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onsemi SZ1SMA5917BT3G
- Part No.:
- SZ1SMA5917BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5917BT3G.pdf
- Description:
- DIODE ZENER 4.7V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,012
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Product details
Overview
SZ1SMA5917BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal reverse breakdown voltage of 4.7 V, maximum zener impedance of 79.8 Ω at 5.0 mA test current, and leakage current ≤2.5 μA at 1.5 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power power supply regulation and signal conditioning circuits.
For engineers reviewing the SZ1SMA5917BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, ±5% voltage tolerance, 1.5 W power rating at TL = 75°C, and SMA package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage regulator using avalanche breakdown in silicon PN junction. Its thermal resistance from junction-to-lead is 50 °C/W, enabling stable operation up to +150°C junction temperature when mounted on a 1 in² copper pad. The cathode is marked by a molded band, confirming unidirectional conduction.
Zener voltage is specified at IZT = 5.0 mA with min/typ/max values of 4.46 V / 4.7 V / 4.94 V. Dynamic impedance is measured at both IZT (79.8 Ω) and IZK (500 Ω), supporting design of low-noise references and transient clamping circuits requiring predictable knee behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal; tight ±5% tolerance ensures predictable clamping threshold in voltage reference designs |
| Power Dissipation (PD) | 1.5 W at TL = 75°C; derates linearly above 75°C for thermal-aware PCB layout |
| Zener Impedance (ZZT) | 79.8 Ω at IZT = 5.0 mA; defines AC regulation error under dynamic load conditions |
| Leakage Current (IR) | ≤2.5 μA at VR = 1.5 V; enables low-quiescent-current biasing in battery-powered systems |
| Max DC Zener Current (IZM) | 319 mA; sets absolute upper limit for continuous current handling without thermal runaway |
| ESD Rating | Class 3 (>16 kV HBM); supports robust handling in automated manufacturing and field-deployed electronics |
| Operating Temp Range | −65°C to +150°C; qualified for automotive under-hood and industrial control environments |
Pinout & Package
The SZ1SMA5917BT3G uses the SMA (DO-214AC) surface-mount package per case outline 403D, with flat handling surface for accurate placement and UL 94 V-0 flammability rating. Cathode is identified by a molded polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band End) | Reverse-biased terminal | Connected to higher potential node during regulation; carries full zener current in clamp mode |
| Anode | Forward-biased terminal | Typically grounded or connected to lower potential; establishes reference point for voltage stabilization |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles |
| Low-profile SMA package | Enables high-density PCB layouts and replaces MELF diodes without footprint redesign |
| Flat handling surface | Improves pick-and-place accuracy and reduces tombstoning risk during reflow soldering |
| Top-slide or bottom-mount capability | Supports dual-side assembly and flexible board stacking configurations |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring door lock status and window position sensors. IC Role / Device Role / Timing Role: Zener diode provides stable 4.7 V reference independent of battery voltage fluctuations between 9–16 V. Use Value: Enables consistent 12-bit ADC resolution across operating temperature range (−40°C to +125°C) without external voltage reference IC. | Use Scenario: Clamping analog output of 4–20 mA current-loop transmitters to protect downstream op-amps from overvoltage events. IC Role / Device Role / Timing Role: Acts as passive shunt limiter, conducting only when loop voltage exceeds 4.94 V. Use Value: Prevents op-amp input stage damage while maintaining <2.5 μA leakage to avoid loading the current loop below 4 mA. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Biasing |
Use Scenario: Providing feedback voltage to optocoupler-based secondary-side regulation in 5 V/2 A wall adapters. IC Role / Device Role / Timing Role: Sets precise 4.7 V threshold triggering optocoupler LED drive current in flyback controller feedback path. Use Value: Achieves ±3% output voltage regulation across line/load/temperature without TL431 or digital compensation. | Use Scenario: Generating stable bias for photodiode amplifier stages in portable pulse oximeters. IC Role / Device Role / Timing Role: Supplies low-noise 4.7 V reference to op-amp non-inverting input in transimpedance configuration. Use Value: Maintains <10 ppm/°C drift contribution to total system offset, meeting IEC 60601-1 leakage current limits. |
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-C4V7 | 300 mW rating, SOT-23 package, 400 Ω ZZT at 5 mA | Lower power handling; suitable only for signal-level clamping, not power rail regulation | Select when board space is constrained and dissipation remains <300 mW |
| MMSZ4704T1G | 500 mW rating, SOD-123 package, 90 Ω ZZT at 10 mA | Higher test current requirement; less stable regulation at low currents (<1 mA) | Select when cost sensitivity outweighs thermal margin and AEC-Q101 requirement |
Compared with BZX84-C4V7 and MMSZ4704T1G, the SZ1SMA5917BT3G delivers 3× higher power capability, lower dynamic impedance at low test current, and automotive-grade reliability-making it the preferred choice for primary voltage regulation in harsh-environment embedded systems.
