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onsemi SZ1SMA5914BT3G
- Part No.:
- SZ1SMA5914BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5914BT3G.pdf
- Description:
- DIODE ZENER 3.6V 500MW SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,280
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Product details
Overview
SZ1SMA5914BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal reverse breakdown voltage of 3.6 V, maximum zener impedance of 104.2 Ω at 9.0 mA test current, and leakage current ≤1.0 μA at 3.55 V reverse voltage - used for precision voltage regulation in low-power analog circuits and automotive sensor biasing.
For engineers reviewing the SZ1SMA5914BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal resistance (250 °C/W junction-to-ambient), AEC−Q101 qualification, and SMA package compatibility with automated SMT placement.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified zener voltage (3.42–3.78 V) with controlled dynamic impedance. It maintains regulation under DC zener current up to 417 mA and supports stable operation across −65 °C to +150 °C junction temperature range.
The SZ1SMA5914BT3G features Class 3 ESD protection (>16 kV HBM), Pb-free construction, and UL 94 V−0 flammability rating. Its flat handling surface and polarity notch enable accurate top-slide or bottom-board mounting in space-constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.42–3.78 V (±5% tolerance, guaranteed at thermal equilibrium) |
| Power Dissipation (PD) | 0.5 W @ TA = 25°C (derates 4.0 mW/°C above 25°C) |
| Zener Impedance (ZZT) | 104.2 Ω @ IZT = 9.0 mA (defines regulation stiffness under load variation) |
| Leakage Current (IR) | ≤1.0 μA @ VR = 3.55 V (ensures minimal standby power loss) |
| Max DC Zener Current (IZM) | 417 mA (sets absolute upper limit for continuous regulation current) |
| Junction-to-Ambient RJA | 250 °C/W (determines thermal rise under ambient conditions without heatsinking) |
| Operating Temperature | −65 °C to +150 °C (supports under-hood automotive and industrial environments) |
Pinout & Package
Package: SMA (Case 403D), surface-mount, void-free molded plastic with corrosion-resistant solderable leads and cathode polarity band marking. Maximum solder temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked with band) | Reverse-bias anode connection point | Applied positive voltage relative to anode establishes zener conduction and regulated output |
| Anode | Reference ground node | Serves as circuit common; reverse current flows from cathode to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| ESD robustness | Class 3 (>16 kV HBM) enables reliable handling in uncontrolled assembly environments |
| Low-profile SMA package | Enables high-density PCB layouts and replaces MELF diodes without footprint redesign |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles |
| Flat handling surface | Ensures consistent pick-and-place accuracy during automated SMT assembly |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
Use Scenario: Providing stable 3.6 V reference to Hall-effect position sensors in transmission control units. IC Role / Device Role / Timing Role: Zener voltage regulator establishing precise bias voltage for sensor IC input stages. Use Value: Maintains sensor accuracy over −40 °C to +125 °C ambient while surviving automotive load-dump transients. | Use Scenario: Regulating supply voltage for 12-bit ADC front-end circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Two-terminal shunt regulator stabilizing reference rail against supply ripple and load variation. Use Value: Limits voltage drift to ±0.18 V (±5%) across full operating temperature range, preserving ADC linearity. |
| Consumer Power Management | Medical Diagnostic Instrumentation |
Use Scenario: Clamping and regulating auxiliary 3.3 V rail in USB-powered portable diagnostic tools. IC Role / Device Role / Timing Role: Shunt regulator absorbing excess current when LDO output exceeds 3.6 V due to light loading. Use Value: Prevents overvoltage damage to downstream logic with <1.0 μA leakage at 3.55 V, minimizing quiescent drain. | Use Scenario: Generating calibrated bias for photodiode amplifiers in pulse oximetry modules. IC Role / Device Role / Timing Role: Precision voltage reference defining amplifier gain-setting network operating point. Use Value: Delivers <104.2 Ω dynamic impedance at 9 mA, reducing signal-dependent offset drift in low-light conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V6LT1G | 300 mW rating, 350 Ω ZZT @ 5 mA, SOT-23 package | Lower power handling and higher impedance limit use to sub-100 mA regulation | Select when board space is constrained and power demand is ≤300 mW |
| MMSZ4685T1G | 500 mW rating, 100 Ω ZZT @ 10 mA, SOD-123 package | Higher thermal resistance (350 °C/W) reduces usable current at elevated ambient temperatures | Select when cost sensitivity outweighs AEC−Q101 requirement and thermal margin is sufficient |
Compared with SZ1SMA5914BT3G, BZX84-C3V6LT1G offers smaller footprint but lower power and regulation precision, while MMSZ4685T1G matches impedance performance but lacks automotive qualification and has inferior thermal dissipation - making SZ1SMA5914BT3G optimal for thermally demanding, safety-critical designs.
