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

Taiwan Semiconductor Corporation 1PGSMB5951

Name: 1PGSMB5951
Brand: Taiwan Semiconductor Corporation
SKU: 1PGSMB5951
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1PGSMB5951

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AA, SMB

Datasheet:: 1PGSMB5951.pdf

Description:: DIODE ZENER 120V 3W DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:3,588

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Product details

Overview

1PGSMB5951 from Taiwan Semiconductor is a surface-mount 120 V nominal Zener diode in DO-214AA (SMB) package, rated for 3 W total power dissipation, with 5% voltage tolerance (114–126 V), 3.1 mA test current, and maximum DC zener current of 12 mA. It serves as a precision voltage reference or overvoltage clamp in high-voltage DC/DC converters.

For engineers reviewing the 1PGSMB5951 datasheet, 1PGSMB5951 pinout, 1PGSMB5951 application, or 1PGSMB5951 equivalent, key selection criteria include its 120 V nominal Zener voltage, 3.1 mA I_ZT, 4500 Ω dynamic impedance at I_ZK, 0.25 μA leakage at 91.2 V, and thermal resistance R_θJA = 59 °C/W on standard PCB mounting.

Technical Context

The 1PGSMB5951 operates as a single-die, unidirectional Zener diode with photo-glass passivated junction for stable breakdown characteristics under transient stress. Its 120 V nominal Zener voltage is specified at 3.1 mA test current, with dynamic impedance of 4500 Ω at knee current (I_ZK = 0.25 mA) and leakage current ≤0.25 μA at 91.2 V (80% of V_Z).

Designed for surface-mount assembly on standard FR-4 PCBs, it meets J-STD-020 moisture sensitivity level 1, JESD 201 Class 2 whisker resistance, and UL 94V-0 flammability rating. Polarity is indicated by cathode band; terminals are matte tin-plated for reliable solderability per J-STD-002.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (Nominal)	120 V - precise clamping/reference voltage at 3.1 mA test current
V_Z Range	114–126 V - ±5% tolerance ensures predictable regulation window
I_ZT	3.1 mA - standardized test current for V_Z measurement and datasheet compliance
P_tot	3 W - maximum continuous power dissipation at T_L = 75°C on 10 mm × 10 mm Cu pad
R_θJA	59 °C/W - thermal resistance to ambient enables thermal design on standard PCB layout
I_ZM	12 mA - maximum DC zener current before exceeding safe operating area
I_R @ V_R	≤0.25 μA @ 91.2 V - ultra-low leakage preserves efficiency in high-impedance bias networks

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode identified by molded band. Dimensions conform to JEDEC DO-214AA standard; recommended pad layout provided in manufacturer's package drawing.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during reverse breakdown	Connected to lower-potential node in clamping or reference circuit
Cathode	Current exit point during reverse breakdown	Marked with band; connected to higher-potential node (e.g., supply rail)

Key Features

Feature	Design Value
Photo-glass passivated junction	Ensures long-term stability and low parameter drift under thermal cycling and humidity exposure
Low inductance construction	Minimizes voltage overshoot during fast transients in SMPS snubber and protection circuits
J-STD-020 Level 1 moisture sensitivity	Enables direct placement without baking; supports standard SMT reflow profiles
RoHS & halogen-free compliance	Fulfills IPC-1752 and IEC 61249-2-21 requirements for environmentally regulated end equipment
UL 94V-0 molding compound	Provides flame-retardant encapsulation essential for safety-critical power supplies and lighting

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Voltage clamping of MOSFET drain spikes in flyback or forward converter primary-side snubbers. IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting switching transistor from inductive kickback. Use Value: 120 V nominal Zener voltage aligns with 100 V-rated MOSFETs; 3 W rating handles repetitive energy pulses without derating.	Use Scenario: Precision reference for feedback loop in isolated 48 V-to-12 V DC/DC modules. IC Role / Device Role / Timing Role: Stable voltage reference source for optocoupler-based error amplification. Use Value: Tight 5% tolerance and low leakage (<0.25 μA) maintain regulation accuracy across temperature and load conditions.
Lighting Application	Adapters
Use Scenario: Overvoltage protection in LED driver IC input stage against line surges. IC Role / Device Role / Timing Role: Transient voltage suppressor safeguarding driver IC supply pins. Use Value: 175 °C max junction temperature and robust glass-passivation withstand repeated surge events in outdoor lighting.	Use Scenario: Secondary-side voltage regulation in universal-input AC/DC wall adapters. IC Role / Device Role / Timing Role: Shunt regulator providing stable bias for TL431 or optocoupler circuitry. Use Value: DO-214AA package enables automated placement; 3 W rating supports sustained regulation under no-load and light-load conditions.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Voltage clamping of MOSFET drain spikes in flyback or forward converter primary-side snubbers.

IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting switching transistor from inductive kickback.

Use Value: 120 V nominal Zener voltage aligns with 100 V-rated MOSFETs; 3 W rating handles repetitive energy pulses without derating.

