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

Taiwan Semiconductor Corporation 1SMA4753

Name: 1SMA4753
Brand: Taiwan Semiconductor Corporation
SKU: 1SMA4753
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMA4753

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: 1SMA4753.pdf

Description:: DIODE ZENER 36V 1.25W DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:2,339

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Product details

Overview

1SMA4753 from Taiwan Semiconductor is a surface-mount 1 W Zener diode with nominal zener voltage 36 V ±5%, test current 7.0 mA, dynamic impedance 50 Ω at IZT, and maximum leakage current 1 µA at 27.4 V. It operates from −55°C to +175°C and is used for precision voltage regulation and overvoltage protection in power supply feedback loops.

For engineers reviewing the 1SMA4753 datasheet, 1SMA4753 pinout, 1SMA4753 application, or 1SMA4753 equivalent, key selection criteria include zener voltage tolerance, surge current capability (125 A), thermal derating behavior, and DO-214AC package compatibility with automated SMT assembly.

Technical Context

The 1SMA4753 functions as a single-die, glass-passivated Zener diode optimized for stable reverse-biased breakdown regulation. Its 36 V nominal zener voltage exhibits a positive temperature coefficient above ~5 V, and its 50 Ω dynamic impedance at 7.0 mA ensures predictable regulation under moderate load variation.

Designed for surface-mount use in DO-214AC (SMA) package, it supports non-repetitive peak surge power up to 60 W (100 µs pulse) and maintains ≤1 µA leakage at 80% of VZ (27.4 V), enabling low-power standby protection in industrial DC rails.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z @ I_ZT	36 V ±5% - precise reference voltage for feedback networks requiring tight tolerance
I_ZT	7.0 mA - standardized test current ensuring repeatable V_Z measurement and circuit bias point
Z_ZT @ I_ZT	50 Ω - low dynamic impedance minimizes output voltage deviation under load transients
I_R @ V_R = 27.4 V	≤1 µA - ultra-low leakage preserves battery life and prevents false triggering in high-impedance circuits
P_D (T_A = 25°C)	1 W - continuous dissipation rating defining maximum steady-state power handling on standard PCB copper
T_J_MAX	+175°C - high junction temperature enables operation in under-hood or enclosed industrial environments
I_FSM	30 A - peak forward surge current withstand supports inrush-limited rectifier protection

Pinout & Package

Package: DO-214AC (SMA), surface-mount, cathode indicated by band. Weight: 0.060 g. Molding compound meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-bias regulation; accepts forward surge up to 30 A
Cathode	Reverse breakdown terminal	Connected to regulated rail; defines 36 V reference when biased above V_Z with ≥7.0 mA

Key Features

Feature	Design Value
Glass passivated chip junction	Ensures long-term stability of V_Z and low parameter drift under thermal cycling and humidity stress
Low inductance construction	Minimizes voltage overshoot during fast transient suppression, critical for ESD and surge clamping
Moisture sensitivity level 1 (J-STD-020)	Eliminates bake requirement before reflow, reducing manufacturing cost and process complexity
RoHS and halogen-free compliance	Meets IEC 61249-2-21 and global environmental directives for industrial and consumer end equipment

Applications

Switch-Mode Power Supply Feedback	Overvoltage Clamp for Microcontroller I/O
Use Scenario: Regulating 12 V output in isolated flyback converter using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing stable 36 V threshold to TL431 shunt regulator input. Use Value: Tight ±5% V_Z tolerance and 50 Ω Z_ZT ensure <±1% output voltage accuracy across line/load/temperature.	Use Scenario: Protecting 3.3 V GPIO pins against accidental 24 V field wiring faults. IC Role / Device Role / Timing Role: Standby clamp conducting only during overvoltage events; normally presents <1 µA leakage. Use Value: 125 A non-repetitive surge current rating absorbs 24 V × 5 A fault energy without failure.
Industrial Sensor Signal Conditioning	Programmable Logic Controller Input Protection
Use Scenario: Biasing and protecting 4–20 mA current-loop transmitter output stage. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting output voltage to 36 V during open-circuit or lightning-induced surges. Use Value: 175°C max junction temperature allows uninterrupted operation in uncooled control cabinet environments.	Use Scenario: Safeguarding 24 V digital input channels against induced transients on factory floor wiring. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point. Use Value: Low 50 Ω dynamic impedance ensures clamped voltage stays below 40 V even under 10 A surge conditions.

Switch-Mode Power Supply Feedback

Overvoltage Clamp for Microcontroller I/O

Use Scenario: Regulating 12 V output in isolated flyback converter using optocoupler-coupled feedback loop.

IC Role / Device Role / Timing Role: Zener reference providing stable 36 V threshold to TL431 shunt regulator input.

Use Value: Tight ±5% V_Z tolerance and 50 Ω Z_ZT ensure <±1% output voltage accuracy across line/load/temperature.

