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onsemi 1SMB5923BT3G
- Part No.:
- 1SMB5923BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5923BT3G.pdf
- Description:
- DIODE ZENER 8.2V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
1SMB5923BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 8.2 V, maximum Zener impedance of 45.7 Ω at 3.5 mA test current, and reverse leakage current ≤0.5 μA at 6.5 V. It features AEC-Q101 qualification (SZ variant), ESD rating >16 kV HBM, and UL 94 V-0 flammability compliance. It serves as a precision voltage reference or overvoltage clamp in DC power rails for automotive control modules.
For engineers reviewing the 1SMB5923BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (226 °C/W at TA = 25°C), junction temperature range (−65 to +150°C), and SMB package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal, unidirectional voltage regulator in reverse-biased mode, maintaining stable output voltage across varying load currents within its 3 W steady-state power limit at TL = 75°C. Its Zener breakdown mechanism provides predictable clamping behavior with low dynamic impedance (45.7 Ω) at IZT = 3.5 mA.
The SMB (Case 403A) package enables top-side or bottom-side PCB mounting, with modified L-bend leads for enhanced solder joint reliability and flat handling surface for accurate placement. Thermal derating follows linear 4.4 mW/°C reduction above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79–8.61 V (±5% tolerance at IZT = 3.5 mA; defines regulated voltage window) |
| Max Power Dissipation (PD) | 550 mW at TA = 25°C; derates to 3.0 W only at TL = 75°C with zero lead length |
| Zener Impedance (ZZT) | 45.7 Ω max at IZT = 3.5 mA; determines regulation stiffness under small-signal AC load variation |
| Reverse Leakage (IR) | ≤0.5 μA at VR = 6.5 V; ensures minimal standby current in clamping applications |
| Thermal Resistance (RJA) | 226 °C/W (FR-4 board, recommended footprint); dictates required copper area for thermal management |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; supports robustness in automotive and industrial handling environments |
| Junction Temp Range | −65°C to +150°C; enables operation in under-hood automotive or high-ambient industrial settings |
Pinout & Package
SMB (Case 403A) surface-mount plastic package with cathode indicated by polarity band; void-free transfer-molded construction, Pb-free, UL 94 V-0 rated, and compatible with reflow soldering (260°C for 10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated rail; forms reference ground for Zener bias network |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential side; delivers stable 8.2 V reference or clamps transients above VZ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (SZ variant) | Validated for automotive electronics use with PPAP support and controlled change management |
| ESD robustness >16 kV HBM | Reduces risk of field failure during handling or system-level ESD events without external protection |
| Flat handling surface | Enables consistent pick-and-place accuracy in high-speed SMT lines, minimizing tombstoning |
| Modified L-bend leads | Increases solder pad contact area for improved mechanical strength and thermal conduction |
| Pb-free and RoHS compliant | Meets global environmental regulations and supports lead-free reflow profiles without reliability compromise |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping transient spikes on 12 V sensor supply rail in engine bay environment. IC Role / Device Role / Timing Role: Two-terminal voltage clamp protecting downstream analog front-end ICs from load-dump-induced overvoltage. Use Value: Limits voltage to ≤8.61 V during 100 V/100 ms load dump events, preventing damage to 10 V-rated op-amps and ADCs. |
Use Scenario: Stabilizing reference voltage for 24 V digital input isolation circuitry. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 8.2 V bias to optocoupler LED driver stage. Use Value: Maintains ±5% regulation across −40°C to +85°C ambient, ensuring consistent LED forward current and signal integrity. |
| DC-DC Converter Feedback Network | Medical Diagnostic Equipment Power Monitor |
Use Scenario: Setting output voltage in isolated flyback converter using TL431-compatible feedback path. IC Role / Device Role / Timing Role: Secondary-side Zener reference replacing TL431 where cost and size are critical. Use Value: Delivers 8.2 V reference with 45.7 Ω dynamic impedance, enabling <1% output voltage drift under 10–90% load step. |
Use Scenario: Overvoltage detection in battery-backed auxiliary power supply for imaging subsystem. IC Role / Device Role / Timing Role: Fail-safe clamp on 9 V backup rail to prevent capacitor overvoltage during charging faults. Use Value: Activates at 7.79 V with <0.5 μA leakage at 6.5 V, eliminating standby power penalty while guaranteeing shutdown below 10 V. |
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-C8V2LT1G | 250 mW SOT-23 device; ZZT = 30 Ω @ 5 mA; RJA = 350 °C/W; no AEC-Q101 rating | Lower power, smaller footprint; unsuitable for 3 W surge or automotive under-hood use | Select when space-constrained and thermal load <250 mW; verify derating for ambient >70°C |
| SZ1SMB5923BT3G | Identical electrical specs and SMB package; AEC-Q101 qualified with SZ prefix and PPAP documentation | Required for automotive production programs needing certified component traceability and change control | Choose for Tier-1 automotive designs where PPAP submission and AEC-Q101 compliance are mandatory |
Compared with BZX84-C8V2LT1G, 1SMB5923BT3G delivers 12× higher power handling and superior thermal performance; compared with SZ1SMB5923BT3G, it lacks formal automotive qualification but shares identical Zener characteristics and package-making it suitable for industrial or consumer applications where cost sensitivity outweighs certification requirements.
