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Microchip Technology 1N5238BUR-1/TR
- Part No.:
- 1N5238BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5238BUR-1/TR.pdf
- Description:
- DIODE ZENER 8.7V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,572
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Product details
Overview
1N5238BUR-1/TR from Microsemi is a 0.5 W surface-mount Zener diode with nominal Zener voltage of 8.7 V at 20 mA test current, ±5% tolerance (B suffix), and DO-213AA (SOD-80/MELF) hermetically sealed glass package. It provides stable voltage regulation in power supply reference, overvoltage protection, and biasing circuits across industrial temperature range.
For engineers reviewing the 1N5238BUR-1/TR datasheet, 1N5238BUR-1/TR pinout, 1N5238BUR-1/TR application, or 1N5238BUR-1/TR equivalent, key selection factors include its 8.7 V regulation point, 8.0 Ω dynamic impedance at 20 mA, 3.0 µA max reverse leakage at 6.2 V, +0.065 %/°C temperature coefficient, and suitability for space-constrained SMT designs requiring MIL-PRF-19500 up-screening options.
Technical Context
This Zener operates in reverse breakdown to maintain a stable reference voltage under varying load and temperature conditions. Its metallurgically bonded construction ensures reliability in high-reliability applications, and the DO-213AA package supports automated placement while maintaining hermetic sealing.
Regulation occurs at IZT = 20 mA with VZ = 8.7 V; dynamic impedance ZZT = 8.0 Ω confirms low AC impedance near the knee, and αVZ = +0.065 %/°C indicates predictable positive drift above 25 °C - critical for precision analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V at 20 mA - precise DC reference voltage for feedback loops and voltage clamping |
| Power Dissipation | 0.5 W - limits continuous thermal stress on PCB; requires derating above 50 °C ambient |
| Dynamic Impedance (ZZT) | 8.0 Ω at 20 mA - low AC impedance ensures minimal output voltage variation under ripple current |
| Reverse Leakage (IR) | 3.0 µA max at 6.2 V - negligible standby current in high-impedance bias networks |
| Temp. Coefficient (αVZ) | +0.065 %/°C - predictable positive drift enables compensation in multi-device references |
| Forward Voltage (VF) | 1.1 V max at 200 mA - defines forward conduction threshold for polarity-sensitive protection schemes |
| Junction Temp. Range | -65 to +175 °C - supports operation in extended industrial and aerospace environments |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with axial symmetry and cathode band marking. End-cap terminals provide solderable tin-lead or RoHS-compliant matte-tin plating per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection during reverse bias | Must be held at higher potential than anode to enter breakdown; band identifies polarity for correct orientation |
| Anode (unbanded end) | Zener cathode connection during reverse bias | Reference ground or lower-potential node; reverse current flows from cathode to anode in regulation mode |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded construction | Enhances long-term stability and resistance to thermal cycling fatigue in mission-critical systems |
| Hermetically sealed DO-213AA package | Prevents moisture ingress and contamination, enabling use in harsh or high-humidity environments |
| MIL-PRF-19500 up-screening option | Supports qualification for defense and aerospace programs requiring enhanced reliability screening |
| Low capacitance (typ. <2 pF) | Minimizes signal coupling and phase shift in RF bias and high-speed clamp applications |
| Radiation-hardened per MicroNote 050 | Validated performance in total ionizing dose (TID) environments up to 100 krad(Si) |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete op-amp-based regulators. IC Role / Device Role / Timing Role: Provides fixed reference voltage for error amplifier comparison against output. Use Value: 8.7 V nominal value and +0.065 %/°C tempco enable accurate setpoint control within ±2% over -55 to +125 °C. | Use Scenario: Clamping transient surges on 5–12 V logic rails or sensor inputs. IC Role / Device Role / Timing Role: Shunts excess energy to ground when input exceeds 8.7 V + tolerance. Use Value: 0.5 W power rating and 8.0 Ω ZZT allow safe dissipation of short-duration transients without thermal runaway. |
| Bias Network Stabilization | Temperature-Compensated Reference |
Use Scenario: Setting quiescent operating points in RF amplifier stages or precision analog front-ends. IC Role / Device Role / Timing Role: Supplies stable DC bias voltage independent of supply rail fluctuations. Use Value: Low 3.0 µA leakage at 6.2 V prevents loading of high-impedance bias dividers, preserving accuracy. | Use Scenario: Paired with negative-tempco components (e.g., thermistors or other Zeners) to build zero-drift references. IC Role / Device Role / Timing Role: Contributes predictable +0.065 %/°C drift to offset opposing coefficients. Use Value: Precisely characterized αVZ enables first-order temperature compensation in metrology-grade instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5238B-1/TR | Same electrical specs but in DO-35 (axial-leaded) package; no metallurgical bond; non-hermetic glass | Suitable for prototyping or through-hole assembly; not qualified for MIL-PRF-19500 or radiation environments | Select 1N5238B-1/TR only if board layout mandates axial leads and hermeticity is not required. |
