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Taiwan Semiconductor Corporation 1SMA5937H
- Part No.:
- 1SMA5937H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5937H.pdf
- Description:
- DIODE ZENER 33V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,088
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Product details
Overview
1SMA5937H from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with nominal zener voltage of 33V, ±5% tolerance, 11.4Ω dynamic impedance at 33mA test current, and maximum leakage current of 0.5µA at 25.1V reverse bias. It operates within −55°C to +150°C junction temperature range and is used for precision voltage regulation in DC/DC converters and power supply feedback loops.
For engineers reviewing the 1SMA5937H datasheet, 1SMA5937H pinout, 1SMA5937H application, or 1SMA5937H equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, AEC-Q101 qualification for automotive use, low-inductance glass-passivated junction, and verified 33V regulation under 33mA IZT.
Technical Context
The 1SMA5937H functions as a single-die, unidirectional voltage reference device with sharp reverse-breakdown characteristics. Its zener voltage is specified at thermal equilibrium with 33mA test current, and it maintains regulation across −55°C to +150°C operating junction temperature.
It features low dynamic impedance (11.4Ω at IZT), minimal leakage (<0.5µA at VR = 25.1V), and is rated for 10A non-repetitive forward surge current. The device uses a glass-passivated chip junction and matte tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.35–34.65 V at 33 mA - defines stable regulation window for feedback sensing |
| Power Dissipation (PD) | 1.5 W at TL = 75°C - sets thermal design limit on PCB copper pad area |
| Dynamic Impedance (ZZT) | 11.4 Ω at IZT = 33 mA - ensures tight voltage stability under load variation |
| Leakage Current (IR) | <0.5 µA at VR = 25.1 V - minimizes standby power loss in high-impedance circuits |
| Junction Temperature (TJ) | −55°C to +150°C - supports operation in under-hood automotive and industrial environments |
| ESD Rating | Class 3B (HBM) per JEDEC - withstands ≥8 kV human-body-model discharge without degradation |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case with cathode band marking. Weight: 0.060 g. Molding compound meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common or feedback divider low-side; polarity critical for regulation |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to feedback divider high-side or voltage sense point; marked by visible band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Glass-passivated chip junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress |
| Low inductance construction | Minimizes ringing and overshoot in fast-switching SMPS feedback paths |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking or dry-pack handling |
| RoHS and halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Primary-side voltage sensing and overvoltage protection in flyback controllers. IC Role / Device Role / Timing Role: Zener reference for TL431-like feedback loop or direct OVP clamp. Use Value: 33V regulation threshold enables precise 3.3V/5V rail monitoring with margin against transient spikes. |
Use Scenario: Output voltage regulation in isolated buck-derived converters for microcontroller power domains. IC Role / Device Role / Timing Role: Secondary-side voltage reference in optocoupler feedback networks. Use Value: Low 11.4Ω ZZT ensures <±1% output voltage deviation across 10–100% load range. |
| Lighting Application | Adapter |
Use Scenario: Constant-current LED driver reference in offline AC/DC LED ballasts. IC Role / Device Role / Timing Role: Voltage clamp for current-sense amplifier biasing or overvoltage shutdown trigger. Use Value: AEC-Q101 qualification supports extended lifetime in thermally stressed LED housing environments. |
Use Scenario: Secondary-side regulation in universal-input wall adapters (90–264 VAC). IC Role / Device Role / Timing Role: Feedback reference for PWM controller ICs such as UC3842 or VIPer series. Use Value: 1.5W power rating accommodates sustained 33V/30mA operation during adapter no-load or light-load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 33V ±5%, 1W rating, DO-41 through-hole package, higher ZZT (17Ω) | Not suitable for automated SMT assembly; limited thermal performance in compact layouts | Select only if legacy through-hole design or lower-cost prototyping is required |
| BZX84-C33 | 33V ±5%, 300mW rating, SOT-23 package, ZZT = 90Ω at 5mA | Lower power capability restricts use to signal-level references, not power regulation | Prefer for low-current biasing or logic-level clamping where space is critical |
Compared with 1SMA5937H, the 1N4745A offers identical voltage but lacks AEC-Q101 qualification and SMT compatibility, while the BZX84-C33 sacrifices power handling and regulation accuracy for footprint reduction-making 1SMA5937H optimal for automotive-grade, 1.5W surface-mount voltage reference needs.
Availability
1SMA5937H is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, automotive-grade reliability, and consistent 33V regulation performance.
Supply support for 1SMA5937H 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 with global distribution and AEC-Q101 validation capabilities.
The 1SMA59xxH series is designed specifically for high-reliability, surface-mount voltage regulation in automotive and industrial power conversion systems-emphasizing thermal robustness, low leakage, and automated assembly compatibility.
FAQ
What is the zener voltage tolerance for 1SMA5937H?
The 1SMA5937H has a zener voltage tolerance of ±5%, with a guaranteed range of 31.35 V to 34.65 V at 33 mA test current (IZT). This tolerance is confirmed per the electrical specifications table in the official Taiwan Semiconductor datasheet Version A2102 and applies under thermal equilibrium conditions.
Is 1SMA5937H suitable for automotive applications?
Yes, the 1SMA5937H is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, high-temperature reverse bias, and ESD (Class 3B HBM). Its −55°C to +150°C junction temperature range and glass-passivated junction make it appropriate for under-hood and body-control module applications where 1SMA5937H serves as a stable voltage reference.
What is the maximum DC zener current for 1SMA5937H?
The maximum DC zener current (IZM) for 1SMA5937H is 45 mA, calculated from its 1.5 W power rating and nominal 33 V zener voltage (PD/VZ ≈ 45.5 mA). The datasheet specifies 45 mA as the absolute maximum continuous current to maintain safe thermal operation at TL = 75°C.
Does 1SMA5937H have moisture sensitivity concerns in SMT assembly?
No, the 1SMA5937H is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking or dry-pack handling-reducing manufacturing complexity and cost for high-volume SMT lines using 1SMA5937H.
How does the dynamic impedance of 1SMA5937H affect regulation accuracy?
The 1SMA5937H exhibits 11.4 Ω dynamic impedance (ZZT) at 33 mA, which means a 10 mA load change induces ~114 mV output shift. This low ZZT ensures tight regulation in feedback networks-critical for maintaining ±1% output accuracy in DC/DC converters where 1SMA5937H provides the reference voltage.
1SMA5937H 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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 25.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA5937H FAQ
1.How can I place an order for 1SMA5937H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5937H 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 1SMA5937H reliable?
The price and inventory of 1SMA5937H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5937H is usually 5 days.
3.What payment methods are accepted for 1SMA5937H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5937H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5937H?
1SMA5937H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5937H 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 1SMA5937H?
For technical support, including 1SMA5937H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5937H requirements.
6.How does Aetrix verify that 1SMA5937H is sourced from the original manufacturer or authorized distributors?
All 1SMA5937H 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 1SMA5937H meets industry standards.
7.What is the process for return or replacement of 1SMA5937H?
All 1SMA5937H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5937H, 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 1SMA5937H part is unused and in its original packaging.
Return procedure for 1SMA5937H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA5937H Tags
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