Availability
1SMB5923BT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, DC-DC converter feedback networks, and medical diagnostic equipment requiring stable component supply with full traceability and volume scalability.
Supply support for 1SMB5923BT3G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1SMB59xxBT3G series is part of onsemi's high-reliability Zener regulator portfolio designed for precision voltage reference and transient suppression in harsh-environment applications including automotive power systems and industrial controls.
FAQ
What is the Zener voltage tolerance of the 1SMB5923BT3G?
The 1SMB5923BT3G has a Zener voltage tolerance of ±5%, with a specified range of 7.79 V (min) to 8.61 V (max) at IZT = 3.5 mA and TL = 30°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet and applies to all devices in the 1SMB59xxBT3G series.
Can the 1SMB5923BT3G be used in automotive applications?
The standard 1SMB5923BT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZ1SMB5923BT3G meets AEC-Q101 requirements and supports PPAP documentation. For non-certified automotive subsystems (e.g., cabin infotainment), 1SMB5923BT3G may be used subject to internal qualification-but full compliance requires the SZ-prefix variant.
What is the maximum power dissipation of the 1SMB5923BT3G at 25°C ambient?
The 1SMB5923BT3G has a maximum steady-state power dissipation of 550 mW at TA = 25°C, as stated in the Maximum Ratings table. This value decreases linearly by 4.4 mW/°C above 25°C ambient, reaching 3.0 W only at TL = 75°C with zero lead length-a condition requiring direct heatsinking to the PCB copper plane.
Does the 1SMB5923BT3G have a specified junction-to-ambient thermal resistance?
Yes-the 1SMB5923BT3G has a thermal resistance from junction-to-ambient (RJA) of 226 °C/W, measured on an FR-4 board using the recommended footprint. This value assumes standard JEDEC test conditions and must be used with actual board layout and copper area to estimate real-world junction temperature rise.
What is the reverse leakage current specification for the 1SMB5923BT3G?
The 1SMB5923BT3G specifies a maximum reverse leakage current (IR) of 0.5 μA at VR = 6.5 V, per the Electrical Characteristics table. This low leakage ensures minimal quiescent current draw in voltage reference or clamping circuits operating near but below the Zener knee voltage.
1SMB5923BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 3.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 6.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB5923BT3G FAQ
1.How can I place an order for 1SMB5923BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5923BT3G 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 1SMB5923BT3G reliable?
The price and inventory of 1SMB5923BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5923BT3G is usually 5 days.
3.What payment methods are accepted for 1SMB5923BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5923BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5923BT3G?
1SMB5923BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5923BT3G 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 1SMB5923BT3G?
For technical support, including 1SMB5923BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5923BT3G requirements.
6.How does Aetrix verify that 1SMB5923BT3G is sourced from the original manufacturer or authorized distributors?
All 1SMB5923BT3G 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 1SMB5923BT3G meets industry standards.
7.What is the process for return or replacement of 1SMB5923BT3G?
All 1SMB5923BT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5923BT3G, 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 1SMB5923BT3G part is unused and in its original packaging.
Return procedure for 1SMB5923BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5923BT3G Tags
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