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Taiwan Semiconductor Corporation 1SMA4754
- Part No.:
- 1SMA4754
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4754.pdf
- Description:
- DIODE ZENER 39V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,746
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Product details
Overview
1SMA4754 from Taiwan Semiconductor is a 1 W surface-mount Zener diode with a nominal zener voltage of 39 V ±5%, test current of 6.5 mA, dynamic impedance of 60 Ω at IZT, and maximum leakage current of 1 µA at 29.7 V. It operates across -55°C to +175°C junction temperature and is used for precision voltage regulation and overvoltage protection in power supply feedback loops and transient suppression circuits.
For engineers reviewing the 1SMA4754 datasheet, 1SMA4754 pinout, 1SMA4754 application, or 1SMA4754 equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, 39 V regulation tolerance, thermal stability up to 175°C, low leakage performance, and surge current rating of 115 A (non-repetitive, 8.3 ms half-sine).
Technical Context
The 1SMA4754 functions as a single-die, glass-passivated Zener diode optimized for stable reverse-bias voltage reference and clamping. Its electrical behavior is defined by a 39 V nominal breakdown voltage at 6.5 mA, 60 Ω dynamic impedance at rated test current, and <1 µA leakage at 75% of VZ (29.7 V), ensuring tight regulation under light-load conditions.
Designed for surface-mount assembly on standard PCBs, it features matte tin-plated leads compliant with J-STD-002 solderability, meets JESD201 Class 2 whisker resistance, and carries moisture sensitivity level 1 per J-STD-020 - enabling reflow without baking or special handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% - defines precise clamping threshold in voltage-reference and protection circuits |
| Test Current (IZT) | 6.5 mA - operating point where VZ and ZZT are guaranteed; sets minimum bias for stable regulation |
| Zener Impedance (ZZT) | 60 Ω at IZT - determines regulation accuracy under varying load current; lower values improve line/load regulation |
| Power Dissipation (PD) | 1 W at TA = 25°C - maximum continuous power in standard mounting; derates linearly above 25°C ambient |
| Junction Temperature (TJ) | -55°C to +175°C - enables use in automotive under-hood, industrial motor drives, and high-temp power supplies |
| Leakage Current (IR) | ≤1 µA at VR = 29.7 V - ensures minimal standby power loss and signal integrity in high-impedance sensing nodes |
| Surge Current (IFSM) | 30 A (8.3 ms half-sine) - withstands common AC-line transients and inductive switching spikes without failure |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by band on body. Weight: 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation circuits; forms reference ground for feedback networks |
| Cathode | Zener breakdown terminal / voltage clamp output | Connected to regulated rail or protected node; sinks current when input exceeds 39 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures long-term reliability and stable VZ drift under thermal cycling and humidity exposure |
| Low inductance construction | Minimizes voltage overshoot during fast transients, improving ESD and surge suppression effectiveness |
| Moisture sensitivity level 1 | Eliminates pre-bake requirement before reflow, reducing manufacturing cost and process complexity |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for industrial and consumer end equipment |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 39 V threshold to error amplifier input. Use Value: Enables ±1% output regulation accuracy across line/load/temperature with minimal external components. | Use Scenario: Clamping DC bus voltage in motor drive inverters to prevent IGBT overvoltage failure. IC Role / Device Role / Timing Role: Fast-acting shunt protector triggered at 39 V, diverting surge energy to ground. Use Value: Withstands 30 A non-repetitive surge (8.3 ms), protecting downstream power stages without crowbar circuitry. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
Use Scenario: Biasing and protecting analog front-end inputs of 24 V industrial sensors against ESD and cable discharge. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) clamping diode limiting input to 39 V while preserving signal fidelity. Use Value: Maintains high input impedance (>10 MΩ) and prevents op-amp saturation during transients. | Use Scenario: Regulating auxiliary 12 V rail in BCM modules powered from vehicle battery (9–16 V range). IC Role / Device Role / Timing Role: Zener-based reference for LDO enable threshold or microcontroller brown-out detection. Use Value: Operates reliably from -40°C to +125°C ambient, meeting AEC-Q200 stress requirements for under-hood use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4754A | Same 39 V ±5% VZ, but DO-41 through-hole package; higher thermal resistance (RθJA ≈ 125 K/W vs. SMA's ~77 K/W) | Requires PCB through-hole layout; unsuitable for high-density SMT designs or automated placement | Select only if legacy through-hole assembly or manual prototyping is required |
| BZX84-C39 | 39 V ±5% VZ, SOT-23 package; lower PD (300 mW), higher ZZT (90 Ω), and narrower TJ range (-65°C to +150°C) | Limited to low-power signal-level clamping; cannot replace 1SMA4754 in 1 W power regulation roles | Use only in space-constrained, low-current applications where 1 W dissipation is unnecessary |
Compared with 1N4754A and BZX84-C39, the 1SMA4754 delivers superior thermal performance in SMT layouts, supports full 1 W continuous operation at elevated temperatures, and maintains tighter dynamic impedance - making it the preferred choice for industrial power regulation and robust overvoltage protection.
