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Taiwan Semiconductor Corporation 1SMA4757H
- Part No.:
- 1SMA4757H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4757H.pdf
- Description:
- DIODE ZENER 51V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,754
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Product details
Overview
1SMA4757H from Taiwan Semiconductor is a surface-mount Zener diode designed for voltage regulation and overvoltage protection in power supply and signal conditioning circuits. It delivers a nominal Zener voltage of 51 V ±5%, with a test current of 5.0 mA, dynamic impedance of 95 Ω at IZT, maximum power dissipation of 1 W, and junction temperature rating up to +175°C. It is widely used in automotive body control modules for ECU rail clamping.
For engineers reviewing the 1SMA4757H datasheet, 1SMA4757H pinout, 1SMA4757H application, or 1SMA4757H equivalent, key selection criteria include Zener voltage tolerance, surge current capability (90 A), low leakage current (<1 µA at 38.8 V), thermal robustness (TJ = −55°C to +175°C), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The 1SMA4757H operates as a single-die, unidirectional Zener diode in DO-214AC (SMA) package, with glass-passivated junction ensuring stable breakdown characteristics and low inductance. Its electrical behavior is defined by tight Zener voltage tolerance (±5%), low dynamic impedance (95 Ω at 5 mA), and controlled leakage (<0.25 µA at VR = 38.8 V).
It supports non-repetitive peak surge power up to 60 W (100 µs pulse), withstands forward surge current of 30 A (8.3 ms half-sine), and maintains stable regulation across −55°C to +175°C junction temperature range - critical for under-hood automotive environments where thermal cycling and transient immunity are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% - ensures precise clamping at 38.8 V minimum and 53.6 V maximum under specified test conditions |
| Test Current (IZT) | 5.0 mA - defines operating point for guaranteed VZ and ZZT specification |
| Zener Impedance (ZZT) | 95 Ω at IZT - determines regulation stiffness and output voltage variation under load changes |
| Maximum Power Dissipation (PD) | 1 W at TA = 25°C - sets continuous thermal limit on PCB with standard copper pad (5 mm × 5 mm) |
| Leakage Current (IR) | <0.25 µA at VR = 38.8 V - enables low-power standby operation without significant quiescent loss |
| Surge Current (ISM) | 90 A (non-repetitive, 1/2 sine, 8.3 ms) - provides robust transient suppression against ISO 7637-2 Pulse 1/2/5a events |
| Junction Temperature Range | −55°C to +175°C - qualified for under-hood automotive applications per AEC-Q101 |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode indicated by a band on the body. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD 201 Class 2 whisker resistance. Weight: ~0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node during reverse-bias regulation; forms return path for clamping current |
| Cathode | Zener breakdown terminal | Connected to protected rail or regulated node; conducts reverse current when VIN exceeds 51 V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock testing |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure |
| Low inductance construction | Minimizes voltage overshoot during fast transients, improving clamping fidelity in high-dV/dt environments |
| Moisture sensitivity level 1 | Enables direct placement without baking; compatible with standard SMT reflow profiles per J-STD-020 |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamps 12 V battery rail against load dump transients (ISO 7637-2 Pulse 5a) in BCM power inputs. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, diverting surge energy to ground before downstream LDOs or MCUs. Use Value: Withstands 90 A surge and maintains regulation at 51 V, preventing damage to 3.3 V/5 V logic rails downstream. | Use Scenario: Protects 24 V DC digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standalone Zener clamp placed before optocoupler input, limiting voltage to safe levels during ESD or inductive kick events. Use Value: Low leakage (<0.25 µA) avoids false triggering; ±5% VZ tolerance ensures consistent trip threshold across production lots. |
| DC-DC Converter Feedback Divider | Telecom Line Interface Protection |
Use Scenario: Stabilizes feedback node voltage in isolated flyback converters using TL431-based regulation. IC Role / Device Role / Timing Role: Precision Zener providing reference voltage for error amplifier biasing and loop compensation stability. Use Value: 95 Ω ZZT minimizes feedback node impedance variation, improving output voltage accuracy and transient response. | Use Scenario: Guards RS-485 transceiver VCC pins against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary shunt clamp on power rail, coordinated with TVS diodes on data lines for layered protection. Use Value: 175°C max junction temperature allows reliable operation in sealed telecom enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 5.1 V nominal, 1 W, DO-41 through-hole package; no AEC-Q101 qualification | Designed for general-purpose prototyping and non-automotive PCBs; lacks moisture sensitivity level 1 and automotive qualification | Select only for cost-sensitive, non-automotive, non-SMT applications where leaded assembly is acceptable |
| SMBJ51A | 51 V standoff, 600 W peak power, bidirectional TVS; higher capacitance (~200 pF), not a precision Zener | Optimized for ESD/surge suppression rather than voltage regulation; unsuitable for feedback or biasing roles | Choose when primary need is transient immunity-not stable DC clamping-especially in high-speed data line protection |
Compared with 1N4733A and SMBJ51A, the 1SMA4757H uniquely combines automotive qualification, surface-mount compatibility, and precision Zener regulation-making it irreplaceable in AEC-Q101-compliant power rail clamping where both accuracy and ruggedness are required.
