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onsemi SZ1SMA5934BT3G
- Part No.:
- SZ1SMA5934BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5934BT3G.pdf
- Description:
- DIODE ZENER 24V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:1,129
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Product details
Overview
SZ1SMA5934BT3G 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 operates across −65 °C to +150 °C and is AEC−Q101 qualified for automotive power rail regulation and overvoltage clamping.
For engineers reviewing the SZ1SMA5934BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal resistance (250 °C/W at TA = 25 °C), low-profile SMA package compatibility, and Class 3 ESD rating (>16 kV HBM).
Technical Context
This device functions as a precision voltage reference and transient clamp in DC power rails. Its 24 V nominal breakdown is specified at IZT = 19 mA with guaranteed min/max limits of 22.8 V and 25.2 V, and it maintains stable regulation down to IZK = 0.5 mA where dynamic impedance rises to 700 Ω.
The SMA package supports top-slide or bottom-board mounting with flat handling surface and cathode band polarity marking. Thermal derating begins at 25 °C ambient (4.0 mW/°C) and 75 °C lead temperature (20 mW/°C), enabling reliable operation in compact automotive and industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V nominal, 22.8–25.2 V range at IZT = 19 mA - defines regulated output voltage under standard bias |
| Power Dissipation (PD) | 0.5 W at TA = 25 °C - sets maximum continuous power in still-air conditions |
| Zener Impedance (ZZT) | 15.6 Ω max at IZT = 19 mA - determines voltage regulation stiffness under load variation |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 18.2 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RJA) | 250 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design margin |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in automated SMT lines without special ESD controls |
| Operating Temperature | −65 °C to +150 °C - supports under-hood automotive and industrial environments |
Pinout & Package
The SZ1SMA5934BT3G uses the SMA (DO-214AC) package, case 403D, with molded cathode band polarity marking and void-free transfer-molded plastic construction rated UL 94 V−0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Zener anode connection point | Connected to higher-potential rail; reverse-biased operation requires this terminal at more positive voltage than anode |
| Anode | Zener cathode connection point | Typically tied to ground or lower-potential reference; completes reverse-bias path for regulation/clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated for automotive power systems requiring PPAP documentation and zero-defect reliability |
| ±5% zener voltage tolerance | Guaranteed 22.8–25.2 V range eliminates need for post-production trimming in most 24 V supply designs |
| Low-profile SMA package | Enables board space savings vs. MELF and compatibility with standard SMT pick-and-place equipment |
| 16 kV HBM ESD rating | Reduces risk of field failure during handling and assembly without additional protection circuitry |
| Pb−Free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping 24 V CAN bus power rail transients induced by load dump or relay switching. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursions above 25.2 V. Use Value: Prevents damage to downstream CAN transceivers and microcontrollers by clamping spikes within AEC-Q100 stress limits. | Use Scenario: Protecting 24 V digital input channels from ESD and surge events in factory automation I/O modules. IC Role / Device Role / Timing Role: Standby shunt regulator that conducts only during overvoltage events >25.2 V. Use Value: Eliminates need for external TVS diodes in cost-sensitive PLC designs while maintaining IEC 61000-4-2 Level 4 compliance. |
| Medical Power Supply Reference | Telecom DC-DC Converter Feedback |
Use Scenario: Providing stable 24 V reference for isolated auxiliary supplies in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Precision voltage reference in feedback divider network of flyback controller. Use Value: ±5% tolerance and low tempco (<10 mV/°C above 12 V) ensure <±2% output regulation over −25 °C to +70 °C. | Use Scenario: Regulating 24 V intermediate bus in telecom base station power architecture. IC Role / Device Role / Timing Role: Shunt regulator maintaining tight voltage window during light-load conditions. Use Value: 15.6 Ω ZZT minimizes output deviation under dynamic load steps, improving PSRR of downstream POL converters. |
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-C24LT1G | 0.3 W rating, SOT-23 package, 24 V ±5%, ZZT = 80 Ω @ 5 mA | Lower power handling; suited for signal-level biasing, not 24 V rail clamping | Select when board space is constrained and dissipation remains <300 mW |
| 1N4749A | 1 W rating, DO-41 through-hole, 24 V ±5%, ZZT = 17 Ω @ 10 mA | Requires manual insertion or wave soldering; lacks AEC-Q101 qualification | Select for legacy through-hole designs or non-automotive cost-sensitive applications |
Compared with BZX84-C24LT1G and 1N4749A, the SZ1SMA5934BT3G delivers higher power capability (1.5 W), automotive qualification, and superior thermal performance in surface-mount layouts-making it optimal for modern 24 V embedded systems requiring reliability and manufacturability.
Availability
SZ1SMA5934BT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection circuits, and medical power supply references requiring stable component supply and full traceability.
Supply support for SZ1SMA5934BT3G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMA59xxBT3G/SZ1SMA59xxBT3G series was designed specifically for surface-mount voltage regulation and transient suppression in space-constrained, high-reliability 24 V systems-including automotive ECUs and industrial controllers.
FAQ
What is the exact zener voltage tolerance for SZ1SMA5934BT3G?
The SZ1SMA5934BT3G has a guaranteed zener voltage range of 22.8 V to 25.2 V at IZT = 19 mA, corresponding to a ±5% tolerance about the nominal 24 V value. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet and applies under thermal equilibrium conditions.
Is SZ1SMA5934BT3G suitable for automotive applications?
Yes, SZ1SMA5934BT3G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its −65 °C to +150 °C operating range and 16 kV HBM ESD rating further validate its suitability for under-hood and chassis-mounted automotive systems.
What is the maximum DC zener current (IZM) for SZ1SMA5934BT3G?
The maximum DC zener current IZM for SZ1SMA5934BT3G is 63 mA, calculated from PD = 0.5 W at TA = 25 °C and VZ = 24 V (IZM = PD/VZ). This value is consistent with the "IZM" column in the Electrical Characteristics table and reflects safe continuous conduction without exceeding thermal limits.
Does SZ1SMA5934BT3G have a defined forward voltage specification?
Yes, SZ1SMA5934BT3G specifies a maximum forward voltage VF of 1.2 V at forward current IF = 200 mA, as stated in the Electrical Characteristics summary on page 2 of the datasheet. This parameter is relevant for applications where the device may conduct in forward bias during fault conditions or startup sequencing.
What package type does SZ1SMA5934BT3G use, and what are its key mechanical features?
SZ1SMA5934BT3G uses the SMA (DO-214AC) package, case 403D, with flat handling surface for accurate placement, low-profile construction, and cathode band polarity marking. It is void-free transfer-molded plastic rated UL 94 V−0, supports top-slide or bottom-board mounting, and has a maximum soldering temperature of 260 °C for 10 seconds.
SZ1SMA5934BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZ1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SZ1SMA5934BT3G FAQ
1.How can I place an order for SZ1SMA5934BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5934BT3G 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 SZ1SMA5934BT3G reliable?
The price and inventory of SZ1SMA5934BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5934BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5934BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5934BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5934BT3G?
SZ1SMA5934BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5934BT3G 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 SZ1SMA5934BT3G?
For technical support, including SZ1SMA5934BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5934BT3G requirements.
6.How does Aetrix verify that SZ1SMA5934BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5934BT3G 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 SZ1SMA5934BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5934BT3G?
All SZ1SMA5934BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5934BT3G, 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 SZ1SMA5934BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5934BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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