DL5254B-TP Equivalent & Substitute Parts

Part Overview

The DL5254B-TP is a 27 V, 500 mW Zener diode manufactured by Micro Commercial Co in a Mini MELF (DO-213AC) surface mount package. This component is classified as obsolete, indicating discontinued production and limited availability. The part maintains 968 units in current inventory stock. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. Due to obsolete status, identifying functionally equivalent substitute parts is necessary for design continuity, procurement reliability, and long-term product support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Tolerance	±5%	-
Power - Maximum	500	mW
Impedance (Maximum)	41	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 21 V	-
Voltage - Forward (Maximum) @ If	1.1 V @ 200 mA	-
Operating Temperature Range	-65°C to 175°C	-
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the DL5254B-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 27 V nominal
Power dissipation: 500 mW maximum
Tolerance: ±5%
Impedance: 41 Ohms maximum
Reverse leakage current: 100 nA @ 21 V
Forward voltage: 1.1 V @ 200 mA
Operating temperature range: -65°C to 175°C
Surface mount configuration
RoHS3 compliance

Package Compatibility: Substitute parts are grouped into two categories based on package type:

Mini MELF (SOD-80) Package Group – Direct mechanical and electrical equivalents maintaining the original DO-213AC/MINI-MELF/SOD-80 form factor
SOD-123 Package Group – Electrical equivalents with different surface mount package geometry

Parts meeting all electrical specifications but with different impedance values (45 Ohms vs. 41 Ohms) or forward voltage characteristics are classified as functional alternatives with minor parameter deviations.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range (°C)	Package	Status	RoHS
DL5254B-TP	Micro Commercial Co	27	±5%	500	41	100 nA @ 21 V	1.1 V @ 200 mA	-65 to 175	DO-213AC	Obsolete	ROHS3
MMSZ5254B-TP	Micro Commercial Co	27	±5%	500	41	100 nA @ 21 V	900 mV @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
1N5254BUR-1	Microchip Technology	27	±5%	500	41	100 nA @ 21 V	1.1 V @ 200 mA	-65 to 175	DO-213AA	Active	Non-compliant
TLZ27B-GS08	Vishay General Semiconductor	27	-	500	45	40 nA @ 23.7 V	1.5 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TLZ27B-GS18	Vishay General Semiconductor	27	-	500	45	40 nA @ 23.7 V	1.5 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TLZ27C-GS08	Vishay General Semiconductor	27	-	500	45	40 nA @ 24.3 V	1.5 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TLZ27C-GS18	Vishay General Semiconductor	27	-	500	45	40 nA @ 24.3 V	1.5 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TLZ27D-GS08	Vishay General Semiconductor	27	-	500	45	40 nA @ 25 V	1.5 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TZM5254B-GS08	Vishay General Semiconductor	27	±5%	500	41	100 nA @ 21 V	1.1 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TZM5254B-GS18	Vishay General Semiconductor	27	±5%	500	41	100 nA @ 21 V	1.1 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3
TZMC27-GS08	Vishay General Semiconductor	27	±5%	500	80	100 nA @ 20 V	1.5 V @ 200 mA	-65 to 175	SOD-80	Active	ROHS3

Engineering Selection Recommendations

Tier 1 – Direct Electrical and Mechanical Equivalents:

The TZM5254B-GS08 and TZM5254B-GS18 (Vishay General Semiconductor) are the closest functional equivalents to the DL5254B-TP. These parts match all critical electrical parameters: 27 V nominal zener voltage, ±5% tolerance, 500 mW power rating, 41 Ohms impedance, 100 nA reverse leakage current, and 1.1 V forward voltage at 200 mA. Both maintain the -65°C to 175°C operating temperature range and are packaged in SOD-80 Mini MELF form factor. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. TZM5254B-GS08 has 12,625 units in stock; TZM5254B-GS18 has 1,163 units available.

Tier 2 – Electrical Equivalents with Package Variation:

The MMSZ5254B-TP (Micro Commercial Co) provides electrical equivalence with identical zener voltage, tolerance, power rating, and impedance specifications. This part is active with extensive inventory (48,686 units). The primary difference is the SOD-123 surface mount package, which has different footprint geometry compared to the Mini MELF package. Operating temperature range is reduced to -55°C to 150°C. Forward voltage is specified at 900 mV @ 10 mA rather than 1.1 V @ 200 mA, representing a different measurement condition.

