CZRA4745-G Zener Diode 16V 1W Equivalent & Substitute Parts

Part Overview

The CZRA4745-G is a 16V 1W Zener diode manufactured by Comchip Technology in DO-214AC (SMA) surface mount packaging. This component is designed for voltage regulation and protection applications requiring a nominal Zener voltage of 16V with ±5% tolerance and 1W maximum power dissipation. The part is currently in active production status with 838 pieces available in inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design standardization, or inventory optimization.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5	%
Power - Max	1	W
Impedance (Max)	16	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 12.2 V
Voltage - Forward (Vf) (Max)	1.2	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	DO-214AC (SMA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CZRA4745-G are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Nominal Zener voltage: 16V
Voltage tolerance: ±5%
Maximum power rating: 1W
Package type: DO-214AC (SMA) surface mount
Impedance (Max): 16 Ohms
Reverse leakage current: 5 µA @ 12.2V
RoHS3 compliance
MSL rating: 1 (Unlimited)

The SMAJ4745A-TP from Micro Commercial Co meets all critical electrical specifications and mechanical compatibility requirements. Both parts share identical Zener voltage, tolerance, power rating, impedance, reverse leakage characteristics, and packaging format. Compliance certifications (RoHS3, REACH Unaffected, EAR99) are equivalent across both parts.

Parameter Comparison

Parameter	CZRA4745-G (Comchip)	SMAJ4745A-TP (Micro Commercial)	Match Status
Voltage - Zener (Nom)	16 V	16 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	1 W	1 W	Equivalent
Impedance (Max)	16 Ohms	16 Ohms	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 12.2 V	5 µA @ 12.2 V	Equivalent
Voltage - Forward (Vf) (Max)	1.2 V @ 200 mA	1.2 V @ 100 mA	Compatible
Operating Temperature Range	-55°C to 150°C	-65°C to 150°C	Compatible
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN	EAR99	EAR99	Equivalent

Engineering Selection Recommendations

CZRA4745-G (Comchip Technology): Select this part when Comchip Technology sourcing is required or preferred. The part is in active production status with established supply availability (838 pieces in stock). Full RoHS3 compliance and REACH Unaffected status confirm regulatory compliance for industrial and commercial applications.

SMAJ4745A-TP (Micro Commercial Co): This substitute part provides equivalent electrical performance with expanded operating temperature range (-65°C to 150°C versus -55°C to 150°C). Select this part when extended low-temperature operation is required or when Micro Commercial Co supply chain is preferred. Higher inventory availability (16,178 pieces) supports applications with larger volume requirements. RoHS3 compliance and REACH Unaffected status maintain regulatory equivalence.

Both parts are suitable for direct substitution in voltage regulation and protection circuits. Selection between CZRA4745-G and SMAJ4745A-TP depends on manufacturer preference, supply chain strategy, and specific operating temperature requirements. No design modifications are required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4745A-TP replace CZRA4745-G in existing designs?

A: Yes. Both parts share identical Zener voltage (16V), tolerance (±5%), power rating (1W), impedance (16 Ohms), reverse leakage current (5 µA @ 12.2V), and DO-214AC package format. Direct substitution is electrically and mechanically compatible.

Q: What is the difference in operating temperature range?

A: CZRA4745-G operates from -55°C to 150°C. SMAJ4745A-TP operates from -65°C to 150°C. The SMAJ4745A-TP provides 10°C additional low-temperature capability. For applications operating above -55°C, both parts are equivalent.

Q: Are both parts RoHS3 compliant?

A: Yes. Both CZRA4745-G and SMAJ4745A-TP are ROHS3 Compliant with MSL rating of 1 (Unlimited). Both are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the difference in forward voltage specification?

A: CZRA4745-G specifies Vf (Max) of 1.2V @ 200mA. SMAJ4745A-TP specifies Vf (Max) of 1.2V @ 100mA. Both parts meet the 1.2V maximum forward voltage requirement. The difference in test current does not affect substitution compatibility.

Q: Are the packages identical?

A: Yes. Both parts use DO-214AC (SMA) surface mount packaging with SMA flat leads. PCB footprints and reflow soldering profiles are identical.

Q: Which part should be selected for new designs?

A: Selection depends on supply chain strategy and operating temperature requirements. For standard applications operating above -55°C, either part is suitable. For applications requiring extended low-temperature operation below -55°C, SMAJ4745A-TP is required.

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