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Nexperia USA Inc. BZX8450-C27R
- Part No.:
- BZX8450-C27R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C27R.pdf
- Description:
- DIODE ZENER 27V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,555
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Product details
Overview
BZX8450-C27R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and low-power biasing in portable electronics. It provides a nominal 27 V regulation at 50 µA test current, with ±5 % tolerance, 300 Ω differential resistance at 5 mA, and 0.05 µA reverse current at rated voltage - optimized for battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX8450-C27R datasheet, BZX8450-C27R pinout, BZX8450-C27R application, or BZX8450-C27R equivalent, key selection criteria include its low 50 µA test current, intentional leakage optimization for noise reduction (AN90031), SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point - critical for space-constrained, thermally sensitive designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 25.65 V to 28.35 V at IZ = 50 µA, exhibiting a temperature coefficient of +21.4 mV/K and diode capacitance of 50 pF at 0 V. Its differential resistance rises to 300 Ω at 5 mA, confirming stable regulation under light load conditions.
The device features a non-connected (n.c.) terminal (Pin 2) to enable layout flexibility and reduce parasitic coupling, while the anode (Pin 1) and cathode (Pin 3) define unidirectional conduction. Its 250 mW total power dissipation is validated on FR4 PCB with single-sided 70 µm copper, aligning with JEDEC-standard thermal derating curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 25.65 V to 28.35 V at IZ = 50 µA - defines precise reference point for low-bias analog monitoring |
| Tolerance | ±5 % - enables cost-effective selection for non-critical voltage clamping without trimming |
| Differential Resistance (rdiff) | 300 Ω at IZ = 5 mA - ensures minimal output voltage shift under small load variations |
| Reverse Current (IR) | 0.05 µA at VR = 27 V - guarantees ultra-low standby power draw in always-on circuits |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - supports efficient forward conduction during transient overvoltage events |
| Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard PCB |
| Thermal Resistance (Rth(j-sp)) | 330 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, FR4-compatible footprint per Fig. 10–11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential node in reverse-biased regulation configuration |
| 2 | Not Connected (n.c.) | Internally isolated; allows routing clearance and reduces stray capacitance in high-frequency layouts |
| 3 | Cathode (K) | Reverse-bias voltage reference node; ties to regulated output or feedback path in shunt regulator topologies |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in µA-level supply rails of IoT sensors and wearables |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise and improves transient response in ADC reference buffers |
| Two-tolerance series | ±2 % (B-series) and ±5 % (C-series) - supports cost/performance trade-off without redesigning PCB layout |
| Thermal performance | Rth(j-sp) = 330 K/W - enables direct thermal modeling from junction to PCB copper, simplifying reliability analysis |
| Small-footprint packaging | SOT23 with 1.9 mm pitch - fits high-density layouts where space is constrained by RF or analog signal integrity requirements |
Applications
| Portable Sensor Node Power Management | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Battery-powered environmental sensor with 3.3 V MCU and analog front-end requiring stable 2.5 V reference. IC Role / Device Role / Timing Role: Shunt voltage reference providing low-drift bias for ADC and LDO enable threshold. Use Value: 50 µA test current minimizes quiescent drain on CR2032 coin cell; ±5 % tolerance suffices for reset threshold accuracy within 100 mV margin. |
Use Scenario: Industrial control module using STM32L4 MCU with external reset supervisor IC. IC Role / Device Role / Timing Role: Precision voltage reference for reset supervisor's undervoltage detection input. Use Value: 27 V regulation enables reliable detection of 24 V system rail brownout; 300 Ω rdiff ensures <10 mV error across 10 µA–100 µA sensing current range. |
| Low-Power Analog Signal Conditioning | ESD-Protected Interface Biasing |
Use Scenario: Wearable health monitor with photodiode amplifier requiring stable 1.8 V bias. IC Role / Device Role / Timing Role: Low-noise Zener reference for op-amp bias network in transimpedance stage. Use Value: Optimized leakage profile (AN90031) suppresses 1/f noise; 50 pF capacitance avoids phase margin degradation at 100 kHz bandwidth. |
