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onsemi 1N5921BRL
- Part No.:
- 1N5921BRL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5921BRL.pdf
- Description:
- DIODE ZENER 6.8V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,570
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Product details
Overview
1N5921BRL from onsemi is a 3 W, 6.8 V ±5% Zener diode in DO-41 (Case 59) axial-leaded plastic package, designed for precision voltage regulation and transient suppression in power supply feedback loops, reference circuits, and overvoltage protection. It delivers 5.2 A maximum DC zener current, 55.1 Ω max zener impedance at 2.5 mA test current, and supports surge power up to 98 W for 1 ms.
For engineers reviewing the 1N5921BRL datasheet, pinout, applications, or equivalent options, key selection criteria include its tight ±5% tolerance, Class 3 ESD rating (>16 kV HBM), low leakage (<5 µA @ 5.2 V), thermal stability across −65°C to +200°C, and Pb-free tape-and-reel packaging for automated assembly.
Technical Context
This device uses silicon-oxide passivated junction technology to achieve stable reverse breakdown characteristics with minimal voltage drift under varying temperature and current conditions. Its 3 W steady-state dissipation at 75°C lead temperature and 1 W at 50°C ambient enables robust operation in compact, unheatsinked designs.
The 1N5921BRL exhibits a nominal zener voltage of 6.8 V measured at 2.5 mA (IZT), with guaranteed min/max limits of 6.46 V and 7.14 V. Its low dynamic impedance (55.1 Ω @ IZT) and low leakage current (≤5 µA @ VR = 5.2 V) support high-accuracy regulation in low-power analog references and feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V nominal, 6.46–7.14 V range at IZT = 2.5 mA - ensures precise, production-tested regulation tolerance for feedback and reference use. |
| Power Dissipation | 3 W at TL = 75°C (3/8″ lead length) - supports continuous operation in moderate-temperature environments without heatsinking. |
| Zener Impedance | 55.1 Ω max @ IZT = 2.5 mA - maintains low output impedance for stable regulation under small-signal load variations. |
| Reverse Leakage | ≤5 µA @ VR = 5.2 V - minimizes error current in high-impedance reference paths and improves accuracy in battery-powered systems. |
| Surge Rating | 98 W @ 1 ms non-repetitive - provides reliable transient clamping during line surges or inductive kick events. |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robust handling and board-level reliability in manufacturing and end-use environments. |
| Operating Temp | −65°C to +200°C junction/storage - enables deployment in automotive under-hood, industrial control, and aerospace applications. |
Pinout & Package
Package: DO-41 (Case 59), axial-leaded, transfer-molded thermosetting plastic; cathode indicated by band; lead diameter 0.71–0.86 mm; overall length 25.4 mm min; body diameter 2.00–2.70 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased Zener terminal | Connected to higher-potential node in regulation circuit; carries full zener current during conduction. |
| Anode | Reference/ground terminal | Typically tied to system ground or feedback node; completes reverse-bias path for voltage clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage | ±5% tolerance (B-suffix) - eliminates need for external trimming in mid-accuracy voltage references. |
| High surge capability | 98 W @ 1 ms - protects downstream circuitry from short-duration transients without derating or parallel devices. |
| Low leakage current | ≤5 µA @ 5.2 V - preserves accuracy in high-resistance divider networks and low-quiescent-current designs. |
| Pb-free tape-and-reel | 6000 units/reel (1N5921BRL suffix) - supports automated SMT placement and RoHS-compliant manufacturing. |
| Wide temperature range | −65°C to +200°C operation - qualified for under-hood automotive, downhole, and industrial control environments. |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 12 V/3 A flyback converter to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference sets TL431 cathode bias point; stabilizes regulation setpoint against input line and load variation. Use Value: Tight 6.8 V ±5% tolerance and low 55.1 Ω impedance ensure <±1.5% output voltage drift across temperature and aging. |
Use Scenario: Provides stable 6.8 V reference for 16-bit ADC front-end in factory-floor pressure sensor module. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) Zener establishes precision bias for instrumentation amplifier gain-setting network. Use Value: Minimal leakage current prevents offset error accumulation in high-impedance 1 MΩ gain resistor chain. |
| Overvoltage Clamp for MCU I/O | Automotive Body Control Module |
|
Use Scenario: Placed between 5 V rail and GPIO pin of STM32 microcontroller to protect against ESD and bus faults. IC Role / Device Role / Timing Role: Fast-clamping Zener shunts transient energy before internal protection diodes activate. Use Value: Class 3 ESD rating (>16 kV HBM) and 98 W surge capability meet ISO 10605 requirements without additional TVS. |
Use Scenario: Regulates 6.8 V supply for LIN transceiver and EEPROM in door module operating at 125°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for local LDO input stage; withstands under-hood thermal cycling. Use Value: −65°C to +200°C rating and 3 W dissipation allow direct mounting on PCB without heatsink in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5226B (ON Semiconductor) | 500 mW rating, 3.3 V nominal, DO-35 package - lower power, smaller footprint, different voltage grade. | Suitable for low-power logic-level clamping or biasing where 3 W dissipation is unnecessary. | Select when board space is critical and power demand ≤0.5 W; not interchangeable due to voltage and power mismatch. |
| BZX55C6V8 (Vishay) | 500 mW rating, 6.8 V ±5%, DO-35 - same nominal voltage but lower power and different thermal profile. | Used in consumer electronics reference circuits where surge immunity and high-temp operation are secondary. | Choose for cost-sensitive, low-stress applications; avoid where 98 W surge or −65°C to +200°C operation is required. |
Compared with 1N5921BRL, both alternatives offer matching 6.8 V nominal zener voltage but lack its 3 W continuous rating, 98 W surge capacity, and extended temperature range - making them unsuitable for industrial or automotive power regulation where thermal and transient robustness are essential.
