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onsemi 1SMB5954BT3
- Part No.:
- 1SMB5954BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5954BT3.pdf
- Description:
- DIODE ZENER 160V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,193
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Product details
Overview
1SMB5954BT3 from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 160 V, ±5% tolerance, maximum Zener impedance of 2.3 Ω at 700 mA test current, and reverse leakage current ≤0.25 μA at 121.6 V. It operates from −65 °C to +150 °C and is used for overvoltage protection and precision voltage reference in DC power supplies.
For engineers reviewing the 1SMB5954BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 160 V nominal Zener voltage, 700 mA maximum Zener test current, 2.3 Ω dynamic impedance at IZT, 3 W steady-state power rating at TL = 75 °C, and SMB (Case 403A) package compatibility with automated SMT assembly.
Technical Context
This device functions as a two-terminal voltage regulation element operating in reverse breakdown. Its Zener voltage is specified at IZT = 700 mA with thermal equilibrium at TL = 30 °C, and it exhibits a positive temperature coefficient above ~6 V - confirmed at 160 V by Figure 4's θVZ ≈ +0.1 mV/°C trend for high-voltage devices.
The SMB package provides top- or bottom-side board mounting capability, modified L-bend leads for enhanced pad contact, and UL 94 V-0 flammability rating. It is rated for 260 °C lead temperature during soldering (10 s), and its junction-to-lead thermal resistance is 40 °C/W, enabling effective heat transfer to the PCB under sustained 3 W dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 152–168 V (±5% tolerance at IZT = 700 mA; defines stable clamping threshold) |
| Max Power Dissipation | 3.0 W at TL = 75 °C (requires heatsinking via PCB copper; derates linearly above 75 °C) |
| Zener Impedance (ZZT) | 2.3 Ω max at IZT = 700 mA (low dynamic resistance ensures tight voltage regulation under load transients) |
| Reverse Leakage Current | ≤0.25 μA at VR = 121.6 V (enables low-power standby operation without significant quiescent loss) |
| Junction-to-Lead RθJL | 40 °C/W (supports thermal design using PCB as heatsink; limits ΔTJL to 120 °C at full 3 W) |
| ESD Rating | Class 3 (>16 kV HBM) (robust handling in automated assembly and field environments) |
| Operating Temperature | −65 °C to +150 °C (suitable for under-hood automotive, industrial power, and outdoor equipment) |
Pinout & Package
SMB (Case 403A) surface-mount plastic package with cathode indicated by polarity band; dimensions: 4.32 mm × 3.56 mm × 2.20 mm (L × W × H); void-free transfer-molded construction; Pb-free (G suffix) and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse bias applied between cathode and anode to activate regulation |
| Cathode | Zener breakdown terminal / voltage clamp output | Marked with band; connected to higher-potential rail; maintains regulated voltage relative to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 3 W steady-state power rating | Enables robust transient suppression in 48 V–400 V DC bus protection without external heatsinks |
| ±5% Zener voltage tolerance | Guarantees predictable clamping level across production lots; eliminates need for post-assembly trimming |
| Modified L-bend leads | Increases solder joint area and mechanical reliability on fine-pitch SMB footprints |
| AEC-Q101 qualified variant available (SZ prefix) | Validated for automotive under-hood applications including engine control and battery management systems |
| UL 94 V-0 flammability rating | Meets safety requirements for enclosed industrial power supplies and telecom infrastructure |
Applications
| Industrial DC Power Supply Protection | Automotive Battery Monitoring Circuit |
|---|---|
|
Use Scenario: Clamps voltage spikes on 120–200 V DC intermediate bus in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Two-terminal passive voltage clamp; absorbs surge energy without active control or timing function. Use Value: Prevents damage to downstream DC-DC converters and microcontrollers during load dump or inductive kick events. |
Use Scenario: Provides reference voltage for analog front-end monitoring of 12 V vehicle battery health under cold-cranking conditions. IC Role / Device Role / Timing Role: Precision Zener reference source; stable 160 V regulation enables accurate scaling of high-side sensing circuitry. Use Value: Maintains measurement accuracy across −40 °C to +125 °C ambient while consuming <1 μA standby current. |
| Telecom Line Card Overvoltage Protection | Renewable Energy Inverter DC Link Clamp |
|
Use Scenario: Protects Ethernet PHY interface ICs from lightning-induced surges on PoE-powered line cards. IC Role / Device Role / Timing Role: Fast-response shunt regulator; activates within nanoseconds upon exceeding 160 V threshold. Use Value: Limits transient voltage to safe levels before TVS diodes reach breakdown, extending system-level ESD lifetime. |
Use Scenario: Suppresses switching transients on 150–180 V DC link of solar microinverters during MOSFET turn-off. IC Role / Device Role / Timing Role: Passive energy-dissipating clamp; works in parallel with snubber networks to reduce dv/dt stress. Use Value: Reduces electromagnetic interference (EMI) and gate driver stress by limiting peak overshoot to ≤168 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 |
|---|---|---|---|
| 1SMB5954BT3G | Pb-free version of same die and package; identical electrical specs; RoHS-compliant finish | No functional difference; required for EU/China RoHS-compliant designs | Select 1SMB5954BT3G when lead-free compliance is mandated; otherwise 1SMB5954BT3 is fully interchangeable |
| SZ1SMB5954BT3G | AEC-Q101 qualified; tighter process controls; PPAP-capable; same Zener parameters and SMB package | Qualified for automotive under-hood use; supports ASIL-B functional safety architectures | Choose SZ1SMB5954BT3G for automotive OEM programs; 1SMB5954BT3 remains suitable for industrial/commercial applications |
Compared with 1SMB5954BT3, the 1SMB5954BT3G offers identical performance with Pb-free termination, while SZ1SMB5954BT3G adds AEC-Q101 qualification and PPAP support - making it the only option approved for automotive safety-critical voltage clamping where traceability and process validation are mandatory.
