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onsemi 1SMB5954BT3G
- Part No.:
- 1SMB5954BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5954BT3G.pdf
- Description:
- DIODE ZENER 160V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,116
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Product details
Overview
1SMB5954BT3G from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 160 V, ±5% tolerance, maximum Zener impedance of 6.7 Ω at 700 mA test current, and reverse leakage current ≤0.25 μA at 121.6 V, designed for precision voltage regulation and overvoltage protection in DC power supplies.
For engineers reviewing the 1SMB5954BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 160 V nominal breakdown voltage, 700 mA maximum Zener test current, 6.7 Ω dynamic impedance at IZT, thermal resistance of 226 °C/W (junction-to-ambient), and SMB package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable reverse-biased conduction above its specified Zener voltage threshold. It exhibits a positive temperature coefficient above ~5 V, with typical θVZ ≈ +0.1 mV/°C for 160 V devices per Figure 4.
The 1SMB5954BT3G delivers regulated clamping under transient overvoltage conditions, supported by 3 W steady-state dissipation at TL = 75°C and peak surge capability up to 1.2 kW for 1 ms pulses (Figure 2). Its flat handling surface and modified L-bend leads ensure reliable placement and solder joint integrity on FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 152–168 V (±5% tolerance; nominal 160 V at IZT = 700 mA) |
| Max Power Dissipation (PD) | 3.0 W at TL = 75°C; derates linearly to 550 mW at TA = 25°C |
| Zener Impedance (ZZT) | 6.7 Ω max at IZT = 700 mA - ensures low regulation error under load variation |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 121.6 V - enables low standby power in high-impedance bias networks |
| Thermal Resistance (RJA) | 226 °C/W - defines junction temperature rise under ambient convection cooling |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated manufacturing environments |
| Operating Temp Range | −65 °C to +150 °C - suitable for automotive under-hood and industrial control applications |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode polarity band; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H); Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential; forms reference return path during Zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail; maintains stable voltage drop across load when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 3 W power rating at lead temperature | Enables sustained clamping in 12–48 V industrial power rails without heatsinking |
| Flat handling surface | Improves pick-and-place accuracy and coplanarity during reflow soldering |
| Modified L-bend leads | Increases solder pad contact area, enhancing mechanical reliability and thermal transfer |
| AEC-Q101 qualified (SZ variant) | Validated for automotive-grade reliability; applicable to 1SMB5954BT3G via family qualification |
| UL 94 V-0 flammability rating | Meets safety standards for enclosed power supply and lighting control enclosures |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Clamping transient spikes on 24 V DC bus lines in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Two-terminal voltage clamp protecting downstream regulators and microcontrollers from load dump events. Use Value: Withstands 1.2 kW non-repetitive surges (Figure 2) and maintains <0.25 μA leakage at 121.6 V, minimizing standby current drain. |
Use Scenario: Overvoltage suppression on LIN bus interface power rails in door modules and seat controllers. IC Role / Device Role / Timing Role: Standby-mode Zener reference providing fail-safe rail stabilization during battery voltage transients. Use Value: AEC-Q101 qualification and −65 °C to +150 °C operation ensure compliance with automotive environmental stress requirements. |
| LED Driver Voltage Reference | Telecom Line Card Surge Protection |
Use Scenario: Precision voltage reference for constant-current LED driver feedback loops in outdoor signage. IC Role / Device Role / Timing Role: Stable 160 V reference source enabling accurate current sensing in high-voltage LED strings. Use Value: Tight ±5% VZ tolerance and 6.7 Ω ZZT minimize regulation drift across temperature and current variations. |
Use Scenario: Primary-stage overvoltage protection on 48 V telecom DC distribution boards. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing lightning-induced surges before reaching sensitive ASICs. Use Value: 3 W steady-state rating and 226 °C/W RJA allow integration into compact board layouts without auxiliary thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5954BRLG | Same 160 V nominal VZ, but DO-41 through-hole package; 1.5 W PD; higher RJA (~500 °C/W) | Requires manual or wave soldering; unsuitable for high-density SMT designs | Select when legacy through-hole assembly or higher surge margin at lower average power is required |
| SZ1SMB5954BT3G | Identical electrical specs and SMB package; AEC-Q101 certified with PPAP documentation support | Required for automotive production programs needing full qualification traceability | Choose for automotive OEM or Tier-1 applications where PPAP compliance and site-controlled change management are mandatory |
Compared with 1SMB5954BT3G, 1N5954BRLG offers mechanical robustness in through-hole form but sacrifices SMT scalability and thermal performance, while SZ1SMB5954BT3G provides identical functionality with certified automotive qualification-making it the preferred choice where process control and supply chain traceability are critical.
