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Taiwan Semiconductor Corporation 1SMA4755
- Part No.:
- 1SMA4755
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4755.pdf
- Description:
- DIODE ZENER 43V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,716
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Product details
Overview
1SMA4755 from Taiwan Semiconductor is a 1 W, 43 V ±5% surface-mount Zener diode in DO-214AC (SMA) package, with 6.0 mA test current, 70 Ω dynamic impedance at IZT, 0.25 µA leakage at 32.7 V, and 110 A non-repetitive surge capability-used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the 1SMA4755 datasheet, 1SMA4755 pinout, 1SMA4755 application, or 1SMA4755 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 rating, and DO-214AC thermal derating behavior on PCB layouts.
Technical Context
The 1SMA4755 operates as a single-die, glass-passivated Zener diode optimized for stable reverse-bias voltage clamping under steady-state and transient conditions. Its 43 V nominal breakdown voltage is specified at 6.0 mA (IZT), with 70 Ω dynamic impedance (ZZT) measured using 10% RMS AC superimposed on DC bias at 1 kHz.
It supports operation across –55°C to +175°C junction temperature, exhibits ≤0.25 µA leakage at 32.7 V (80% of VZ), and delivers 110 A peak surge current (IFSM) for 8.3 ms half-sine pulses-enabling robust protection in industrial power supplies and automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 43 V ±5% at 6.0 mA - defines regulated output voltage under standard test load |
| ZZT @ IZT | 70 Ω - low dynamic impedance ensures minimal voltage deviation during load transients |
| IR @ VR | ≤0.25 µA at 32.7 V - guarantees negligible standby current in high-impedance sensing circuits |
| PD (TA = 25°C) | 1 W - maximum continuous dissipation on PCB with 5 mm × 5 mm Cu pad |
| IFSM | 110 A (8.3 ms half-sine) - enables reliable surge suppression without failure |
| TJ Range | –55°C to +175°C - supports operation in under-hood automotive and industrial environments |
| Package | DO-214AC (SMA) - surface-mount footprint compatible with automated assembly and JEDEC-standard reflow |
Pinout & Package
DO-214AC (SMA) package with axial polarity marking: cathode indicated by a band on the body. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation; carries forward current up to 30 A surge |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; maintains stable 43 V reference when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability and low parameter drift under thermal cycling and humidity exposure |
| Low inductance construction | Minimizes voltage overshoot during fast transients, critical for ESD and surge clamp response |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow, reducing manufacturing overhead and handling risk |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation required for safety-certified power supply designs |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for industrial and consumer end equipment |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing 48 V intermediate bus in telecom power modules where ±5% output tolerance is acceptable. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp and regulate output voltage. Use Value: Delivers 43 V reference with 70 Ω dynamic impedance, minimizing output ripple under 100 mA load steps. | Use Scenario: Safeguarding microcontroller I/O pins against 60 V transients induced by relay coil flyback. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between I/O line and ground. Use Value: Clamps spikes within 10 ns with 110 A surge rating and <0.25 µA leakage at 32.7 V. |
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
Use Scenario: Providing local 43 V bias for CAN transceiver termination resistors in 12 V/24 V vehicle networks. IC Role / Device Role / Timing Role: Voltage reference and rail clamp in 12 V–48 V distributed power architecture. Use Value: Operates reliably from –40°C to +125°C ambient with full 175°C junction rating and UL 94V-0 housing. | Use Scenario: Biasing precision op-amp input stages in 4–20 mA loop-powered sensors exposed to EMI. IC Role / Device Role / Timing Role: Low-leakage Zener providing stable reference for analog front-end calibration. Use Value: ≤0.25 µA leakage at 32.7 V prevents signal offset errors in high-impedance feedback paths. |
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 1N4755A | Same 43 V ±5%, 1 W rating, but DO-41 through-hole package; higher ZZT (80 Ω) | Requires PCB redesign for through-hole mounting; less suitable for high-density SMT layouts | Select only if legacy through-hole compatibility or higher surge margin (125 A IFSM) is prioritized over board space |
| Vishay 1N5255B | 43 V ±5%, 0.5 W rating, DO-35 package; lower PD and higher ZZT (100 Ω) | Limited to low-power signal-level regulation; not rated for 110 A surge or 175°C TJ | Use only in low-current (<20 mA), non-automotive applications where thermal budget is constrained |
Compared with 1SMA4755, the 1N4755A offers higher surge current but requires through-hole assembly, while the 1N5255B sacrifices power handling and thermal robustness for smaller size-making 1SMA4755 optimal for SMT-based industrial and automotive regulation where 1 W dissipation and 175°C operation are essential.
Availability
1SMA4755 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and automotive body control modules requiring stable component supply, RoHS-compliant sourcing, and moisture-insensitive packaging.
Supply support for 1SMA4755 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 protection components for industrial and automotive markets.
The 1SMA47xx series was designed specifically for surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding applications-emphasizing reliability, JEDEC-compliant packaging, and tight parametric consistency across voltage grades.
FAQ
What is the nominal Zener voltage and tolerance of the 1SMA4755?
The 1SMA4755 has a nominal Zener voltage of 43 V with a standard tolerance of ±5%, measured at 6.0 mA test current (IZT) with lead temperature maintained at 30°C ±1°C. This tolerance ensures predictable clamping behavior in voltage reference and protection circuits without requiring post-manufacturing sorting.
What is the maximum power dissipation of the 1SMA4755 at 60°C ambient temperature?
The 1SMA4755 delivers 1.25 W maximum power dissipation at TA = 60°C when mounted on a PCB with thermal resistance RTHJA < 76.8 K/W. This derated value reflects its thermal design for use in enclosed industrial enclosures where ambient temperatures exceed 25°C but remain below 60°C.
Does the 1SMA4755 have a defined surge current rating, and what waveform does it apply to?
Yes, the 1SMA4755 has a non-repetitive peak forward surge current (IFSM) rating of 110 A for an 8.3 ms single half-sine wave superimposed on rated load. This rating is validated per JEDEC standards and applies directly to relay coil flyback, inductive switching, and lightning-induced transient suppression scenarios.
What is the leakage current specification for the 1SMA4755, and at what reverse voltage is it guaranteed?
The 1SMA4755 guarantees ≤0.25 µA leakage current (IR) at a reverse voltage (VR) of 32.7 V-equivalent to 80% of its nominal 43 V Zener voltage. This low leakage supports high-impedance bias networks and precision analog circuits where standby current must be minimized.
Is the 1SMA4755 compliant with RoHS and halogen-free standards?
Yes, the 1SMA4755 is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads satisfy J-STD-002 solderability and JESD 201 Class 2 whisker resistance-ensuring environmental compliance and long-term reliability in commercial and industrial assemblies.
1SMA4755 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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 32.7 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)
1SMA4755 FAQ
1.How can I place an order for 1SMA4755 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4755 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 1SMA4755 reliable?
The price and inventory of 1SMA4755 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4755 is usually 5 days.
3.What payment methods are accepted for 1SMA4755?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4755 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4755?
1SMA4755 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4755 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 1SMA4755?
For technical support, including 1SMA4755 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4755 requirements.
6.How does Aetrix verify that 1SMA4755 is sourced from the original manufacturer or authorized distributors?
All 1SMA4755 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 1SMA4755 meets industry standards.
7.What is the process for return or replacement of 1SMA4755?
All 1SMA4755 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4755, 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 1SMA4755 part is unused and in its original packaging.
Return procedure for 1SMA4755:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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