Availability
1N5921BRL is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, overvoltage protection circuits, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for 1N5921BRL 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 focused on energy-efficient electronics, delivering high-performance analog, power management, and signal processing solutions.
The 1N59xxB series is part of onsemi's legacy Zener regulator portfolio, engineered for high-reliability voltage reference and clamping in power conversion, industrial control, and automotive systems.
FAQ
What is the zener voltage tolerance of the 1N5921BRL?
The 1N5921BRL has a ±5% zener voltage tolerance, confirmed by the "B" suffix per onsemi's ordering nomenclature. Its guaranteed breakdown range is 6.46 V to 7.14 V at 2.5 mA test current (IZT), measured with lead temperature maintained at 30°C ±1°C. This tolerance is production-tested and guaranteed across the full operating temperature range.
Can the 1N5921BRL be used in surface-mount designs?
No - the 1N5921BRL is an axial-leaded DO-41 (Case 59) device intended for through-hole mounting. It is not compatible with SMT reflow processes. For surface-mount equivalents, consider onsemi's NSZ series or Vishay's MM3Z6V8, which offer similar 6.8 V regulation in SOD-123 packages - but note differences in power rating, thermal performance, and surge capability versus the 1N5921BRL.
What is the maximum DC zener current for the 1N5921BRL?
The 1N5921BRL supports a maximum DC zener current (IZM) of 5.2 A, derived from its 3 W power rating and nominal 6.8 V zener voltage (IZM = PD / VZ ≈ 3 W / 6.8 V). This value is validated under steady-state conditions at TL = 75°C with 3/8″ lead length, and must be derated linearly above that temperature per the datasheet's derating curve.
Does the 1N5921BRL have a specified temperature coefficient?
Yes - the 1N5921BRL (6.8 V nominal) exhibits a typical zener voltage temperature coefficient of approximately +2.5 mV/°C near room temperature, based on Figure 5 of the onsemi datasheet. This positive coefficient means its regulated voltage increases slightly with rising junction temperature, a characteristic critical for predicting regulation drift in thermally demanding applications.
Is the 1N5921BRL RoHS compliant and halogen-free?
Yes - the "RL" suffix in 1N5921BRL denotes Pb-free tape-and-reel packaging, and the device complies with RoHS Directive 2011/65/EU. onsemi confirms this variant is also halogen-free per IEC 61249-2-21, with chlorine and bromine content below 900 ppm each, as documented in their material declarations and compliance reports.
1N5921BRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 5.2 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
1N5921BRL FAQ
1.How can I place an order for 1N5921BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5921BRL 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 1N5921BRL reliable?
The price and inventory of 1N5921BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5921BRL is usually 5 days.
3.What payment methods are accepted for 1N5921BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5921BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5921BRL?
1N5921BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5921BRL 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 1N5921BRL?
For technical support, including 1N5921BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5921BRL requirements.
6.How does Aetrix verify that 1N5921BRL is sourced from the original manufacturer or authorized distributors?
All 1N5921BRL 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 1N5921BRL meets industry standards.
7.What is the process for return or replacement of 1N5921BRL?
All 1N5921BRL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5921BRL, 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 1N5921BRL part is unused and in its original packaging.
Return procedure for 1N5921BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5921BRL Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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