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

Taiwan Semiconductor Corporation 1SMB5949H

Name: 1SMB5949H
Brand: Taiwan Semiconductor Corporation
SKU: 1SMB5949H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMB5949H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AA, SMB

Datasheet:: 1SMB5949H.pdf

Description:: DIODE ZENER 100V 3W DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:7,290

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Product details

Overview

1SMB5949H from Taiwan Semiconductor is a surface-mount silicon Zener diode rated for 3 W power dissipation, with a nominal Zener voltage of 100 V (min 95.0 V, max 105.0 V) at 3.7 mA test current, 3100 Ω dynamic impedance at IZT, and AEC-Q101 qualification for automotive-grade reliability in voltage reference and overvoltage protection circuits.

For engineers reviewing the 1SMB5949H datasheet, 1SMB5949H pinout, 1SMB5949H application, or 1SMB5949H equivalent, this device serves as a precision 100 V Zener reference in power supply feedback loops, ESD clamp networks, and industrial sensor signal conditioning where stable breakdown voltage and low leakage (<1 μA at 76 V) are critical.

Technical Context

The 1SMB5949H operates as a single-die, unidirectional Zener diode in DO-214AA (SMB) package, featuring glass-passivated junction for stable V_Z and low inductance. Its 100 V nominal Zener voltage exhibits +0.085 %/°C temperature coefficient above 6 V, and it maintains ≤1 μA reverse leakage at 76 V (80 % of V_Z).

Thermal performance includes 25 °C/W junction-to-lead resistance and 226 °C/W junction-to-ambient resistance (on FR-4 PCB), enabling reliable operation up to 150 °C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	95.0–105.0 V @ 3.7 mA - defines precise clamping/reference level in feedback or protection paths
Power Dissipation P_TOT	3 W @ T_L = 75 °C - supports sustained regulation under moderate thermal load on copper pad
Zener Impedance Z_ZT	3100 Ω @ I_ZT - indicates voltage stability under small-signal AC variations
Leakage Current I_R	<1 μA @ 76 V - ensures minimal error in high-impedance reference nodes
Junction Temperature	−55 to +150 °C - enables deployment in under-hood automotive and industrial environments
Package	DO-214AA (SMB) - surface-mount footprint compatible with automated assembly and IPC-7351B standard

Pinout & Package

DO-214AA (SMB) package with cathode indicated by molded band; two-terminal device with anode and cathode leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during forward bias; reference ground node in Zener configuration	Connected to lower-potential side of circuit; establishes reference polarity for clamping
Cathode	Current exit point during Zener breakdown; high-side connection in regulation	Connected to voltage source or signal line being regulated/clamped; marked with band

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per stress test requirements including HTOL, TC, and HAST
Glass passivated junction	Ensures long-term V_Z stability and reduced parameter drift under thermal cycling
Low inductance construction	Supports fast transient suppression in ESD and surge protection applications
Moisture sensitivity Level 1	Zero bake requirement before reflow; compatible with standard SMT assembly lines
RoHS & halogen-free	Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing

Applications

Automotive Power Supply Feedback	Industrial Sensor Reference
Use Scenario: Regulating output voltage in 12 V/24 V DC-DC converters for engine control units (ECUs). IC Role / Device Role / Timing Role: Zener reference element in TL431-based shunt regulator feedback network. Use Value: Provides stable 100 V reference tolerance (±5 %) across −40 to +125 °C ambient, minimizing output drift.	Use Scenario: Generating precision bias voltage for strain gauge bridge amplifiers in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Voltage reference source establishing common-mode level for instrumentation amplifier input stage. Use Value: Delivers <1 μA leakage at 76 V, preventing loading errors in high-impedance sensor interfaces.
ESD Protection Clamp	Overvoltage Crowbar Circuit
Use Scenario: Secondary-level transient suppression on CAN transceiver V_CC rail against ISO 10605 pulses. IC Role / Device Role / Timing Role: Low-inductance Zener clamp absorbing fast-rising ESD energy before IC damage. Use Value: Glass-passivated junction withstands repeated 15 kV air discharge events without parametric shift.	Use Scenario: Triggering SCR-based crowbar in 48 V telecom power supplies during overvoltage faults. IC Role / Device Role / Timing Role: Precision 100 V threshold detector initiating fault shutdown sequence. Use Value: Tight 95–105 V V_Z window ensures deterministic trip point with ±0.5 V margin over system max rating.

Automotive Power Supply Feedback

Industrial Sensor Reference

Use Scenario: Regulating output voltage in 12 V/24 V DC-DC converters for engine control units (ECUs).

IC Role / Device Role / Timing Role: Zener reference element in TL431-based shunt regulator feedback network.

