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

Taiwan Semiconductor Corporation 1SMA4752H

Name: 1SMA4752H
Brand: Taiwan Semiconductor Corporation
SKU: 1SMA4752H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMA4752H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: 1SMA4752H.pdf

Description:: DIODE ZENER 33V 1.25W DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:7,283

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Product details

Overview

1SMA4752H from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 33 V, test current 7.5 mA, dynamic impedance 45 Ω at IZT, maximum power dissipation 1 W, and DO-214AC (SMA) package. It provides precise voltage regulation and transient overvoltage protection in compact power supply and interface circuits.

For engineers reviewing the 1SMA4752H datasheet, 1SMA4752H pinout, 1SMA4752H application, or 1SMA4752H equivalent, key selection criteria include zener voltage tolerance (±5%), low leakage current (≤1 µA at 25.1 V), AEC-Q101 qualification, and surge current capability (135 A non-repetitive).

Technical Context

The 1SMA4752H operates as a single-die, glass-passivated Zener diode optimized for stable reverse-bias regulation under DC and transient conditions. Its 33 V nominal breakdown voltage is specified at 7.5 mA test current, with dynamic impedance of 45 Ω ensuring tight regulation across load variations.

Designed for automotive-grade reliability, it meets AEC-Q101 stress requirements and features moisture sensitivity level 1 per J-STD-020. Junction temperature range spans −55°C to +175°C, supporting operation in harsh thermal environments without derating below 125°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	33 V ±5% - defines regulated output voltage under 7.5 mA bias; enables accurate reference in feedback loops
Test Current (I_ZT)	7.5 mA - standard operating point for V_Z measurement and impedance characterization
Zener Impedance (Z_ZT)	45 Ω at I_ZT - determines regulation stiffness; lower value improves line/load regulation performance
Maximum Power Dissipation (P_D)	1 W at T_A = 25°C - sets continuous thermal limit on PCB with 5 mm × 5 mm Cu pad
Leakage Current (I_R)	≤1 µA at 25.1 V - ensures minimal standby power loss in high-impedance bias networks
Non-Repetitive Peak Surge Current (I_FSM)	135 A - supports transient suppression of ESD or inductive kick events per JEDEC test waveform
Junction Temperature Range (T_J)	−55°C to +175°C - enables deployment in under-hood automotive and industrial control environments

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by band marking. Matte tin-plated leads, solderable per J-STD-002.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference	Connected to lower-potential node in regulation circuit; establishes reference ground for zener operation
Cathode	Zener breakdown terminal / regulation output node	Connected to higher-potential rail; delivers stable 33 V reference when reverse-biased above breakdown threshold

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics use including engine control, body modules, and ADAS power rails
Glass passivated junction	Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure
Low inductance construction	Minimizes voltage overshoot during fast transients, improving ESD/EMI robustness in signal-line protection
Moisture sensitivity level 1	Eliminates need for baking prior to reflow; supports standard SMT assembly without special handling
RoHS and halogen-free compliance	Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained industrial and consumer applications

Applications

Automotive Power Rail Protection	Industrial Sensor Reference Supply
Use Scenario: Clamping 12 V and 24 V battery-supplied microcontroller I/O lines against load dump and jump-start surges. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector in parallel with protected IC input. Use Value: Withstands 135 A non-repetitive surge and maintains ≤1 µA leakage at 25.1 V, preserving signal integrity and minimizing quiescent current draw.	Use Scenario: Providing stable 33 V reference for precision analog front-ends in temperature, pressure, and current sensors. IC Role / Device Role / Timing Role: Voltage reference element in two-resistor divider or op-amp feedback network. Use Value: ±5% V_Z tolerance and 45 Ω dynamic impedance ensure <±0.5% output variation across 5–10 mA load current range.
DC-DC Converter Feedback Divider	USB-C PD Port Overvoltage Clamp
Use Scenario: Setting output voltage in isolated flyback or buck converter using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision zener in secondary-side voltage sensing network. Use Value: Stable 33 V breakdown at 7.5 mA enables accurate scaling of output voltage via resistor ratio, unaffected by ambient temperature shifts up to 125°C.	Use Scenario: Secondary-side overvoltage clamp on USB-C power delivery port outputs (e.g., 20 V PPS rails). IC Role / Device Role / Timing Role: Fast-acting shunt limiter triggered above 33 V threshold. Use Value: Low 45 Ω Z_ZT and 135 A surge rating suppress transient spikes within nanoseconds while maintaining <1 µA standby leakage at 25.1 V.

Automotive Power Rail Protection

Industrial Sensor Reference Supply

Use Scenario: Clamping 12 V and 24 V battery-supplied microcontroller I/O lines against load dump and jump-start surges.

IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector in parallel with protected IC input.

Use Value: Withstands 135 A non-repetitive surge and maintains ≤1 µA leakage at 25.1 V, preserving signal integrity and minimizing quiescent current draw.

Use Scenario: Providing stable 33 V reference for precision analog front-ends in temperature, pressure, and current sensors.

IC Role / Device Role / Timing Role: Voltage reference element in two-resistor divider or op-amp feedback network.

Use Value: ±5% V_Z tolerance and 45 Ω dynamic impedance ensure <±0.5% output variation across 5–10 mA load current range.

