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onsemi SZ1SMA5924BT3G
- Part No.:
- SZ1SMA5924BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5924BT3G.pdf
- Description:
- DIODE ZENER 9.1V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:19,297
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Product details
Overview
SZ1SMA5924BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 9.1 V, maximum zener impedance of 41.2 Ω at 4.0 mA test current, and reverse leakage current ≤0.5 μA at 7.0 V; used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the SZ1SMA5924BT3G 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 status, and SMA package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased mode, maintaining stable output voltage across load and line variations. Its 9.1 V nominal breakdown is specified at IZT = 4.0 mA with 5% tolerance, and it exhibits low dynamic impedance (41.2 Ω) to minimize regulation error under transient load changes.
The SZ1SMA5924BT3G features Class 3 ESD robustness (>16 kV HBM), Pb-free construction, and UL 94 V-0 flammability rating. It is rated for operation from −65 °C to +150 °C and supports top-slide or bottom-board mounting in the low-profile SMA package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 9.1 V - Stable regulation point at 4.0 mA test current, ±5% tolerance ensures predictable clamping in feedback networks. |
| Power Dissipation (TA=25°C) | 0.5 W - Maximum continuous power at room ambient; derates linearly above 25°C (4.0 mW/°C). |
| Zener Impedance (ZZT) | 41.2 Ω @ 4.0 mA - Low dynamic resistance enables tight voltage regulation under varying load currents. |
| Reverse Leakage (IR) | ≤0.5 μA @ 7.0 V - Minimal off-state current preserves efficiency in high-impedance bias networks. |
| Thermal Resistance (RJA) | 250 °C/W - Junction-to-ambient thermal path limits temperature rise during sustained dissipation. |
| ESD Rating (HBM) | Class 3 (>16 kV) - Robust handling in automated manufacturing and end-use environments. |
| Operating Temp Range | −65 °C to +150 °C - Suitable for under-hood automotive and industrial control applications. |
Pinout & Package
Package: SMA (Case 403D), surface-mount, low-profile plastic package with flat handling surface and cathode band marking; RoHS-compliant, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band End) | High-side terminal in reverse-bias configuration | Connected to regulated output node; polarity band must align with PCB silkscreen for correct orientation. |
| Anode | Low-side terminal / reference ground | Tied to system ground or feedback divider common point; defines reference potential for zener conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing. |
| Flat Handling Surface | Enables precise pick-and-place placement accuracy in high-speed SMT lines without tombstoning. |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements. |
| Low Profile Package | Height ≤1.7 mm allows use in space-constrained modules such as DC-DC converter subassemblies. |
| Top-Slide Mounting Support | Package geometry permits direct thermal coupling to heatsink pads or copper planes via solder reflow. |
Applications
| Switch-Mode Power Supply Feedback | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters by sensing secondary-side voltage through optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise trip threshold for TL431-like shunt regulator ICs or discrete op-amp comparators. Use Value: 9.1 V nominal voltage and 41.2 Ω impedance ensure <±1% output regulation across line/load transients. | Use Scenario: Protects microcontroller I/O pins and sensor interfaces against load-dump surges in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Standalone overvoltage clamp placed between protected node and chassis ground. Use Value: Withstands >16 kV ESD events and operates reliably from −40 °C to +125 °C per AEC-Q101 requirements. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller Input Protection |
Use Scenario: Stabilizes excitation voltage for 4–20 mA current-loop transmitters in process automation equipment. IC Role / Device Role / Timing Role: Precision voltage reference for DAC output buffering or analog front-end biasing. Use Value: 0.5 μA leakage at 7.0 V minimizes error in high-impedance sensor bias networks. | Use Scenario: Shields digital input circuitry from field-induced transients in factory-floor PLC modules. IC Role / Device Role / Timing Role: Primary clamping device in multi-stage TVS+Zener protection architecture. Use Value: 1.5 W peak power rating and 250 °C/W RJA enable reliable surge energy absorption without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMA5924BT3G | No AEC-Q101 qualification; identical electrical specs and SMA package. | Not suitable for automotive production; acceptable for industrial/commercial designs. | Select when AEC-Q101 compliance is not required and cost sensitivity is higher. |
| BZX84-C9V1 | Lower power rating (300 mW), higher Zener impedance (90 Ω), SOT-23 package. | Limited to low-current biasing; unsuitable for >10 mA regulation or surge clamping. | Choose only for space-constrained, low-power signal-level references where 9.1 V tolerance is acceptable. |
Compared with SZ1SMA5924BT3G, the 1SMA5924BT3G offers identical regulation performance but lacks automotive qualification, while BZX84-C9V1 trades power handling and impedance for smaller footprint-making SZ1SMA5924BT3G optimal for robust, medium-power voltage reference needs.
