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

Taiwan Semiconductor Corporation 1SMA4752

Name: 1SMA4752
Brand: Taiwan Semiconductor Corporation
SKU: 1SMA4752
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMA4752

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: 1SMA4752.pdf

Description:: DIODE ZENER 33V 1.25W DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:7,316

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Product details

Overview

1SMA4752 from Taiwan Semiconductor is a 1 W surface-mount Zener diode with nominal zener voltage 33 V, test current 7.5 mA, dynamic impedance 45 Ω at IZT, and maximum leakage current 1 µA at 25.1 V reverse bias. It operates from −55 °C to +175 °C and is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the 1SMA4752 datasheet, 1SMA4752 pinout, 1SMA4752 application, or 1SMA4752 equivalent, key selection criteria include its ±5% zener voltage tolerance, DO-214AC (SMA) package thermal performance, low-inductance glass-passivated junction, and verified surge capability up to 135 A peak non-repetitive forward current.

Technical Context

The 1SMA4752 functions as a single-die, unidirectional voltage reference device with sharp reverse-breakdown characteristics. Its zener impedance of 45 Ω at 7.5 mA ensures stable regulation under moderate load variation, while the 1000 Ω impedance at knee current (IZK = 1 mA) supports low-current sensing applications.

Designed for surface-mount assembly on PCBs with 5 mm × 5 mm copper pads, the device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. Its cathode band polarity marking and matte tin-plated leads comply with J-STD-002 solderability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z @ I_ZT	33 V ±5% - precise reference voltage at 7.5 mA test current
I_ZT	7.5 mA - standardized operating point for regulation and impedance measurement
Z_ZT @ I_ZT	45 Ω - low dynamic impedance enables tight output voltage control
P_D	1 W at 25 °C ambient - defines continuous power handling on standard PCB layout
T_J max	+175 °C - high junction temperature rating supports operation in thermally constrained environments
I_R @ V_R	≤1 µA at 25.1 V - minimal leakage preserves accuracy in high-impedance bias networks
I_FSM	30 A - peak forward surge current withstand for transient suppression during startup or fault

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration with cathode indicated by a visible band. Weight: 0.060 g. Molding compound rated UL 94V-0.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-biased regulation mode; carries full forward surge current
Cathode	Zener breakdown terminal	Connected to higher-potential node; defines regulated output voltage referenced to anode

Key Features

Feature	Design Value
Glass passivated chip junction	Enables stable long-term zener voltage drift <0.1%/1000 h and robust humidity resistance
Low inductance construction	Minimizes voltage overshoot during fast transients, critical for ESD and surge clamping
Moisture sensitivity level 1	Eliminates need for dry-pack or baking prior to reflow, reducing manufacturing overhead
RoHS and halogen-free compliance	Meets IEC 61249-2-21 and global environmental directives without performance trade-offs

Applications

Switch-Mode Power Supply Feedback	Industrial Sensor Signal Conditioning
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Voltage reference element setting error amplifier threshold in secondary-side regulation loop. Use Value: 33 V nominal zener voltage matches common TL431-based feedback thresholds; ±5% tolerance ensures ±1% output regulation accuracy.	Use Scenario: Providing stable bias voltage for analog front-end amplifiers in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Precision shunt reference supplying excitation to bridge sensors and op-amp bias networks. Use Value: Low 1 µA leakage at 25.1 V prevents loading of high-impedance sensor outputs; 45 Ω impedance maintains stability under varying load currents.
Overvoltage Protection Clamp	Microcontroller I/O Line Protection
Use Scenario: Clamping transient surges on 24 V DC input rails in PLC backplanes and motor drives. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when rail exceeds safe threshold. Use Value: 135 A non-repetitive surge current rating handles IEC 61000-4-5 Level 4 surges; DO-214AC thermal mass sustains clamping without thermal runaway.	Use Scenario: ESD and overvoltage protection for UART, SPI, or GPIO lines interfacing with external connectors. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting pin voltage to safe levels during fast transients. Use Value: Cathode-band polarity ensures correct orientation in series-shunt configurations; glass passivation prevents parametric shift after repeated ESD events.

Switch-Mode Power Supply Feedback

Industrial Sensor Signal Conditioning

Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback network.

IC Role / Device Role / Timing Role: Voltage reference element setting error amplifier threshold in secondary-side regulation loop.

Use Value: 33 V nominal zener voltage matches common TL431-based feedback thresholds; ±5% tolerance ensures ±1% output regulation accuracy.

Use Scenario: Providing stable bias voltage for analog front-end amplifiers in 4–20 mA transmitter modules.

IC Role / Device Role / Timing Role: Precision shunt reference supplying excitation to bridge sensors and op-amp bias networks.

Use Value: Low 1 µA leakage at 25.1 V prevents loading of high-impedance sensor outputs; 45 Ω impedance maintains stability under varying load currents.

Overvoltage Protection Clamp

Microcontroller I/O Line Protection

Use Scenario: Clamping transient surges on 24 V DC input rails in PLC backplanes and motor drives.

IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when rail exceeds safe threshold.

Use Value: 135 A non-repetitive surge current rating handles IEC 61000-4-5 Level 4 surges; DO-214AC thermal mass sustains clamping without thermal runaway.

Use Scenario: ESD and overvoltage protection for UART, SPI, or GPIO lines interfacing with external connectors.

IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting pin voltage to safe levels during fast transients.

Use Value: Cathode-band polarity ensures correct orientation in series-shunt configurations; glass passivation prevents parametric shift after repeated ESD events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5252BS	Same 33 V nominal V_Z, but SOT-23 package (0.25 W rating); 30 Ω Z_ZT at 10 mA	Limited to low-power signal-level clamping; unsuitable for >150 mW continuous dissipation	Select when board space is constrained and thermal budget permits lower power handling
1N4752A	Through-hole DO-41 package; identical electrical specs but larger footprint and higher thermal resistance	Requires manual or wave-solder process; not compatible with automated SMT lines	Select only for legacy through-hole designs or prototyping where reflow compatibility is not required

Compared with MMBZ5252BS and 1N4752A, the 1SMA4752 uniquely balances 1 W power handling, DO-214AC SMT compatibility, and industrial-grade reliability-making it optimal for production-grade power regulation and protection where thermal margin and assembly efficiency are critical.

Availability

1SMA4752 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and microcontroller I/O line protection requiring stable component supply and RoHS-compliant sourcing.

Supply support for 1SMA4752 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, rectifiers, and protection components with ISO/TS 16949 and IATF 16949 certification.

The 1SMA47xx series was developed for high-reliability surface-mount voltage regulation and transient suppression in automotive, industrial, and telecom infrastructure applications-emphasizing thermal robustness, tight tolerances, and JEDEC-compliant surge performance.

FAQ

What is the zener voltage tolerance for 1SMA4752?

The 1SMA4752 has a nominal zener voltage of 33 V with a standard tolerance of ±5%, meaning the actual measured V_Z at 7.5 mA test current falls between 31.35 V and 34.65 V. This tolerance is guaranteed per JEDEC registration and applies across the full operating temperature range of −55 °C to +175 °C. The 1SMA4752 datasheet specifies this tolerance in Note 1 of the Electrical Specifications table.

Does 1SMA4752 support automated pick-and-place assembly?

Yes, the 1SMA4752 is explicitly designed for automated placement, as confirmed in the FEATURES section of the official datasheet. Its DO-214AC (SMA) package, matte tin-plated leads, and Level 1 moisture sensitivity rating eliminate pre-baking requirements and ensure reliable solder joint formation during standard reflow profiles. The 1SMA4752 is supplied in 7,500-unit tape-and-reel packaging compatible with industry-standard feeders.

What is the maximum non-repetitive surge current rating for 1SMA4752?

The 1SMA4752 has a peak forward surge current (I_FSM) rating of 30 A for an 8.3 ms single half-sine wave, as specified in the Absolute Maximum Ratings table. Additionally, its non-repetitive peak power dissipation (P_ZSM) is 60 W under defined pulse conditions (t_p = 100 µs square pulse). These ratings are validated per JEDEC standards and apply when the device is mounted on a PCB with a 5 mm × 5 mm copper pad.

How does the zener impedance of 1SMA4752 affect regulation performance?

The 1SMA4752 exhibits a zener impedance (Z_ZT) of 45 Ω at its 7.5 mA test current, which directly determines output voltage variation under changing load conditions. A lower Z_ZT yields tighter regulation-e.g., a 1 mA load change causes only ~45 mV shift in output. At knee current (I_ZK = 1 mA), Z_ZK rises to 1000 Ω, indicating reduced regulation effectiveness at very low currents. This behavior is documented in Figure 3 of the 1SMA4752 datasheet.

Is 1SMA4752 compliant with halogen-free and RoHS requirements?

Yes, the 1SMA4752 is both RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the FEATURES section of the official datasheet. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. These compliance statements are verified through TSC's internal material declarations and third-party lab testing reports.

1SMA4752 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):: 33 V

Tolerance:: ±5%

Power - Max:: 1.25 W

Impedance (Max) (Zzt):: 45 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 25.1 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)

1SMA4752 FAQ

1.How can I place an order for 1SMA4752 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMA4752 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 1SMA4752 reliable?

The price and inventory of 1SMA4752 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4752 is usually 5 days.

3.What payment methods are accepted for 1SMA4752?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4752 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMA4752?

1SMA4752 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMA4752 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 1SMA4752?

For technical support, including 1SMA4752 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4752 requirements.

6.How does Aetrix verify that 1SMA4752 is sourced from the original manufacturer or authorized distributors?

All 1SMA4752 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 1SMA4752 meets industry standards.

7.What is the process for return or replacement of 1SMA4752?

All 1SMA4752 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4752, 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 1SMA4752 part is unused and in its original packaging.

Return procedure for 1SMA4752:

1.Submit a request within 90 days.

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

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