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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Taiwan Semiconductor Corporation 1PGSMB5943

Name: 1PGSMB5943
Brand: Taiwan Semiconductor Corporation
SKU: 1PGSMB5943
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1PGSMB5943

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AA, SMB

Datasheet:: 1PGSMB5943.pdf

Description:: DIODE ZENER 56V 3W DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:5,993

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Product details

Overview

1PGSMB5943 from Taiwan Semiconductor is a surface-mount Zener diode with a nominal zener voltage of 56 V (±5%), 3 W power dissipation, and DO-214AA (SMB) package. It operates across -55°C to +175°C junction temperature, exhibits 1300 Ω dynamic impedance at 6.7 mA test current, and delivers stable voltage regulation in DC/DC converters and SMPS feedback loops.

For engineers reviewing the 1PGSMB5943 datasheet, 1PGSMB5943 pinout, 1PGSMB5943 application, or 1PGSMB5943 equivalent, key selection criteria include its 56 V nominal zener voltage, 27 mA maximum DC zener current, 42.6 V minimum zener voltage at IZT, 1300 Ω Zener impedance, and SMB package thermal performance (RθJA = 59 °C/W on 10 mm × 10 mm Cu pad).

Technical Context

This single-die Zener diode uses photo-glass passivated junction technology for stable breakdown characteristics and low leakage. Its 1300 Ω dynamic impedance at 6.7 mA and 0.25 μA leakage at 42.6 V ensure precise regulation under light-load conditions.

Designed for high-reliability surface-mount applications, it meets JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 flammability requirements - enabling automated placement without reflow degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (Nominal)	56 V ±5% - defines primary regulation setpoint in feedback networks
I_ZT	6.7 mA - test current at which V_Z and Z_ZT are specified
Z_ZT	1300 Ω - dynamic impedance affecting regulation accuracy under varying load
P_tot	3 W - maximum steady-state power dissipation at T_L = 75°C
T_J max	+175°C - enables operation in high-temperature industrial environments
R_θJA	59 °C/W - thermal resistance to ambient on standard 10 mm × 10 mm PCB copper pad
I_ZM	27 mA - maximum DC zener current before thermal runaway risk

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode indicated by band. Matte tin-plated leads, solderable per J-STD-002.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-voltage reference node	Connected to ground or lower-potential rail in reverse-biased regulation configuration
Cathode	Zener breakdown terminal / regulated output node	Provides stable 56 V reference when reverse-biased above V_Z; marked with band

Key Features

Feature	Design Value
Photo-glass passivated junction	Ensures long-term stability and low parameter drift under thermal cycling
Low inductance construction	Minimizes voltage overshoot during transient load steps in switching regulators
J-STD-020 Level 1 moisture sensitivity	Eliminates bake requirement prior to reflow, reducing manufacturing cost and risk
UL 94V-0 molding compound	Meets flame-retardancy requirements for safety-critical power supplies
RoHS and halogen-free compliance	Supports environmental compliance for global industrial and consumer deployments

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Primary-side overvoltage protection and secondary-side feedback reference in isolated flyback converters. IC Role / Device Role / Timing Role: Zener reference element in TL431-based optocoupler feedback loop. Use Value: 56 V nominal breakdown provides precise trip point for 48 V output overvoltage protection with <±5% tolerance.	Use Scenario: Voltage clamping and regulation in point-of-load (POL) buck converter auxiliary rails. IC Role / Device Role / Timing Role: Standby rail voltage reference for microcontroller reset circuitry. Use Value: Stable 56 V regulation ensures reliable reset assertion across -40°C to +125°C ambient with R_θJA = 59 °C/W.
Lighting Application	Adapter
Use Scenario: Overvoltage clamp in LED driver constant-current control circuits. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting MOSFET gate drivers from inductive kick. Use Value: 3 W power rating handles repetitive 100 ns–1 μs transients without degradation; 175°C T_J max supports enclosed luminaire environments.	Use Scenario: Output voltage regulation and line transient suppression in wall-mounted AC/DC adapters. IC Role / Device Role / Timing Role: Secondary-side shunt regulator stabilizing 56 V auxiliary bias supply. Use Value: 1300 Ω Z_ZT ensures <1% output variation across 1–27 mA load range, critical for adapter no-load efficiency.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Primary-side overvoltage protection and secondary-side feedback reference in isolated flyback converters.

IC Role / Device Role / Timing Role: Zener reference element in TL431-based optocoupler feedback loop.

Use Value: 56 V nominal breakdown provides precise trip point for 48 V output overvoltage protection with <±5% tolerance.

Use Scenario: Voltage clamping and regulation in point-of-load (POL) buck converter auxiliary rails.

IC Role / Device Role / Timing Role: Standby rail voltage reference for microcontroller reset circuitry.

Use Value: Stable 56 V regulation ensures reliable reset assertion across -40°C to +125°C ambient with R_θJA = 59 °C/W.

Lighting Application

Adapter

Use Scenario: Overvoltage clamp in LED driver constant-current control circuits.

