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Diodes Incorporated ZSR900CL
- Part No.:
- ZSR900CL
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZSR900CL.pdf
- Description:
- IC REG LINEAR 9V 200MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,267
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Product details
Overview
ZSR900CL from Zetex Semiconductors is a fixed 9.0 V positive linear voltage regulator in SOT223 package, designed for local regulation in space-constrained PCBs. It delivers up to 200 mA output current with ±2.5% initial output voltage tolerance (8.775–9.225 V), 350 µA typical quiescent current, and operates across –55°C to +125°C. Used in industrial sensor nodes and embedded microcontroller power rails where low-noise, self-contained regulation is required.
For engineers reviewing the ZSR900CL datasheet, ZSR900CL pinout, ZSR900CL application, or ZSR900CL equivalent, this page provides verified electrical parameters, thermal behavior, real-world load/line regulation performance, and direct-fit alternatives for legacy design support and obsolescence mitigation.
Technical Context
The ZSR900CL employs a monolithic bipolar architecture with internal current limiting and thermal shutdown circuitry-no external compensation or bypass capacitors required for stability. Its dropout voltage remains ≤1.0 V at 200 mA over temperature, enabling operation from 11 V minimum input under full load.
It achieves 43–57 dB ripple rejection at 120 Hz (Vin=12–18 V), 150 µVrms output noise (10 Hz–10 Hz), and exhibits a temperature coefficient of 0.25 mV/°C-critical for precision analog subsystems in wide-temperature environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 9.0 V nominal, 8.775–9.225 V (±2.5%) at 1–200 mA load and –55°C to +125°C - ensures stable MCU core voltage under varying thermal and load conditions. |
| Input Voltage Range | 11–20 V - minimum 11 V required to maintain regulation at 200 mA; supports common 12 V rail systems with margin. |
| Quiescent Current | 350–600 µA - enables ultra-low standby power in battery-backed or energy-sensitive applications. |
| Load Regulation | ≤30 mV (1–200 mA) - maintains tight output accuracy despite dynamic current draw from digital loads. |
| Ripple Rejection | 43–57 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the 12 V bus. |
| Thermal Shutdown Threshold | Internally set - protects against sustained overload or poor heatsinking without external sensing circuitry. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive, industrial control, and outdoor telecom equipment. |
Pinout & Package
Package: SOT223 (4-pin, high-power surface-mount). Pin 4 is internally connected to Pin 2 (GND) or may be left electrically isolated per layout requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 11–20 V unregulated input; requires local 1 µF ceramic capacitor for transient immunity. |
| 2 (GND) | Ground reference | Main thermal and signal return path; connects to large copper pour for heat dissipation. |
| 3 (OUT) | Regulated output | Delivers stable 9.0 V to load; no external feedback or compensation needed. |
| 4 (GND) | Secondary ground terminal | Optional thermal enhancement pad; must be tied to PCB ground plane or left floating-no functional difference. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Internally compensated-eliminates risk of instability from incorrect capacitor selection or PCB parasitics. |
| Internal short-circuit current limit | Peak output current drops to safe level during fault; prevents damage without external foldback circuitry. |
| Thermal shutdown protection | Automatically disables output above junction temperature threshold; recovers autonomously after cooldown. |
| Tight initial voltage tolerance | ±2.5% ensures first-pass system validation without post-production trimming or calibration. |
| Low output noise | 150 µVrms (10 Hz–10 Hz) minimizes interference in adjacent analog signal chains (e.g., ADC references). |
Applications
| Industrial Sensor Node Power | Microcontroller Core Supply |
|---|---|
|
Use Scenario: Powering 3.3 V or 5 V MCU-based environmental sensors (temperature, humidity, gas) deployed in factory-floor enclosures with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Local 9 V regulator feeding an LDO that generates clean 3.3 V for MCU and analog front-end. Use Value: Eliminates need for remote 9 V supply routing; reduces board area by 40% vs. TO-92 alternatives while maintaining thermal margin. |
Use Scenario: Providing stable 9 V bias to analog peripherals (op-amps, DACs, comparators) on an industrial PLC I/O module. IC Role / Device Role / Timing Role: Precision analog rail generator-rejects ripple from shared 12 V switcher and holds voltage within 30 mV across 1–200 mA load swings. Use Value: Enables 12-bit ADC accuracy without additional filtering; avoids 0.5 LSB error induced by supply variation. |
| Legacy Equipment Replacement | Telecom Line Card Bias |
|
Use Scenario: Direct drop-in replacement for obsolete ZSR900C (TO-92) in field-repair kits for aging test instrumentation. IC Role / Device Role / Timing Role: Pin-compatible upgrade path-same marking (ZSR900), same electrical specs, improved thermal performance in SOT223. Use Value: Restores supply chain continuity without PCB redesign; improves reliability via higher power dissipation (2 W vs. 0.5 W TO-92). |