DC-DC Converter Feedback Divider

USB-C PD Port Overvoltage Clamp

Use Scenario: Setting output voltage in isolated flyback or buck converter using optocoupler-coupled feedback loop.

IC Role / Device Role / Timing Role: Precision zener in secondary-side voltage sensing network.

Use Value: Stable 33 V breakdown at 7.5 mA enables accurate scaling of output voltage via resistor ratio, unaffected by ambient temperature shifts up to 125°C.

Use Scenario: Secondary-side overvoltage clamp on USB-C power delivery port outputs (e.g., 20 V PPS rails).

IC Role / Device Role / Timing Role: Fast-acting shunt limiter triggered above 33 V threshold.

Use Value: Low 45 Ω Z_ZT and 135 A surge rating suppress transient spikes within nanoseconds while maintaining <1 µA standby leakage at 25.1 V.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C33	0.3 W power rating, SOT-23 package, 33 V ±5%, 5 µA max leakage at 25.1 V	Limited to low-power signal-level clamping; unsuitable for >100 mA surge or 1 W continuous dissipation	Select when board space is critical and thermal budget is ≤300 mW; not drop-in for 1SMA4752H's 1 W rating
1N4752A	Through-hole DO-41 package, same 33 V ±5% and 1 W rating, but no AEC-Q101 qualification or moisture level 1 rating	Not approved for automotive production; requires baking before reflow due to MSL 2 classification	Select for cost-sensitive industrial prototypes where automotive qualification and SMT compatibility are not required

Compared with BZX84-C33 and 1N4752A, the 1SMA4752H uniquely combines 1 W surface-mount power handling, AEC-Q101 qualification, and MSL 1 process readiness-making it the only option among the three qualified for volume automotive SMT production without derating or special handling.

Availability

1SMA4752H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor reference design, and USB-C PD overvoltage protection requiring stable component supply and full traceability.

Supply support for 1SMA4752H 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, Zener diodes, and TVS components with global distribution and AEC-Q101 validation capability.

The 1SMA47xxH series was designed specifically for high-reliability surface-mount voltage regulation and transient suppression in automotive and industrial power systems, emphasizing thermal robustness, surge resilience, and automated assembly compatibility.

FAQ

What is the zener voltage tolerance for 1SMA4752H?

The 1SMA4752H has a nominal zener voltage of 33 V with a standard tolerance of ±5%, meaning the actual measured V_Z falls between 31.35 V and 34.65 V when tested at 7.5 mA 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. The 1SMA4752H datasheet specifies this tolerance in Note 1 of the electrical characteristics table.

Is 1SMA4752H suitable for automotive applications?

Yes, the 1SMA4752H is AEC-Q101 qualified and rated for junction temperatures up to +175°C, making it suitable for under-hood and body-control module applications. It also meets J-STD-020 moisture sensitivity level 1, eliminating pre-reflow baking, and features matte tin-plated leads compliant with J-STD-002 solderability standards. These attributes are explicitly confirmed in the "Features" and "Mechanical Data" sections of the 1SMA4752H datasheet.

What is the maximum non-repetitive surge current rating for 1SMA4752H?

The 1SMA4752H has a maximum non-repetitive peak surge current (I_FSM) of 135 A, defined per JEDEC as a single half-sine wave pulse of 8.3 ms duration superimposed on rated DC load. This rating is validated under the absolute maximum ratings table and correlates with the "Surge current" column in the electrical specifications table for part number 1SMA4752H. It supports protection against load dump and inductive switching transients.

Does 1SMA4752H have a specified zener impedance at low test currents?

Yes, the 1SMA4752H specifies zener impedance Z_ZK = 700 Ω at I_ZK = 0.25 mA, in addition to Z_ZT = 45 Ω at I_ZT = 7.5 mA. This dual-point impedance characterization allows designers to model regulation behavior across wide current ranges-from light-load biasing to full-rated operation-and is documented in the "ELECTRICAL SPECIFICATIONS" table for 1SMA4752H.

What is the thermal resistance characteristic of 1SMA4752H on a standard PCB?

The 1SMA4752H achieves a thermal resistance R_THJA < 76.8 K/W when mounted on a PCB with a 5 mm × 5 mm copper pad, enabling 1 W power dissipation at 25°C ambient and 1.25 W at 60°C ambient. This derating curve is shown in Figure 1 ("Power Temperature Derating Curve") of the 1SMA4752H datasheet and is validated per JEDEC JESD51-2 standards.

1SMA4752H 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

1SMA4752H FAQ

1.How can I place an order for 1SMA4752H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMA4752H 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 1SMA4752H reliable?

The price and inventory of 1SMA4752H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4752H is usually 5 days.

3.What payment methods are accepted for 1SMA4752H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4752H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMA4752H?

1SMA4752H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMA4752H 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 1SMA4752H?

For technical support, including 1SMA4752H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4752H requirements.

6.How does Aetrix verify that 1SMA4752H is sourced from the original manufacturer or authorized distributors?

All 1SMA4752H 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 1SMA4752H meets industry standards.

7.What is the process for return or replacement of 1SMA4752H?

All 1SMA4752H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4752H, 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 1SMA4752H part is unused and in its original packaging.

Return procedure for 1SMA4752H:

1.Submit a request within 90 days.

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

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