Use Value: Provides stable 100 V reference tolerance (±5 %) across −40 to +125 °C ambient, minimizing output drift.

Use Scenario: Generating precision bias voltage for strain gauge bridge amplifiers in factory-floor pressure sensors.

IC Role / Device Role / Timing Role: Voltage reference source establishing common-mode level for instrumentation amplifier input stage.

Use Value: Delivers <1 μA leakage at 76 V, preventing loading errors in high-impedance sensor interfaces.

ESD Protection Clamp

Overvoltage Crowbar Circuit

Use Scenario: Secondary-level transient suppression on CAN transceiver V_CC rail against ISO 10605 pulses.

IC Role / Device Role / Timing Role: Low-inductance Zener clamp absorbing fast-rising ESD energy before IC damage.

Use Value: Glass-passivated junction withstands repeated 15 kV air discharge events without parametric shift.

Use Scenario: Triggering SCR-based crowbar in 48 V telecom power supplies during overvoltage faults.

IC Role / Device Role / Timing Role: Precision 100 V threshold detector initiating fault shutdown sequence.

Use Value: Tight 95–105 V V_Z window ensures deterministic trip point with ±0.5 V margin over system max rating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMF100A (ON Semiconductor)	Lower P_PPM (200 W vs. 3 W DC), higher I_R (5 μA @ 80 V), same DO-214AA package	Better suited for transient-only suppression; not recommended for continuous regulation	Select when primary need is surge clamping, not stable DC reference
BZX84-C100 (Nexperia)	SOT-23 package (0.35 W P_TOT), higher Z_ZT (5000 Ω), ±6 % V_Z tolerance	Only viable for low-power, non-automotive reference use due to derated power and wider tolerance	Choose only for space-constrained, cost-sensitive consumer designs with relaxed accuracy needs

Compared with SMF100A and BZX84-C100, the 1SMB5949H delivers superior DC regulation stability, AEC-Q101 qualification, and thermal robustness-making it the preferred choice for automotive and industrial systems requiring sustained 100 V reference integrity under thermal stress.

Availability

1SMB5949H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor calibration, and telecom overvoltage protection requiring stable component supply and full traceability.

Supply support for 1SMB5949H 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, specializing in high-reliability power devices and protection components.

The 1SMB59xxH series was designed specifically for AEC-Q101-compliant automotive voltage regulation and clamping, emphasizing thermal stability, low leakage, and automated assembly compatibility in SMB packages.

FAQ

What is the exact Zener voltage tolerance for 1SMB5949H?

The 1SMB5949H has a nominal Zener voltage of 100 V with a guaranteed range of 95.0 V to 105.0 V at 3.7 mA test current, corresponding to ±5 % tolerance per the datasheet's Type Number designation and Note 1 on tolerance.

Is 1SMB5949H suitable for continuous DC voltage regulation?

Yes, the 1SMB5949H is rated for 3 W continuous DC power dissipation at lead temperature of 75 °C, making it suitable for steady-state regulation in power supply feedback networks and reference circuits where thermal management is implemented.

Does 1SMB5949H meet automotive qualification standards?

Yes, the 1SMB5949H is explicitly AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress test (HAST), confirming suitability for automotive electronic modules.

What is the maximum reverse leakage current for 1SMB5949H?

The 1SMB5949H specifies maximum reverse leakage current of 1 μA at 76 V (80 % of nominal V_Z), measured at 25 °C ambient, ensuring minimal loading in high-impedance reference applications.

Can 1SMB5949H be used in place of 1SMB5948H or 1SMB5950H?

No direct substitution is recommended: 1SMB5948H is rated 91–95.55 V, and 1SMB5950H is 104.5–115.5 V-both fall outside the 95–105 V range of 1SMB5949H. Circuit performance depends critically on exact V_Z, so replacement requires validation of regulation setpoint and thermal margin.

1SMB5949H Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 100 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 250 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 76 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-214AA (SMB)

1SMB5949H FAQ

1.How can I place an order for 1SMB5949H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMB5949H 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 1SMB5949H reliable?

The price and inventory of 1SMB5949H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5949H is usually 5 days.

3.What payment methods are accepted for 1SMB5949H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5949H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMB5949H?

1SMB5949H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMB5949H 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 1SMB5949H?

For technical support, including 1SMB5949H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5949H requirements.

6.How does Aetrix verify that 1SMB5949H is sourced from the original manufacturer or authorized distributors?

All 1SMB5949H 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 1SMB5949H meets industry standards.

7.What is the process for return or replacement of 1SMB5949H?

All 1SMB5949H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5949H, 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 1SMB5949H part is unused and in its original packaging.

Return procedure for 1SMB5949H:

1.Submit a request within 90 days.

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

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