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onsemi 1N5929B
- Part No.:
- 1N5929B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5929B.pdf
- Description:
- DIODE ZENER 15V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,390
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Product details
Overview
1N5929B from onsemi is a 3 W, ±5% tolerance Zener diode with nominal zener voltage of 15 V, maximum zener impedance of 25 Ω at 9 mA test current, and surge rating of 98 W for 1 ms. It operates across −65 °C to +200 °C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation in industrial control modules.
For engineers reviewing the 1N5929B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DO-41 package details, thermal derating behavior, leakage and impedance specs at defined test conditions, and validated alternative parts for voltage reference and regulation use cases.
Technical Context
The 1N5929B employs a silicon-oxide passivated junction for stable breakdown characteristics and low leakage. Its zener voltage is guaranteed at TL = 30 °C (measured 3/8″ from body), with temperature coefficient of +7.5 mV/°C (typical for 15 V units per Figure 5), and it maintains regulation under steady-state dissipation up to 3 W at TL = 75 °C.
It exhibits 0.25 μA max reverse leakage at VR = 11.4 V, 25 Ω max zener impedance at IZT = 9 mA, and 600 Ω max zener impedance at IZK = 0.25 mA - confirming sharp knee behavior suitable for low-current reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V @ IZT = 9 mA - defines regulated output range for feedback or clamping |
| Zener Impedance (ZZT) | 25 Ω max @ IZT = 9 mA - ensures minimal voltage deviation under load transients |
| Max DC Zener Current (IZM) | 100 mA - sets absolute upper limit for continuous regulation without thermal runaway |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 11.4 V - confirms low standby power loss in high-impedance bias networks |
| Surge Power Rating | 98 W @ 1 ms - supports transient overvoltage suppression in unregulated input stages |
| Steady-State Power Dissipation | 3 W @ TL = 75 °C - requires lead-length-aware thermal design (e.g., 3/8″ leads) |
| Operating Temperature Range | −65 °C to +200 °C - enables deployment in automotive engine compartments and industrial motor drives |
Pinout & Package
Package: DO-41 axial-leaded plastic case (Case 59-10), void-free thermosetting material, cathode indicated by band. Lead temperature tolerance: 260 °C for 10 s at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to higher-potential node in reverse-bias regulation; carries full IZ current during operation |
| Anode | Reference/return terminal | Connected to circuit ground or lower-potential rail; completes current path during zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±5% zener voltage tolerance (B-suffix) | Guarantees tight regulation window (14.25–15.75 V) without post-production trimming |
| ESD rating >16 kV (HBM Class 3) | Enables robust handling and assembly in non-ESD-controlled environments |
| Surge capability: 98 W / 1 ms | Withstands line transients common in AC/DC front-end and relay-coil snubbing |
| Pb-free (G-suffix) DO-41 package | Complies with RoHS while maintaining same footprint and thermal performance as legacy versions |
| 6-parameter electrical guarantee | Ensures VZ, IZT, ZZT, IZK, ZZK, and IR all meet spec - critical for high-reliability designs |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference Voltage |
|---|---|
Use Scenario: Provides stable 15 V reference for optocoupler-based feedback in 24 V input DC/DC converters. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp TL431 cathode voltage and set output regulation point. Use Value: Maintains ±1% output accuracy over temperature due to low ZZT and predictable TC (+7.5 mV/°C). |
Use Scenario: Supplies precise bias voltage to bridge amplifier inputs in pressure transducer signal conditioning circuits. IC Role / Device Role / Timing Role: Low-leakage (0.25 μA) voltage reference establishing common-mode level for instrumentation amplifiers. Use Value: Minimizes offset drift and enables <10 ppm/°C system-level reference stability when combined with matched resistors. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamps 24 V rail surges above 16 V to protect downstream logic and analog ICs in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Fast-response shunt regulator diverting transient energy to ground during ESD or inductive kick events. Use Value: 98 W surge rating absorbs 1 ms transients without degradation, extending system MTBF in electrically noisy environments. |
Use Scenario: Generates clean 15 V reset threshold for 3.3 V microcontrollers via resistor divider and RC delay in embedded telemetry nodes. IC Role / Device Role / Timing Role: Stable voltage reference enabling accurate brown-out detection independent of supply ripple. Use Value: Tight ±5% VZ tolerance ensures consistent reset activation across production batches and temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 14 V nominal, ±5%, 1 W rating, DO-41, ZZT = 17 Ω @ 25 mA | Lower power (1 W) and higher test current - less suitable for sustained 100 mA loads | Select when thermal budget is constrained and peak IZ < 25 mA; verify derating at elevated ambient |
| BZX85C15 | 15 V nominal, ±5%, 1.3 W, DO-41, ZZT = 30 Ω @ 5 mA, IR = 0.5 μA @ 12 V | Higher leakage and lower surge rating (40 W) - reduced robustness in transient-prone systems | Prefer for cost-sensitive consumer applications where 98 W surge immunity is not required |
Compared with 1N5929B, the 1N4744A offers tighter ZZT but lacks 3 W capability and 98 W surge margin, while BZX85C15 matches voltage but trades off reliability in harsh environments - making 1N5929B optimal for industrial-grade regulation where power, surge, and leakage must all be simultaneously optimized.
