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onsemi 1SMB5952BT3
- Part No.:
- 1SMB5952BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5952BT3.pdf
- Description:
- DIODE ZENER 130V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,266
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Product details
Overview
1SMB5952BT3 from onsemi is a 3 W surface-mount Zener voltage regulator diode with nominal Zener voltage of 130 V, ±5% tolerance, 2.9 mA test current (IZT), and maximum Zener impedance of 5000 Ω at IZT. It operates over −65 °C to +150 °C and is used for precision DC voltage clamping and reference in power supply feedback loops, overvoltage protection circuits, and industrial sensor biasing.
For engineers reviewing the 1SMB5952BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at 130 V, thermal derating above 75 °C, SMB package mechanical compatibility, and compliance with AEC−Q101 requirements for automotive-grade reliability.
Technical Context
This device functions as a two-terminal, unidirectional voltage reference with cathode-anode polarity. Its Zener breakdown mechanism delivers stable reverse conduction at 130 V under 2.9 mA DC test current, with dynamic impedance of 5000 Ω limiting regulation error under load transients.
Thermal design requires junction-to-lead resistance of 40 °C/W and junction-to-ambient resistance of 226 °C/W; power dissipation must be derated linearly above 75 °C (25 mW/°C) or 25 °C (4.4 mW/°C) depending on mounting condition. The SMB package supports top-side or bottom-side PCB mounting with modified L-bend leads for enhanced solder joint reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 123.5 V min / 130 V nom / 136.5 V max - defines clamping threshold with ±5% tolerance at IZT = 2.9 mA |
| Zener Test Current (IZT) | 2.9 mA - sets operating point where VZ and ZZT are specified; impacts thermal stability and noise |
| Zener Impedance (ZZT) | 5000 Ω max @ IZT - determines regulation sensitivity to current variation; higher impedance limits precision |
| Max DC Zener Current (IZM) | 11 A - maximum steady-state reverse current before thermal runaway; sets absolute safe operating limit |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C - usable power handling with zero lead length; derates to 550 mW at TA = 25 °C |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 98.8 V - ensures minimal standby current below knee voltage |
| ESD Rating | Class 3 (>16 kV) HBM - enables robust handling in automated SMT assembly without special ESD controls |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode indicated by polarity band; dimensions: 3.56 mm × 4.32 mm × 2.20 mm (L × W × H); Pb-free (G suffix) variant available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common or low-side reference; forward voltage ≤1.5 V @ 200 mA enables use as clamp or level shifter |
| Cathode | Zener breakdown terminal / Regulated output node | Provides stable 130 V reference when reverse biased; polarity band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| 3 W Power Rating at TL = 75 °C | Enables high-energy transient suppression in compact SMB footprint without heatsink |
| ±5% Zener Voltage Tolerance | Supports tight regulation in feedback networks for switch-mode power supplies requiring <±6.5 V deviation at 130 V |
| AEC−Q101 Qualified (SZ prefix variants) | Validated for automotive under-hood applications including engine control modules and battery management systems |
| Flat Handling Surface | Ensures consistent pick-and-place accuracy during high-speed SMT assembly with no tombstoning risk |
| UL 94 V−0 Flammability Rating | Meets safety standards for enclosed industrial equipment and consumer power adapters |
Applications
| Industrial Power Supply Feedback | Automotive Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference diode providing precise 130 V threshold to trigger TL431 or similar shunt regulator. Use Value: Maintains ±1% output regulation across line/load variations by fixing reference voltage independent of IC supply rail fluctuations. |
Use Scenario: Protecting CAN transceiver inputs against load-dump transients up to 120 V in 12 V automotive systems. IC Role / Device Role / Timing Role: Standby clamping element absorbing surge energy before it reaches sensitive interface ICs. Use Value: Limits peak voltage to 136.5 V (max VZ) with 5000 Ω dynamic impedance, preventing latch-up in ISO1050-level transceivers. |
| High-Voltage Sensor Biasing | Medical Equipment Reference |
Use Scenario: Providing stable bias voltage for photomultiplier tube (PMT) anode chains in radiation detection systems. IC Role / Device Role / Timing Role: Precision DC reference source delivering fixed 130 V to successive dynode stages. Use Value: Enables <0.1% gain stability over temperature due to low Zener voltage drift and 2.9 mA optimal bias point. |