Use Scenario: Precision reference for feedback loop in isolated 48 V-to-12 V DC/DC modules.

IC Role / Device Role / Timing Role: Stable voltage reference source for optocoupler-based error amplification.

Use Value: Tight 5% tolerance and low leakage (<0.25 μA) maintain regulation accuracy across temperature and load conditions.

Lighting Application

Adapters

Use Scenario: Overvoltage protection in LED driver IC input stage against line surges.

IC Role / Device Role / Timing Role: Transient voltage suppressor safeguarding driver IC supply pins.

Use Value: 175 °C max junction temperature and robust glass-passivation withstand repeated surge events in outdoor lighting.

Use Scenario: Secondary-side voltage regulation in universal-input AC/DC wall adapters.

IC Role / Device Role / Timing Role: Shunt regulator providing stable bias for TL431 or optocoupler circuitry.

Use Value: DO-214AA package enables automated placement; 3 W rating supports sustained regulation under no-load and light-load conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ120A	TVS diode (unidirectional), 120 V standoff, 192 V clamping, 600 W peak pulse power	Designed for transient suppression, not precision DC regulation	Select when surge immunity > regulation accuracy is required; not suitable for reference use
1N5375B	Through-hole DO-201AD package, same 120 V nominal, 5 W rating, higher leakage (10 μA @ 96 V)	Requires wave soldering or hand assembly; less suitable for high-density SMT layouts	Select only if through-hole assembly is mandated; otherwise prefer 1PGSMB5951 for SMT scalability and lower leakage

Compared with SMBJ120A and 1N5375B, the 1PGSMB5951 delivers superior DC regulation stability and lower leakage in compact SMB packaging-making it optimal for precision shunt references and clamping where steady-state accuracy matters more than transient energy handling.

Availability

1PGSMB5951 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, RoHS-compliant sourcing, and consistent DO-214AA tape-and-reel delivery.

Supply support for 1PGSMB5951 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power management and protection markets since 1979.

The 1PGSMB59xx series is part of TSC's high-voltage Zener diode product line, engineered specifically for reliable voltage regulation and clamping in space-constrained, high-efficiency power conversion systems.

FAQ

What is the nominal Zener voltage of the 1PGSMB5951?

The 1PGSMB5951 has a nominal Zener voltage of 120 V, with a guaranteed range of 114 V to 126 V (±5% tolerance) measured at 3.1 mA test current (I_ZT). This value is specified under thermal equilibrium at 25°C ambient and reflects the device's primary function as a stable voltage reference or clamp in high-voltage circuits.

What is the maximum power dissipation rating for the 1PGSMB5951?

The 1PGSMB5951 is rated for 3 W total power dissipation at lead temperature (T_L) of 75°C, with linear derating above that temperature. On a standard 10 mm × 10 mm copper pad PCB, its junction-to-ambient thermal resistance is 59 °C/W, enabling reliable operation up to 175°C junction temperature in properly heatsinked designs.

Does the 1PGSMB5951 meet RoHS and halogen-free requirements?

Yes, the 1PGSMB5951 complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability standards, and terminals are matte tin-plated to ensure solderability and environmental compliance in commercial and industrial end products.

What is the leakage current specification for the 1PGSMB5951?

The 1PGSMB5951 exhibits ≤0.25 μA leakage current at 91.2 V (80% of nominal V_Z), ensuring minimal parasitic current draw in high-impedance reference or bias networks. This low leakage supports accurate regulation in battery-powered or energy-sensitive applications where standby power loss must be minimized.

What package type does the 1PGSMB5951 use, and is it compatible with automated assembly?

The 1PGSMB5951 uses the DO-214AA (SMB) surface-mount package and is fully compatible with automated pick-and-place equipment. It carries J-STD-020 moisture sensitivity level 1, eliminating the need for pre-baking, and features matte tin-plated leads compliant with J-STD-002 for robust solder joint formation in standard reflow profiles.

1PGSMB5951 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):: 120 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 360 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 91.2 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)

1PGSMB5951 FAQ

1.How can I place an order for 1PGSMB5951 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1PGSMB5951 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 1PGSMB5951 reliable?

The price and inventory of 1PGSMB5951 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PGSMB5951 is usually 5 days.

3.What payment methods are accepted for 1PGSMB5951?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PGSMB5951 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1PGSMB5951?

1PGSMB5951 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1PGSMB5951 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 1PGSMB5951?

For technical support, including 1PGSMB5951 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PGSMB5951 requirements.

6.How does Aetrix verify that 1PGSMB5951 is sourced from the original manufacturer or authorized distributors?

All 1PGSMB5951 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 1PGSMB5951 meets industry standards.

7.What is the process for return or replacement of 1PGSMB5951?

All 1PGSMB5951 units undergo pre-shipment inspection (PSI). If there is an issue with 1PGSMB5951, 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 1PGSMB5951 part is unused and in its original packaging.

Return procedure for 1PGSMB5951:

1.Submit a request within 90 days.

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

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