Availability
1SMB5954BT3 is available at Aetrix Electronics and suitable for industrial DC power supply protection, telecom line card surge suppression, renewable energy inverter DC link clamping, and automotive battery monitoring requiring stable component supply and long-term obsolescence management.
Supply support for 1SMB5954BT3 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMB59xxBT3 series belongs to onsemi's high-power Zener regulator portfolio, designed specifically for robust overvoltage protection and precision voltage reference in harsh-environment power systems where reliability and thermal stability are critical.
FAQ
What is the Zener voltage tolerance of the 1SMB5954BT3?
The 1SMB5954BT3 has a nominal Zener voltage of 160 V with a tolerance of ±5%, meaning its actual measured VZ falls between 152 V and 168 V when tested at IZT = 700 mA and TL = 30 °C. This tolerance is guaranteed across the full operating temperature range and is verified per the manufacturer's production test flow.
Can the 1SMB5954BT3 be used in automotive applications?
The standard 1SMB5954BT3 is not AEC-Q101 qualified; however, the SZ1SMB5954BT3G variant is fully AEC-Q101 qualified and PPAP capable. For automotive under-hood or battery-monitoring applications requiring qualification, engineers must specify SZ1SMB5954BT3G - the 1SMB5954BT3 itself meets all electrical and thermal specs but lacks the automotive process validation.
What is the maximum surge power rating of the 1SMB5954BT3?
The 1SMB5954BT3 supports nonrepetitive peak surge power up to 120 W for 1 ms pulses (per Figure 2), decreasing to ~20 W at 100 ms. This capability is derived from its 3 W steady-state rating and thermal mass, and it enables protection against short-duration transients such as load dump or inductive switching spikes without degradation.
Does the 1SMB5954BT3 have a specified temperature coefficient?
While no single numeric temperature coefficient is published for the 1SMB5954BT3, Figure 4 confirms that devices with VZ ≥ 100 V exhibit a positive temperature coefficient near +0.1 mV/°C. This behavior is consistent across the high-voltage segment of the 1SMB59xxBT3 family and ensures stable clamping voltage under thermal drift in power supply applications.
What is the forward voltage drop of the 1SMB5954BT3?
The 1SMB5954BT3 has a maximum forward voltage (VF) of 1.5 V at IF = 200 mA dc, as specified in the Electrical Characteristics table. This parameter applies only during forward conduction - a condition avoided in normal Zener regulation operation, but relevant for reverse-polarity protection or bidirectional clamp configurations.
1SMB5954BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
1SMB5954BT3 FAQ
1.How can I place an order for 1SMB5954BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5954BT3 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 1SMB5954BT3 reliable?
The price and inventory of 1SMB5954BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5954BT3 is usually 5 days.
3.What payment methods are accepted for 1SMB5954BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5954BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5954BT3?
1SMB5954BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5954BT3 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 1SMB5954BT3?
For technical support, including 1SMB5954BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5954BT3 requirements.
6.How does Aetrix verify that 1SMB5954BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB5954BT3 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 1SMB5954BT3 meets industry standards.
7.What is the process for return or replacement of 1SMB5954BT3?
All 1SMB5954BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5954BT3, 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 1SMB5954BT3 part is unused and in its original packaging.
Return procedure for 1SMB5954BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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