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

Taiwan Semiconductor Corporation 1SMA5948H

Name: 1SMA5948H
Brand: Taiwan Semiconductor Corporation
SKU: 1SMA5948H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMA5948H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: 1SMA5948H.pdf

Description:: DIODE ZENER 91V 1.5W DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:8,476

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Product details

Overview

1SMA5948H from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage of 91 V, 1.5 W power dissipation, and DO-214AC (SMA) package. It provides precise voltage regulation in DC/DC converters and SMPS feedback loops, featuring low leakage current (<0.5 µA at VR = 69.2 V), AEC-Q101 qualification, and glass-passivated junction for reliability.

For engineers reviewing the 1SMA5948H datasheet, 1SMA5948H pinout, 1SMA5948H application, or 1SMA5948H equivalent, key selection criteria include its ±5% V_Z tolerance (86.45–95.55 V), 4.1 Ω dynamic impedance at I_ZT = 4.1 mA, 3000 Ω knee impedance at I_ZK = 0.25 mA, and maximum DC zener current of 16 mA under thermal equilibrium conditions.

Technical Context

The 1SMA5948H operates as a single-die, unidirectional voltage reference device with cathode-band polarity indication. Its zener breakdown mechanism delivers stable regulation across -55°C to +150°C junction temperature range, supported by low-inductance construction and JEDEC Class 3B HBM ESD rating.

Designed for surface-mount automated placement, it uses matte tin-plated leads compliant with J-STD-002 solderability and meets UL 94V-0 flammability requirements. The DO-214AC package enables compact board layout while maintaining 1.5 W power handling at TL = 75°C with 20 mW/°C derating above that point.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z @ I_ZT	86.45–95.55 V (±5% tolerance at 4.1 mA test current)
P_D	1.5 W (maximum steady-state power dissipation at 75°C lead temperature)
Z_ZT @ I_ZT	4.1 Ω (dynamic impedance affecting regulation precision under load variation)
I_R @ V_R	<0.5 µA at 69.2 V (low leakage ensures minimal standby power loss)
T_J max	+150°C (enables operation in high-temperature industrial and automotive environments)
I_ZM	16 mA (maximum DC zener current defining safe continuous conduction limit)
AEC-Q101	Qualified (validates reliability for automotive electronic control units)

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-biased regulation mode
Cathode	Zener breakdown terminal	Connected to higher-potential node; voltage referenced to this pin during regulation

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock
Glass-passivated junction	Enhances long-term stability and reduces parameter drift under thermal stress
Low inductance construction	Minimizes voltage overshoot during fast transient events in switching regulators
JEDEC Class 3B HBM ESD rating	Withstands ≥8 kV human-body-model discharge without degradation
Moisture sensitivity level 1	Enables unlimited floor life before reflow; no baking required prior to assembly

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 voltage reference providing stable 91 V threshold for optocoupler-driven feedback loop. Use Value: Tight ±5% V_Z tolerance and low 4.1 Ω Z_ZT ensure accurate output voltage regulation across line/load variations.	Use Scenario: Input rail clamping and voltage supervision in point-of-load (POL) modules for FPGA or ASIC power domains. IC Role / Device Role / Timing Role: Standby-mode voltage clamp protecting downstream LDOs and PMICs from input surge. Use Value: 1.5 W power rating and 150°C T_J max support sustained operation in thermally constrained embedded PCB layouts.
Lighting Application	Adapter
Use Scenario: LED string open-circuit protection and constant-current source reference in AC/DC LED drivers. IC Role / Device Role / Timing Role: Precision shunt regulator setting current-sense threshold for linear or buck-based LED controllers. Use Value: Low 0.5 µA leakage at 69.2 V minimizes quiescent current in always-on lighting control circuits.	Use Scenario: Output voltage stabilization and overvoltage cutoff in wall-mounted AC/DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Secondary-side zener clamp limiting output excursion during load dump or feedback failure. Use Value: AEC-Q101 qualification and UL 94V-0 molding compound meet safety and reliability requirements for certified adapter designs.

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 voltage reference providing stable 91 V threshold for optocoupler-driven feedback loop.

Use Value: Tight ±5% V_Z tolerance and low 4.1 Ω Z_ZT ensure accurate output voltage regulation across line/load variations.

Use Scenario: Input rail clamping and voltage supervision in point-of-load (POL) modules for FPGA or ASIC power domains.

IC Role / Device Role / Timing Role: Standby-mode voltage clamp protecting downstream LDOs and PMICs from input surge.

Use Value: 1.5 W power rating and 150°C T_J max support sustained operation in thermally constrained embedded PCB layouts.

Lighting Application

Adapter

Use Scenario: LED string open-circuit protection and constant-current source reference in AC/DC LED drivers.