Use Scenario: Generating auxiliary 9 V rail for line-driver ICs and isolation amplifiers on telecom base station interface cards. IC Role / Device Role / Timing Role: Local regulation stage isolating sensitive analog circuitry from noisy backplane power distribution. Use Value: Achieves >43 dB ripple suppression at 120 Hz-prevents clock jitter in data converters linked to E1/T1 timing recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MC78L09ACLP | TO-92 package, ±4% tolerance, 5.5 mA quiescent current, no thermal shutdown | Limited to lower ambient temps (<85°C); unsuitable for high-reliability or thermally dense layouts | Only for cost-sensitive, low-power, non-automotive designs where thermal margin is guaranteed |
| STMicroelectronics L78L09ACZ | SOT89-3 package, ±4% tolerance, 5.5 mA quiescent current, thermal shutdown included | Higher quiescent draw increases standby power; SOT89 thermal resistance ~100°C/W vs. SOT223's ~60°C/W | Acceptable for moderate-load, medium-temp applications-but not for 200 mA continuous at >70°C ambient |
Compared with ZSR900CL, both alternatives sacrifice initial accuracy (±4% vs. ±2.5%), increase quiescent current by >15×, and offer inferior thermal performance-making them unsuitable for high-density or extended-temperature deployments where ZSR900CL's 350 µA IQ and 2 W SOT223 capability deliver measurable system-level reliability and efficiency gains.
Availability
ZSR900CL is available at Aetrix Electronics and suitable for industrial sensor nodes, legacy equipment repair, telecom line card biasing, and embedded microcontroller power rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZSR900CL 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
Zetex Semiconductors (now part of Diodes Incorporated) was a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified, focused on robust, application-optimized components for industrial and automotive markets.
The ZSR Series was developed specifically for local voltage regulation in thermally demanding, space-constrained environments-emphasizing intrinsic stability, wide temperature operation, and elimination of external components to reduce BOM count and failure modes.
FAQ
Is ZSR900CL still in active production?
No-ZSR900CL is an obsolete part per Zetex Issue 9 datasheet (2007), marked "Obsolete" in ordering tables. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested stock for repair and continuity programs. No new wafer starts are planned, and last-time-buy windows have closed.
Can ZSR900CL replace ZSR900C in existing PCBs?
Yes-ZSR900CL uses the same ZSR900 marking and identical electrical specifications as the TO-92 ZSR900C, but in SOT223. Pin 1 (IN), Pin 2 (GND), and Pin 3 (OUT) match functionally. Pin 4 is GND-connected and may be soldered to ground pour or left unconnected. Layout adaptation is required due to different footprint and thermal pad.
What is the maximum power dissipation of ZSR900CL at 85°C ambient?
At 85°C ambient, derated power dissipation is 1.2 W (calculated from 2 W @ 25°C with linear derating to zero at 125°C). This supports 200 mA output with ≤6 V dropout (e.g., 15 V input → 9 V out = 6 V × 0.2 A = 1.2 W), assuming adequate PCB copper area per datasheet guidelines.
Does ZSR900CL require an input bypass capacitor?
Yes-a minimum 1 µF ceramic capacitor is recommended between IN and GND per Zetex application guidance. This mitigates voltage transients during thermal shutdown events, especially when powered from inductive sources, and prevents input voltage overshoot beyond the 20 V absolute maximum rating.
ZSR900CL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 600 µA
- Current - Supply (Max):
- -
- PSRR:
- 57dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
ZSR900CL FAQ
1.How can I place an order for ZSR900CL through Aetrix?
Please submit a Request for Quotation (RFQ) for ZSR900CL 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 ZSR900CL reliable?
The price and inventory of ZSR900CL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR900CL is usually 5 days.
3.What payment methods are accepted for ZSR900CL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR900CL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZSR900CL?
ZSR900CL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZSR900CL 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 ZSR900CL?
For technical support, including ZSR900CL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR900CL requirements.
6.How does Aetrix verify that ZSR900CL is sourced from the original manufacturer or authorized distributors?
All ZSR900CL 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 ZSR900CL meets industry standards.
7.What is the process for return or replacement of ZSR900CL?
All ZSR900CL units undergo pre-shipment inspection (PSI). If there is an issue with ZSR900CL, 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 ZSR900CL part is unused and in its original packaging.
Return procedure for ZSR900CL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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