Availability
1SMB5954BT3G is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, LED driver voltage reference, and telecom line card surge protection requiring stable component supply and long-term manufacturability.
Supply support for 1SMB5954BT3G 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, and IoT applications.
The 1SMB59xxBT3G series was developed to deliver high-power, surface-mount Zener regulation with enhanced ESD robustness and automotive qualification-targeting next-generation power management in space-constrained, high-reliability systems.
FAQ
What is the nominal Zener voltage and tolerance of the 1SMB5954BT3G?
The 1SMB5954BT3G has a nominal Zener voltage of 160 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 152 V and 168 V when measured at IZT = 700 mA and TL = 30°C. This tight tolerance ensures predictable clamping behavior in precision voltage reference and overvoltage protection circuits using the 1SMB5954BT3G.
Can the 1SMB5954BT3G be used in automotive applications?
Yes-the 1SMB5954BT3G belongs to the AEC-Q101-qualified 1SMB59xxBT3G/SZ1SMB59xxT3G family. While the standard 1SMB5954BT3G variant is not individually certified, its SZ-prefixed counterpart (SZ1SMB5954BT3G) carries full AEC-Q101 qualification and PPAP capability. Engineers may use the 1SMB5954BT3G in automotive prototypes or non-safety-critical subsystems, but must specify SZ1SMB5954BT3G for production-grade automotive applications requiring formal qualification.
What is the maximum Zener test current and corresponding impedance for the 1SMB5954BT3G?
The 1SMB5954BT3G is characterized at a Zener test current (IZT) of 700 mA, where its maximum Zener impedance (ZZT) is specified as 6.7 Ω. This low dynamic impedance ensures minimal voltage deviation under varying load currents, making the 1SMB5954BT3G suitable for applications demanding stable regulation, such as feedback references in high-voltage DC-DC converters.
How does the thermal performance of the 1SMB5954BT3G compare between lead and ambient mounting conditions?
The 1SMB5954BT3G has a thermal resistance of 40 °C/W from junction-to-lead (RJL) and 226 °C/W from junction-to-ambient (RJA). This means that under lead-mounted conditions (e.g., with short traces to copper pour), it can dissipate its full 3.0 W rating at TL = 75°C, whereas in still-air ambient conditions without thermal enhancement, its usable power drops to 550 mW at TA = 25°C. Proper PCB layout is essential to realize the 1SMB5954BT3G's full thermal capability.
Is the 1SMB5954BT3G RoHS-compliant and halogen-free?
Yes-the "G" suffix in 1SMB5954BT3G explicitly denotes a Pb-free, RoHS-compliant construction. The device meets JEDEC JS709C and IPC-1752A requirements for hazardous substances, including full halogen-free status (Cl < 900 ppm, Br < 900 ppm). This compliance is confirmed in onsemi's official packaging and material declarations, ensuring the 1SMB5954BT3G supports environmentally regulated electronics manufacturing.
1SMB5954BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 160 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 700 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 121.6 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
1SMB5954BT3G FAQ
1.How can I place an order for 1SMB5954BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5954BT3G 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 1SMB5954BT3G reliable?
The price and inventory of 1SMB5954BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5954BT3G is usually 5 days.
3.What payment methods are accepted for 1SMB5954BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5954BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5954BT3G?
1SMB5954BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5954BT3G 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 1SMB5954BT3G?
For technical support, including 1SMB5954BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5954BT3G requirements.
6.How does Aetrix verify that 1SMB5954BT3G is sourced from the original manufacturer or authorized distributors?
All 1SMB5954BT3G 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 1SMB5954BT3G meets industry standards.
7.What is the process for return or replacement of 1SMB5954BT3G?
All 1SMB5954BT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5954BT3G, 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 1SMB5954BT3G part is unused and in its original packaging.
Return procedure for 1SMB5954BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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