Use Scenario: Protecting 3.3 V GPIO pins against accidental 24 V field wiring faults.

IC Role / Device Role / Timing Role: Standby clamp conducting only during overvoltage events; normally presents <1 µA leakage.

Use Value: 125 A non-repetitive surge current rating absorbs 24 V × 5 A fault energy without failure.

Industrial Sensor Signal Conditioning

Programmable Logic Controller Input Protection

Use Scenario: Biasing and protecting 4–20 mA current-loop transmitter output stage.

IC Role / Device Role / Timing Role: Reverse-biased Zener limiting output voltage to 36 V during open-circuit or lightning-induced surges.

Use Value: 175°C max junction temperature allows uninterrupted operation in uncooled control cabinet environments.

Use Scenario: Safeguarding 24 V digital input channels against induced transients on factory floor wiring.

IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point.

Use Value: Low 50 Ω dynamic impedance ensures clamped voltage stays below 40 V even under 10 A surge conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor 1N4753A	Same 36 V ±5% V_Z, but higher Z_ZT (70 Ω vs. 50 Ω); 1.3 W power rating	Slightly looser regulation under dynamic load; better suited for higher ambient temperature PCBs	Select when thermal margin >1.3 W is available and tighter impedance is not required
Vishay 1N4753A-E3	Identical V_Z and Z_ZT, but DO-41 through-hole package; no moisture sensitivity level rating	Requires manual or wave soldering; unsuitable for high-volume SMT lines	Choose only for legacy through-hole designs or prototyping where reflow compatibility is unnecessary

Compared with 1N4753A and 1N4753A-E3, the 1SMA4753 offers superior SMT manufacturability (MSL-1), lower dynamic impedance for tighter regulation, and verified DO-214AC footprint compatibility-making it optimal for new industrial power and protection designs requiring automated assembly.

Availability

1SMA4753 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and programmable logic controller input protection requiring stable component supply and full RoHS/halogen-free compliance.

Supply support for 1SMA4753 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 industrial, automotive, and consumer markets.

The 1SMA47xx series was developed specifically for high-reliability surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding applications such as power adapters and factory automation controllers.

FAQ

What is the zener voltage tolerance for 1SMA4753?

The 1SMA4753 has a nominal zener voltage of 36 V with a standard tolerance of ±5%, meaning the actual measured V_Z falls between 34.2 V and 37.8 V at 7.0 mA test current and 30°C lead temperature. This tolerance is guaranteed per JEDEC registration and applies across the full operating temperature range of −55°C to +175°C.

Can 1SMA4753 be used in place of 1N4753A?

The 1SMA4753 is not a direct drop-in replacement for 1N4753A due to differing packages (DO-214AC vs. DO-41) and thermal characteristics. While both share 36 V ±5% V_Z, the 1SMA4753 offers lower dynamic impedance (50 Ω vs. 70 Ω) and is rated for surface-mount reflow. Use 1SMA4753 only when the PCB layout supports SMA footprint and thermal design accounts for its 1 W rating.

What is the maximum non-repetitive surge current for 1SMA4753?

The 1SMA4753 supports a non-repetitive peak forward surge current (I_FSM) of 30 A for an 8.3 ms half-sine wave, and a non-repetitive reverse surge current of 125 A (derived from P_ZSM = 60 W at V_Z ≈ 36 V). These ratings assume TA = 25°C prior to surge and are validated per JEDEC test conditions in the official Taiwan Semiconductor datasheet.

Is 1SMA4753 suitable for automotive applications?

The 1SMA4753 is not qualified to AEC-Q101 and is not recommended for automotive safety-critical systems. However, it is widely used in non-safety automotive subsystems such as infotainment power rails and body control module auxiliary supplies where industrial-grade reliability suffices and temperature requirements align with its −55°C to +175°C operating range.

Does 1SMA4753 require baking before reflow soldering?

No, the 1SMA4753 has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without pre-baking. This eliminates an extra manufacturing step and reduces risk of popcorn cracking during assembly.

1SMA4753 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):: 36 V

Tolerance:: ±5%

Power - Max:: 1.25 W

Impedance (Max) (Zzt):: 50 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 27.4 V

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

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

1SMA4753 FAQ

1.How can I place an order for 1SMA4753 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMA4753 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 1SMA4753 reliable?

The price and inventory of 1SMA4753 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4753 is usually 5 days.

3.What payment methods are accepted for 1SMA4753?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4753 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMA4753?

1SMA4753 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMA4753 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 1SMA4753?

For technical support, including 1SMA4753 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4753 requirements.

6.How does Aetrix verify that 1SMA4753 is sourced from the original manufacturer or authorized distributors?

All 1SMA4753 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 1SMA4753 meets industry standards.

7.What is the process for return or replacement of 1SMA4753?

All 1SMA4753 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4753, 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 1SMA4753 part is unused and in its original packaging.

Return procedure for 1SMA4753:

1.Submit a request within 90 days.

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

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