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Taiwan Semiconductor Corporation 1SMA5927
- Part No.:
- 1SMA5927
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5927.pdf
- Description:
- DIODE ZENER 12V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:10,894
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Product details
Overview
1SMA5927 from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with nominal zener voltage 12V (min 11.40V, max 12.60V), tested at 31.2mA, dynamic impedance 6.5Ω, and maximum leakage current 0.5µA at 9.1V. It operates within -55°C to +150°C junction temperature range and is used for voltage regulation in DC/DC converters and SMPS feedback loops.
For engineers reviewing the 1SMA5927 datasheet, 1SMA5927 pinout, 1SMA5927 application, or 1SMA5927 equivalent, key selection criteria include its DO-214AC (SMA) package, ±5% voltage tolerance, low-inductance glass-passivated junction, Class 3B HBM ESD rating, and 1.5W steady-state power dissipation at TL = 75°C.
Technical Context
The 1SMA5927 functions as a precision voltage reference and overvoltage clamp in regulated power supplies. Its zener breakdown mechanism provides stable reverse-bias regulation with 6.5Ω dynamic impedance at 31.2mA test current and <0.5µA leakage above 9.1V.
Designed for surface-mount automated assembly, it features matte tin-plated leads compliant with J-STD-002 solderability, JEDEC JESD201 Class 2 whisker resistance, and UL 94V-0 molding compound. Polarity is marked by cathode band on the DO-214AC body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.40–12.60 V at IZT = 31.2 mA; ensures tight ±5% regulation for feedback sensing |
| Power Dissipation (PD) | 1.5 W at TL = 75°C; supports thermal design on 5 mm × 5 mm Cu pad |
| Dynamic Impedance (ZZT) | 6.5 Ω at IZT = 31.2 mA; minimizes output voltage variation under load transients |
| Leakage Current (IR) | <0.5 µA at VR = 9.1 V; enables low-power standby operation without regulation drift |
| Junction Temperature (TJ) | -55°C to +150°C; suitable for industrial and automotive under-hood environments |
| ESD Rating | Class 3B per JEDEC JESD22-A114 (8 kV HBM); protects against handling-induced damage |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Weight: 0.060 g. Molding compound meets UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or common return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to supply rail being monitored; clamps excess voltage to 12V nominal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enhances long-term stability and reliability of zener voltage under thermal cycling |
| Low inductance construction | Reduces high-frequency ringing during transient clamping in switching regulators |
| Matte tin-plated leads | Ensures robust solder wetting and intermetallic formation per J-STD-002 |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or bake-out prior to reflow assembly |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for end-product certification |
Applications
| SMPS Feedback Regulation | USB-C Adapter Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing output voltage in flyback converter secondary-side feedback loop. IC Role / Device Role: Shunt voltage reference connected across optocoupler input to set precise output threshold. Use Value: 12V ±5% regulation with 6.5Ω impedance maintains tight output accuracy (<±1.5%) across line/load variations. |
Use Scenario: Clamping USB PD negotiation voltage during adapter hot-plug events. IC Role / Device Role: Transient overvoltage suppressor placed between VBUS and GND before protection IC. Use Value: Sub-0.5µA leakage at 9.1V prevents false triggering; 1.5W rating absorbs 8.3ms surge up to 10A IFSM. |
| LED Driver Constant-Voltage Reference | Industrial PLC Input Signal Conditioning |
Use Scenario: Providing stable bias for current-sense amplifier in constant-current LED driver. IC Role / Device Role: Precision voltage reference for op-amp offset calibration and gain setting. Use Value: 12V nominal with <100ppm/°C tempco (per family curve Fig.4) ensures <0.3% drift over -40°C to +85°C. |
Use Scenario: Level-shifting and clamping 24V digital inputs to microcontroller GPIOs. IC Role / Device Role: Input protection element limiting voltage to safe logic levels during ESD or inductive kick. Use Value: Class 3B HBM rating (8kV) and DO-214AC mechanical robustness withstand repeated field ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor 1N4742A | Through-hole DO-41 package; 12V ±5%, 1W PD, 22Ω ZZT at 21mA | Not surface-mount; lower power and higher impedance limit use in compact, high-efficiency SMPS | Select only if legacy through-hole assembly or lower-cost prototyping is required |
| Vishay 1N5242B | DO-35 glass axial package; 12V ±5%, 0.5W PD, 23Ω ZZT at 20mA | Lower power rating and axial form factor unsuitable for automated SMT lines or high-density PCBs | Use only for low-power signal-level referencing where thermal margin is not constrained |
Compared with 1SMA5927, both alternatives offer identical nominal zener voltage but lack its 1.5W surface-mount capability, low 6.5Ω impedance, and Class 3B ESD rating-making 1SMA5927 preferable for modern high-density, high-reliability power designs.