Availability
SZ1SMA5924BT3G is available at Aetrix Electronics and suitable for switch-mode power supplies, automotive electronic control units, and industrial sensor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SZ1SMA5924BT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT markets.
The 1SMA59xxBT3G/SZ1SMA59xxBT3G series was designed specifically for high-reliability voltage regulation in automotive and industrial power systems, emphasizing AEC-Q101 compliance, thermal stability, and SMT manufacturability.
FAQ
What is the nominal zener voltage of SZ1SMA5924BT3G and how is it tested?
The nominal zener voltage of SZ1SMA5924BT3G is 9.1 V, measured at a test current (IZT) of 4.0 mA under thermal equilibrium conditions at TA = 25°C. This value falls within the guaranteed range of 8.64 V (min) to 9.56 V (max), reflecting its ±5% tolerance grade. The device maintains this regulation point across its full operating temperature range.
Is SZ1SMA5924BT3G qualified for automotive applications?
Yes, SZ1SMA5924BT3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive electronic control units, body electronics, and infotainment systems. The "SZ" prefix explicitly denotes compliance with automotive-specific site and change control requirements, distinguishing it from the commercial-grade 1SMA5924BT3G variant.
What is the maximum power dissipation of SZ1SMA5924BT3G at ambient temperature?
SZ1SMA5924BT3G has a maximum DC power dissipation of 0.5 W at TA = 25°C. Above this temperature, it derates linearly at 4.0 mW/°C up to 125°C ambient, after which operation is not recommended. This rating assumes use of onsemi's minimum recommended FR-4 footprint with adequate copper area for heat spreading.
How does the zener impedance of SZ1SMA5924BT3G affect voltage regulation accuracy?
The zener impedance (ZZT) of SZ1SMA5924BT3G is 41.2 Ω at IZT = 4.0 mA. This low dynamic resistance ensures minimal voltage deviation under load current changes-e.g., a 1 mA variation in zener current causes only ~41 mV shift in output voltage. This directly improves regulation accuracy in feedback and reference circuits.
What package type and mounting orientation does SZ1SMA5924BT3G use?
SZ1SMA5924BT3G uses the SMA (DO-214AC, Case 403D) surface-mount package with a flat handling surface and molded cathode band. It supports both top-slide and bottom-circuit board mounting. The cathode (band end) must be aligned with the PCB silkscreen polarity indicator to ensure correct reverse-bias operation.
SZ1SMA5924BT3G 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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 2.5 µA @ 7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SZ1SMA5924BT3G FAQ
1.How can I place an order for SZ1SMA5924BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5924BT3G 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 SZ1SMA5924BT3G reliable?
The price and inventory of SZ1SMA5924BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5924BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5924BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5924BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5924BT3G?
SZ1SMA5924BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5924BT3G 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 SZ1SMA5924BT3G?
For technical support, including SZ1SMA5924BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5924BT3G requirements.
6.How does Aetrix verify that SZ1SMA5924BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5924BT3G 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 SZ1SMA5924BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5924BT3G?
All SZ1SMA5924BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5924BT3G, 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 SZ1SMA5924BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5924BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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