TLZ47-GS18 Equivalent & Substitute Parts

Part Overview

The TLZ47-GS18 is an active-status Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component is a 47 V, 500 mW surface mount device in SOD-80 MiniMELF packaging, designed for voltage regulation and protection applications. The part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when the original part becomes unavailable, when inventory constraints exist, or when design flexibility permits equivalent component selection within specified electrical and mechanical parameters.

Substiute Parts

TLZ47-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 738TLZ47-GS18 Datasheet

Current PartRFQ

BZV55-B47,115

Nexperia USA Inc.In Stock: 3040BZV55-B47,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLZ47-GS18 is permitted with the BZV55-B47,115 based on the following electrical and mechanical equivalence criteria:

Matching Parameters:

• Zener voltage: 47 V nominal (both parts)
• Maximum power dissipation: 500 mW (both parts)
• Package type: DO-213AC, MINI-MELF, SOD-80 (both parts)
• Mounting type: Surface Mount (both parts)
• Operating temperature range: Both parts support -65°C minimum; substitute supports extended maximum of 200°C versus 175°C
• RoHS3 compliance: Both parts
• Moisture sensitivity: MSL 1 (Unlimited) for both parts

Allowable Parameter Variations:

• Impedance (Zzt): TLZ47-GS18 specifies 90 Ohms maximum; BZV55-B47,115 specifies 170 Ohms maximum. Higher impedance in substitute is acceptable for voltage regulation applications.
• Reverse leakage current: Measured at different reference voltages (41.8 V versus 32.9 V) with different specifications (40 nA versus 50 nA). Both values are within acceptable leakage parameters for this device class.
• Forward voltage: TLZ47-GS18 specifies 1.5 V @ 200 mA; BZV55-B47,115 specifies 900 mV @ 10 mA. Forward voltage characteristics differ due to measurement conditions but do not affect zener regulation function.
• Tolerance: BZV55-B47,115 includes ±2% tolerance specification; TLZ47-GS18 does not specify tolerance. This represents improved specification in the substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: TLZ47-GS18

The TLZ47-GS18 is the specified component with active product status and 721 units in current inventory. This part meets all design requirements for 47 V zener regulation with 500 mW power dissipation in surface mount SOD-80 packaging. ROHS3 compliance and MSL 1 rating confirm suitability for standard manufacturing and storage conditions.

Substitute Part: BZV55-B47,115

The BZV55-B47,115 manufactured by Nexperia USA Inc. is an active-status equivalent with 3017 units in inventory. This substitute maintains electrical equivalence across all critical parameters: 47 V nominal zener voltage, 500 mW maximum power, and identical package configuration. The substitute provides extended operating temperature range to 200°C and includes ±2% voltage tolerance specification. ROHS3 compliance and MSL 1 rating match the primary part. Selection of the substitute is appropriate when primary part availability is constrained or when the extended temperature range provides design margin.

Both parts are REACH unaffected and classified under ECCN EAR99 with identical HTSUS code 8541.10.0050.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B47,115 be used as a direct replacement for the TLZ47-GS18 in existing designs?

A: Yes. Both parts share identical zener voltage (47 V), maximum power rating (500 mW), and package configuration (SOD-80 MiniMELF). Electrical performance in voltage regulation applications is equivalent. The substitute operates across the same minimum temperature (-65°C) and extends to 200°C maximum versus 175°C for the primary part.

Q: What is the significance of the impedance difference between these parts?

A: The TLZ47-GS18 specifies 90 Ohms maximum impedance; the BZV55-B47,115 specifies 170 Ohms maximum. In zener diode applications, impedance affects voltage regulation quality under load changes. The higher impedance of the substitute represents a less stringent specification and is acceptable for standard voltage regulation circuits. Applications requiring impedance below 90 Ohms must use the primary part.

Q: Are the reverse leakage current specifications comparable?

A: The specifications are measured at different reference voltages (41.8 V for TLZ47-GS18 versus 32.9 V for BZV55-B47,115) and show different absolute values (40 nA versus 50 nA). These differences reflect different test methodologies rather than incompatibility. Both values are within acceptable leakage parameters for this device class and do not affect circuit performance in standard applications.

Q: Do both parts have identical moisture sensitivity requirements?

A: Yes. Both the TLZ47-GS18 and BZV55-B47,115 carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Both parts can be stored and handled under standard manufacturing conditions without special moisture control measures.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both carry identical HTSUS code 8541.10.0050. Regulatory and compliance status is equivalent.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. The TLZ47-GS18 is the specified primary component. The BZV55-B47,115 offers extended temperature range to 200°C and explicit ±2% voltage tolerance, which may provide design margin in temperature-sensitive or precision applications. Selection should be based on availability, cost, and specific application temperature requirements.