-TP in existing designs? A: Yes. DFLZ8V2-TP maintains identical zener voltage (8.2 V), power rating (1 W), and operating temperature range (-55 to 150°C). The SOD-123F package is mechanically compatible with SOD-123 PCB footprints. Voltage tolerance increases from ±5% to ±6%, which is acceptable for most applications. Improved impedance (2 Ω vs. 4.5 Ω) provides superior performance.

Q: What is the difference between SOD-123 and SOD-123F packages? A: SOD-123F is a variant of the SOD-123 package with identical electrical performance and PCB footprint compatibility. The "F" designation indicates a flat-lead variant. Both packages are surface mount and mechanically interchangeable on standard SOD-123 footprints.

Q: Can I use a 500 mW rated part (DDZ9694-7, MMSZ5237B-7-F, CMHZ5237B) instead of the 1 W rated 1N4738AW-TP? A: Substitution is valid only if your circuit design does not require continuous 1 W power dissipation. If the application operates at or below 500 mW, these parts are suitable replacements. If sustained power dissipation exceeds 500 mW, use DFLZ8V2-TP or MM1W8V2 to maintain 1 W rating.

Q: Which substitute offers the best reverse leakage performance? A: DDZ8V2CQ-7 provides the lowest reverse leakage at 100 nanoamperes at 6.5 V, compared to the original specification of 10 microamperes at 6 V. This represents approximately 100 times lower leakage current, beneficial for precision voltage regulation applications.

Q: Is the extended temperature range (-65 to 150°C) of substitute parts compatible with designs specified for -55 to 150°C? A: Yes. Extended temperature range is a superset of the original specification and provides additional operational margin. All substitute parts with -65 to 150°C range are fully compatible with designs requiring -55 to 150°C operation.

Q: What is the significance of ±3% tolerance on DDZ8V2CQ-7 compared to ±5% on the original part? A: Tighter tolerance (±3%) provides more precise zener voltage regulation, reducing voltage variation across production batches. This is advantageous for applications requiring strict voltage reference accuracy. The ±5% tolerance of other substitutes matches the original specification.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the original 1N4738AW-TP specification. All parts also feature Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements.

Q: Which substitute has the highest inventory availability? A: DDZ9694-7 from Diodes Incorporated offers the highest inventory with 488,400 units in stock, followed by MM1W8V2 with 100,300 units. DFLZ8V2-TP provides 2,845 units from the original manufacturer.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message