IC Role / Device Role / Timing Role: Precision shunt regulator setting current-sense threshold for linear or buck-based LED controllers.

Use Value: Low 0.5 µA leakage at 69.2 V minimizes quiescent current in always-on lighting control circuits.

Use Scenario: Output voltage stabilization and overvoltage cutoff in wall-mounted AC/DC adapters for consumer electronics.

IC Role / Device Role / Timing Role: Secondary-side zener clamp limiting output excursion during load dump or feedback failure.

Use Value: AEC-Q101 qualification and UL 94V-0 molding compound meet safety and reliability requirements for certified adapter designs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4749A	Same nominal V_Z (91 V), but ±5% tolerance only at 21 mA I_ZT; Z_ZT = 15 Ω; not AEC-Q101 qualified	General-purpose industrial use only; unsuitable for automotive systems requiring stress-tested components	Select 1SMA5948H when AEC-Q101 compliance and lower dynamic impedance are required for precision regulation.
BZX84-C91	SOT-23 package; V_Z = 91 V ±5% at 5 mA; Z_ZT = 120 Ω; P_D = 300 mW; not AEC-Q101 qualified	Limited to low-power signal-level clamping; cannot replace 1SMA5948H in 1.5 W power applications	Choose 1SMA5948H for surface-mount power regulation where thermal robustness and higher power handling are mandatory.

Compared with 1N4749A and BZX84-C91, the 1SMA5948H offers superior regulation accuracy (4.1 Ω vs. 15 Ω/120 Ω Z_ZT), automotive-grade qualification, and 5× higher power rating-making it the only viable option for thermally demanding, safety-critical 91 V reference applications.

Availability

1SMA5948H 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 automotive-grade reliability and consistent parametric performance.

Supply support for 1SMA5948H 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 with global distribution and AEC-Q101 validation capability.

The 1SMA59xxH series was developed specifically for high-reliability voltage regulation in automotive and industrial power conversion systems, emphasizing tight tolerance, thermal stability, and robust packaging for automated SMT assembly.

FAQ

What is the exact zener voltage range for 1SMA5948H at 25°C?

The 1SMA5948H has a guaranteed zener voltage range of 86.45 V to 95.55 V at I_ZT = 4.1 mA and T_A = 25°C, reflecting its ±5% tolerance specification. This range is validated under thermal equilibrium conditions per the manufacturer's test methodology and applies directly to the 1SMA5948H part number-not extrapolated from adjacent variants in the family.

Is 1SMA5948H suitable for automotive applications?

Yes, the 1SMA5948H is AEC-Q101 qualified, meaning it has passed stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. This certification confirms its suitability for automotive electronic control units, body electronics, and powertrain subsystems where the 1SMA5948H serves as a voltage reference or overvoltage clamp.

What is the maximum DC zener current rating for 1SMA5948H?

The maximum DC zener current (I_ZM) for the 1SMA5948H is 16 mA, determined at thermal equilibrium and specified in the electrical characteristics table. This value defines the upper limit of continuous current the 1SMA5948H can sustain while maintaining regulation within its 1.5 W power envelope and +150°C junction temperature limit.

Does 1SMA5948H have moisture sensitivity level (MSL) restrictions?

No, the 1SMA5948H is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during assembly of the 1SMA5948H into high-volume PCB production.

How does the dynamic impedance of 1SMA5948H affect regulation accuracy?

The 1SMA5948H exhibits Z_ZT = 4.1 Ω at I_ZT = 4.1 mA, which directly determines how much output voltage shifts with load current changes. Lower Z_ZT means tighter regulation-e.g., a 10 mA load step causes only ~41 mV deviation in the 1SMA5948H's regulated voltage, critical for stable feedback in precision DC/DC converters using the 1SMA5948H.

1SMA5948H Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 91 V

Tolerance:: ±5%

Power - Max:: 1.5 W

Impedance (Max) (Zzt):: 200 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 69.2 V

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

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

1SMA5948H FAQ

1.How can I place an order for 1SMA5948H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMA5948H 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 1SMA5948H reliable?

The price and inventory of 1SMA5948H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5948H is usually 5 days.

3.What payment methods are accepted for 1SMA5948H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5948H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMA5948H?

1SMA5948H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMA5948H 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 1SMA5948H?

For technical support, including 1SMA5948H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5948H requirements.

6.How does Aetrix verify that 1SMA5948H is sourced from the original manufacturer or authorized distributors?

All 1SMA5948H 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 1SMA5948H meets industry standards.

7.What is the process for return or replacement of 1SMA5948H?

All 1SMA5948H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5948H, 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 1SMA5948H part is unused and in its original packaging.

Return procedure for 1SMA5948H:

1.Submit a request within 90 days.

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

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