IC Role / Device Role / Timing Role: Transient voltage suppressor protecting MOSFET gate drivers from inductive kick.

Use Value: 3 W power rating handles repetitive 100 ns–1 μs transients without degradation; 175°C T_J max supports enclosed luminaire environments.

Use Scenario: Output voltage regulation and line transient suppression in wall-mounted AC/DC adapters.

IC Role / Device Role / Timing Role: Secondary-side shunt regulator stabilizing 56 V auxiliary bias supply.

Use Value: 1300 Ω Z_ZT ensures <1% output variation across 1–27 mA load range, critical for adapter no-load efficiency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5943B	Same 56 V nominal V_Z, but 1.5 W P_tot and DO-41 through-hole package	Not suitable for high-density SMT layouts; requires PCB hole drilling and wave soldering	Select only if legacy through-hole assembly is mandated and thermal budget allows derating
SMBJ56A	56 V standoff voltage, but TVS diode (not Zener); 600 W peak pulse power, higher leakage	Designed for ESD/transient suppression, not precision DC regulation	Use only for surge protection; avoid in feedback or reference roles due to non-regulating behavior

Compared with 1N5943B and SMBJ56A, the 1PGSMB5943 uniquely combines SMT-compatible DO-214AA packaging, 3 W continuous dissipation, and tight 5% V_Z tolerance - making it optimal for space-constrained, thermally demanding DC regulation where precision and manufacturability are jointly critical.

Availability

1PGSMB5943 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full traceability and lifecycle support.

Supply support for 1PGSMB5943 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, including Zener, Schottky, and TVS diodes, with global distribution and AEC-Q200 qualified products.

The 1PGSMB59xx family was designed specifically for high-reliability surface-mount voltage regulation in industrial power conversion systems, emphasizing thermal robustness, automated assembly compatibility, and tight parametric control.

FAQ

What is the nominal zener voltage and tolerance of the 1PGSMB5943?

The 1PGSMB5943 has a nominal zener voltage of 56 V with a tolerance of ±5%, corresponding to a guaranteed range of 53.2 V to 58.8 V at 6.7 mA test current and 25°C ambient. This tolerance is confirmed in the Electrical Specifications table and applies to all units within the 1PGSMB5943 orderable part number. The 1PGSMB5943 achieves this via photo-glass passivation and tight process control during wafer fabrication.

What is the maximum DC zener current (I_ZM) for the 1PGSMB5943?

The maximum DC zener current for the 1PGSMB5943 is 27 mA, as specified in the Electrical Specifications table. Exceeding this value risks thermal runaway due to the device's 3 W total power dissipation limit and 59 °C/W junction-to-ambient thermal resistance. The 1PGSMB5943 must be used with appropriate series limiting resistors to maintain I_Z ≤ 27 mA under worst-case input conditions.

Does the 1PGSMB5943 have RoHS and halogen-free compliance?

Yes, the 1PGSMB5943 is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official Taiwan Semiconductor documentation. This compliance is verified through material declarations and third-party testing, and applies to all production lots of the 1PGSMB5943 shipped since Version C2102 release.

What is the thermal resistance from junction to ambient (R_θJA) for the 1PGSMB5943?

The junction-to-ambient thermal resistance (R_θJA) of the 1PGSMB5943 is 59 °C/W, measured on a standard 10 mm × 10 mm copper pad PCB per JEDEC test conditions. This value assumes zero lead length and natural convection; actual R_θJA may improve with larger copper areas or forced airflow. The 1PGSMB5943 leverages this thermal performance to sustain 3 W dissipation up to 75°C lead temperature.

What marking code identifies the 1PGSMB5943 on the device body?

The 1PGSMB5943 is marked with the code "P943B" on its package body, as shown in the Marking Diagram and Electrical Specifications table. This 5-character alphanumeric code is laser-etched or printed on the cathode-band side of the DO-214AA (SMB) case and serves as the unique visual identifier for traceability and inspection. No other marking variant is assigned to the 1PGSMB5943.

1PGSMB5943 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: 1PGSMB59

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 56 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 86 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 42.6 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

1PGSMB5943 FAQ

1.How can I place an order for 1PGSMB5943 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1PGSMB5943 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 1PGSMB5943 reliable?

The price and inventory of 1PGSMB5943 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PGSMB5943 is usually 5 days.

3.What payment methods are accepted for 1PGSMB5943?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PGSMB5943 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1PGSMB5943?

1PGSMB5943 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1PGSMB5943 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 1PGSMB5943?

For technical support, including 1PGSMB5943 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PGSMB5943 requirements.

6.How does Aetrix verify that 1PGSMB5943 is sourced from the original manufacturer or authorized distributors?

All 1PGSMB5943 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1PGSMB5943 meets industry standards.

7.What is the process for return or replacement of 1PGSMB5943?

All 1PGSMB5943 units undergo pre-shipment inspection (PSI). If there is an issue with 1PGSMB5943, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 1PGSMB5943 part is unused and in its original packaging.

Return procedure for 1PGSMB5943:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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