Availability
1SMA5927 is available at Aetrix Electronics and suitable for switching mode power supplies, onboard DC/DC converters, and lighting applications requiring stable component supply with full traceability and lifecycle management.
Supply support for 1SMA5927 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.
The 1SMA59xx series was developed specifically for high-reliability surface-mount voltage regulation in space-constrained power systems, emphasizing thermal robustness, automated assembly compatibility, and stringent process control for ±5% zener tolerance.
FAQ
What is the zener voltage tolerance of the 1SMA5927?
The 1SMA5927 has a zener voltage tolerance of ±5%, specified as 11.40 V (minimum) to 12.60 V (maximum) at test current IZT = 31.2 mA. This tolerance is guaranteed at thermal equilibrium per datasheet Note 2 and applies across the full operating temperature range of -55°C to +150°C.
Can the 1SMA5927 be used in place of a 1N4742A?
The 1SMA5927 is not a direct replacement for the 1N4742A due to differences in package (DO-214AC vs. DO-41), power rating (1.5W vs. 1W), and dynamic impedance (6.5Ω vs. 22Ω). While both provide 12V regulation, the 1SMA5927 requires SMT assembly and delivers tighter regulation under load-use only after verifying board layout, thermal design, and surge requirements.
What is the maximum DC zener current for the 1SMA5927?
The maximum DC zener current (IZM) for the 1SMA5927 is 125 mA, calculated from PD/VZ(min) = 1.5W / 11.40V ≈ 132 mA, with datasheet-specified 125 mA accounting for derating and safety margin. This value assumes proper PCB copper pad thermal management per the 5 mm × 5 mm Cu pad specification.
Does the 1SMA5927 meet RoHS and halogen-free requirements?
Yes, the 1SMA5927 is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants, and all materials conform to EU Directive 2011/65/EU and related amendments, supporting compliance for export to EU, China, Korea, and other regulated markets.
What is the thermal derating behavior of the 1SMA5927 above 75°C?
The 1SMA5927 derates linearly at 20 mW/°C above TL = 75°C when mounted on a 5 mm × 5 mm copper pad, per Absolute Maximum Ratings table. At 100°C lead temperature, allowable power drops to 1.0 W; at 125°C, it falls to 0.5 W. Junction temperature must remain ≤150°C under all operating conditions.
1SMA5927 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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 6.5 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 9.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA5927 FAQ
1.How can I place an order for 1SMA5927 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5927 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 1SMA5927 reliable?
The price and inventory of 1SMA5927 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5927 is usually 5 days.
3.What payment methods are accepted for 1SMA5927?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5927 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5927?
1SMA5927 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5927 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 1SMA5927?
For technical support, including 1SMA5927 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5927 requirements.
6.How does Aetrix verify that 1SMA5927 is sourced from the original manufacturer or authorized distributors?
All 1SMA5927 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 1SMA5927 meets industry standards.
7.What is the process for return or replacement of 1SMA5927?
All 1SMA5927 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5927, 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 1SMA5927 part is unused and in its original packaging.
Return procedure for 1SMA5927:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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