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

Taiwan Semiconductor Corporation 1PGSMB5931H

Name: 1PGSMB5931H
Brand: Taiwan Semiconductor Corporation
SKU: 1PGSMB5931H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1PGSMB5931H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AA, SMB

Datasheet:: 1PGSMB5931H.pdf

Description:: DIODE ZENER 18V 3W DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:7,761

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Product details

Overview

1PGSMB5931H from Taiwan Semiconductor is a surface-mount silicon Zener diode with nominal zener voltage 18 V, 3 W power rating, 20.8 Ω dynamic impedance at 12 mA test current, and DO-214AA (SMB) package. It serves as a precision voltage reference and overvoltage protection device in automotive and industrial power rails.

For engineers reviewing the 1PGSMB5931H datasheet, 1PGSMB5931H pinout, 1PGSMB5931H application, or 1PGSMB5931H equivalent, key selection criteria include zener voltage tolerance (±5%), junction temperature range (–55°C to +175°C), thermal resistance (R_θJA = 59°C/W), AEC-Q101 qualification, and moisture sensitivity level 1 compliance.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations. Its photo-glass passivated junction ensures long-term stability and low leakage (<1 μA at 13.7 V), while the DO-214AA package supports automated placement and meets UL 94V-0 flammability requirements.

The device delivers regulated reference voltage under DC conditions with specified zener impedance (650 Ω at knee current), low inductance for fast transient response, and thermal performance validated on 10 mm × 10 mm copper PCB pads - enabling reliable operation in high-reliability automotive subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (Nominal)	18 V - precise regulation point for 12–24 V system references
I_ZT	12 mA - standard test current defining nominal V_Z and dynamic impedance
Z_ZT	20.8 Ω - low dynamic impedance ensures minimal voltage deviation under load changes
P_tot	3 W - maximum continuous dissipation at T_L = 75°C, derated above that temperature
T_J max	+175°C - enables use in under-hood automotive environments without thermal shutdown
R_θJA	59°C/W - thermal resistance measured on standard 10 mm × 10 mm Cu pad PCB
MSL	Level 1 per J-STD-020 - no floor life limitation; safe for reflow without baking

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode indicated by a band on the body. Matte tin-plated leads ensure solderability per J-STD-002; polarity-sensitive mounting required.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reference ground node	Connected to circuit ground or lower-potential rail during Zener operation
Cathode	Reverse-biased Zener terminal / Voltage regulation output	Connected to regulated node; voltage clamped to 18 V when reverse biased above V_Z

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control, lighting, and ADAS power domains
Photo-glass passivated junction	Enhances long-term voltage stability and reduces parameter drift over temperature and time
Low inductance construction	Supports effective transient suppression in fast-switching power supplies and ESD-critical interfaces
Moisture sensitivity level 1	Eliminates pre-bake requirement before SMT reflow, reducing manufacturing complexity
Halogen-free per IEC 61249-2-21	Complies with environmental regulations for RoHS-compliant industrial and automotive end equipment

Applications

Automotive Power Rail Protection	Industrial Sensor Reference
Use Scenario: Clamping transients on 12 V battery-fed ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp in parallel with LDO input. Use Value: Maintains <18.9 V clamping threshold under 12 mA test current, preventing downstream IC damage during 100 V/100 ms load dump events.	Use Scenario: Providing stable 18 V reference for analog front-end circuits in pressure and temperature sensors. IC Role / Device Role / Timing Role: Precision voltage reference source with ±5% tolerance and low tempco via passivated junction. Use Value: Enables <0.5% full-scale error in 16-bit ADC systems operating from –40°C to +125°C ambient.
LED Driver Overvoltage Clamp	Programmable Logic Supply Monitor
Use Scenario: Protecting constant-current LED drivers against bus overvoltage in commercial lighting fixtures. IC Role / Device Role / Timing Role: Shunt protection element placed across driver IC supply pins. Use Value: Limits peak voltage to 18.9 V max, preventing gate oxide stress in integrated MOSFETs within driver ICs.	Use Scenario: Monitoring 18 V auxiliary supply in FPGA-based control modules with brown-out detection. IC Role / Device Role / Timing Role: Reference voltage source for comparator-based undervoltage lockout (UVLO) circuit. Use Value: Delivers stable 18 V reference with <1 μA leakage at 13.7 V, ensuring accurate trip point across 10-year field life.

Automotive Power Rail Protection

Industrial Sensor Reference

Use Scenario: Clamping transients on 12 V battery-fed ECUs exposed to load dump and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp in parallel with LDO input.

Use Value: Maintains <18.9 V clamping threshold under 12 mA test current, preventing downstream IC damage during 100 V/100 ms load dump events.

Use Scenario: Providing stable 18 V reference for analog front-end circuits in pressure and temperature sensors.

IC Role / Device Role / Timing Role: Precision voltage reference source with ±5% tolerance and low tempco via passivated junction.

Use Value: Enables <0.5% full-scale error in 16-bit ADC systems operating from –40°C to +125°C ambient.

LED Driver Overvoltage Clamp

Programmable Logic Supply Monitor

Use Scenario: Protecting constant-current LED drivers against bus overvoltage in commercial lighting fixtures.