Availability
SZ1SMA5914BT3G is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference, and medical diagnostic instrumentation requiring stable component supply, long-term lifecycle support, and AEC−Q101 compliance.
Supply support for SZ1SMA5914BT3G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZ1SMA59xxBT3G series was developed specifically for automotive-grade voltage regulation, combining AEC−Q101 qualification, high ESD robustness, and stable zener characteristics across extreme temperature ranges.
FAQ
What is the zener voltage tolerance for SZ1SMA5914BT3G?
The SZ1SMA5914BT3G has a zener voltage tolerance of ±5%, with a nominal value of 3.6 V and guaranteed limits of 3.42 V (minimum) and 3.78 V (maximum) at IZT = 9.0 mA and thermal equilibrium. This tolerance is explicitly defined in the Electrical Characteristics table of the onsemi datasheet Rev. 11 and applies to all devices marked SZ1SMA5914BT3G.
Is SZ1SMA5914BT3G suitable for automotive applications?
Yes, SZ1SMA5914BT3G is AEC−Q101 qualified and PPAP capable, with explicit designation in the datasheet for automotive and other applications requiring unique site and control change requirements. Its operating temperature range (−65 °C to +150 °C), ESD rating (>16 kV HBM), and Pb-free construction meet automotive electronics reliability standards.
What is the maximum DC zener current for SZ1SMA5914BT3G?
The maximum DC zener current (IZM) for SZ1SMA5914BT3G is 417 mA, derived from PD = 0.5 W at TA = 25°C and VZ = 3.6 V. This value is listed in the Electrical Characteristics table and represents the highest continuous current the device can regulate without exceeding its power dissipation limit under standard ambient conditions.
How does the thermal resistance affect SZ1SMA5914BT3G performance in PCB designs?
SZ1SMA5914BT3G has a junction-to-ambient thermal resistance (RJA) of 250 °C/W. At 417 mA and 3.6 V, power dissipation reaches 1.5 W - exceeding its 0.5 W ambient-rated limit. Therefore, effective copper pour and airflow are essential; derating begins at 25°C, reducing allowable power by 4.0 mW per °C rise above ambient.
What packaging and marking details identify SZ1SMA5914BT3G on the reel?
SZ1SMA5914BT3G ships in tape-and-reel format (5,000 units per reel) with SMA (Case 403D) package. Devices are marked "814B" on the cathode side, followed by assembly location, year, and work week codes. The "SZ" prefix and "G" suffix confirm automotive qualification and Pb-free compliance per onsemi's marking diagram and ordering information.
SZ1SMA5914BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZ1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 35.5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SZ1SMA5914BT3G FAQ
1.How can I place an order for SZ1SMA5914BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5914BT3G 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 SZ1SMA5914BT3G reliable?
The price and inventory of SZ1SMA5914BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5914BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5914BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5914BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5914BT3G?
SZ1SMA5914BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5914BT3G 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 SZ1SMA5914BT3G?
For technical support, including SZ1SMA5914BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5914BT3G requirements.
6.How does Aetrix verify that SZ1SMA5914BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5914BT3G 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 SZ1SMA5914BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5914BT3G?
All SZ1SMA5914BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5914BT3G, 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 SZ1SMA5914BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5914BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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