DL4733A-TP Equivalent & Substitute Parts

Part Overview

The DL4733A-TP is a Zener diode rated at 5.1 V, 1 W, manufactured by Micro Commercial Co in a surface mount MELF (DO-213AB) package. This component functions as a voltage regulator and protective device in electronic circuits. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain identical electrical specifications while accommodating different package formats and manufacturer sourcing requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.1	V
Tolerance	±5%	%
Power - Maximum	1	W
Impedance (Maximum)	7	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 1 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—

Substitute Part Grouping Explanation

Substitution of the DL4733A-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Zener (Nominal): 5.1 V
Tolerance: ±5%
Power - Maximum: 1 W
Impedance (Maximum): 7 Ohms
Current - Reverse Leakage @ Vr: 10 µA @ 1 V (or lower)
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA
Operating Temperature Range: -65°C to 175°C (or equivalent)
Mounting Type: Surface Mount

Package Considerations: Substitute parts are grouped into two categories based on package format: MELF (DO-213AB) and SMA (DO-214AC). Both package types are surface mount configurations suitable for automated assembly. Package selection depends on circuit board layout and assembly equipment compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ Vr (µA @ 1V)	Vf @ If (V @ mA)	Temp Range (°C)	Package	Status	RoHS
DL4733A-TP	Micro Commercial Co	5.1	±5%	1	7	10 @ 1	1.2 @ 200	-65 to 175	DO-213AB, MELF	Obsolete	ROHS3
SMAJ4733A-TP	Micro Commercial Co	5.1	±5%	1	7	10 @ 1	—	-65 to 150	DO-214AC, SMA	Active	ROHS3
1N4733AUR	Microchip Technology	5.1	±5%	1	7	10 @ 1	1.2 @ 200	-65 to 175	DO-213AB, MELF	Active	Non-compliant
1N4733AUR/TR	Microchip Technology	5.1	±5%	1	7	10 @ 1	1.2 @ 200	-65 to 175	DO-213AB, MELF	Active	ROHS3
CDLL3826A/TR	Microchip Technology	5.1	±5%	1	7	3 @ 1	1.2 @ 200	-65 to 175	DO-213AB, MELF	Active	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (MELF Package):

The 1N4733AUR/TR and CDLL3826A/TR are direct electrical equivalents in the MELF (DO-213AB) package format. Both parts maintain identical zener voltage, power rating, impedance, and forward voltage specifications. The 1N4733AUR/TR is ROHS3 compliant and recommended for new designs requiring RoHS certification. The CDLL3826A/TR offers superior reverse leakage characteristics (3 µA versus 10 µA), providing enhanced performance in low-leakage applications while maintaining full compliance.

The 1N4733AUR (bulk packaging) is functionally equivalent but carries RoHS non-compliant status and is unsuitable for applications requiring regulatory compliance.

Alternative Package Format (SMA Package):

The SMAJ4733A-TP provides electrical equivalence in the DO-214AC (SMA) package format. This part is manufactured by Micro Commercial Co and maintains ROHS3 compliance. The operating temperature range extends to 150°C (versus 175°C for MELF variants), which is acceptable for most industrial applications. SMA package selection is appropriate when circuit board layout or assembly equipment requires this footprint.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: SMAJ4733A-TP, 1N4733AUR/TR, or CDLL3826A/TR. The 1N4733AUR is excluded from RoHS-compliant applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4733A-TP replace DL4733A-TP in all applications?

A: SMAJ4733A-TP is electrically equivalent but uses a different package format (DO-214AC SMA versus DO-213AB MELF). Substitution is valid only if the circuit board layout and assembly equipment accommodate the SMA footprint. The maximum operating temperature is 150°C compared to 175°C for the original part.

Q: What is the difference between 1N4733AUR and 1N4733AUR/TR?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging: 1N4733AUR is supplied in bulk, while 1N4733AUR/TR is supplied in tape and reel format. The 1N4733AUR/TR is ROHS3 compliant, whereas 1N4733AUR is not.

Q: Why does CDLL3826A/TR have lower reverse leakage current?

A: CDLL3826A/TR exhibits 3 µA reverse leakage at 1 V compared to 10 µA for other equivalents. This represents superior device performance and is acceptable for direct substitution. Lower leakage current is beneficial in precision voltage regulation and low-power applications.

Q: Are all substitute parts surface mount compatible?

A: Yes. All listed substitutes are surface mount devices. DL4733A-TP, 1N4733AUR, 1N4733AUR/TR, and CDLL3826A/TR use MELF (DO-213AB) packages. SMAJ4733A-TP uses SMA (DO-214AC) package. Both package types are surface mount configurations suitable for automated assembly.

Q: Which substitute part is recommended for new production?

A: For new designs requiring ROHS3 compliance and maximum operating temperature of 175°C, select 1N4733AUR/TR or CDLL3826A/TR. CDLL3826A/TR is preferred when low reverse leakage current is a design requirement. For applications where SMA package is acceptable, SMAJ4733A-TP is a valid alternative.

Q: What is the moisture sensitivity level for all parts?

A: All listed parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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