SMAZ18-TP Equivalent & Substitute Parts

Part Overview

The SMAZ18-TP is an 18 V, 1 W Zener diode manufactured by Micro Commercial Co, housed in a DO-214AC (SMA) surface mount package. This component is designed for voltage regulation and transient protection applications in electronic circuits. The part is currently Active in product status with 6984 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to availability constraints, procurement lead times, or design flexibility needs.

Substiute Parts

SMAZ18-TP

Micro Commercial CoIn Stock: 7061SMAZ18-TP Datasheet

Current PartRFQ

SMAJ4746A-TP

Micro Commercial CoIn Stock: 2495SMAJ4746A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAZ18-TP with the SMAJ4746A-TP is permissible based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Zener voltage (nominal): 18 V
• Tolerance: ±5%
• Maximum power dissipation: 1 W
• Package type: DO-214AC (SMA)
• Mounting type: Surface Mount
• Operating temperature range: -65°C to 150°C
• RoHS3 compliance
• Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variations: The SMAJ4746A-TP exhibits differences in impedance (20 Ohms vs. 15 Ohms maximum) and reverse leakage current (5 µA @ 13.7 V vs. 500 nA @ 13.7 V), as well as forward voltage specification at a different current level (1.2 V @ 100 mA vs. 1.2 V @ 200 mA). These variations remain within acceptable tolerances for Zener diode applications where the primary function is voltage regulation at the specified 18 V nominal level.

Parameter Comparison

Engineering Selection Recommendations

Both the SMAZ18-TP and SMAJ4746A-TP are Active products manufactured by Micro Commercial Co and carry identical RoHS3 compliance and REACH Unaffected status. Both components meet the same regulatory and environmental requirements for deployment in commercial and industrial applications.

The SMAZ18-TP is the primary selection when available, with 6984 units in current stock. The SMAJ4746A-TP serves as a direct functional equivalent with 2455 units available and is suitable for applications where the primary requirement is 18 V voltage regulation at 1 W maximum power dissipation in a surface mount DO-214AC package.

Selection between these parts should be based on procurement availability, lead time requirements, and inventory status rather than electrical performance differentiation, as both components satisfy the core functional specifications for 18 V Zener diode applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4746A-TP replace SMAZ18-TP in existing designs?

A: Yes. Both parts share identical nominal Zener voltage (18 V), tolerance (±5%), maximum power rating (1 W), package type (DO-214AC, SMA), and operating temperature range (-65°C to 150°C). The parts are electrically and mechanically interchangeable for voltage regulation applications.

Q: What are the differences between these two Zener diodes?

A: The SMAJ4746A-TP has a higher maximum impedance (20 Ohms vs. 15 Ohms) and higher reverse leakage current (5 µA vs. 500 nA at 13.7 V). The forward voltage specification is measured at different current levels (100 mA vs. 200 mA). These differences do not affect substitutability for standard voltage regulation applications.

Q: Are the packaging formats compatible?

A: Both parts use the DO-214AC (SMA) surface mount package. The SMAZ18-TP is supplied in Tape & Reel (TR) format, while the SMAJ4746A-TP is supplied in Cut Tape (CT) and Digi-Reel® format. The physical component dimensions and land pattern requirements are identical, ensuring PCB compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SMAZ18-TP and SMAJ4746A-TP are ROHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99 with the same HTSUS code (8541.10.0050). Both carry Moisture Sensitivity Level 1 (Unlimited).

Q: Which part should be selected for new designs?

A: Either part is acceptable for new designs. Selection should be based on current inventory availability and procurement lead times. Both parts are Active products with equivalent electrical performance for 18 V Zener diode applications.