Availability
SZ1SMA5917BT3G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for SZ1SMA5917BT3G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMA59xxBT3G/SZ1SMA59xxBT3G series was engineered specifically for surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding environments where reliability and consistency are critical.
FAQ
What is the exact Zener voltage tolerance for SZ1SMA5917BT3G?
The SZ1SMA5917BT3G has a guaranteed Zener voltage tolerance of ±5% at IZT = 5.0 mA, with minimum, nominal, and maximum values of 4.46 V, 4.7 V, and 4.94 V respectively. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet and applies across the full operating temperature range of −65°C to +150°C.
Is SZ1SMA5917BT3G suitable for automotive applications?
Yes, the SZ1SMA5917BT3G is AEC-Q101 qualified and PPAP capable, explicitly designated for automotive use via the "SZ" prefix. It meets stringent requirements for temperature cycling, humidity resistance, and mechanical shock, making it appropriate for under-hood and cabin modules such as lighting controllers and HVAC actuators where the SZ1SMA5917BT3G operates reliably from −40°C to +125°C ambient.
What is the maximum continuous Zener current for SZ1SMA5917BT3G?
The maximum DC Zener current (IZM) for SZ1SMA5917BT3G is 319 mA, calculated from its 1.5 W power rating and nominal 4.7 V Zener voltage. This value assumes thermal equilibrium at lead temperature TL = 75°C with zero lead length on FR-4 board; actual usable current must be reduced if board thermal management is suboptimal or ambient temperature exceeds 25°C.
Does SZ1SMA5917BT3G have Pb-free construction?
Yes, SZ1SMA5917BT3G is Pb-free and complies with RoHS Directive 2011/65/EU. The "G" suffix in the part number explicitly denotes Pb-free packaging, and the device is compatible with standard lead-free reflow profiles per JEDEC J-STD-020. All external surfaces are corrosion resistant and readily solderable, with maximum soldering temperature of 260°C for 10 seconds.
How is polarity identified on SZ1SMA5917BT3G?
Polarity on SZ1SMA5917BT3G is indicated by a molded cathode band on the SMA package body, per case outline 403D Style 1. The cathode terminal corresponds to the banded end, and the anode is the opposite end. This marking is visible under standard optical inspection and aligns with IPC-A-610 Class 2/3 requirements for polarity verification during automated optical inspection (AOI) and manual assembly.
SZ1SMA5917BT3G 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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 2.5 µA @ 1.5 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
SZ1SMA5917BT3G FAQ
1.How can I place an order for SZ1SMA5917BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5917BT3G 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 SZ1SMA5917BT3G reliable?
The price and inventory of SZ1SMA5917BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5917BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5917BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5917BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5917BT3G?
SZ1SMA5917BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5917BT3G 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 SZ1SMA5917BT3G?
For technical support, including SZ1SMA5917BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5917BT3G requirements.
6.How does Aetrix verify that SZ1SMA5917BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5917BT3G 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 SZ1SMA5917BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5917BT3G?
All SZ1SMA5917BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5917BT3G, 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 SZ1SMA5917BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5917BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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