Availability
1SMA4754 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive body control modules requiring stable component supply, RoHS-compliant sourcing, and extended temperature operation.
Supply support for 1SMA4754 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 voltage regulation and transient suppression in compact, thermally demanding environments - emphasizing low leakage, stable VZ, and JEDEC-compliant surge robustness.
FAQ
What is the nominal zener voltage and tolerance of the 1SMA4754?
The 1SMA4754 has a nominal zener voltage of 39 V with a standard tolerance of ±5%, measured at 6.5 mA test current and 30°C lead temperature. This tolerance ensures predictable clamping behavior in feedback and protection circuits across production lots and temperature ranges.
Can the 1SMA4754 be used in automotive under-hood applications?
Yes, the 1SMA4754 supports junction temperatures from -55°C to +175°C and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - making it suitable for under-hood automotive modules such as body control units and engine management subsystems when properly mounted on thermally enhanced PCBs.
What is the maximum non-repetitive surge current rating for the 1SMA4754?
The 1SMA4754 is rated for a non-repetitive peak forward surge current (IFSM) of 30 A for an 8.3 ms single half-sine wave, per JEDEC standards. This rating applies to transient events like inductive kickback or lightning-induced surges, provided the device is not subjected to repetitive pulses exceeding thermal limits.
How does the 1SMA4754 compare to the 1N4754A in terms of thermal performance?
The 1SMA4754 in DO-214AC (SMA) package offers significantly better thermal performance than the through-hole 1N4754A (DO-41), with typical RθJA ≈ 77 K/W versus ~125 K/W. This allows the 1SMA4754 to sustain full 1 W dissipation at higher ambient temperatures and supports denser PCB layouts without thermal derating penalties.
Is the 1SMA4754 halogen-free and RoHS compliant?
Yes, the 1SMA4754 uses halogen-free molding compound per IEC 61249-2-21 and is fully RoHS compliant. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the entire construction satisfies environmental regulations for industrial, consumer, and automotive end equipment.
1SMA4754 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 29.7 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)
1SMA4754 FAQ
1.How can I place an order for 1SMA4754 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4754 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 1SMA4754 reliable?
The price and inventory of 1SMA4754 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4754 is usually 5 days.
3.What payment methods are accepted for 1SMA4754?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4754 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4754?
1SMA4754 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4754 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 1SMA4754?
For technical support, including 1SMA4754 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4754 requirements.
6.How does Aetrix verify that 1SMA4754 is sourced from the original manufacturer or authorized distributors?
All 1SMA4754 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 1SMA4754 meets industry standards.
7.What is the process for return or replacement of 1SMA4754?
All 1SMA4754 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4754, 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 1SMA4754 part is unused and in its original packaging.
Return procedure for 1SMA4754:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA4754 Tags
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