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onsemi 1SMA5934BT3
- Part No.:
- 1SMA5934BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5934BT3.pdf
- Description:
- DIODE ZENER 24V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,614
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Product details
Overview
1SMA5934BT3 from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 24 V, maximum zener impedance of 15.6 Ω at 19 mA test current, and reverse leakage current ≤0.25 μA at 18.2 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and protection circuits.
For engineers reviewing the 1SMA5934BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5% voltage tolerance, AEC−Q101 qualification (SZ variant), low-profile SMA package, and 16 kV HBM ESD rating - critical for automotive and industrial board-level reliability validation.
Technical Context
This device operates as a two-terminal, unidirectional voltage regulator in reverse-biased mode. Its zener breakdown is specified at IZT = 19 mA with VZ = 22.8–25.2 V, and it maintains stable regulation down to IZK = 0.5 mA where ZZK ≤ 700 Ω.
Thermal design requires attention to derating: PD = 1.5 W at TL = 75°C, dropping linearly at 20 mW/°C above that temperature; junction-to-lead thermal resistance is 50 °C/W, enabling efficient heat transfer to PCB copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V (min) to 25.2 V (max) at IZT = 19 mA - defines regulated output range under standard test conditions |
| Power Dissipation (PD) | 1.5 W @ TL = 75°C - sets maximum steady-state power handling with proper lead heatsinking |
| Zener Impedance (ZZT) | 15.6 Ω max @ IZT = 19 mA - determines regulation stiffness and output voltage variation under load changes |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 18.2 V - ensures minimal standby current in clamping or reference applications |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robust handling in automated SMT assembly and field-replaceable modules |
| Operating Temp | −65°C to +150°C - enables deployment in under-hood automotive, industrial motor drives, and outdoor power electronics |
Pinout & Package
SMA package (Case 403D), surface-mount, low-profile plastic case with molded cathode band. Cathode and anode terminals are accessible on opposite ends of the rectangular body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Regulated output node | Connected to higher-potential rail; voltage referenced to this terminal during reverse conduction |
| Anode | Reference/return node | Typically tied to system ground or lower-potential rail; completes bias path for zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free construction | RoHS-compliant packaging with UL 94 V-0 flammability rating - meets global environmental compliance and safety standards |
| Flat handling surface | Enables high-accuracy pick-and-place placement in automated SMT lines without tombstoning or misalignment |
| AEC−Q101 qualified (SZ variant) | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock - supports Tier-1 BOM inclusion |
| Top-slide or bottom-mount compatible | Package geometry allows flexible board layout - usable in both top-side and underside mounting configurations |
Applications
| Power Supply Overvoltage Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Protects downstream DC-DC converter ICs from transient overvoltage events on 24 V rail systems. IC Role / Device Role / Timing Role: Zener clamping element placed between rail and ground to shunt excess energy when voltage exceeds 25.2 V. Use Value: Limits peak rail voltage to ≤25.2 V with <0.25 μA leakage below clamp threshold - preserves efficiency and avoids false triggering. | Use Scenario: Provides stable 24 V reference for analog front-end circuitry in factory-floor pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and excitation circuitry. Use Value: Delivers ±5% tolerance and <15.6 Ω dynamic impedance - ensures <0.5% reference error across operating temperature range. |
| Automotive Body Control Module | LED Driver Current Regulation |
Use Scenario: Regulates auxiliary 24 V supply in BCM subsystems exposed to load-dump transients. IC Role / Device Role / Timing Role: Primary voltage stabilization component in non-switching LDO-like local regulation stage. Use Value: Withstands −65°C to +150°C ambient and passes AEC−Q101 stress tests - ensures functional safety in engine bay environments. | Use Scenario: Sets constant current for high-brightness LED strings in commercial signage using simple resistor-Zener bias. IC Role / Device Role / Timing Role: Voltage reference in emitter-follower or op-amp current-sense feedback loop. Use Value: 24 V nominal zener point matches common LED string forward voltage - enables accurate 19 mA bias current setting with minimal parts count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | Through-hole DO-41 package; 22 V nominal, ±5% tolerance; 1 W power rating | Not suitable for high-density SMT layouts; lacks AEC−Q101 qualification and 16 kV HBM ESD rating | Select only for legacy through-hole designs or prototyping where thermal margin permits lower power dissipation |
| BZX84-C24 | SOT-23 package; 24 V nominal, ±5%; 300 mW power rating; higher ZZT (~30 Ω) | Lower power handling limits use in >10 mA regulation; unsuitable for sustained 19 mA operation or automotive under-hood temps | Prefer for space-constrained low-power sensor nodes where 300 mW suffices and reflow profile compatibility is verified |
Compared with 1SMA5934BT3, 1N4748A offers identical voltage tolerance but sacrifices SMT compatibility and automotive reliability, while BZX84-C24 reduces footprint at the cost of 80% lower power capacity and degraded regulation stiffness - making 1SMA5934BT3 optimal for 24 V SMT power rail stabilization requiring 1.5 W capability and industrial/automotive robustness.
