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Taiwan Semiconductor Corporation 1SMA4761H
- Part No.:
- 1SMA4761H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4761H.pdf
- Description:
- DIODE ZENER 75V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,928
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Product details
Overview
1SMA4761H from Taiwan Semiconductor is a 1 W, 75 V ±5% surface-mount Zener diode in DO-214AC (SMA) package, featuring glass-passivated junction, AEC-Q101 qualification, low inductance, and typical leakage current <0.25 µA at 56.0 V. It delivers stable voltage regulation in automotive power rail protection circuits.
For engineers reviewing the 1SMA4761H datasheet, 1SMA4761H pinout, 1SMA4761H application, or 1SMA4761H equivalent, key selection criteria include nominal Zener voltage (75 V), test current (3.3 mA), dynamic impedance (175 Ω), surge current rating (60 A), and junction temperature range (–55°C to +175°C).
Technical Context
The 1SMA4761H operates as a single-die, unidirectional voltage reference device with sharp reverse breakdown at 75 V under 3.3 mA test current. Its 175 Ω dynamic impedance at IZT and 2000 Ω at knee current (IZK = 1 mA) supports stable regulation across moderate load variations.
Designed for high-reliability environments, it meets AEC-Q101 stress testing requirements and features moisture sensitivity level 1 (J-STD-020), matte tin-plated leads compliant with J-STD-002, and UL 94V-0 molding compound - enabling robust automated placement in automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage VZ | 75 V ±5% - precise reference for 56–75 V system clamping |
| Test current IZT | 3.3 mA - defines operating point for specified VZ and ZZT |
| Zener impedance ZZT | 175 Ω @ 3.3 mA - determines regulation stiffness under dynamic load shifts |
| Max leakage IR | 0.25 µA @ 56.0 V - ensures minimal standby power loss in high-impedance bias networks |
| Power dissipation PD | 1 W @ TA = 25°C - supports continuous regulation in compact SMT layouts with 5 mm × 5 mm Cu pad |
| Junction temperature TJ | –55°C to +175°C - enables operation in under-hood automotive environments |
| Surge current IFSM | 60 A @ 8.3 ms half-sine - withstands transient overvoltage events per JEDEC standards |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single anode-cathode configuration with cathode band marking. Weight: 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during regulation; carries forward current up to 30 A surge |
| Cathode | Reverse breakdown terminal | Connected to higher-potential node; defines 75 V reference point when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress |
| Low inductance construction | Minimizes voltage overshoot during fast transients, critical for ESD and load dump suppression |
| Moisture sensitivity level 1 | Enables direct use from reel without baking, reducing manufacturing overhead |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for automotive supply chains |
Applications
| Automotive Power Rail Protection | Industrial Sensor Reference Supply |
|---|---|
Use Scenario: Clamping 12 V/24 V battery lines against load dump spikes up to 60 V in engine control units. IC Role / Device Role / Timing Role: Voltage reference and transient suppressor placed between rail and ground. Use Value: 75 V VZ provides 15 V margin above worst-case 60 V load dump, while 1 W PD sustains clamping without thermal runaway. | Use Scenario: Providing stable 75 V bias for high-voltage op-amp input stages in precision pressure transducers. IC Role / Device Role / Timing Role: Precision shunt reference establishing fixed node voltage for analog front-end scaling. Use Value: ±5% tolerance and 175 Ω ZZT ensure <0.5% output error across 1–10 mA load current variation. |
| LED Driver Overvoltage Clamp | Programmable Power Supply Feedback |
Use Scenario: Protecting constant-current LED drivers from bus overvoltage during hot-swap events. IC Role / Device Role / Timing Role: Reverse-biased shunt clamp across output capacitor terminals. Use Value: 60 A IFSM handles 8.3 ms surges without degradation; low leakage (<0.25 µA) avoids false triggering in standby mode. | Use Scenario: Setting upper limit on adjustable DC-DC converter output via optocoupler feedback network. IC Role / Device Role / Timing Role: Zener element in voltage divider that triggers isolation feedback at 75 V. Use Value: Tight 75 V ±5% tolerance ensures accurate trip point; 175 Ω impedance minimizes divider loading error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ75A | TVS diode, 75 V standoff, 1500 W peak pulse power, bidirectional | Designed for transient suppression only, not precision regulation | Select for high-energy surge protection where regulation accuracy is secondary |
| BZX84-C75 | SOT-23 package, 75 V ±5%, 300 mW PD, 5 mA IZT, 200 Ω ZZT | Lower power rating limits use to signal-level biasing, not power rail clamping | Select for space-constrained low-power circuits where 1 W dissipation is unnecessary |
Compared with SMCJ75A and BZX84-C75, the 1SMA4761H uniquely balances 1 W continuous power handling, automotive qualification, and ±5% voltage accuracy in a surface-mount SMA package - making it optimal for regulated clamping in automotive and industrial power systems.
