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Taiwan Semiconductor Corporation 1SMA4751H
- Part No.:
- 1SMA4751H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4751H.pdf
- Description:
- DIODE ZENER 30V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,081
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Product details
Overview
1SMA4751H from Taiwan Semiconductor is a surface-mount 30 V, 1 W Zener diode in DO-214AC (SMA) package, rated for 8.5 mA test current, 40 Ω dynamic impedance at IZT, 0.25 µA leakage at 22.8 V, and junction temperature up to +175°C. It serves as a precision voltage reference and overvoltage clamp in power supply regulation and ESD protection circuits.
For engineers reviewing the 1SMA4751H datasheet, 1SMA4751H pinout, 1SMA4751H application, or 1SMA4751H equivalent, key selection criteria include its ±5% zener tolerance, AEC-Q101 qualification, low-inductance SMA package, glass-passivated junction, and verified surge capability of 150 A (8.3 ms half-sine).
Technical Context
The 1SMA4751H operates as a single-die, unidirectional Zener diode with sharp reverse breakdown at nominal 30 V. Its electrical behavior is defined by tightly controlled test conditions: VZ measured at 90 s with lead temperature held at 30°C ±1°C, and Zz derived using 1 kHz AC superimposed on DC IZT.
It features a low-leakage design (IR ≤ 0.25 µA at VR = 22.8 V), thermal stability across –55°C to +175°C operating range, and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 30 V ±5% - defines stable clamping/reference point under 8.5 mA DC bias |
| Test Current (IZT) | 8.5 mA - standardized bias condition for VZ and Zz measurement |
| Zener Impedance (ZZT) | 40 Ω at IZT - indicates regulation stiffness; lower value enables tighter voltage control under load variation |
| Maximum Power Dissipation (PD) | 1 W at TA = 25°C - sets continuous thermal limit on PCB with RTHJA < 76.8 K/W |
| Leakage Current (IR) | ≤0.25 µA at VR = 22.8 V - ensures minimal parasitic current in high-impedance bias networks |
| Surge Current (IFSM) | 150 A (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
| Junction Temperature Range | –55°C to +175°C - enables deployment in under-hood automotive and industrial environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded epoxy case with matte tin-plated leads, cathode indicated by band. Weight: 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in clamp configuration | Connected to ground or lower-potential node during reverse-bias operation |
| Cathode | Zener breakdown terminal / high-side connection in clamp configuration | Connected to protected rail or reference node; polarity marked by visible band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated chip junction | Enhances long-term stability and reduces parameter drift under humidity and thermal stress |
| Low inductance construction | Minimizes voltage overshoot during fast transients-critical for ESD and surge suppression |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking; compatible with J-STD-020 reflow profiles |
| RoHS and halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients in BCM microcontroller power domains. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage protector for MCU VDD pins. Use Value: Withstands 150 A surge (8.3 ms) and maintains ≤0.25 µA leakage below 22.8 V, preserving low-power sleep states. |
Use Scenario: Protecting 24 V digital input channels from field-induced surges in programmable logic controllers. IC Role / Device Role / Timing Role: Standalone voltage clamp placed between input terminal and optocoupler anode. Use Value: 40 Ω Zz ensures stable 30 V clamping threshold across temperature, reducing false triggering in noisy factory environments. |
| DC-DC Converter Feedback Reference | USB-C Port Overvoltage Clamp |
Use Scenario: Providing precise 30 V reference for error amplifier feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Zener diode used in conjunction with TL431 or op-amp to set output voltage. Use Value: ±5% VZ tolerance and low tempco (<±6 mV/°C above 12 V) enable accurate regulation across –40°C to +125°C ambient. |
Use Scenario: Secondary-level overvoltage protection on USB-C VBUS lines after primary TVS stage. IC Role / Device Role / Timing Role: Low-leakage Zener clamping excess voltage before it reaches USB PD controller ICs. Use Value: 0.25 µA IR at 22.8 V prevents standby current drain while maintaining fast response to >30 V faults. |
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 1N4751A | Same 30 V ±5%, 1 W rating but DO-41 through-hole package; higher Zz (50 Ω) and higher IR (1 µA @ 22.8 V) | Requires PCB redesign for through-hole mounting; less suitable for automated SMT lines | Select when legacy through-hole compatibility or higher surge margin (1 A IFSM) is prioritized over footprint density |
| Vishay 1N5251B | 30 V ±5%, 0.5 W rating in DO-35 package; Zz = 35 Ω but limited to 5.2 mA IZT and 100°C TJ max | Not rated for automotive or high-temp industrial use; unsuitable for >125°C ambient | Choose only for low-power, cost-sensitive consumer applications where thermal derating is acceptable |
Compared with 1N4751A and 1N5251B, the 1SMA4751H delivers superior SMT manufacturability, tighter thermal performance (175°C TJ), and lower leakage-making it the preferred choice for automotive and industrial designs requiring AEC-Q101 compliance and high-reliability surface-mount integration.
