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

Taiwan Semiconductor Corporation 1PGSMB5945H

Name: 1PGSMB5945H
Brand: Taiwan Semiconductor Corporation
SKU: 1PGSMB5945H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1PGSMB5945H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AA, SMB

Datasheet:: 1PGSMB5945H.pdf

Description:: DIODE ZENER 68V 3W DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:4,038

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Product details

Overview

1PGSMB5945H from Taiwan Semiconductor is a surface-mount silicon Zener diode with nominal zener voltage 68 V, 3 W power rating, 5.5 mA test current, and DO-214AA (SMB) package. It provides precise voltage regulation and reference in automotive and industrial power supply circuits where stable clamping at 68 V is required.

For engineers reviewing the 1PGSMB5945H datasheet, 1PGSMB5945H pinout, 1PGSMB5945H application, or 1PGSMB5945H equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (R_θJA = 59 °C/W), junction temperature limit (175 °C), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 68 V reference across load variations. Its photo-glass passivated junction ensures long-term stability and low leakage (<1 μA at 51.7 V), while low inductance supports fast transient response in protection circuits.

The device is rated for continuous DC power dissipation of 3 W at lead temperature ≤75 °C, with thermal derating above that point. Its DO-214AA package enables automated placement and meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (Nominal)	68 V - Stable regulation voltage under 5.5 mA test current, ±5% tolerance
P_tot	3 W - Maximum continuous power dissipation at T_L = 75 °C on 10 mm × 10 mm Cu pad
I_ZT	5.5 mA - Test current defining nominal V_Z; used for production binning and calibration
Z_ZT	1700 Ω - Dynamic impedance at I_ZT, indicating voltage regulation stiffness under small-signal AC conditions
T_J max	175 °C - Maximum junction temperature enabling operation in under-hood or high-ambient industrial environments
R_θJA	59 °C/W - Junction-to-ambient thermal resistance on standard PCB layout; determines heatsinking needs
I_R @ V_R	<1 μA at 51.7 V - Low leakage ensures minimal standby current in voltage reference circuits

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode indicated by a band on the body. Matte tin-plated leads comply with J-STD-002 solderability standards. Weight: ~0.100 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reference ground node in shunt regulator	Connected to lower-potential side of circuit; defines polarity for reverse-bias operation
Cathode	Zener breakdown terminal / Voltage clamp output	Connected to regulated node; maintains 68 V relative to anode when reverse biased above V_Z

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control units and ADAS power rails
Photo-glass passivated junction	Enhances long-term parameter stability and reduces surface leakage under humidity stress
Low inductance	Supports effective transient voltage suppression in fast-switching power converters
Moisture sensitivity level 1	Enables direct use without baking prior to reflow, reducing manufacturing overhead
Halogen-free per IEC 61249-2-21	Complies with environmental regulations for RoHS-compliant industrial and automotive end equipment

Applications

Automotive Power Rail Clamping	Industrial Voltage Reference
Use Scenario: Protecting 60 V-rated CAN transceivers and microcontrollers from load-dump transients in 48 V vehicle architectures. IC Role / Device Role / Timing Role: Shunt clamping device limiting rail voltage to 68 V during ISO 7637-2 pulse 5a events. Use Value: Prevents overvoltage damage without requiring active control; leverages 175 °C T_J max for under-hood deployment.	Use Scenario: Providing stable 68 V reference for analog-to-digital converter biasing in programmable logic controllers. IC Role / Device Role / Timing Role: Precision voltage reference source with <1 μA leakage ensuring minimal error contribution. Use Value: Enables accurate 16-bit ADC full-scale calibration using 1PGSMB5945H's tight ±5% V_Z tolerance.
DC-DC Converter Feedback Clamp	Overvoltage Protection in Telecom PSU
Use Scenario: Secondary-side overvoltage clamp in isolated flyback converters delivering 60 V output. IC Role / Device Role / Timing Role: Fail-safe shunt element triggering crowbar or shutdown when feedback loop fails. Use Value: 3 W power rating sustains short-duration overvoltage without thermal runaway; DO-214AA allows compact board layout.	Use Scenario: Input-stage overvoltage protection in 48 V telecom rectifier modules subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device absorbing surge energy before downstream MOSFETs. Use Value: Low R_θJA (59 °C/W) enables rapid heat dissipation during repetitive 10/1000 μs transients.

Automotive Power Rail Clamping

Industrial Voltage Reference

Use Scenario: Protecting 60 V-rated CAN transceivers and microcontrollers from load-dump transients in 48 V vehicle architectures.

IC Role / Device Role / Timing Role: Shunt clamping device limiting rail voltage to 68 V during ISO 7637-2 pulse 5a events.

Use Value: Prevents overvoltage damage without requiring active control; leverages 175 °C T_J max for under-hood deployment.

Use Scenario: Providing stable 68 V reference for analog-to-digital converter biasing in programmable logic controllers.

IC Role / Device Role / Timing Role: Precision voltage reference source with <1 μA leakage ensuring minimal error contribution.

Use Value: Enables accurate 16-bit ADC full-scale calibration using 1PGSMB5945H's tight ±5% V_Z tolerance.