Availability
1SMA4761H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor reference supplies, LED driver overvoltage clamping, and programmable power supply feedback requiring stable component supply and AEC-Q101 compliance.
Supply support for 1SMA4761H 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 automotive, industrial, and consumer markets.
The 1SMA47xxH series was developed specifically for AEC-Q101-compliant surface-mount voltage regulation and transient suppression in harsh-environment automotive electronics, emphasizing reliability, tight tolerances, and high surge capability.
FAQ
What is the nominal Zener voltage and tolerance of the 1SMA4761H?
The 1SMA4761H has a nominal Zener voltage of 75 V with a standard tolerance of ±5%, measured at a test current of 3.3 mA and lead temperature maintained at 30°C ±1°C. This tolerance ensures predictable clamping behavior in automotive and industrial voltage regulation circuits where 71.25–78.75 V operation is acceptable.
Is the 1SMA4761H qualified for automotive applications?
Yes, the 1SMA4761H is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. This qualification confirms its suitability for under-hood automotive systems such as engine control modules and body electronics where reliability under thermal and mechanical stress is critical.
What is the maximum non-repetitive peak surge current rating for the 1SMA4761H?
The 1SMA4761H supports a non-repetitive peak forward surge current (IFSM) of 60 A for an 8.3 ms single half-sine wave, as defined by JEDEC standards. This rating allows the 1SMA4761H to absorb common automotive load dump transients without failure when properly heatsinked on a 5 mm × 5 mm copper pad.
Does the 1SMA4761H have RoHS and halogen-free compliance?
Yes, the 1SMA4761H is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and its matte tin-plated leads satisfy solderability requirements per J-STD-002 - ensuring compatibility with lead-free reflow processes and environmental regulations for global automotive supply chains.
What is the Zener impedance of the 1SMA4761H and why does it matter?
The 1SMA4761H exhibits a Zener impedance (ZZT) of 175 Ω at its 3.3 mA test current, and 2000 Ω at the 1 mA knee current (IZK). This impedance directly affects regulation accuracy: lower ZZT yields smaller output voltage variation under changing load current, making the 1SMA4761H suitable for applications demanding stable reference voltage despite moderate current fluctuations.
1SMA4761H 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):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 175 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 56 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)
1SMA4761H FAQ
1.How can I place an order for 1SMA4761H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4761H 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 1SMA4761H reliable?
The price and inventory of 1SMA4761H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4761H is usually 5 days.
3.What payment methods are accepted for 1SMA4761H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4761H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4761H?
1SMA4761H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4761H 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 1SMA4761H?
For technical support, including 1SMA4761H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4761H requirements.
6.How does Aetrix verify that 1SMA4761H is sourced from the original manufacturer or authorized distributors?
All 1SMA4761H 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 1SMA4761H meets industry standards.
7.What is the process for return or replacement of 1SMA4761H?
All 1SMA4761H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4761H, 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 1SMA4761H part is unused and in its original packaging.
Return procedure for 1SMA4761H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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