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Taiwan Semiconductor Corporation 1SMA5938H
- Part No.:
- 1SMA5938H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5938H.pdf
- Description:
- DIODE ZENER 36V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,290
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Product details
Overview
1SMA5938H from Taiwan Semiconductor is a surface-mount Zener diode engineered for precision voltage regulation in power supply circuits, with a nominal Zener voltage of 36 V, 1.5 W power dissipation, and ±5% tolerance. It features glass-passivated junction, AEC-Q101 qualification, and low leakage current (<0.5 µA at VR = 27.4 V), making it suitable for automotive-grade DC/DC converters and industrial SMPS.
For engineers reviewing the 1SMA5938H datasheet, 1SMA5938H pinout, 1SMA5938H application, or 1SMA5938H equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, thermal performance up to TJ = 150°C, regulated impedance of 850 Ω at IZT = 10.4 mA, and Class 3B HBM ESD rating - all critical for high-reliability embedded power management designs.
Technical Context
The 1SMA5938H operates as a single-die, unidirectional Zener regulator with reverse-biased breakdown behavior. Its electrical behavior is defined by tightly controlled VZ (34.2–37.8 V), dynamic impedance ZZT = 850 Ω at IZT = 10.4 mA, and low IR = 0.5 µA at VR = 27.4 V - ensuring stable reference voltage under varying load and temperature conditions.
Designed for surface-mount assembly on PCBs with 5 mm × 5 mm Cu pads, it supports automated placement and complies with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. Its UL 94V-0 molding compound and matte tin-plated leads meet IPC-J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V (min) to 37.8 V (max) at IZT = 10.4 mA - defines precise regulation window for 36 V nominal systems |
| Power Dissipation (PD) | 1.5 W at TL = 75°C - sets maximum continuous thermal load on PCB copper pad |
| Zener Impedance (ZZT) | 850 Ω at IZT = 10.4 mA - determines output voltage stability under dynamic current changes |
| Leakage Current (IR) | ≤0.5 µA at VR = 27.4 V - ensures minimal standby power loss in high-impedance bias networks |
| Junction Temperature (TJ) | −55°C to +150°C - enables operation in under-hood automotive and industrial ambient environments |
| ESD Rating | Class 3B per JEDEC JESD22-A114 - withstands ≥8 kV HBM, supporting robust handling in manufacturing |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/cathode configuration 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 / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path during regulation |
| Cathode | Reverse-biased breakdown terminal / regulated output node | Connected to input rail; maintains stable 36 V output relative to anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use, including engine control and body modules requiring reliability over temperature and vibration |
| Glass-passivated chip junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure |
| Low inductance construction | Minimizes voltage overshoot during transient events, improving response in fast-switching power supplies |
| Matte tin-plated leads | Ensures consistent solder wetting and intermetallic formation per J-STD-002, reducing voiding risk in reflow |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives for environmentally restricted materials in final assemblies |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Regulating auxiliary 36 V rail in 48 V vehicle architectures for infotainment and ADAS subsystems. IC Role / Device Role / Timing Role: Zener reference element providing stable voltage threshold for feedback loop error amplifiers. Use Value: Maintains ±5% regulation accuracy across −40°C to +125°C ambient, meeting AEC-Q101 thermal stress requirements. |
Use Scenario: Voltage clamping and reference generation in isolated flyback converters delivering 36 V outputs. IC Role / Device Role / Timing Role: Precision shunt regulator defining secondary-side feedback voltage in optocoupler-coupled control loops. Use Value: Low ZZT (850 Ω) minimizes output ripple sensitivity to load transients, improving dynamic regulation performance. |
| LED Driver Bias Network | Programmable Power Supply Reference |
Use Scenario: Setting constant-current threshold in high-voltage LED string drivers operating from 40–60 V bus rails. IC Role / Device Role / Timing Role: Zener clamp establishing fixed bias point for current-sense amplifier inputs. Use Value: Tight VZ tolerance (±5%) ensures repeatable LED current calibration across production batches. |
Use Scenario: Providing stable 36 V reference for DAC-controlled programmable lab power supplies. IC Role / Device Role / Timing Role: Primary voltage reference source feeding into op-amp summing networks for output scaling. Use Value: Low IR (<0.5 µA) prevents loading error in high-impedance reference divider networks, preserving DAC resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | Same nominal VZ (36 V), but ±5% tolerance, 1 W PD, DO-41 through-hole package | Requires PCB through-hole layout; unsuitable for automated SMT lines or space-constrained boards | Select when legacy through-hole design or manual prototyping is required; not drop-in compatible with 1SMA5938H footprint |
| BZX84-C36 | 36 V Zener, SOT-23 package, 300 mW PD, higher ZZT (~100 Ω typical), ±5% tolerance | Limited power handling; unsuitable for >100 mA regulation or sustained thermal loads | Choose for low-power bias networks where board area is critical and power dissipation remains <300 mW |
Compared with 1N4738A and BZX84-C36, the 1SMA5938H delivers 1.5 W power capability in a surface-mount DO-214AC package with automotive-grade reliability - enabling higher-current regulation without thermal derating penalties or layout redesign.