Availability
1SMA4757H is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1SMA4757H 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, analog ICs, and automotive-qualified components.
The 1SMA47xxH series was developed specifically for AEC-Q101-compliant Zener regulation in harsh-environment automotive and industrial systems, emphasizing thermal resilience, surge robustness, and SMT manufacturability.
FAQ
What is the Zener voltage tolerance for the 1SMA4757H?
The 1SMA4757H has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 48.45 V and 53.55 V when measured at 5.0 mA test current and 30°C lead temperature. This tolerance is guaranteed per JEDEC registration and applies across the full operating temperature range.
Is the 1SMA4757H suitable for automotive applications?
Yes, the 1SMA4757H is AEC-Q101 qualified and rated for junction temperatures from −55°C to +175°C. Its glass-passivated junction, low inductance, and moisture sensitivity level 1 make it suitable for under-hood automotive applications such as body control modules and engine control units where reliability under thermal cycling and transient stress is critical.
What is the maximum non-repetitive surge current rating for the 1SMA4757H?
The 1SMA4757H supports a non-repetitive peak forward surge current (IFSM) of 30 A for an 8.3 ms single half-sine wave, and a reverse surge current of 90 A under the same waveform. These ratings are validated per JEDEC standards and enable robust protection against ISO 7637-2 load dump and pulse 1/2a events in automotive power systems.
Does the 1SMA4757H have RoHS and halogen-free compliance?
Yes, the 1SMA4757H is RoHS compliant per EU Directive 2011/65/EU and halogen-free according to IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated for lead-free solder compatibility - supporting environmentally regulated industrial and automotive manufacturing.
What package type does the 1SMA4757H use, and what are its mounting considerations?
The 1SMA4757H uses the DO-214AC (SMA) surface-mount package. Recommended PCB pad layout follows TSC's suggested dimensions, with thermal relief optimized for 5 mm × 5 mm copper area. Its moisture sensitivity level 1 allows direct placement without pre-baking, and it is compatible with standard lead-free reflow profiles per J-STD-020.
1SMA4757H 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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 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)
1SMA4757H FAQ
1.How can I place an order for 1SMA4757H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4757H 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 1SMA4757H reliable?
The price and inventory of 1SMA4757H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4757H is usually 5 days.
3.What payment methods are accepted for 1SMA4757H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4757H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4757H?
1SMA4757H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4757H 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 1SMA4757H?
For technical support, including 1SMA4757H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4757H requirements.
6.How does Aetrix verify that 1SMA4757H is sourced from the original manufacturer or authorized distributors?
All 1SMA4757H 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 1SMA4757H meets industry standards.
7.What is the process for return or replacement of 1SMA4757H?
All 1SMA4757H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4757H, 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 1SMA4757H part is unused and in its original packaging.
Return procedure for 1SMA4757H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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