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Taiwan Semiconductor Corporation 1SMA4762
- Part No.:
- 1SMA4762
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4762.pdf
- Description:
- DIODE ZENER 82V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,852
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Product details
Overview
1SMA4762 from Taiwan Semiconductor is a 1 W, 82 V ±5% surface-mount Zener diode in DO-214AC (SMA) package, featuring 3.0 mA test current, 200 Ω dynamic impedance at IZT, 0.25 µA leakage at 62.2 V, and 55 A non-repetitive peak surge current. It serves as a precision voltage reference and overvoltage clamp in DC power rail regulation.
For engineers reviewing the 1SMA4762 datasheet, 1SMA4762 pinout, 1SMA4762 application, or 1SMA4762 equivalent, key selection criteria include nominal Zener voltage tolerance, dynamic impedance at rated test current, junction temperature range (–55°C to +175°C), surge current capability, and DO-214AC mechanical compatibility with automated SMT assembly.
Technical Context
The 1SMA4762 operates as a single-die, glass-passivated Zener diode optimized for stable reverse-bias breakdown at 82 V under 3.0 mA test current. Its 200 Ω dynamic impedance (ZZT) and low leakage (≤0.25 µA at 62.2 V) support tight regulation in low-power reference circuits.
Designed for surface-mount use in DO-214AC, it delivers 1 W continuous power dissipation at 25°C ambient, derating linearly to 1.25 W at 60°C with RTHJA < 76.8 K/W, and withstands 60 W non-repetitive peak surge power per JEDEC-standard 100 µs pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 82 V ±5% - defines precise clamping threshold for 12 V–48 V system rails |
| Test Current (IZT) | 3.0 mA - standard bias point for guaranteed VZ and ZZT measurement |
| Zener Impedance (ZZT) | 200 Ω at IZT - determines regulation sensitivity to load current variation |
| Leakage Current (IR) | ≤0.25 µA at 62.2 V - ensures minimal standby power loss in high-impedance bias networks |
| Peak Surge Current (IFSM) | 55 A - supports transient suppression of 8.3 ms half-sine surges without failure |
| Power Dissipation (PD) | 1 W at TA = 25°C - sets thermal design margin for PCB copper pad area and airflow |
| Junction Temperature Range | –55°C to +175°C - enables operation in automotive under-hood and industrial motor control environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, cathode-indicated by band, matte tin-plated leads, 0.060 g mass, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during Zener operation |
| Cathode | Reverse-bias breakdown terminal / regulated output node | Provides stable 82 V reference when biased above VZ with current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures long-term stability of VZ and low parameter drift under thermal cycling |
| Low inductance construction | Minimizes voltage overshoot during fast transients, critical for ESD and surge protection |
| Moisture sensitivity level 1 (J-STD-020) | Eliminates bake requirement before reflow, reducing manufacturing cost and process risk |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for industrial and consumer products |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback auxiliary supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode providing 82 V reference to optocoupler input, enabling primary-side regulation. Use Value: Tight ±5% VZ tolerance and 200 Ω ZZT ensure <±1.5% output voltage accuracy across line/load/temperature. | Use Scenario: Clamping 12 V battery rail against load-dump transients in engine control units. IC Role / Device Role / Timing Role: Standby overvoltage protector absorbing 55 A surge pulses without degradation. Use Value: 60 W non-repetitive surge rating and –55°C to +175°C TJ range support ASIL-B functional safety requirements. |
| Telecom Line Card Protection | Medical Instrument Reference |
Use Scenario: Protecting Ethernet PHY interface ICs from induced surges on PoE-powered line cards. IC Role / Device Role / Timing Role: Secondary-stage clamp after TVS, limiting residual voltage to safe levels for 3.3 V logic. Use Value: Low 0.25 µA leakage at 62.2 V prevents signal integrity degradation in high-impedance analog monitoring paths. | Use Scenario: Generating stable bias voltage for precision ADC front-end amplifiers in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-noise voltage reference source with minimal thermal coefficient drift. Use Value: Glass passivation and DO-214AC thermal resistance enable <50 ppm/°C effective TC over 0–70°C operating range. |
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 1N4742A | 12 V nominal, 21 mA IZT, 9 Ω ZZT, DO-41 through-hole package | Lower voltage, higher current, through-hole mounting - unsuitable for SMT-only designs | Select only if board layout allows axial leaded components and 12 V regulation is required |
| Vishay 1SMA4762HE3_A/H | Identical 82 V specification, same DO-214AC package, AEC-Q200 qualified | Automotive-grade qualification adds vibration/thermal cycling reliability for chassis electronics | Prefer for automotive applications requiring AEC-Q200 compliance; otherwise functionally interchangeable |
Compared with 1SMA4762, the 1N4742A requires PCB redesign for through-hole placement and targets different voltage rails, while the Vishay 1SMA4762HE3_A/H offers identical electrical specs plus automotive qualification-making it a drop-in alternative where AEC-Q200 is mandated.
Availability
1SMA4762 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU voltage clamp, and telecom line card protection requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for 1SMA4762 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 for industrial and automotive markets.
The 1SMA47xx series was designed specifically for high-reliability, surface-mount Zener regulation and transient suppression in space-constrained, thermally demanding applications such as motor drives and power converters.
FAQ
What is the nominal Zener voltage and tolerance of the 1SMA4762?
The 1SMA4762 has a nominal Zener voltage of 82 V with a standard tolerance of ±5%, measured at 3.0 mA test current and 30°C lead temperature. This tolerance ensures predictable clamping behavior in voltage reference and overvoltage protection circuits across production lots and temperature ranges.
Does the 1SMA4762 support automated SMT placement?
Yes, the 1SMA4762 uses the DO-214AC (SMA) package with matte tin-plated leads compliant with J-STD-002 solderability standards and moisture sensitivity level 1 per J-STD-020-enabling direct placement into reflow processes without baking or special handling.
What is the maximum non-repetitive peak surge current rating for the 1SMA4762?
The 1SMA4762 is rated for 55 A non-repetitive peak surge current (IFSM) under an 8.3 ms single half-sine wave condition. This rating reflects its ability to absorb transient energy without parametric shift or catastrophic failure in surge-prone applications like automotive load dump.
How does the 1SMA4762's Zener impedance affect regulation accuracy?
The 1SMA4762 exhibits 200 Ω dynamic impedance (ZZT) at 3.0 mA test current. This value directly impacts output voltage deviation under varying load currents: a 10 mA change in Zener current causes ~2 V shift in clamped voltage, necessitating appropriate series resistance selection for target regulation stability.
Is the 1SMA4762 RoHS and halogen-free compliant?
Yes, the 1SMA4762 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, and terminals pass JESD201 Class 2 whisker testing-ensuring environmental compliance and long-term reliability in consumer and industrial end equipment.
1SMA4762 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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 62.2 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)
1SMA4762 FAQ
1.How can I place an order for 1SMA4762 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4762 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 1SMA4762 reliable?
The price and inventory of 1SMA4762 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4762 is usually 5 days.
3.What payment methods are accepted for 1SMA4762?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4762 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4762?
1SMA4762 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4762 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 1SMA4762?
For technical support, including 1SMA4762 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4762 requirements.
6.How does Aetrix verify that 1SMA4762 is sourced from the original manufacturer or authorized distributors?
All 1SMA4762 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 1SMA4762 meets industry standards.
7.What is the process for return or replacement of 1SMA4762?
All 1SMA4762 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4762, 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 1SMA4762 part is unused and in its original packaging.
Return procedure for 1SMA4762:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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