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onsemi 1SMA5924BT3
- Part No.:
- 1SMA5924BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5924BT3.pdf
- Description:
- DIODE ZENER 9.1V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,762
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Product details
Overview
1SMA5924BT3 from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 9.1 V, ±5% tolerance, 41.2 Ω maximum zener impedance at 7.0 mA test current, and 0.5 μA maximum leakage current at 7.28 V reverse voltage. It operates from −65 °C to +150 °C and is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1SMA5924BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal resistance (50 °C/W junction-to-lead), low-profile SMA package compatibility, and AEC−Q101 qualification status for automotive-grade reliability.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its zener voltage is specified at IZT = 7.0 mA with guaranteed min/typ/max values of 8.64 V / 9.1 V / 9.56 V and temperature coefficient optimized for stable regulation across industrial temperature ranges.
It features Class 3 ESD rating (>16 kV HBM), Pb-free construction (G-suffix variant), and UL 94 V−0 flammability compliance. The SMA package (Case 403D−02) supports top-slide or bottom-board mounting with cathode polarity indicated by molded band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.64–9.56 V @ IZT = 7.0 mA - defines regulated output voltage range under nominal bias |
| Power Dissipation (PD) | 1.5 W @ TL = 75 °C - usable power handling with zero-lead-length thermal condition |
| Zener Impedance (ZZT) | 41.2 Ω max @ IZT = 7.0 mA - determines regulation stiffness and AC ripple rejection |
| Leakage Current (IR) | 0.5 μA max @ VR = 7.28 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RJL) | 50 °C/W - enables thermal design with copper pad heatsinking for sustained 1.5 W operation |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated SMT assembly environments |
| Operating Temperature | −65 °C to +150 °C - suitable for under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: SMA (Surface Mount Assembly), Case 403D−02 - low-profile plastic package with flat handling surface, UL 94 V−0 rated, designed for top-slide or bottom-board mounting. Cathode identified by molded polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Reverse-biased terminal | Connected to regulated output node; voltage referenced to anode; polarity critical for correct breakdown conduction |
| Anode | Reference/ground terminal | Typically tied to system ground or lower-potential rail; establishes reference point for zener voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| ±5% zener voltage tolerance | Guarantees tight regulation window (8.64–9.56 V) without post-manufacture trimming |
| AEC−Q101 qualified (SZ prefix variants) | Validated for automotive applications including engine control modules and body electronics |
| Low-profile SMA package | Enables high-density PCB layouts and replaces MELF diodes without rework of board space |
| 16 kV HBM ESD rating | Eliminates need for external ESD protection during pick-and-place and functional testing |
| Pb-free (RoHS-compliant) option | SZ1SMA5924BT3G variant meets global environmental compliance requirements |
Applications
| Power Supply Feedback Regulation | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in isolated DC-DC converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 9.1 V threshold for error signal generation. Use Value: Maintains ±1% output regulation across line/load/temperature with minimal drift due to low dynamic impedance (41.2 Ω). |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on sensor input lines. IC Role / Device Role / Timing Role: Shunt clamping element limiting voltage to 9.56 V maximum during ESD or surge events. Use Value: Absorbs up to 1.5 W transient energy without degradation, leveraging 16 kV HBM rating and fast response. |
| Automotive Sensor Biasing | Industrial Reference Divider |
Use Scenario: Providing stable bias voltage for analog pressure or temperature sensors in engine management systems. IC Role / Device Role / Timing Role: Low-drift voltage reference source operating continuously at −40 °C to +125 °C ambient. Use Value: Delivers consistent 9.1 V reference despite wide thermal cycling, validated per AEC−Q101 stress tests. |
Use Scenario: Generating precise mid-rail voltage in 18 V industrial PLC analog input stages. IC Role / Device Role / Timing Role: Zener-based voltage divider leg ensuring accurate 9.1 V node in resistor-string references. Use Value: Enables <1% total error budget via guaranteed 5% tolerance and low ZZT-induced loading effects. |
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-C9V1 | 300 mW SOT-23 package; 9.1 V ±5%; ZZT = 60 Ω @ 5 mA | Lower power rating limits use to low-current biasing; not AEC−Q101 qualified | Select when board space is constrained and power dissipation ≤300 mW suffices |
| 1N4739A | 1 W DO-41 through-hole; 9.1 V ±5%; ZZT = 8 Ω @ 19 mA; no AEC−Q101 or Pb-free G-suffix | Requires through-hole assembly; lacks automotive qualification and RoHS compliance | Select only for legacy through-hole designs where reflow compatibility is not required |
Compared with BZX84-C9V1 and 1N4739A, the 1SMA5924BT3 provides higher power handling (1.5 W), superior thermal performance (50 °C/W RJL), and automotive-grade qualification-making it optimal for modern SMT-based power regulation where reliability and density are critical.
Availability
1SMA5924BT3 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor conditioning, and consumer DC-DC converter feedback applications requiring stable component supply and long-term lifecycle support.
Supply support for 1SMA5924BT3 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The 1SMA5924BT3 belongs to the 1SMA59xxBT3/SZ1SMA59xxBT3G series of 1.5 W surface-mount Zener regulators, engineered for high-reliability voltage reference and clamping in space-constrained, thermally demanding environments.
FAQ
What is the zener voltage tolerance of the 1SMA5924BT3?
The 1SMA5924BT3 has a ±5% zener voltage tolerance, meaning its reverse breakdown voltage is guaranteed between 8.64 V and 9.56 V when tested at IZT = 7.0 mA and TA = 25 °C. This tolerance is explicitly defined in the Electrical Characteristics table and applies to all units regardless of marking suffix.
Is the 1SMA5924BT3 suitable for automotive applications?
The SZ1SMA5924BT3G variant of the 1SMA5924BT3 is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control units and body electronics. The standard 1SMA5924BT3 (non-SZ prefix) is not AEC−Q101 qualified.
What is the maximum power dissipation of the 1SMA5924BT3 at 75°C lead temperature?
The 1SMA5924BT3 delivers 1.5 W maximum DC power dissipation at TL = 75 °C with zero lead length, derating linearly at 20 mW/°C above that temperature. This rating assumes a 1 in² copper pad on FR-4 board per datasheet Note 1.
Does the 1SMA5924BT3 have a Pb-free option?
Yes-the SZ1SMA5924BT3G variant is the Pb-free (RoHS-compliant) version of the 1SMA5924BT3, indicated by the "G" suffix in the part number and confirmed in the Ordering Information table and Device Marking section.
What is the thermal resistance junction-to-lead (RJL) for the 1SMA5924BT3?
The thermal resistance junction-to-lead (RJL) for the 1SMA5924BT3 is 50 °C/W, measured under standardized zero-lead-length conditions. This value enables accurate thermal modeling when mounted on PCBs with appropriate copper thermal pads.
1SMA5924BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA5924BT3 FAQ
1.How can I place an order for 1SMA5924BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5924BT3 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 1SMA5924BT3 reliable?
The price and inventory of 1SMA5924BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5924BT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5924BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5924BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5924BT3?
1SMA5924BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5924BT3 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 1SMA5924BT3?
For technical support, including 1SMA5924BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5924BT3 requirements.
6.How does Aetrix verify that 1SMA5924BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5924BT3 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 1SMA5924BT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5924BT3?
All 1SMA5924BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5924BT3, 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 1SMA5924BT3 part is unused and in its original packaging.
Return procedure for 1SMA5924BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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