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Taiwan Semiconductor Corporation 1SMA5948
- Part No.:
- 1SMA5948
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5948.pdf
- Description:
- DIODE ZENER 91V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,085
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Product details
Overview
1SMA5948 from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with a nominal zener voltage of 91V (±5%), 4.1Ω dynamic impedance at 200mA test current, and maximum leakage current of 0.5µA at 69.2V reverse bias. It features glass-passivated junction, DO-214AC (SMA) package, and is used for precision voltage regulation in DC/DC converters and power supply feedback loops.
For engineers reviewing the 1SMA5948 datasheet, 1SMA5948 pinout, 1SMA5948 application, or 1SMA5948 equivalent, key selection criteria include its 91V zener tolerance, 1.5W power rating at TL=75°C, low-inductance SMA package, and Class 3B HBM ESD rating - all critical for stable overvoltage clamping and reference stability in compact power designs.
Technical Context
The 1SMA5948 operates as a single-die, unidirectional Zener regulator optimized for steady-state voltage reference and transient suppression. Its 91V nominal breakdown is guaranteed at thermal equilibrium with ±5% tolerance, and it maintains regulation under DC currents up to 16mA (IZM) while exhibiting only 4.1Ω dynamic impedance at IZT = 200mA.
Designed for surface-mount assembly on 5mm × 5mm Cu pads, the device supports 10A peak forward surge current (8.3ms half-sine), operates across –55°C to +150°C junction temperature 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 |
|---|---|
| Zener Voltage (VZ) | 86.45–95.55 V (±5% tolerance at IZT = 200 mA; defines precise regulation point) |
| Power Dissipation (PD) | 1.5 W (rated at lead temperature TL = 75°C; derates 20 mW/°C above 75°C) |
| Dynamic Impedance (ZZT) | 4.1 Ω (measured at IZT = 200 mA; ensures tight voltage regulation under load variation) |
| Leakage Current (IR) | < 0.5 µA at VR = 69.2 V (confirms minimal standby power loss in high-impedance bias networks) |
| Junction Temperature (TJ) | –55°C to +150°C (enables operation in industrial and automotive under-hood environments) |
| ESD Rating | Class 3B per JEDEC JS-001 (≥8 kV HBM; supports robust handling in automated SMT lines) |
| Package | DO-214AC (SMA); 0.060 g mass; matte tin-plated leads compliant with J-STD-002 solderability |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with cathode band marking polarity; 2-terminal axial configuration; dimensions per Taiwan Semiconductor outline drawing (L = 4.2–4.7 mm, W = 2.5–2.9 mm, H = 2.1–2.5 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail during reverse-biased regulation |
| Cathode | Zener breakdown terminal / Voltage reference output | Provides stable 91V reference when reverse-biased; marked by visible band on body |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures long-term parameter stability and reduced parameter drift under thermal cycling |
| Low inductance construction | Minimizes voltage overshoot during fast transients; critical for SMPS feedback loop integrity |
| UL 94V-0 molding compound | Meets flame-retardant safety requirements for enclosed power electronics and lighting systems |
| RoHS and halogen-free compliance | Fulfills IEC 61249-2-21 and environmental directives for global industrial and consumer shipments |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Voltage feedback network in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener reference element setting optocoupler LED current threshold for primary-side PWM controller. Use Value: Tight 91V tolerance and low ZZT ensure accurate output voltage setpoint despite line/load variation. |
Use Scenario: Output voltage clamp and reference in non-isolated buck converter for FPGA core supply. IC Role / Device Role / Timing Role: Standby reference diode in feedback divider, stabilizing error amplifier input under light-load conditions. Use Value: Sub-0.5µA leakage at 69.2V prevents bias current error in high-resistance feedback networks. |
| Lighting Application | Adapter Protection Circuit |
Use Scenario: Overvoltage protection for LED driver ICs in constant-current streetlight modules. IC Role / Device Role / Timing Role: Shunt clamp limiting bus voltage during hot-swap or capacitor charging surges. Use Value: 10A IFSM rating and 1.5W dissipation enable reliable single-pulse energy absorption without failure. |
Use Scenario: Input rail clamping in universal AC/DC wall adapters to suppress line transients. IC Role / Device Role / Timing Role: Primary-side transient voltage suppressor placed across bulk capacitor terminals. Use Value: Class 3B ESD rating and J-STD-020 Level 1 moisture resistance support high-yield automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 91V ±5%, 1W rating, DO-41 package (axial lead), higher ZZT = 10Ω at 21mA | Not surface-mount; requires through-hole PCB layout and manual/semi-auto insertion | Choose only if legacy through-hole design or cost-sensitive non-SMT production is required |
| SMAZ91 | 91V ±5%, 1.5W, DO-214AC package, but ZZT = 5.0Ω at 200mA and IR ≤ 1.0µA at 73V | Higher leakage and slightly higher impedance reduce reference accuracy in precision feedback paths | Acceptable where tighter leakage or lower ZZT is not critical; verify thermal margin at full load |
Compared with 1SMA5948, 1N4749A offers identical voltage but lacks SMT compatibility and thermal performance, while SMAZ91 matches the package and power rating but trades off regulation precision and leakage for broader availability - making 1SMA5948 optimal for space-constrained, high-accuracy DC/DC feedback designs.