IC Role / Device Role / Timing Role: Shunt protection element placed across driver IC supply pins.

Use Value: Limits peak voltage to 18.9 V max, preventing gate oxide stress in integrated MOSFETs within driver ICs.

Use Scenario: Monitoring 18 V auxiliary supply in FPGA-based control modules with brown-out detection.

IC Role / Device Role / Timing Role: Reference voltage source for comparator-based undervoltage lockout (UVLO) circuit.

Use Value: Delivers stable 18 V reference with <1 μA leakage at 13.7 V, ensuring accurate trip point across 10-year field life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ18A	TVS diode (unidirectional), 18 V standoff, 28.2 V clamping at I_PP, higher capacitance (150 pF)	Designed for surge suppression (IEC 61000-4-5), not precision regulation	Select for transient-heavy environments where regulation accuracy is secondary to energy absorption
BZX84-C18	SOT-23 package, 18 V nominal, 300 mW rating, ±5% tolerance, R_θJA ≈ 300°C/W	Lower power handling and inferior thermal performance limits use to low-current bias/reference roles	Select only for space-constrained, low-power signal conditioning - not for 3 W automotive rails

Compared with SMBJ18A and BZX84-C18, the 1PGSMB5931H uniquely combines AEC-Q101 qualification, 3 W power capability, DO-214AA thermal robustness (R_θJA = 59°C/W), and tight 5% zener tolerance - making it the only suitable choice for high-reliability, medium-power voltage regulation in automotive and industrial systems.

Availability

1PGSMB5931H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor reference design, and LED driver protection requiring stable component supply and AEC-Q101 compliance.

Supply support for 1PGSMB5931H 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, analog ICs, and protection components for automotive and industrial markets.

The 1PGSMB59xxH series was designed specifically for AEC-Q101-compliant voltage regulation and overvoltage protection in harsh-environment automotive subsystems, emphasizing thermal reliability and process consistency.

FAQ

What is the exact zener voltage range for 1PGSMB5931H?

The 1PGSMB5931H has a guaranteed zener voltage range of 17.10 V (min) to 18.90 V (max) at 12 mA test current, with nominal value 18 V and ±5% tolerance. This range is verified per JEDEC JESD212 and applies under steady-state DC conditions at 25°C ambient. The 1PGSMB5931H maintains this specification across its rated junction temperature range of –55°C to +175°C.

Is 1PGSMB5931H suitable for automotive applications?

Yes, the 1PGSMB5931H is AEC-Q101 qualified and explicitly designed for automotive use. It meets stress test requirements for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life. Its DO-214AA package, photo-glass passivation, and MSL Level 1 rating support direct integration into engine control units, body electronics, and ADAS power domains without derating.

What is the maximum DC zener current (I_ZM) for 1PGSMB5931H?

The maximum DC zener current for 1PGSMB5931H is 83 mA, calculated from P_tot = 3 W and V_Z = 18 V (I_ZM = P_tot/V_Z). This value is confirmed in the Electrical Specifications table and assumes operation at T_L = 75°C on a 10 mm × 10 mm copper pad. Derating is required above 75°C per the power derating curve.

Does 1PGSMB5931H have halogen-free and RoHS compliance documentation?

Yes, the 1PGSMB5931H is RoHS compliant and halogen-free per IEC 61249-2-21. These declarations are stated in the official Taiwan Semiconductor datasheet (Version A2102) and supported by material declarations available through TSC's compliance portal. The molding compound meets UL 94V-0, and terminals are matte tin plated per J-STD-002.

How does the thermal resistance of 1PGSMB5931H compare to standard SMB packages?

The 1PGSMB5931H achieves R_θJA = 59°C/W on a 10 mm × 10 mm Cu pad - significantly better than typical SMB Zeners (often >80°C/W). This is enabled by optimized die attach and leadframe design. Its R_θJC = 23°C/W and R_θJL = 21°C/W confirm efficient heat transfer to PCB and leads, supporting sustained 3 W operation in compact automotive layouts.

1PGSMB5931H 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):: 18 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 12 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 13.7 V

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

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

1PGSMB5931H FAQ

1.How can I place an order for 1PGSMB5931H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1PGSMB5931H 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 1PGSMB5931H reliable?

The price and inventory of 1PGSMB5931H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PGSMB5931H is usually 5 days.

3.What payment methods are accepted for 1PGSMB5931H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PGSMB5931H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1PGSMB5931H?

1PGSMB5931H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1PGSMB5931H 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 1PGSMB5931H?

For technical support, including 1PGSMB5931H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PGSMB5931H requirements.

6.How does Aetrix verify that 1PGSMB5931H is sourced from the original manufacturer or authorized distributors?

All 1PGSMB5931H 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 1PGSMB5931H meets industry standards.

7.What is the process for return or replacement of 1PGSMB5931H?

All 1PGSMB5931H units undergo pre-shipment inspection (PSI). If there is an issue with 1PGSMB5931H, 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 1PGSMB5931H part is unused and in its original packaging.

Return procedure for 1PGSMB5931H:

1.Submit a request within 90 days.

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

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