Availability
1SMA4751H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, DC-DC converter feedback networks, and USB-C port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for 1SMA4751H 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 certification capabilities.
The 1SMA47xxH series was designed specifically for high-reliability surface-mount voltage regulation and transient suppression in automotive and industrial systems, emphasizing robustness, tight parametric control, and automated assembly compatibility.
FAQ
What is the Zener voltage tolerance for 1SMA4751H?
The 1SMA4751H has a nominal Zener voltage of 30 V with a standard tolerance of ±5%, meaning the actual measured VZ at 8.5 mA falls between 28.5 V and 31.5 V under specified test conditions (lead temperature held at 30°C ±1°C for 90 seconds). This tolerance is confirmed in the Electrical Specifications table on page 2 of the Taiwan Semiconductor datasheet revision A2102.
Is 1SMA4751H suitable for automotive applications?
Yes, the 1SMA4751H is AEC-Q101 qualified, meeting stress test requirements for automotive discrete semiconductors including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge. Its –55°C to +175°C junction temperature range and DO-214AC package with JESD201 Class 2 whisker resistance make it appropriate for under-hood and body control module use.
What is the maximum non-repetitive surge current rating for 1SMA4751H?
The 1SMA4751H is rated for a non-repetitive peak forward surge current (IFSM) of 150 A at 8.3 ms single half-sine wave, as specified in the Absolute Maximum Ratings table. This rating applies with rated load superimposed and is validated per JEDEC standards-enabling reliable transient suppression in power rail protection circuits.
Does 1SMA4751H have a halogen-free and RoHS-compliant construction?
Yes, the 1SMA4751H uses halogen-free molding compound per IEC 61249-2-21 and is fully RoHS compliant. The device also meets UL 94V-0 flammability rating and employs matte tin-plated leads solderable per J-STD-002, supporting environmentally regulated and safety-critical end equipment.
How does the Zener impedance of 1SMA4751H affect voltage regulation performance?
The 1SMA4751H exhibits a Zener impedance (ZZT) of 40 Ω at 8.5 mA test current, which directly determines how much the output voltage varies with changes in load current. A lower ZZT improves regulation accuracy-e.g., a 1 mA change in bias current causes only ~40 mV shift in clamped voltage-making 1SMA4751H effective in precision reference and low-noise clamp applications.
1SMA4751H 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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 22.8 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)
1SMA4751H FAQ
1.How can I place an order for 1SMA4751H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4751H 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 1SMA4751H reliable?
The price and inventory of 1SMA4751H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4751H is usually 5 days.
3.What payment methods are accepted for 1SMA4751H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4751H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4751H?
1SMA4751H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4751H 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 1SMA4751H?
For technical support, including 1SMA4751H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4751H requirements.
6.How does Aetrix verify that 1SMA4751H is sourced from the original manufacturer or authorized distributors?
All 1SMA4751H 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 1SMA4751H meets industry standards.
7.What is the process for return or replacement of 1SMA4751H?
All 1SMA4751H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4751H, 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 1SMA4751H part is unused and in its original packaging.
Return procedure for 1SMA4751H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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