Use Scenario: Generating calibrated reference voltage for analog front-end ADCs in portable ultrasound imaging units. IC Role / Device Role / Timing Role: Low-noise voltage reference establishing full-scale input range for 16-bit SAR ADCs. Use Value: Delivers 130 V ±6.5 V with <100 ppm/°C tempco (per Fig. 4), reducing calibration frequency in field-deployed devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5952B | Same 130 V nominal Zener voltage, but DO-41 through-hole package; 1.5 W rating; no AEC-Q101 qualification | Requires PCB through-hole rework; unsuitable for high-reliability automotive or dense SMT layouts | Select only for legacy board repair or prototyping where manual assembly is acceptable |
| SZ1SMB5952BT3G | Identical electrical specs and SMB package; differs only in SZ prefix indicating AEC-Q101 qualification and PPAP capability | Required for new automotive designs needing certified component traceability and process control | Choose SZ1SMB5952BT3G when automotive PPAP documentation and failure mode analysis are mandatory |
Compared with 1SMB5952BT3, 1N5952B trades surface-mount compatibility and power rating for legacy footprint support, while SZ1SMB5952BT3G adds automotive qualification overhead without altering electrical behavior-making it the drop-in replacement only when certification is contractually required.
Availability
1SMB5952BT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive overvoltage protection circuits, and high-voltage sensor biasing requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.
Supply support for 1SMB5952BT3 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMB59xxBT3 series was designed as a high-power, surface-mount Zener regulator family targeting space-constrained power conversion and protection systems needing reliable 3 W clamping in SMB packages.
FAQ
What is the Zener voltage tolerance of the 1SMB5952BT3?
The 1SMB5952BT3 has a Zener voltage tolerance of ±5%, resulting in a guaranteed range of 123.5 V to 136.5 V at the specified test current of 2.9 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet and applies to all units regardless of manufacturing lot or date code.
Can the 1SMB5952BT3 be used in automotive applications?
The standard 1SMB5952BT3 is not AEC−Q101 qualified; however, its pin-compatible variant SZ1SMB5952BT3G is fully qualified and PPAP capable. For automotive use, engineers must specify the SZ prefix version-1SMB5952BT3 itself meets all electrical and mechanical specs but lacks the required automotive process validation and documentation.
What is the maximum steady-state power dissipation for the 1SMB5952BT3 at room temperature?
At ambient temperature (TA) of 25 °C, the 1SMB5952BT3 has a maximum steady-state power dissipation of 550 mW. This value is derated linearly at 4.4 mW/°C above 25 °C and assumes FR-4 board mounting with recommended footprint per datasheet note 1.
Does the 1SMB5952BT3 have a specified forward voltage?
Yes-the 1SMB5952BT3 has a maximum forward voltage (VF) of 1.5 V at 200 mA DC forward current, as stated in the Electrical Characteristics summary on page 2 of the datasheet. This parameter is consistent across the entire 1SMB59xxBT3 series and verified under TL = 30 °C conditions.
What is the thermal resistance from junction-to-ambient for the 1SMB5952BT3?
The thermal resistance from junction-to-ambient (RJA) for the 1SMB5952BT3 is 226 °C/W under standard FR-4 board conditions with recommended footprint. This value is critical for calculating junction temperature rise and must be used alongside actual power dissipation and ambient temperature to ensure operation within −65 °C to +150 °C limits.
1SMB5952BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 130 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 450 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 98.8 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
1SMB5952BT3 FAQ
1.How can I place an order for 1SMB5952BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5952BT3 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 1SMB5952BT3 reliable?
The price and inventory of 1SMB5952BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5952BT3 is usually 5 days.
3.What payment methods are accepted for 1SMB5952BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5952BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5952BT3?
1SMB5952BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5952BT3 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 1SMB5952BT3?
For technical support, including 1SMB5952BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5952BT3 requirements.
6.How does Aetrix verify that 1SMB5952BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB5952BT3 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 1SMB5952BT3 meets industry standards.
7.What is the process for return or replacement of 1SMB5952BT3?
All 1SMB5952BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5952BT3, 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 1SMB5952BT3 part is unused and in its original packaging.
Return procedure for 1SMB5952BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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