Availability
1SMA5938H is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and LED driver bias networks requiring stable component supply with full traceability and lifecycle support.
Supply support for 1SMA5938H 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 automotive, industrial, and consumer markets.
The 1SMA5938H belongs to TSC's AEC-Q101-qualified SMA Zener series, designed specifically for high-reliability voltage regulation in harsh-environment power conversion systems where thermal stability and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance for 1SMA5938H?
The 1SMA5938H has a Zener voltage tolerance of ±5%, with a specified range of 34.2 V (minimum) to 37.8 V (maximum) at test current IZT = 10.4 mA. This tolerance is guaranteed at thermal equilibrium and applies across the full operating temperature range of −55°C to +150°C. The 1SMA5938H achieves this tight tolerance via laser trimming during wafer sort, ensuring batch-to-batch consistency for precision regulation applications.
Is 1SMA5938H suitable for automotive applications?
Yes, the 1SMA5938H is AEC-Q101 qualified and rated for operation from −55°C to +150°C junction temperature, making it suitable for under-hood and cabin automotive applications such as 48 V system DC/DC converters and body control modules. Its glass-passivated junction, Class 3B HBM ESD rating, and JESD201 Class 2 whisker resistance further validate its suitability for automotive-grade production. The 1SMA5938H meets all stress-test requirements defined in the AEC-Q101 standard.
What is the maximum DC Zener current (IZM) for 1SMA5938H?
The maximum DC Zener current (IZM) for 1SMA5938H is 42 mA, calculated from its 1.5 W power rating and nominal 36 V Zener voltage (IZM = PD / VZ ≈ 1.5 W / 36 V). This value is confirmed in the Electrical Specifications table and represents the highest continuous current the 1SMA5938H can regulate without exceeding its thermal limits at TL = 75°C on a 5 mm × 5 mm Cu pad. Derating applies above 75°C ambient.
Does 1SMA5938H have a halogen-free construction?
Yes, the 1SMA5938H is halogen-free in accordance with IEC 61249-2-21 and fully RoHS compliant. Its molding compound contains no brominated flame retardants or chlorine-based additives, and all plating materials meet EU Directive 2011/65/EU requirements. This makes the 1SMA5938H suitable for environmentally regulated end equipment, including industrial automation and consumer electronics sold in Europe and Asia.
What is the thermal resistance (RθJA) of 1SMA5938H?
The datasheet does not specify RθJA directly for 1SMA5938H; instead, it provides power derating data based on lead temperature (TL): 1.5 W at TL = 75°C, with linear derating of 20 mW/°C above that point. For PCB-level thermal modeling, the 1SMA5938H is characterized using a 5 mm × 5 mm Cu pad test board per JEDEC standards. Actual RθJA depends on board layout, copper area, and airflow - typical values for DO-214AC packages on 1 oz. Cu range from 120°C/W to 180°C/W.
1SMA5938H 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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 38 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 27.4 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)
1SMA5938H FAQ
1.How can I place an order for 1SMA5938H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5938H 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 1SMA5938H reliable?
The price and inventory of 1SMA5938H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5938H is usually 5 days.
3.What payment methods are accepted for 1SMA5938H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5938H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5938H?
1SMA5938H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5938H 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 1SMA5938H?
For technical support, including 1SMA5938H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5938H requirements.
6.How does Aetrix verify that 1SMA5938H is sourced from the original manufacturer or authorized distributors?
All 1SMA5938H 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 1SMA5938H meets industry standards.
7.What is the process for return or replacement of 1SMA5938H?
All 1SMA5938H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5938H, 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 1SMA5938H part is unused and in its original packaging.
Return procedure for 1SMA5938H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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