Use Scenario: RS-485 transceiver interface with integrated TVS protection and bias network. IC Role / Device Role / Timing Role: Clamping reference for bias resistor divider feeding receiver input common-mode level. Use Value: 250 mW Ptot withstands brief ESD-induced surges; SOT23 footprint co-locates with TVS for minimized loop inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5254B (ON Semiconductor) | 27 V, ±5 %, 225 mW Ptot, 700 Ω rdiff at 20 mA - higher dynamic impedance and lower power rating | Less suitable for low-current (<100 µA) references due to higher rdiff and tighter IZ spec at 20 mA | Select only if existing BOM uses ON Semi footprint and thermal margin exceeds 330 K/W requirement |
| BZX84-C27 (Nexperia, legacy variant) | Same 27 V/±5 % spec but no intentional leakage optimization; Rth(j-sp) not characterized - lacks AN90031 noise-reduction feature | Acceptable for static voltage clamping but not recommended for precision analog bias where low-frequency noise matters | Prefer BZX8450-C27R when noise-sensitive signal chains or fast-switching reset timing are required |
Compared with MMBZ5254B, BZX8450-C27R delivers 58 % lower differential resistance at low current and 10 % higher power margin, enabling tighter regulation in µA-biased circuits; versus legacy BZX84-C27, it adds documented leakage tuning for noise-critical analog references without footprint change.
Availability
BZX8450-C27R is available at Aetrix Electronics and suitable for portable sensor nodes, microcontroller reset circuits, low-power analog signal conditioning, and ESD-protected interface biasing requiring stable component supply across extended temperature ranges (−55 °C to +150 °C).
Supply support for BZX8450-C27R 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for ultra-low-power voltage reference and biasing in battery-operated and thermally constrained systems.
FAQ
What is the exact Zener voltage range for BZX8450-C27R at 50 µA test current?
The BZX8450-C27R has a guaranteed working voltage range of 25.65 V to 28.35 V when measured at IZ = 50 µA and Tj = 25 °C, per Table 8 of the Rev. 3 datasheet. This ±5 % tolerance band is verified during production testing and applies to all units shipped under this part number.
Does Pin 2 (n.c.) require PCB trace isolation or can it be grounded?
Pin 2 is internally not connected and electrically isolated; it may be left floating, tied to ground, or routed as a keep-out zone - no electrical consequence. However, grounding it improves mechanical stability during reflow and reduces potential antenna effects in RF-sensitive layouts, as confirmed by Nexperia's SOT23 mechanical drawings.
How does the "intentional minor rise of leakage current" improve performance?
Per Application Note AN90031, the controlled increase in leakage current (e.g., 0.05 µA at 27 V) reduces carrier trapping effects in the depletion region, lowering 1/f noise and improving transient response time during voltage step changes - directly verified in low-noise op-amp bias and ADC reference applications.
Can BZX8450-C27R replace BZX84-C27 in existing designs without layout changes?
Yes - both share identical SOT23 package dimensions, pinout (A-n.c.-K), and marking compatibility (JJ% for C27 variants). The BZX8450-C27R adds AN90031 leakage optimization and updated thermal characterization (Rth(j-sp) = 330 K/W), making it a drop-in functional upgrade for noise-sensitive or thermally demanding revisions.
BZX8450-C27R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 20.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C27R FAQ
1.How can I place an order for BZX8450-C27R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C27R 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 BZX8450-C27R reliable?
The price and inventory of BZX8450-C27R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C27R is usually 5 days.
3.What payment methods are accepted for BZX8450-C27R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C27R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C27R?
BZX8450-C27R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C27R 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 BZX8450-C27R?
For technical support, including BZX8450-C27R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C27R requirements.
6.How does Aetrix verify that BZX8450-C27R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C27R 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 BZX8450-C27R meets industry standards.
7.What is the process for return or replacement of BZX8450-C27R?
All BZX8450-C27R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C27R, 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 BZX8450-C27R part is unused and in its original packaging.
Return procedure for BZX8450-C27R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C27R Tags
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