UDZ11B-7 Equivalent & Substitute Parts

Part Overview

The UDZ11B-7 is a Zener diode manufactured by Diodes Incorporated, rated at 11 V nominal with 200 mW maximum power dissipation in a surface mount SOD-323 package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs while maintaining the same functional voltage regulation characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Power - Max	200	mW
Tolerance	±2%	—
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 8 V
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-323	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the UDZ11B-7 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 11 V nominal
Package type: SOD-323 surface mount
Mounting compatibility: Surface mount
Operating temperature range: Minimum -65°C to 150°C
Regulatory compliance: RoHS3 compliant, REACH unaffected

Secondary Compatibility Factors:

Power rating: 200 mW or higher
Tolerance: ±2% or ±5% acceptable
Reverse leakage current: 100 nA @ 8 V
Impedance: 30 Ohms or lower

Substitute parts are grouped into two categories based on power rating: parts with 200 mW rating (direct 1:1 substitution) and parts with 300 mW or higher rating (uprated substitutes with enhanced thermal performance). All substitute parts maintain identical zener voltage, package form factor, and regulatory compliance status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Power - Max	Tolerance	Impedance (Max)	Reverse Leakage @ Vr	Operating Temp	Package	Product Status
UDZ11B-7	Diodes Incorporated	11 V	200 mW	±2%	30 Ohms	100 nA @ 8 V	-65 to 150°C	SOD-323	Active
BZT52C11S-TP	Micro Commercial Co	11 V	200 mW	±5%	20 Ohms	100 nA @ 8 V	-65 to 150°C	SOD-323	Active
BZX384-B11,115	Nexperia USA Inc.	11 V	300 mW	±2%	20 Ohms	100 nA @ 8 V	-65 to 150°C	SOD-323	Active
MM3Z11VT1G	onsemi	11 V	300 mW	±5%	20 Ohms	-65 to 150°C	SOD-323	Active
PZU11B2A,115	Nexperia USA Inc.	11 V	320 mW	±2%	10 Ohms	100 nA @ 8 V	-55 to 150°C	SOD-323	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and full RoHS3 compliance with REACH unaffected designation. Selection between substitute options is based on specific application requirements:

Direct Equivalent (200 mW Rating): BZT52C11S-TP provides electrical equivalence at the same 200 mW power rating. This part exhibits lower impedance (20 Ohms versus 30 Ohms) and wider tolerance (±5% versus ±2%), suitable for applications where impedance performance is beneficial and tolerance relaxation is acceptable.

Uprated Substitutes (300 mW and 320 mW Ratings): BZX384-B11,115, MM3Z11VT1G, and PZU11B2A,115 provide enhanced power dissipation capability. These parts are suitable for applications requiring thermal margin or higher current handling. BZX384-B11,115 and PZU11B2A,115 maintain ±2% tolerance matching the original specification. MM3Z11VT1G operates at ±5% tolerance. PZU11B2A,115 offers the lowest impedance (10 Ohms) and highest power rating (320 mW) with a reduced operating temperature minimum of -55°C.

All substitute parts are packaged in SOD-323 and are compatible with existing surface mount assembly processes. Inventory availability varies across manufacturers, with MM3Z11VT1G showing the highest stock level at 65,200 pieces.

Frequently Asked Questions (FAQ)

Q: Can BZT52C11S-TP be used as a direct replacement for UDZ11B-7?

A: Yes. BZT52C11S-TP is a direct substitute with identical 11 V zener voltage, 200 mW power rating, SOD-323 package, and operating temperature range. The tolerance difference (±5% versus ±2%) and lower impedance (20 Ohms versus 30 Ohms) are within acceptable substitution parameters for zener diode applications.

Q: What is the difference between 200 mW and 300 mW rated parts?

A: Power rating indicates maximum continuous power dissipation capability. The 300 mW and 320 mW rated parts (BZX384-B11,115, MM3Z11VT1G, PZU11B2A,115) provide higher thermal headroom and can handle greater current loads than the 200 mW rated parts. These uprated parts are suitable for applications with higher power requirements or thermal stress conditions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the UDZ11B-7.

Q: Does impedance affect substitution compatibility?

A: Impedance is a secondary parameter in zener diode substitution. Lower impedance values (10 to 20 Ohms in the substitute list) indicate better voltage regulation performance compared to the original 30 Ohms. Substitution with lower impedance parts is acceptable and often beneficial for circuit performance.

Q: Can MM3Z11VT1G be used if the application requires ±2% tolerance?

A: MM3Z11VT1G operates at ±5% tolerance, which is wider than the ±2% specification of UDZ11B-7. This part is suitable only for applications where ±5% tolerance is acceptable. For applications requiring ±2% tolerance, use BZX384-B11,115 or PZU11B2A,115.

Q: What is the operating temperature consideration for PZU11B2A,115?

A: PZU11B2A,115 has a minimum operating temperature of -55°C, compared to -65°C for the original UDZ11B-7. This part is suitable for applications operating above -55°C. For applications requiring operation below -55°C, use BZT52C11S-TP, BZX384-B11,115, or MM3Z11VT1G.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in Tape & Reel (TR) packaging with SOD-323 surface mount package type, ensuring compatibility with standard pick-and-place assembly equipment and existing PCB designs.

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