Tier 3 – Electrical Equivalents with Parameter Deviations:

The TLZ27B-GS08, TLZ27B-GS18, TLZ27C-GS08, TLZ27C-GS18, and TLZ27D-GS08 (Vishay General Semiconductor) maintain 27 V zener voltage and 500 mW power rating in SOD-80 Mini MELF packages with full -65°C to 175°C temperature range. These parts exhibit higher impedance (45 Ohms vs. 41 Ohms), lower reverse leakage current (40 nA vs. 100 nA), and higher forward voltage (1.5 V vs. 1.1 V). These deviations are within acceptable ranges for most voltage regulation and protection applications but require circuit validation for precision reference applications.

Tier 4 – Alternative with Automotive Qualification:

The TZMC27-GS08 (Vishay General Semiconductor) is AEC-Q101 qualified for automotive applications. It maintains 27 V zener voltage and ±5% tolerance but exhibits higher impedance (80 Ohms) and forward voltage (1.5 V @ 200 mA). This part is suitable for designs requiring automotive-grade components with extended environmental qualification.

Tier 5 – RoHS Non-Compliant Alternative:

The 1N5254BUR-1 (Microchip Technology) provides exact electrical and thermal specifications matching the DL5254B-TP but is RoHS non-compliant. This part is active with 706 units in stock and packaged in DO-213AA. Selection of this part requires explicit design approval for RoHS exemption or legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the MMSZ5254B-TP replace the DL5254B-TP directly on the PCB?

A: The MMSZ5254B-TP is electrically equivalent but uses a different surface mount package (SOD-123 vs. Mini MELF). PCB footprint modification is required. The part is functionally suitable for the same circuit applications.

Q: What is the difference between the TZM5254B variants and the TLZ27B variants?

A: The TZM5254B series matches the DL5254B-TP impedance specification (41 Ohms) and reverse leakage current (100 nA @ 21 V). The TLZ27B series has higher impedance (45 Ohms) and lower reverse leakage (40 nA @ 23.7 V). For precision voltage reference circuits, TZM5254B is preferred. For general protection applications, both are acceptable.

Q: Why does the TZMC27-GS08 have 80 Ohms impedance instead of 41 Ohms?

A: The TZMC27-GS08 is designed for automotive applications with AEC-Q101 qualification. The higher impedance is a characteristic of automotive-grade zener diodes and does not prevent functional substitution in most circuits, but circuit performance should be validated.

Q: Is the 1N5254BUR-1 suitable for new designs?

A: The 1N5254BUR-1 is RoHS non-compliant. It is suitable only for legacy system support or applications with explicit RoHS exemption approval. For new designs, select from ROHS3-compliant alternatives.

Q: What is the difference between GS08 and GS18 packaging designations?

A: GS08 and GS18 refer to different tape reel configurations for automated assembly. GS08 uses 8mm tape; GS18 uses 18mm tape. Electrical specifications are identical. Selection depends on assembly equipment compatibility.

Q: Can I use the TLZ27D-GS08 in a circuit designed for the DL5254B-TP?

A: The TLZ27D-GS08 is functionally compatible with identical zener voltage (27 V) and power rating (500 mW). The higher impedance (45 Ohms vs. 41 Ohms) and forward voltage (1.5 V vs. 1.1 V) may affect circuit performance in precision applications. Circuit simulation or bench testing is recommended for voltage regulation and reference circuits.

Q: What is the operating temperature advantage of the DL5254B-TP compared to the MMSZ5254B-TP?

A: The DL5254B-TP operates from -65°C to 175°C, while the MMSZ5254B-TP operates from -55°C to 150°C. The DL5254B-TP provides 10°C lower minimum temperature and 25°C higher maximum temperature capability. For applications requiring extended temperature range, the TZM5254B or TLZ27 series in Mini MELF packages maintain the full -65°C to 175°C range.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts except the 1N5254BUR-1 are ROHS3 compliant. The 1N5254BUR-1 is RoHS non-compliant and requires design approval for use in RoHS-regulated applications.

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