Availability
1N5929B is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and programmable logic controller (PLC) I/O protection circuits requiring stable component supply, long-term lifecycle support, and traceable Pb-free sourcing.
Supply support for 1N5929B 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, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1N5929B belongs to the 1N5913B Series of 3 W Zener regulators designed specifically for high-reliability voltage reference and clamping in demanding industrial and automotive environments - emphasizing rugged packaging, guaranteed multi-parameter limits, and extended temperature operation.
FAQ
What is the zener voltage tolerance of the 1N5929B?
The 1N5929B has a ±5% zener voltage tolerance, confirmed by the "B" suffix in its part number per onsemi's tolerance designation standard. Its specified range is 14.25 V to 15.75 V at IZT = 9 mA and TL = 30 °C. This tolerance is production-guaranteed and applies across the full operating temperature range, making the 1N5929B suitable for applications requiring predictable regulation without calibration.
How does the 1N5929B handle thermal derating above 75°C?
The 1N5929B derates linearly at 24 mW/°C above TL = 75 °C for lead length = 3/8″, reducing its maximum steady-state power dissipation from 3 W to zero at approximately 187.5 °C. This derating curve is defined in Figure 1 of the datasheet and must be applied when mounting the 1N5929B in enclosed or high-ambient environments - direct PCB copper pour or clip-based heatsinking improves thermal margin.
What is the maximum reverse leakage current for the 1N5929B, and at what voltage is it measured?
The 1N5929B has a maximum reverse leakage current of 0.25 μA, measured at VR = 11.4 V (80% of nominal VZ). This value is guaranteed across temperature and reflects the device's oxide-passivated junction quality. Low leakage ensures minimal error in high-impedance reference dividers and preserves battery life in always-on sensor nodes using the 1N5929B.
Can the 1N5929B be used as a direct replacement for the 1N4744A?
No - the 1N5929B is not a direct replacement for the 1N4744A. While both are DO-41 Zeners with ~15 V rating, the 1N5929B is rated for 3 W continuous power and 98 W surge, whereas the 1N4744A is limited to 1 W and 40 W surge. Substituting the 1N5929B into a 1N4744A design may cause excessive heat without layout revision; substituting the reverse risks catastrophic failure under transient stress. Always validate thermal and surge margins before interchange.
What does the "G" suffix indicate in the 1N5929B ordering code?
The "G" suffix in 1N5929B, G indicates a Pb-free (RoHS-compliant) version of the device, packaged in the standard DO-41 outline with void-free thermosetting plastic. It shares identical electrical specifications, thermal performance, and mechanical dimensions with non-Pb-free variants, and is shipped in 2000-unit boxes. The "G" does not affect zener voltage, impedance, or reliability - only material composition and compliance status.
1N5929B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 11.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5929B FAQ
1.How can I place an order for 1N5929B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5929B 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 1N5929B reliable?
The price and inventory of 1N5929B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5929B is usually 5 days.
3.What payment methods are accepted for 1N5929B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5929B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5929B?
1N5929B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5929B 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 1N5929B?
For technical support, including 1N5929B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5929B requirements.
6.How does Aetrix verify that 1N5929B is sourced from the original manufacturer or authorized distributors?
All 1N5929B 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 1N5929B meets industry standards.
7.What is the process for return or replacement of 1N5929B?
All 1N5929B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5929B, 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 1N5929B part is unused and in its original packaging.
Return procedure for 1N5929B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5929B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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