| MMBZ5238B-7-F | SOT-23 package; same 8.7 V/±5%; 225 mW rating; higher ZZT (15 Ω); RoHS-only; no MIL screening path | Designed for ultra-compact consumer electronics; lacks radiation hardness and extended temp capability | Choose MMBZ5238B-7-F only for cost-sensitive, high-volume commercial designs with no reliability or environmental requirements. |
Compared with 1N5238B-1/TR and MMBZ5238B-7-F, the 1N5238BUR-1/TR uniquely combines hermetic DO-213AA packaging, metallurgical bonding, MIL-PRF-19500 up-screening eligibility, and radiation hardness - making it the sole choice for high-integrity SMT voltage references where long-term parametric stability is mandatory.
Availability
1N5238BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace avionics subsystems, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for 1N5238BUR-1/TR 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
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and security-focused analog and mixed-signal solutions.
The 1N52xxBUR-1 series was developed to deliver JEDEC-standard Zener performance in hermetic surface-mount form, targeting defense, space, and industrial systems where reliability under thermal, mechanical, and radiation stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N5238BUR-1/TR?
The "B" suffix in 1N5238BUR-1/TR denotes ±5% Zener voltage tolerance at 20 mA test current. This is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0232-1 datasheet, where 1N5238BUR-1 is explicitly listed with nominal VZ = 8.7 V and tolerance code B. The TR suffix indicates tape-and-reel packaging per EIA-481-B.
Does 1N5238BUR-1/TR support MIL-PRF-19500 screening?
Yes - the "UR" in 1N5238BUR-1/TR indicates metallurgically bonded surface-mount construction, and the datasheet states that up-screening per MIL-PRF-19500 is available for this series. Screening options depend on reliability level suffix (e.g., MQ, MX) and must be specified at order time; standard commercial 1N5238BUR-1/TR is unscreened but qualifies for screening add-ons.
What is the maximum reverse leakage current for 1N5238BUR-1/TR?
The maximum reverse leakage current (IR) for 1N5238BUR-1/TR is 3.0 µA at VR = 6.2 V, as specified in the Electrical Characteristics table on page 3 of the Microsemi datasheet. This value is measured at 25 °C and reflects worst-case leakage under sub-breakdown bias, critical for low-power bias network integrity.
Is 1N5238BUR-1/TR RoHS compliant?
Yes - the "e3" RoHS compliance designation is available for commercial-grade 1N5238BUR-1/TR devices, with annealed matte-tin plating on end caps. Per the datasheet, RoHS versions are offered only in commercial grade (no blank suffix), and the TR packaging format supports automated SMT assembly without lead-free compatibility concerns.
What package type does 1N5238BUR-1/TR use?
1N5238BUR-1/TR uses the DO-213AA package - also known as SOD-80 or MELF - a hermetically sealed cylindrical glass package with metallurgically bonded internal structure. Dimensions are 1.60–1.70 mm diameter (A) and 3.30–3.70 mm length (B), per the Package Dimensions drawing on page 6 of the datasheet.
1N5238BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N5238BUR-1/TR FAQ
1.How can I place an order for 1N5238BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5238BUR-1/TR 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 1N5238BUR-1/TR reliable?
The price and inventory of 1N5238BUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5238BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5238BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5238BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5238BUR-1/TR?
1N5238BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5238BUR-1/TR 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 1N5238BUR-1/TR?
For technical support, including 1N5238BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5238BUR-1/TR requirements.
6.How does Aetrix verify that 1N5238BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5238BUR-1/TR 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 1N5238BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5238BUR-1/TR?
All 1N5238BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5238BUR-1/TR, 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 1N5238BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5238BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5238BUR-1/TR Tags
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