DC-DC Converter Feedback Clamp

Overvoltage Protection in Telecom PSU

Use Scenario: Secondary-side overvoltage clamp in isolated flyback converters delivering 60 V output.

IC Role / Device Role / Timing Role: Fail-safe shunt element triggering crowbar or shutdown when feedback loop fails.

Use Value: 3 W power rating sustains short-duration overvoltage without thermal runaway; DO-214AA allows compact board layout.

Use Scenario: Input-stage overvoltage protection in 48 V telecom rectifier modules subjected to lightning-induced surges.

IC Role / Device Role / Timing Role: Primary clamping device absorbing surge energy before downstream MOSFETs.

Use Value: Low R_θJA (59 °C/W) enables rapid heat dissipation during repetitive 10/1000 μs transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ68A	68 V, 600 W peak power, unidirectional TVS; higher clamping voltage (V_C = 111 V), not precision-regulated	Better for surge suppression; unsuitable for reference use due to wide V_C–V_BR spread	Select 1PGSMB5945H when stable DC regulation is required; choose SMBJ68A only for transient-only protection
1N5365B	68 V, 5 W, DO-204AL (DO-41); higher leakage (5 μA), no AEC-Q101 qualification	Lower cost for non-automotive consumer applications; lacks automotive reliability validation	Prefer 1PGSMB5945H for automotive or high-reliability industrial use; 1N5365B acceptable for cost-sensitive commercial designs

Compared with SMBJ68A and 1N5365B, the 1PGSMB5945H uniquely combines AEC-Q101 qualification, ±5% V_Z tolerance, and low leakage (<1 μA) in a surface-mount SMB package-making it optimal for precision voltage reference and automotive clamping where both accuracy and reliability are mandatory.

Availability

1PGSMB5945H is available at Aetrix Electronics and suitable for automotive power rail clamping, industrial voltage reference, and DC-DC converter feedback clamp applications requiring stable component supply and AEC-Q101 compliance.

Supply support for 1PGSMB5945H 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, ESD protection, and analog ICs for automotive and industrial markets.

The 1PGSMB59xxH series was designed specifically for high-reliability voltage regulation and clamping in automotive electronics, emphasizing AEC-Q101 qualification, thermal robustness, and surface-mount manufacturability.

FAQ

What is the nominal zener voltage and tolerance of the 1PGSMB5945H?

The 1PGSMB5945H has a nominal zener voltage of 68 V with a tolerance of ±5%, meaning its actual V_Z falls between 64.6 V and 71.4 V when measured at I_ZT = 5.5 mA and T_A = 25 °C. This tight tolerance makes the 1PGSMB5945H suitable for precision reference applications where consistent clamping voltage is critical.

Is the 1PGSMB5945H qualified for automotive applications?

Yes, the 1PGSMB5945H is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control units, body electronics, and ADAS power supplies. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life-ensuring reliability in demanding vehicular environments.

What is the maximum power dissipation and thermal derating behavior of the 1PGSMB5945H?

The 1PGSMB5945H is rated for 3 W total power dissipation at lead temperature (T_L) ≤75 °C on a 10 mm × 10 mm copper pad. Above 75 °C, power must be linearly derated at 33 mW/°C, reaching zero at 175 °C junction temperature. This derating curve is defined in the absolute maximum ratings table and verified per JEDEC standards.

Does the 1PGSMB5945H have low leakage current, and what is its value?

Yes, the 1PGSMB5945H exhibits very low reverse leakage: less than 1 μA at 51.7 V (80% of nominal V_Z). This low leakage minimizes error in precision reference circuits and reduces standby power loss in battery-backed systems-key advantages over generic Zener diodes with leakage >5 μA.

What package type does the 1PGSMB5945H use, and is it compatible with automated assembly?

The 1PGSMB5945H uses the DO-214AA (SMB) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability requirements. Its standardized footprint and moisture sensitivity level 1 (per J-STD-020) enable direct placement into reflow processes without pre-baking-fully supporting high-volume automated assembly lines.

1PGSMB5945H 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):: 68 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 120 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 51.7 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)

1PGSMB5945H FAQ

1.How can I place an order for 1PGSMB5945H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1PGSMB5945H 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 1PGSMB5945H reliable?

The price and inventory of 1PGSMB5945H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PGSMB5945H is usually 5 days.

3.What payment methods are accepted for 1PGSMB5945H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PGSMB5945H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1PGSMB5945H?

1PGSMB5945H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1PGSMB5945H 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 1PGSMB5945H?

For technical support, including 1PGSMB5945H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PGSMB5945H requirements.

6.How does Aetrix verify that 1PGSMB5945H is sourced from the original manufacturer or authorized distributors?

All 1PGSMB5945H 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 1PGSMB5945H meets industry standards.

7.What is the process for return or replacement of 1PGSMB5945H?

All 1PGSMB5945H units undergo pre-shipment inspection (PSI). If there is an issue with 1PGSMB5945H, 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 1PGSMB5945H part is unused and in its original packaging.

Return procedure for 1PGSMB5945H:

1.Submit a request within 90 days.

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

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