Availability
1SMA5934BT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and sensor signal conditioning circuits requiring stable component supply and long-term obsolescence management.
Supply support for 1SMA5934BT3 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The 1SMA59xxBT3G series was designed for high-reliability surface-mount voltage regulation in space-constrained, thermally demanding applications - particularly targeting automotive sub-systems and industrial controls needing AEC−Q101 compliance and robust transient immunity.
FAQ
What is the nominal zener voltage of the 1SMA5934BT3?
The 1SMA5934BT3 has a nominal zener voltage of 24 V, with guaranteed minimum and maximum values of 22.8 V and 25.2 V respectively at IZT = 19 mA and TA = 25°C. This ±5% tolerance is marked by the "5934" suffix and applies across the full operating temperature range of −65°C to +150°C.
Is the 1SMA5934BT3 RoHS compliant and Pb-free?
Yes, the 1SMA5934BT3 is Pb-free and RoHS compliant, as indicated by the "G" suffix in its full part number (1SMA5934BT3G). The device uses void-free transfer-molded plastic packaging with UL 94 V-0 flammability rating and solderable leads compatible with standard reflow profiles up to 260°C for 10 seconds.
What is the maximum power dissipation rating for the 1SMA5934BT3?
The 1SMA5934BT3 is rated for 1.5 W DC power dissipation at lead temperature (TL) = 75°C, with linear derating of 20 mW/°C above that temperature. At ambient temperature (TA) = 25°C, the rating drops to 0.5 W due to higher thermal resistance to ambient (250 °C/W).
Does the 1SMA5934BT3 have automotive qualification?
The base 1SMA5934BT3 is not AEC−Q101 qualified; however, its automotive-grade counterpart SZ1SMA5934BT3G is fully AEC−Q101 qualified and PPAP capable. Both share identical electrical specifications and SMA package, differing only in traceability, change control, and qualification documentation.
What is the zener impedance of the 1SMA5934BT3 at its test current?
The 1SMA5934BT3 exhibits a maximum zener impedance (ZZT) of 15.6 Ω at its specified test current IZT = 19 mA. This value reflects dynamic resistance under regulation and directly impacts output voltage stability during load transients in reference or clamp applications.
1SMA5934BT3 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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 18.2 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
1SMA5934BT3 FAQ
1.How can I place an order for 1SMA5934BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5934BT3 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 1SMA5934BT3 reliable?
The price and inventory of 1SMA5934BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5934BT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5934BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5934BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5934BT3?
1SMA5934BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5934BT3 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 1SMA5934BT3?
For technical support, including 1SMA5934BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5934BT3 requirements.
6.How does Aetrix verify that 1SMA5934BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5934BT3 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 1SMA5934BT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5934BT3?
All 1SMA5934BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5934BT3, 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 1SMA5934BT3 part is unused and in its original packaging.
Return procedure for 1SMA5934BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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