Availability
1SMA5948 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for 1SMA5948 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, computing, and consumer markets.
The 1SMA59xx series was designed specifically for high-reliability, surface-mount voltage regulation in compact power conversion systems - emphasizing thermal robustness, tight voltage tolerance, and automated assembly compatibility.
FAQ
What is the zener voltage tolerance for 1SMA5948?
The 1SMA5948 has a nominal zener voltage of 91V with a tolerance of ±5%, meaning the actual measured VZ falls between 86.45V and 95.55V when tested at IZT = 200mA under thermal equilibrium conditions. This tolerance is guaranteed per Taiwan Semiconductor's L2102 specification and applies across the full operating temperature range.
Can 1SMA5948 be used in place of 1N4749A?
No - while both have 91V nominal zener voltage, 1SMA5948 uses a DO-214AC (SMA) surface-mount package and is rated for 1.5W at TL = 75°C, whereas 1N4749A is DO-41 axial-leaded and rated for only 1W. Their thermal paths, mounting methods, and dynamic impedance (4.1Ω vs. 10Ω) differ significantly, making direct substitution invalid without board redesign and thermal revalidation.
What is the maximum DC zener current (IZM) for 1SMA5948?
The maximum DC zener current for 1SMA5948 is 16mA, calculated from PD = 1.5W and VZ = 91V (IZM = PD/VZ). This value is confirmed in the Electrical Specifications table and represents the highest continuous current the device can regulate without exceeding its power limit at rated junction temperature.
Does 1SMA5948 meet RoHS and halogen-free requirements?
Yes - 1SMA5948 is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet (Version L2102). The molding compound contains no brominated flame retardants, and lead content is below 1000 ppm, satisfying EU Directive 2011/65/EU and related global environmental standards.
What is the leakage current specification for 1SMA5948 at 69.2V?
At VR = 69.2V (80% of nominal VZ), the 1SMA5948 exhibits a maximum leakage current (IR) of 0.5µA, as specified in the Electrical Specifications table. This ultra-low leakage enables use in high-impedance voltage divider networks where bias current error must remain below 1% of total feedback current.
1SMA5948 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):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 69.2 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)
1SMA5948 FAQ
1.How can I place an order for 1SMA5948 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5948 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 1SMA5948 reliable?
The price and inventory of 1SMA5948 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5948 is usually 5 days.
3.What payment methods are accepted for 1SMA5948?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5948 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5948?
1SMA5948 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5948 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 1SMA5948?
For technical support, including 1SMA5948 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5948 requirements.
6.How does Aetrix verify that 1SMA5948 is sourced from the original manufacturer or authorized distributors?
All 1SMA5948 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 1SMA5948 meets industry standards.
7.What is the process for return or replacement of 1SMA5948?
All 1SMA5948 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5948, 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 1SMA5948 part is unused and in its original packaging.
Return procedure for 1SMA5948:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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